Java最全文件操作实例汇总

本文实例汇总了java文件操作。分享给大家供大家参考，具体如下：

1.创建文件夹

//import java.io.*; 
file myfolderpath = new file(%%1); 
try { 
if (!myfolderpath.exists()) { 
myfolderpath.mkdir(); 
} 
} 
catch (exception e) { 
system.out.println("新建目录操作出错"); 
e.printstacktrace(); 
}

2.创建文件

//import java.io.*; 
file myfilepath = new file(%%1); 
try { 
if (!myfilepath.exists()) { 
myfilepath.createnewfile(); 
} 
filewriter resultfile = new filewriter(myfilepath); 
printwriter myfile = new printwriter(resultfile); 
myfile.println(%%2); 
resultfile.close(); 
} 
catch (exception e) { 
system.out.println("新建文件操作出错"); 
e.printstacktrace(); 
}

3.删除文件

//import java.io.*; 
file mydelfile = new file(%%1); 
try { 
mydelfile.delete(); 
} 
catch (exception e) { 
system.out.println("删除文件操作出错"); 
e.printstacktrace(); 
}

4.删除文件夹

//import java.io.*; 
file delfolderpath = new file(%%1); 
try { 
delfolderpath.delete(); //删除空文件夹 
} 
catch (exception e) { 
system.out.println("删除文件夹操作出错"); 
e.printstacktrace(); 
}

5.删除一个文件下夹所有的文件夹

//import java.io.*; 
file delfile=new file(%%1); 
file[] files=delfile.listfiles(); 
for(int i=0;i<files.length;i++){ 
if(files[i].isdirectory()){ 
files[i].delete(); 
} 
}

6.清空文件夹

//import java.io.*; 
file delfilefolder=new file(%%1); 
try { 
if (!delfilefolder.exists()) { 
delfilefolder.delete(); 
} 
delfilefolder.mkdir(); 
} 
catch (exception e) { 
system.out.println("清空目录操作出错"); 
e.printstacktrace(); 
}

7.读取文件

//import java.io.*; 
// 逐行读取数据 
filereader fr = new filereader(%%1); 
bufferedreader br = new bufferedreader(fr); 
string %%2 = br.readline(); 
while (%%2 != null) { 
%%3 
%%2 = br.readline(); 
} 
br.close(); 
fr.close();

8.写入文件

//import java.io.*; 
// 将数据写入文件 
try { 
filewriter fw = new filewriter(%%1); 
fw.write(%%2); 
fw.flush(); 
fw.close(); 
} catch (ioexception e) { 
e.printstacktrace(); 
}

9.写入随机文件

//import java.io.*; 
try { 
randomacessfile logfile=new randomacessfile(%%1,"rw"); 
long lg=logfile.length(); 
logfile.seek(%%2); 
logfile.writebyte(%%3); 
}catch(ioexception ioe){ 
system.out.println("无法写入文件："+ioe.getmessage()); 
}

10.读取文件属性

//import java.io.*; 
// 文件属性的取得 
file af = new file(%%1); 
if (af.exists()) { 
system.out.println(f.getname() + "的属性如下： 文件长度为：" + f.length()); 
system.out.println(f.isfile() ? "是文件" : "不是文件"); 
system.out.println(f.isdirectory() ? "是目录" : "不是目录"); 
system.out.println(f.canread() ? "可读取" : "不"); 
system.out.println(f.canwrite() ? "是隐藏文件" : ""); 
system.out.println("文件夹的最后修改日期为：" + new date(f.lastmodified())); 
} else { 
system.out.println(f.getname() + "的属性如下："); 
system.out.println(f.isfile() ? "是文件" : "不是文件"); 
system.out.println(f.isdirectory() ? "是目录" : "不是目录"); 
system.out.println(f.canread() ? "可读取" : "不"); 
system.out.println(f.canwrite() ? "是隐藏文件" : ""); 
system.out.println("文件的最后修改日期为：" + new date(f.lastmodified())); 
} 
if(f.canread()){ 
%%2 
} 
if(f.canwrite()){ 
%%3 
}

11.写入属性

//import java.io.*; 
file filereadonly=new file(%%1); 
try { 
boolean b=filereadonly.setreadonly(); 
} 
catch (exception e) { 
system.out.println("拒绝写访问："+e.printstacktrace()); 
}

12.枚举一个文件夹中的所有文件

//import java.io.*; 
//import java.util.*; 
linkedlist<string> folderlist = new linkedlist<string>(); 
folderlist.add(%%1); 
while (folderlist.size() > 0) { 
file file = new file(folderlist.peek()); 
folderlist.removelast(); 
file[] files = file.listfiles(); 
arraylist<file> filelist = new arraylist<file>(); 
for (int i = 0; i < files.length; i++) { 
if (files[i].isdirectory()) { 
folderlist.add(files[i].getpath()); 
} else { 
filelist.add(files[i]); 
} 
} 
for (file f : filelist) { 
%%2=f.getabsolutefile(); 
%%3 
} 
}

13.复制文件夹

//import java.io.*; 
//import java.util.*; 
linkedlist<string> folderlist = new linkedlist<string>(); 
folderlist.add(%%1); 
linkedlist<string> folderlist2 = new linkedlist<string>(); 
folderlist2.add(%%2+ %%1.substring(%%1.lastindexof("//"))); 
while (folderlist.size() > 0) { 
(new file(folderlist2.peek())).mkdirs(); // 如果文件夹不存在 则建立新文件夹 
file folders = new file(folderlist.peek()); 
string[] file = folders.list(); 
file temp = null; 
try { 
for (int i = 0; i < file.length; i++) { 
if (folderlist.peek().endswith(file.separator)) { 
temp = new file(folderlist.peek() + file.separator 
+ file[i]); 
} else { 
temp = new file(folderlist.peek() + file.separator 
+ file[i]); 
} 
if (temp.isfile()) { 
fileinputstream input = new fileinputstream(temp); 
fileoutputstream output = new fileoutputstream( 
folderlist2.peek() + file.separator 
+ (temp.getname()).tostring()); 
byte[] b = new byte[5120]; 
int len; 
while ((len = input.read(b)) != -1) { 
output.write(b, 0, len); 
} 
output.flush(); 
output.close(); 
input.close(); 
} 
if (temp.isdirectory()) {// 如果是子文件夹 
for (file f : temp.listfiles()) { 
if (f.isdirectory()) { 
folderlist.add(f.getpath()); 
folderlist2.add(folderlist2.peek() 
+ file.separator + f.getname());
} 
} 
} 
} 
} catch (exception e) { 
//system.out.println("复制整个文件夹内容操作出错"); 
e.printstacktrace(); 
} 
folderlist.removefirst(); 
folderlist2.removefirst(); 
}

14.复制一个文件夹下所有的文件夹到另一个文件夹下

//import java.io.*; 
//import java.util.*; 
file copyfolders=new file(%%1); 
file[] copyfolderslist=copyfolders.listfiles(); 
for(int k=0;k<copyfolderslist.length;k++){ 
if(copyfolderslist[k].isdirectory()){ 
arraylist<string>folderlist=new arraylist<string>(); 
folderlist.add(copyfolderslist[k].getpath()); 
arraylist<string>folderlist2=new arraylist<string>(); 
folderlist2.add(%%2+"/"+copyfolderslist[k].getname()); 
for(int j=0;j<folderlist.length;j++){ 
(new file(folderlist2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹 
file folders=new file(folderlist.get(j)); 
string[] file=folders.list(); 
file temp=null; 
try { 
for (int i = 0; i < file.length; i++) { 
if(folderlist.get(j).endswith(file.separator)){ 
temp=new file(folderlist.get(j)+"/"+file[i]); 
} 
else{ 
temp=new file(folderlist.get(j)+"/"+file.separator+file[i]); 
} 
fileinputstream input = new fileinputstream(temp); 
if(temp.isfile()){ 
fileinputstream input = new fileinputstream(temp); 
fileoutputstream output = new fileoutputstream(folderlist2.get(j) + "/" + 
(temp.getname()).tostring()); 
byte[] b = new byte[5120]; 
int len; 
while ( (len = input.read(b)) != -1) { 
output.write(b, 0, len); 
} 
output.flush(); 
output.close(); 
input.close(); 
} 
if(temp.isdirectory()){//如果是子文件夹 
folderlist.add(folderlist.get(j)+"/"+file[i]); 
folderlist2.add(folderlist2.get(j)+"/"+file[i]); 
} 
} 
} 
catch (exception e) { 
system.out.println("复制整个文件夹内容操作出错"); 
e.printstacktrace(); 
} 
} 
} 
}

15.移动文件夹

//import java.io.*; 
//import java.util.*; 
linkedlist<string> folderlist = new linkedlist<string>(); 
folderlist.add(%%1); 
linkedlist<string> folderlist2 = new linkedlist<string>(); 
folderlist2.add(%%2 + %%1.substring(%%1.lastindexof("//"))); 
while (folderlist.size() > 0) { 
(new file(folderlist2.peek())).mkdirs(); // 如果文件夹不存在 则建立新文件夹 
file folders = new file(folderlist.peek()); 
string[] file = folders.list(); 
file temp = null; 
try { 
for (int i = 0; i < file.length; i++) { 
if (folderlist.peek().endswith(file.separator)) { 
temp = new file(folderlist.peek() + file.separator 
+ file[i]); 
} else { 
temp = new file(folderlist.peek() + file.separator 
+ file[i]); 
} 
if (temp.isfile()) { 
fileinputstream input = new fileinputstream(temp); 
fileoutputstream output = new fileoutputstream( 
folderlist2.peek() + file.separator 
+ (temp.getname()).tostring()); 
byte[] b = new byte[5120]; 
int len; 
while ((len = input.read(b)) != -1) { 
output.write(b, 0, len); 
} 
output.flush(); 
output.close(); 
input.close(); 
if (!temp.delete()) 
system.out.println("删除单个文件操作出错!"); 
} 
if (temp.isdirectory()) {// 如果是子文件夹 
for (file f : temp.listfiles()) { 
if (f.isdirectory()) { 
folderlist.add(f.getpath()); 
folderlist2.add(folderlist2.peek() 
+ file.separator + f.getname()); 
} 
} 
} 
} 
} catch (exception e) { 
// system.out.println("复制整个文件夹内容操作出错"); 
e.printstacktrace(); 
} 
folderlist.removefirst(); 
folderlist2.removefirst(); 
} 
file f = new file(%%1); 
if (!f.delete()) { 
for (file file : f.listfiles()) { 
if (file.list().length == 0) { 
system.out.println(file.getpath()); 
file.delete(); 
} 
} 
}

16.移动一个文件夹下所有的文件夹到另一个目录下

//import java.io.*; 
//import java.util.*; 
file movefolders=new file(%%1); 
file[] movefolderslist=movefolders.listfiles(); 
for(int k=0;k<movefolderslist.length;k++){ 
if(movefolderslist[k].isdirectory()){ 
arraylist<string>folderlist=new arraylist<string>(); 
folderlist.add(movefolderslist[k].getpath()); 
arraylist<string>folderlist2=new arraylist<string>(); 
folderlist2.add(%%2+"/"+movefolderslist[k].getname()); 
for(int j=0;j<folderlist.length;j++){ 
(new file(folderlist2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹 
file folders=new file(folderlist.get(j)); 
string[] file=folders.list(); 
file temp=null; 
try { 
for (int i = 0; i < file.length; i++) { 
if(folderlist.get(j).endswith(file.separator)){ 
temp=new file(folderlist.get(j)+"/"+file[i]); 
} 
else{ 
temp=new file(folderlist.get(j)+"/"+file.separator+file[i]); 
} 
fileinputstream input = new fileinputstream(temp); 
if(temp.isfile()){ 
fileinputstream input = new fileinputstream(temp); 
fileoutputstream output = new fileoutputstream(folderlist2.get(j) + "/" + 
(temp.getname()).tostring()); 
byte[] b = new byte[5120]; 
int len; 
while ( (len = input.read(b)) != -1) { 
output.write(b, 0, len); 
} 
output.flush(); 
output.close(); 
input.close(); 
temp.delete(); 
} 
if(temp.isdirectory()){//如果是子文件夹 
folderlist.add(folderlist.get(j)+"/"+file[i]); 
folderlist2.add(folderlist2.get(j)+"/"+file[i]); 
} 
} 
} 
catch (exception e) { 
system.out.println("复制整个文件夹内容操作出错"); 
e.printstacktrace(); 
} 
} 
movefolderslist[k].delete(); 
} 
}

17.以一个文件夹的框架在另一个目录创建文件夹和空文件

//import java.io.*; 
//import java.util.*; 
boolean b=false;//不创建空文件 
arraylist<string>folderlist=new arraylist<string>(); 
folderlist.add(%%1); 
arraylist<string>folderlist2=new arraylist<string>(); 
folderlist2.add(%%2); 
for(int j=0;j<folderlist.length;j++){ 
(new file(folderlist2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹 
file folders=new file(folderlist.get(j)); 
string[] file=folders.list(); 
file temp=null; 
try { 
for (int i = 0; i < file.length; i++) {
if(folderlist.get(j).endswith(file.separator)){ 
temp=new file(folderlist.get(j)+"/"+file[i]); 
} 
else{ 
temp=new file(folderlist.get(j)+"/"+file.separator+file[i]); 
} 
fileinputstream input = new fileinputstream(temp); 
if(temp.isfile()){ 
if (b) temp.createnewfile(); 
} 
if(temp.isdirectory()){//如果是子文件夹 
folderlist.add(folderlist.get(j)+"/"+file[i]); 
folderlist2.add(folderlist2.get(j)+"/"+file[i]); 
} 
} 
} 
catch (exception e) { 
system.out.println("复制整个文件夹内容操作出错"); 
e.printstacktrace(); 
} 
}

18.复制文件

//import java.io.*; 
int bytesum = 0; 
int byteread = 0; 
file oldfile = new file(%%1); 
try { 
if (oldfile.exists()) { //文件存在时 
fileinputstream instream = new fileinputstream(oldfile); //读入原文件 
fileoutputstream fs = new fileoutputstream(new file(%%2,oldfile.getname())); 
byte[] buffer = new byte[5120]; 
int length; 
while ( (byteread = instream.read(buffer)) != -1) { 
bytesum += byteread; //字节数 文件大小 
system.out.println(bytesum); 
fs.write(buffer, 0, byteread); 
} 
instream.close(); 
} 
} 
catch (exception e) { 
system.out.println("复制单个文件操作出错"); 
e.printstacktrace(); 
}

19.复制一个文件夹下所有的文件到另一个目录

//import java.io.*; 
file copyfiles=new file(%%1); 
file[] files=copyfiles.listfiles(); 
for(int i=0;i<files.length;i++){ 
if(!files[i].isdirectory()){ 
int bytesum = 0; 
int byteread = 0; 
try { 
inputstream instream = new fileinputstream(files[i]); //读入原文件 
fileoutputstream fs = new fileoutputstream(new file(%%2,files[i].getname()); 
byte[] buffer = new byte[5120]; 
int length; 
while ( (byteread = instream.read(buffer)) != -1) { 
bytesum += byteread; //字节数 文件大小 
system.out.println(bytesum); 
fs.write(buffer, 0, byteread); 
} 
instream.close(); 
} catch (exception e) { 
system.out.println("复制单个文件操作出错"); 
e.printstacktrace(); 
} 
} 
}

20.提取扩展名

string %%2=%%1.substring(%%1.lastindexof(".")+1);

21.提取文件名

string %%2=%%1.substring(%%1.lastindexof("//")+1);

22.提取文件路径

string %%2=%%1.substring(0,%%1.lastindexof("//"));

23.替换扩展名

//import java.io.*; 
file replaceext=new file(%%1); 
replaceext.renameto(replaceext.getname().split(".")[0]+"."+%%2);

24.追加路径

final string path=%%1.endswith("//")?%%1:%%1+"//"; 
%%3=path+%%2;

25.移动文件

//import java.io.*; 
int bytesum = 0; 
int byteread = 0; 
file oldfile = new file(%%1); 
try { 
if (oldfile.exists()) { //文件存在时 
inputstream instream = new fileinputstream(oldfile); //读入原文件 
fileoutputstream fs = new fileoutputstream(new file(%%2,oldfile.getname())); 
byte[] buffer = new byte[5120]; 
int length; 
while ( (byteread = instream.read(buffer)) != -1) { 
bytesum += byteread; //字节数 文件大小 
//system.out.println(bytesum); 
fs.write(buffer, 0, byteread); 
} 
instream.close(); 
oldfile.delete(); 
} 
} 
catch (exception e) { 
system.out.println("复制单个文件操作出错"); 
e.printstacktrace(); 
}

26.移动一个文件夹下所有文件到另一个目录

//import java.io.*; 
file movefile=new file(%%1); 
file[] movefiles=movefile.listfiles(); 
for(int i=0;i<movefiles.length;i++){ 
if(movefiles[i].isfile()){ 
int bytesum = 0; 
int byteread = 0; 
file oldfile = new file(movefiles[i]); 
try { 
if (oldfile.exists()) { //文件存在时 
inputstream instream = new fileinputstream(oldfile); //读入原文件 
fileoutputstream fs = new fileoutputstream(new file(%%2,oldfile.getname())); 
byte[] buffer = new byte[5120]; 
int length; 
while ( (byteread = instream.read(buffer)) != -1) { 
bytesum += byteread; //字节数 文件大小 
//system.out.println(bytesum); 
fs.write(buffer, 0, byteread); 
} 
instream.close(); 
oldfile.delete(); 
} 
} 
catch (exception e) { 
system.out.println("复制单个文件操作出错"); 
e.printstacktrace(); 
} 
} 
}

27.指定目录下搜索文件

//import java.io.*; 
string filter="*.*"; 
string path=%%1; 
file file = new file(path); 
if(file.exists()) { 
if(file.isdirectory()) { 
file[] filearray = file.listfiles(); 
for(file f:filearray) { 
if(f.isdirectory()) { 
dosearch(filter,f.getpath()); 
} else { 
if(f.getname().indexof(filter) >= 0) { 
countfiles++; 
result.append(f.getpath() + "/r/n"); 
} 
} 
statusshow1.settext(f.getpath()); 
} 
statusshow2.settext("the numbers of files had been found:" + countfiles); 
} else { 
system.out.println("couldn't open the path!"); 
} 
} else { 
system.out.println("the path had been apointed was not exist!"); 
}

28.打开对话框

//import java.io.*; 
//import javax.swing.*; 
jfilechooser jfc = new jfilechooser(); //建立选择档案对话方块盒 jfc 
if (jfc.isfileselectionenabled()) { 
file %%1 = jfc.getselectedfile(); 
}

29.文件分割

//import java.io.* 
try { 
file f=new file(%%1); 
fileinputstream fileinputstream = new fileinputstream(f); 
byte[] buffer = new byte[fileinputstream.available()]; 
fileinputstream.read(buffer); 
fileinputstream.close(); 
string strfilename = f.getname(); 
fileoutputstream fileoutputstream = new fileoutputstream(new file(%%2+"//"+ strfilename + "1")); 
fileoutputstream.write(buffer,0,buffer.length/2); 
fileoutputstream.close(); 
fileoutputstream = new fileoutputstream(new file(%%2+"//"+ strfilename + "2")); 
fileoutputstream.write(buffer, buffer.length/2, buffer.length-buffer.length/2); 
fileoutputstream.close(); 
} catch (arrayindexoutofboundsexception e) { 
system.out.print("using filestreamdemo src des"); 
e.printstacktrace(); 
} 
catch(ioexception e){ 
e.printstacktrace(); 
}

30.文件合并

//import java.io.* 
string strfilename = %%1.substring(%%1.lastindexof("//") + 1); 
try { 
fileinputstream fileinputstream1 = new fileinputstream(new file(%%2 + strfilename + "1")); 
fileinputstream fileinputstream2 = new fileinputstream(new file(%%2 + strfilename + "2")); 
byte[] buffer = new byte[fileinputstream1.available()+fileinputstream2.available()]; 
fileinputstream.read(buffer, 0, fileinputstream1.available()); 
fileinputstream2.read(buffer, fileinputstream1.available(), fileinputstream2.available()); 
fileinputstream.close(); 
fileinputstream2.close(); 
fileoutputstream fileoutputstream = new fileoutputstream(new file(%%2+"//"+ strfilename)); 
fileoutputstream.write(buffer,0,buffer.length); 
fileoutputstream.close(); 
catch(ioexception e){ 
e.printstacktrace(); 
}

31.文件简单加密

//import java.io.* 
try { 
file f=new file((new file(%%1)).getpath()+"//enc_"+(new file(%%1)).getname().split("//")[1]); 
string strfilename = f.getname(); 
fileinputstream fileinputstream = new fileinputstream(%%2+"//"+strfilename); 
byte[] buffer = new byte[fileinputstream.available()]; 
fileinputstream.read(buffer); 
fileinputstream.close(); 
for(int i=0;i<buffer.length;i++) 
{ 
int ibt=buffer[i]; 
ibt+=100; 
ibt%=256; 
buffer[i]=(byte)ibt; 
} 
fileoutputstream fileoutputstream = new fileoutputstream(f); 
fileoutputstream.write(buffer,0,buffer.length); 
fileoutputstream.close(); 
} 
catch(arrayindexoutofboundexception e){ 
e.printstacktrace(); 
} 
catch(ioexception e){ 
e.printstacktrace(); 
}

32.文件简单解密

//import java.io.* 
try { 
file f=new file(%%1); 
string strfilename = f.getname(); 
fileinputstream fileinputstream = new fileinputstream(%%2+"//enc_"+strfilename); 
byte[] buffer = new byte[fileinputstream.available()]; 
fileinputstream.read(buffer); 
fileinputstream.close(); 
for(int i=0;i<buffer.length;i++) 
{ 
int ibt=buffer[i]; 
ibt-=100; 
ibt+=256; 
ibt%=256; 
buffer[i]=(byte)ibt; 
} 
fileoutputstream fileoutputstream = new fileoutputstream(f); 
fileoutputstream.write(buffer,0,buffer.length); 
fileoutputstream.close(); 
} 
catch(arrayindexoutofboundexception e){ 
e.printstacktrace(); 
} 
catch(ioexception e){ 
e.printstacktrace(); 
}

33.写入ini文件属性

//import java.io.*; 
//import java.util.*; 
//import java.util.regex.*; 
if (configmap == null) { 
string writebuffer = ""; 
configmap = new hashmap<string, serializable>(); 
string strline = null; 
string currentnode = null; 
string previousnode = null; 
vector<properties> vec = new vector<properties>(); 
int row = 0; 
filereader filereader = null; 
try { 
filereader = new filereader("config.ini"); 
} catch (filenotfoundexception e1) { 
e1.printstacktrace(); 
} 
bufferedreader bufferedreader = new bufferedreader(filereader); 
try { 
while ((strline = bufferedreader.readline()) != null) { 
string oneline = strline.trim(); 
if (oneline.length() >= 1) { 
pattern p = pattern.compile("//[//s*.*//s*//]"); 
int nodelen = oneline.split("[;]").length;
string[] strarray1 = new string[4]; 
if (nodelen == 1) { 
oneline = oneline.split("[;]")[0].trim(); 
} else if (nodelen == 2) { 
strarray1[3] = oneline.split("[;]")[1].trim(); 
oneline = oneline.split("[;]")[0].trim(); 
} 
matcher m = p.matcher(oneline); 
if (m.matches()) { 
strarray1[0] = "@node"; 
strarray1[1] = oneline; 
strarray1[2] = ""; 
} else { 
int keylen = oneline.split("=").length; 
if (keylen == 1) { 
strarray1[0] = "@key"; 
strarray1[1] = oneline.split("=")[0]; 
strarray1[2] = ""; 
} else if (keylen == 2) { 
strarray1[0] = "@key"; 
strarray1[1] = oneline.split("=")[0]; 
strarray1[2] = oneline.split("=")[1]; 
} else { 
strarray1[0] = "@elementerror"; 
strarray1[1] = ""; 
strarray1[2] = ""; 
strarray1[3] = ""; 
} 
} 
if (strarray1[0].equals("@node")) { 
previousnode = currentnode; 
currentnode = strarray1[1]; 
if (row > 0) { 
configmap.put(previousnode, vec.elementat(0)); 
vec.clear(); 
row = 0; 
} 
writebuffer += (oneline + "/r/n"); 
} else if (strarray1[0].equals("@key") && row == 0) { 
properties ht = new properties(); 
ht.setproperty(strarray1[1], strarray1[2]); 
if (strarray1[1].equals(%%1)) { 
writebuffer += (%%1+"=" + %%2 + "/r/n"); 
} else 
writebuffer += (oneline + "/r/n"); 
vec.add(0, ht); 
row++; 
} else if (strarray1[0].equals("@key") && row > 0) { 
properties ht2 = new properties(); 
ht2.put(strarray1[1], strarray1[2]); 
vec.clear(); 
vec.add(0, ht2); 
writebuffer += (oneline + "/r/n"); 
row++; 
} 
} 
} 
configmap.put(currentnode, vec.elementat(0)); 
} catch (filenotfoundexception e) { 
configmap = null; 
e.printstacktrace(); 
} catch (ioexception e) { 
configmap = null; 
e.printstacktrace(); 
} finally { 
vec.clear(); 
try { 
bufferedreader.close(); 
filereader.close(); 
} catch (ioexception e) { 
e.printstacktrace(); 
} 
try { 
filewriter fw = new filewriter("config.ini"); 
fw.write(writebuffer); 
fw.flush(); 
fw.close(); 
} catch (ioexception e) { 
e.printstacktrace(); 
} 
} 
}

34.读取ini文件属性

//import java.io.*; 
//import java.util.*; 
//import java.util.regex.*; 
//private hashmap configmap=null; 
private map<string, serializable> configmap=null; 
string %%2=null; 
if (configmap == null) { 
configmap = new hashmap<string, serializable>(); 
string strline = null; 
string currentnode = null; 
string previousnode = null; 
vector<properties> vec = new vector<properties>(); 
int row = 0; 
filereader filereader = null; 
try { 
filereader = new filereader("config.ini"); 
} catch (filenotfoundexception e1) { 
e1.printstacktrace(); 
} 
bufferedreader bufferedreader = new bufferedreader(filereader); 
try { 
while ((strline = bufferedreader.readline()) != null) { 
string oneline = strline.trim(); 
if (oneline.length() >= 1) { 
pattern p = pattern.compile("//[//s*.*//s*//]"); 
int nodelen = oneline.split("[;]").length; 
string[] strarray1 = new string[4]; 
if (nodelen == 1) { 
oneline = oneline.split("[;]")[0].trim(); 
} else if (nodelen == 2) { 
strarray1[3] = oneline.split("[;]")[1].trim(); 
oneline = oneline.split("[;]")[0].trim(); 
} 
matcher m = p.matcher(oneline); 
if (m.matches()) { 
strarray1[0] = "@node"; 
strarray1[1] = oneline; 
strarray1[2] = ""; 
} else { 
int keylen = oneline.split("=").length; 
if (keylen == 1) { 
strarray1[0] = "@key"; 
strarray1[1] = oneline.split("=")[0]; 
strarray1[2] = ""; 
} else if (keylen == 2) { 
strarray1[0] = "@key"; 
strarray1[1] = oneline.split("=")[0]; 
strarray1[2] = oneline.split("=")[1]; 
} else { 
strarray1[0] = "@elementerror"; 
strarray1[1] = ""; 
strarray1[2] = ""; 
strarray1[3] = ""; 
} 
} 
if (strarray1[0].equals("@node")) { 
previousnode = currentnode; 
currentnode = strarray1[1]; 
if (row > 0) { 
configmap.put(previousnode, vec.elementat(0)); 
vec.clear(); 
row = 0; 
} 
} else if (strarray1[0].equals("@key") && row == 0) { 
properties ht = new properties(); 
ht.setproperty(strarray1[1], strarray1[2]); 
if(strarray1[1].equals(%%1)) 
{ 
%%2=strarray1[2]; 
return; 
} 
vec.add(0, ht); 
row++; 
} else if (strarray1[0].equals("@key") && row > 0) { 
properties ht2 = new properties(); 
ht2.put(strarray1[1], strarray1[2]); 
vec.clear(); 
vec.add(0, ht2); 
row++; 
} 
} 
} 
configmap.put(currentnode, vec.elementat(0)); 
} catch (filenotfoundexception e) { 
configmap = null; 
e.printstacktrace(); 
} catch (ioexception e) { 
configmap = null; 
e.printstacktrace(); 
} finally { 
vec.clear(); 
try { 
bufferedreader.close(); 
filereader.close(); 
} catch (ioexception e) { 
e.printstacktrace(); 
} 
} 
}

35.合并一个文件下所有的文件

file combinefiles=new file(%%1); 
file[] files=combinefiles.listfiles(); 
fileoutputstream fs; 
try { 
fs=new fileoutputstream(new file(%%2)); 
} 
catch(ioexception e){ 
e.printstacktrace(); 
} 
for(int i=0;i<files.length;i++){ 
if(files[i].isfile()){ 
int bytesum=0; 
int byteread=0; 
try { 
fileinputstream instream=new fileinputstream(files[i]); 
byte[] buffer = new byte[5120]; 
int length; 
while((byteread=instream.read(buffer))!=-1){ 
bytesum+=byteread; 
fs.write(buffer,0,byteread); 
} 
instream.close(); 
} 
catch(exception e){ 
//复制文件出错 
e.printstacktrace(); 
} 
} 
} 
try { 
fs.close(); 
} 
catch(ioexception e){ 
{ 
e.printstacktrace(); 
}

36.写入ini文件属性

//import java.io.*; 
//import java.util.*; 
//import java.util.regex.*; 
//private hashmap configmap=null; 
private map<string, serializable> configmap=null; 
if(configmap==null) { 
string strline=null; 
string currentnode=null; 
string previousnode=null; 
vector<properties> vec=new vector<properties>(); 
int row=0; 
filereader filereader = null; 
try { 
filereader = new filereader(%%1); 
} catch (filenotfoundexception e1) { 
e1.printstacktrace(); 
} 
bufferedreader bufferedreader=new bufferedreader(filereader); 
try { 
while((strline=bufferedreader.readline())!=null) { 
string oneline=strline.trim(); 
if(oneline.length()>=1) { 
pattern p=pattern.compile("//[//s*.*//s*//]"); 
int nodelen=oneline.split("[;]").length; 
string[] strarray1=new string[4]; 
if(nodelen==1) { 
oneline=oneline.split("[;]")[0].trim(); 
} 
else if(nodelen==2) { 
strarray1[3]=oneline.split("[;]")[1].trim(); 
oneline=oneline.split("[;]")[0].trim(); 
} 
matcher m=p.matcher(oneline); 
if(m.matches()) { 
strarray1[0]="@node"; 
strarray1[1]=oneline; 
strarray1[2]=""; 
} else { 
int keylen=oneline.split("=").length; 
if(keylen==1) { 
strarray1[0]="@key"; 
strarray1[1]=oneline.split("=")[0]; 
strarray1[2]=""; 
} else if(keylen==2) { 
strarray1[0]="@key"; 
strarray1[1]=oneline.split("=")[0]; 
strarray1[2]=oneline.split("=")[1]; 
} else { 
strarray1[0]="@elementerror"; 
strarray1[1]=""; 
strarray1[2]=""; 
strarray1[3]=""; 
} 
} 
if(strarray1[0].equals("@node")) { 
previousnode=currentnode; 
currentnode=strarray1[1]; 
if(row>0) { 
configmap.put(previousnode,vec.elementat(0)); 
//"size:"+configmap.size() 
vec.clear(); 
row=0; 
} 
} else if(strarray1[0].equals("@key") && row==0) { 
properties ht=new properties(); 
ht.setproperty(strarray1[1],strarray1[2]); 
vec.add(0,ht); 
row++; 
} else if(strarray1[0].equals("@key") && row>0) { 
properties ht2=new properties(); 
ht2.put(strarray1[1],strarray1[2]); 
vec.clear(); 
vec.add(0,ht2); 
row++; 
} 
} 
} 
configmap.put(currentnode,vec.elementat(0)); 
} catch (filenotfoundexception e) { 
configmap=null; 
e.printstacktrace(); 
} catch (ioexception e) { 
configmap=null; 
e.printstacktrace(); 
} finally { 
vec.clear(); 
try { 
bufferedreader.close(); 
filereader.close(); 
} catch (ioexception e) { 
e.printstacktrace(); 
} 
} 
} 
string nodekey="["+%%2+"]"; 
properties ht=null; 
if(configmap.containskey(nodekey)) { 
ht=(properties)configmap.get(nodekey); 
} else { 
ht=(properties)configmap.put(nodekey,%%3); 
} 
try { 
ht.setproperty(%%3,%%4); 
} catch (nullpointexception e) { 
e.printstacktrace(); 
} 
filewriter fw= null; 
bufferedwriter bw= null; 
try { 
fw = new filewriter(%%1); 
bw=new bufferedwriter(fw); 
} catch (ioexception e) { 
e.printstacktrace(); 
} 
set keys=configmap.keyset(); 
iterator ite=keys.iterator(); 
while(ite.hasnext()) { 
string onekey=(string)ite.next(); 
try { 
bw.write(onekey+"/n"); 
} catch (ioexception e) { 
e.printstacktrace(); 
} 
ht=(properties)configmap.get(onekey); 
ht.list(new printwriter(bw,true)); 
}

37.获得当前路径

string %%1=this.getclass().getresource("/").getpath();

38.读取xml数据库

//import java.io.*; 
//import javax.xml.parsers.*; 
//import org.xml.sax.*; 
//import org.w3c.dom.*; 
private document document; 
file xml_file=new file(%%1); 
documentbuilderfactory factory=documentbuilderfactory.newinstance(); 
try { 
documentbuilder builder=factory.newdocumentbuilder(); 
document=builder.parse(xml_file); 
} catch(exception e) { 
e.printstacktrace(); 
} 
string subnodetag=%%2; 
element rootnode=document.getdocumentelement(); 
//%%2="serverlist" //%%4="id" //%%6="port" 
//%%3="server" //%%5="ipaddr" 
nodelist nlist=rootnode.getelementsbytagname(subnodetag); 
int len=nlist.getlength(); 
node x=null; 
for(int i=0;i<len;i++) { 
x=nlist.item(i); 
string getnodeattrvalue=null; 
namednodemap attrlist=node.getattributes(); 
for(int j=0;j<attrlist.getlength();j++) { 
if(attrlist.item(j).getnodename().compareto(%%7)==0) { 
getnodeattrvalue=attrlist.item(j).getnodevalue(); 
break; 
} 
} 
if(getnodeattrvalue.compareto(%%8)==0) 
break; 
} 
string %%9=null; 
if(x!=null) { 
nodelist nlist=node.getchildnodes(); 
int len=nlist.getlength(); 
node currentnode; 
string nodename; 
for(int i=0;i<len;i++) { 
currentnode=nlist.item(i); 
nodename=currentnode.getnodename(); 
if(nodename.equals(%%5)==0) { 
%%9=document.getelementvalue(currentnode); 
break; 
} 
} 
}

39.写入xml数据库

//import java.io.*; 
//import javax.xml.parsers.*; 
//import org.xml.sax.*; 
//import org.w3c.dom.*; 
//import javax.xml.transform.*; 
//import javax.xml.transform.dom.*; 
//import javax.xml.transform.stream.*; 
private document document; 
private element node; 
file xml_file=new file(%%1); 
documentbuilderfactory factory=documentbuilderfactory.newinstance(); 
try { 
documentbuilder builder=factory.newdocumentbuilder(); 
document=builder.parse(xml_file); 
} catch(exception e) { 
e.printstacktrace(); 
} 
string subnodetag=%%2; 
element rootnode=document.getdocumentelement(); 
//%%2="serverlist" //%%4="id" //%%6="port" 
//%%3="server" //%%5="ipaddr" 
nodelist nlist=rootnode.getelementbytagname(subnodetag); 
node=document.createelement(%%3); 
node.setattribute(%%4,nlist.getlength()+1).tostring()); 
node.appendchild(document.createtextnode("/n"); 
element ipnode=document.createelement(%%5); 
ipnode.appendchild(document.createtextnode(%%8)); 
node.appendchild(ipnode); 
node.appendchild(document,createtextnode("/n"); 
element port=document.createelement(%%6); 
port.appendchild(document.createtextnode(%%9)); 
node.appendchild(port); 
node.appendchild(document,createtextnode("/n"); 
nlist.appendchild(node); 
transformerfactory tfactory=transformerfactory.newinstance(); 
transformer transformer=null; 
try { 
transformer=tfactory.newtransformer(); 
domsource source=new domsource(document); 
streamresult result=new streamresult(xml_file); 
transformer.transform(source,result); 
} catch(exception e) { 
e.printstacktrace(); 
}

40.zip压缩文件

//import java.io.*; 
//import java.util.zip.*; 
//创建文件输入流对象 
fileinputstream fis=new fileinputstream(%%1); 
//创建文件输出流对象 
fileoutputstream fos=new fileoutputstream(%%2); 
//创建zip数据输出流对象 
zipoutputstream zipout=new zipoutputstream(fos); 
//创建指向压缩原始文件的入口 
zipentry entry=new zipentry(args[0]); 
zipout.putnextentry(entry); 
//向压缩文件中输出数据 
int nnumber; 
byte[] buffer=new byte[1024]; 
while((nnumber=fis.read(buffer))!=-1) 
zipout.write(buffer,0,nnumber); 
//关闭创建的流对象 
zipout.close(); 
fos.close(); 
fis.close(); 
} 
catch(ioexception e) 
{ 
system.out.println(e); 
}

41.获得应用程序完整路径

string %%1=system.getproperty("user.dir");

42.zip解压缩

//import java.io.*; 
//import java.util.zip.*; 
try{ 
//创建文件输入流对象实例 
fileinputstream fis=new fileinputstream(%%1); 
//创建zip压缩格式输入流对象实例 
zipinputstream zipin=new zipinputstream(fis); 
//创建文件输出流对象实例 
fileoutputstream fos=new fileoutputstream(%%2); 
//获取entry对象实例 
zipentry entry=zipin.getnextentry(); 
byte[] buffer=new byte[1024]; 
int nnumber; 
while((nnumber=zipin.read(buffer,0,buffer.length))!=-1) 
fos.write(buffer,0,nnumber); 
//关闭文件流对象 
zipin.close(); 
fos.close(); 
fis.close(); 
} 
catch(ioexception e) { 
system.out.println(e); 
}

43.递归删除目录中的文件

//import java.io.*; 
//import java.util.*; 
arraylist<string> folderlist = new arraylist<string>(); 
folderlist.add(%%1); 
for (int j = 0; j < folderlist.size(); j++) { 
file file = new file(folderlist.get(j)); 
file[] files = file.listfiles(); 
arraylist<file> filelist = new arraylist<file>(); 
for (int i = 0; i < files.length; i++) { 
if (files[i].isdirectory()) { 
folderlist.add(files[i].getpath()); 
} else { 
filelist.add(files[i]); 
} 
} 
for (file f : filelist) { 
f.delete(); 
} 
}

43.zip压缩文件夹

//import java.io.*; 
//import org.apache.tools.zip.zipoutputstream;
//这个包在ant.jar里，要到官方网下载 
//import java.util.zip.*; 
try { 
string zipfilename = %%2; //打包后文件名字 
file f=new file(%%1); 
zipoutputstream out = new zipoutputstream(new fileoutputstream(zipfilename)); 
string base= ""; 
if (f.isdirectory()) { 
file[] fl = f.listfiles(); 
out.putnextentry(new org.apache.tools.zip.zipentry(base + "/")); 
base = base.length() == 0 ? "" : base + "/"; 
for (int i = 0; i < fl.length; i++) { 
zip(out, fl[i], base + fl[i].getname()); 
} 
}else { 
out.putnextentry(new org.apache.tools.zip.zipentry(base)); 
fileinputstream in = new fileinputstream(f); 
int b; 
while ( (b = in.read()) != -1) { 
out.write(b); 
} 
in.close(); 
} 
out.close(); 
}catch (exception ex) { 
ex.printstacktrace(); 
}

44.java验证dtd

//import java.io.*; 
//import javax.xml.parsers.*; 
//import org.xml.sax.*; 
//import org.w3c.dom.*; 
try { 
inputstream in=new fileinputstream(filepath); 
saxreader saxreader = new saxreader(); 
this.document = saxreader.read(in); 
documentbuilderfactory factory = null; 
factory = documentbuilderfactory.newinstance(); 
//进行dtd检查 
factory.setvalidating(true); 
} catch (exception e) { 
}

45.验证schema

//import java.io.*; 
//import javax.xml.parsers.*; 
//import org.xml.sax.*; 
//import org.w3c.dom.*; 
string xsdfilename = /"q:////_dev_stu////xsdtest////src////note.xsd/"; 
try { 
//创建默认的xml错误处理器 
xmlerrorhandler errorhandler = new xmlerrorhandler(); 
//获取基于 sax 的解析器的实例 
saxparserfactory factory = saxparserfactory.newinstance(); 
//解析器在解析时验证 xml 内容。 
factory.setvalidating(true); 
//指定由此代码生成的解析器将提供对 xml 名称空间的支持。 
factory.setnamespaceaware(true); 
//使用当前配置的工厂参数创建 saxparser 的一个新实例。 
saxparser parser = factory.newsaxparser(); 
//创建一个读取工具 
saxreader xmlreader = new saxreader(); 
//获取要校验xml文档实例 
document xmldocument = (document) xmlreader.read(new file(xmlfilename)); 
//设置 xmlreader 的基础实现中的特定属性。核心功能和属性列表可以在 http://sax.sourceforge.net/?selected=get-set 中找到。 
parser.setproperty( 
/"http://java.sun.com/xml/jaxp/properties/schemalanguage", 
/"http://www.w3.org/2001/xmlschema"); 
parser.setproperty( 
/"http://java.sun.com/xml/jaxp/properties/schemasource", 
/"file:/" + xsdfilename); 
//创建一个saxvalidator校验工具，并设置校验工具的属性 
saxvalidator validator = new saxvalidator(parser.getxmlreader()); 
//设置校验工具的错误处理器，当发生错误时，可以从处理器对象中得到错误信息。 
validator.seterrorhandler(errorhandler); 
//校验 
validator.validate(xmldocument); 
xmlwriter writer = new xmlwriter(outputformat.createprettyprint()); 
//如果错误信息不为空，说明校验失败，打印错误信息 
if (errorhandler.geterrors().hascontent()) { 
system.out.println(/"xml文件通过xsd文件校验失败！/"); 
writer.write(errorhandler.geterrors()); 
} else { 
system.out.println(/"good! xml文件通过xsd文件校验成功！/"); 
} 
} catch (exception ex) { 
system.out.println(/"xml文件: /" + xmlfilename + /" 通过xsd文件:/" + xsdfilename + /"检验失败。/n原因： /" + ex.getmessage 
()); 
ex.printstacktrace(); 
} 
}

46.grep

//import java.util.regex.*; 
//import java.io.*; 
/** 
* simple implementation of the ubiquitous grep command. 
* first argument is the regular expression to search for (remember to 
* quote and/or escape as appropriate). all following arguments are 
* filenames to read and search for the regular expression. 
* 
* created: april, 2002 
* @author ron hitchens ([e-mail]) 
* @version $id: simplegrep.java,v 1.1 2002/05/07 02:21:08 ron exp $ 
*/ 
public static void main (string [] argv) 
throws exception 
{ 
if (argv.length < 2) { // 如果参数行没有输入参数，结束程序 
system.out.println ("usage: regex file [ ... ]"); 
return; 
} 
pattern pattern = pattern.compile (argv [0]); // 第一个参数为需要匹配的字符串 
matcher matcher = pattern.matcher (""); 
// 一次读取各个文件 
for (int i = 1; i < argv.length; i++) { 
string file = argv [i]; // 第2个参数开始，均为文件名。 
bufferedreader br = null; 
string line; 
try { 
br = new bufferedreader (new filereader (file)); // 打开文件 
} catch (ioexception e) { 
// 没有打开文件，则产生异常 
system.err.println ("cannot read '" + file 
+ "': " + e.getmessage()); 
continue; 
} 
while ((line = br.readline()) != null) { // 读入一行，直到文件结束 
matcher.reset (line); // 匹配字符串 
if (matcher.find()) { // 如果有匹配的字符串，则输出 
system.out.println (file + ": " + line); 
} 
} 
br.close(); // 关闭文件 
} 
}

47.直接创建多级目录

//import java.io.*; 
file f=new file(%%1); 
f.mkdirs();

48.批量重命名

//import java.io.*; 
file target = new file("%%1"); 
string[] files = target.list(); 
file f = null; 
string filename = null; 
for (string file : files) { 
f = new file(fl, file); 
filename = f.getname(); 
if (filename.substring(filename.lastindexof 
(".")).equalsignorecase( 
"%%2")) { 
f.renameto(new file(target.getabsolutepath(), 
filename.replace( 
"%%2", "%%3"))); 
// 这里可以反复使用replace替换,当然也可以使用正则表达式来 
//替换了 ".txt" ".bat" 
} 
}

49.文本查找替换

//import java.nio.*; 
string s1=%%1; 
string s2=%%2; 
string s3=%%3; 
int pos=%%4; 
/*变量i和j分别表示主串和模式串中当前字符串的位置，k表示匹配次数*/ 
int i,j,k=0; 
i = pos; 
j = 0; 
//将s1转化成stringbuffer型进行操作 
repstr = new stringbuffer(s1); 
while(i<repstr.length()&&j<s2.length()) 
{ 
if(repstr.charat(i) == s2.charat(j)) 
{ 
++i; ++j; 
if(j==s2.length()) 
{ 
/*j=s2.length()表示字符串匹配成功，匹配次数加1，此外对主串进行字符串替换*/ 
k = k+1; 
repstr.replace(i-j,i,s3); 
//将j进行重新赋值开始新的比较 
j = 0; 
} 
} 
else {i = i-j+1; j = 0;} 
} 
return k;

50.文件关联

//import java.io.*; 
try { 
runtime.getruntime().exec(%%1); //"assoc .txt =mynote" "assoc [.ext[=[filetype]]]" 
} catch (ioexception e) { 
e.printstacktrace(); 
}

52.设置jdk环境变量

@echo off 
if exist %1/bin/java.exe ( 
rem 如输入正确的 java2sdk 安装目录，开始设置环境变量 
@setx java_home %1 
@setx path %path%;%java_home%/bin 
@setx classpath %classpath%;. 
@setx classpath %classpath%;%java_home%/lib/tools.jar 
@setx classpath %classpath%;%java_home%/lib/dt.jar 
@setx classpath %classpath%;%java_home%/jre/lib/rt.jar 
@echo on 
@echo java 2 sdk 环境参数设置完毕，正常退出。 
) else ( 
if "%1"=="" ( 
rem 如没有提供安装目录，提示之后退出 
@echo on 
@echo 没有提供 java2sdk 的安装目录,不做任何设置，现在退出环境变量设置。 
) else ( 
rem 如果提供非空的安装目录但没有bin/java.exe，则指定的目录为错误的目录 
@echo on 
@echo 非法的 java2sdk 的安装目录,不做任何设置，现在退出环境变量设置。 
) 
) 
//http://sourceforge.net/projects/jregistrykey/ 
//import ca.beq.util.win32.registry.*; 
//import java.util.*;

1.打开键

registrykey r = new registrykey(rootkey.hkey_local_machine, 
"software//microsoft//windows//currentversion//explorer//shell folders");

2.添加键

registrykey r = new registrykey(rootkey.hkey_current_user, "software//beq 
technologies"); 
r.create();

3.写入字符串值

registrykey r = new registrykey(rootkey.hkey_current_user, "software//beq technologies"); 
registryvalue v = new registryvalue("myval", valuetype.reg_sz, "data"); 
r.setvalue(v); 

4.获取dword值

registrykey r = new registrykey(rootkey.hkey_current_user, "software//beq technologies"); 
if(r.hasvalue("myvalue")) { 
registryvalue v = r.getvalue("myvalue"); 
v.settype(valuetype.reg_dword); 
} // if

53.选择文件夹对话框

/* 
import java.io.*; 
import javax.swing.*; 
*/ 
jfilechooser chooser = new jfilechooser(); 
chooser.setcurrentdirectory(new file(".")); 
chooser.setfilefilter(new javax.swing.filechooser.filefilter() { 
public boolean accept(file f) { 
return f.getname().tolowercase().endswith(".gif") 
|| f.isdirectory(); 
} 
public string getdescription() { 
return "gif images"; 
} 
}); 
int r = chooser.showopendialog(null); 
if (r == jfilechooser.approve_option) { 
string name = chooser.getselectedfile().getpath(); 
// label.seticon(new imageicon(name)); 
}

54.删除空文件夹

//import java.io.*; 
file f=new file(%%1); 
if (isfolernull(f)) { 
for (file file :f.listfiles()) { 
if (file.list().length == 0) { 
system.out.println(file.getpath()); 
file.delete(); 
} 
} 
}

55.发送数据到剪贴板

//import java.awt.*; 
//import java.awt.datatransfer.*; 
clipboard clipboard = toolkit.getdefaulttoolkit().getsystemclipboard(); 
transferable ttext = new stringselection(%%1); 
clipboard.setcontents(ttext, null);

56.从剪贴板中取数据

//import java.awt.*; 
//import java.awt.datatransfer.*; 
// 取得系统剪贴板里可传输的数据构造的java对象 
transferable t = toolkit.getdefaulttoolkit() 
.getsystemclipboard().getcontents(null); 
try { 
if (t != null 
&& t.isdataflavorsupported(dataflavor.stringflavor)) { 
// 因为原系的剪贴板里有多种信息, 如文字, 图片, 文件等 
// 先判断开始取得的可传输的数据是不是文字, 如果是, 取得这些文字 
string s = (string) t 
.gettransferdata(dataflavor.stringflavor); 
// 同样, 因为transferable中的dataflavor是多种类型的, 
// 所以传入dataflavor这个参数, 指定要取得哪种类型的data. 
system.out.println(s); 
} 
} catch (unsupportedflavorexception ex) { 
ex.printstacktrace(); 
} catch (ioexception ex) { 
ex.printstacktrace(); 
}

57.获取文件路径的父路径

string %%2=%%1.substring(0,%%1.lastindexof("//"));

58.创建快捷方式

//import java.io.*; 
try { 
printwriter pw=new printwriter(new fileoutputstream("c:/a.bat")); 
pw.println(%%1);"c:/a.txt" 
pw.close(); 
} 
catch(ioexception e){ 
e.printstacktrace(); 
}

59.弹出快捷菜单

//mouseevent e 
jpopupmenu jpm=new jpopupmenu();
show(jpm,x,y);

60.文件夹复制到整合操作

/* 
import java.io.*; 
import java.util.*; 
import javax.swing.*; 
*/ 
jfilechooser jfc = new jfilechooser("请选择源路径"); // 建立选择档案对话 
//方块盒 jfc 
if (!jfc.isfileselectionenabled()) { 
return; 
} 
string %%1 = jfc.getselectedfile().getparent(); 
jfc = new jfilechooser("请选择目标路径"); // 建立选择档案对话方块盒 jfc 
if (!jfc.isfileselectionenabled()) { 
return; 
} 
string %%2 = jfc.getselectedfile().getparent(); 
linkedlist<string> folderlist = new linkedlist<string>(); 
folderlist.add(%%1); 
linkedlist<string> folderlist2 = new linkedlist<string>(); 
folderlist2.add(%%2+ %%1.substring(%%1.lastindexof("//"))); 
while (folderlist.size() > 0) { 
(new file(folderlist2.peek())).mkdirs(); // 如果文件夹不存在 则建立新文件夹 
file folders = new file(folderlist.peek()); 
string[] file = folders.list(); 
file temp = null; 
try { 
for (int i = 0; i < file.length; i++) { 
if (folderlist.peek().endswith(file.separator)) { 
temp = new file(folderlist.peek() + file.separator 
+ file[i]); 
} else { 
temp = new file(folderlist.peek() + file.separator 
+ file[i]); 
} 
if (temp.isfile()) { 
fileinputstream input = new fileinputstream(temp); 
fileoutputstream output = new fileoutputstream( 
folderlist2.peek() + file.separator 
+ (temp.getname()).tostring()); 
byte[] b = new byte[5120]; 
int len; 
while ((len = input.read(b)) != -1) { 
output.write(b, 0, len); 
} 
output.flush(); 
output.close(); 
input.close(); 
} 
if (temp.isdirectory()) {// 如果是子文件夹 
for (file f : temp.listfiles()) { 
if (f.isdirectory()) { 
folderlist.add(f.getpath()); 
folderlist2.add(folderlist2.peek() 
+ file.separator + f.getname()); 
} 
} 
} 
} 
} catch (exception e) { 
//system.out.println("复制整个文件夹内容操作出错"); 
e.printstacktrace(); 
} 
folderlist.removefirst(); 
folderlist2.removefirst(); 
}

61.文件夹移动到整合操作

/* 
import java.io.*; 
import java.util.*; 
import javax.swing.*; 
*/ 
jfilechooser jfc = new jfilechooser("请选择源路径"); // 建立选择档案对话 
//方块盒 jfc 
if (!jfc.isfileselectionenabled()) { 
return; 
} 
string %%1 = jfc.getselectedfile().getparent(); 
jfc = new jfilechooser("请选择目标路径"); // 建立选择档案对话方块盒 jfc 
if (!jfc.isfileselectionenabled()) { 
return; 
} 
string %%2 = jfc.getselectedfile().getparent();

62.目录下所有文件夹复制到整合操作

/* 
import java.io.*; 
import java.util.*; 
import javax.swing.*; 
*/ 
jfilechooser jfc = new jfilechooser("请选择源路径");
// 建立选择档案对话 
//方块盒 jfc 
if (!jfc.isfileselectionenabled()) { 
return; 
} 
string %%1 = jfc.getselectedfile().getparent(); 
jfc = new jfilechooser("请选择目标路径"); // 建立选择档案对话方块盒 jfc 
if (!jfc.isfileselectionenabled()) { 
return; 
} 
string %%2 = jfc.getselectedfile().getparent();

63.目录下所有文件夹移动到整合操作

/* 
import java.io.*; 
import java.util.*; 
import javax.swing.*; 
*/ 
jfilechooser jfc = new jfilechooser("请选择源路径");
// 建立选择档案对话 
//方块盒 jfc 
if (!jfc.isfileselectionenabled()) { 
return; 
} 
string %%1 = jfc.getselectedfile().getparent(); 
jfc = new jfilechooser("请选择目标路径");
// 建立选择档案对话方块盒 jfc 
if (!jfc.isfileselectionenabled()) { 
return; 
} 
string %%2 = jfc.getselectedfile().getparent();

64.目录下所有文件复制到整合操作

/* 
import java.io.*; 
import java.util.*; 
import javax.swing.*; 
*/ 
jfilechooser jfc = new jfilechooser("请选择源路径");
// 建立选择档案对话 
//方块盒 jfc 
if (!jfc.isfileselectionenabled()) { 
return; 
} 
string %%1 = jfc.getselectedfile().getparent(); 
jfc = new jfilechooser("请选择目标路径");
// 建立选择档案对话方块盒 jfc 
if (!jfc.isfileselectionenabled()) { 
return; 
} 
string %%2 = jfc.getselectedfile().getparent();

65.目录下所有文件移动到整合操作

/* 
import java.io.*; 
import java.util.*; 
import javax.swing.*; 
*/ 
jfilechooser jfc = new jfilechooser("请选择源路径");
// 建立选择档案对话 
//方块盒 jfc 
if (!jfc.isfileselectionenabled()) { 
return; 
} 
string %%1 = jfc.getselectedfile().getparent(); 
jfc = new jfilechooser("请选择目标路径");
// 建立选择档案对话方块盒 jfc 
if (!jfc.isfileselectionenabled()) { 
return; 
} 
string %%2 = jfc.getselectedfile().getparent();

66.对目标压缩文件解压缩到指定文件夹

/* 
import java.io.*; 
import java.util.*; 
import javax.swing.*; 
*/

67.创建目录副本整合操作

/* 
import java.io.*; 
import java.util.*; 
import javax.swing.*; 
*/ 
jfilechooser jfc = new jfilechooser("请选择源路径");
// 建立选择档案对话 
方块盒 jfc 
if (!jfc.isfileselectionenabled()) { 
return; 
} 
string %%1 = jfc.getselectedfile().getparent(); 
jfc = new jfilechooser("请选择目标路径");
// 建立选择档案对话方块盒 jfc 
if (!jfc.isfileselectionenabled()) { 
return; 
} 
string %%2 = jfc.getselectedfile().getparent();

68.打开网页

//import java.io.*; 
try{ 
string command = "c://program files//internet explorer//iexplore.exe "+%%1; 
runtime.getruntime().exec(command); 
} catch (ioexception ex) { 
ex.printstacktrace(); 
}

69.删除空文件夹整合操作

/* 
import java.io.*; 
import java.util.*; 
import javax.swing.*; 
*/

70.获取磁盘所有分区后再把光驱盘符去除(用"/0"代替)，把结果放在数组allfenqu[] 中，数组中每
个元素代表一个分区盘符，不包括 :// 这样的路径，allfenqu[]数组开始时存放的是所有盘符。 
当我用这样的代码测试结果是正确的，光驱盘符会被去掉：

string root; //root代表盘符路径 
for(i=0;i<20;i++) //0-20代表最大的盘符数 
{ 
root.format("%c://",allfenqu[i]); 
if(getdrivetype(root)==5) 
allfenqu[i]='/0'; 
} 
但我用这样的代码时结果却无法去掉光驱盘符，allfenqu[]中还是会包含光驱盘符： 
string root; 
for(i=0;i<20;i++) 
{ 
root=allfenqu[i]+"://"; 
if(getdrivetype(root)==5) 
allfenqu[i]='/0'; 
}

71.激活一个程序或程序关联的文件

//import java.io.*; 
try { 
runtime.getruntime().exec(%%1); 
} catch (ioexception e) { 
e.printstacktrace(); 
}

72.http下载

public class downloadcsvfileaction extends action{ 
public actionforward execute(actionmapping mapping, actionform form, 
httpservletrequest request, httpservletresponse response) throws exception { 
try { 
string filename = request.getparameter( "filename "); 
long maid = long.parselong(request.getparameter( "maid ")); 
string filepath = request.getsession().getservletcontext 
().getrealpath( "/ ")+ "csv/ "+maid+ "/ "+filename; 
file fdown = new file(filepath); 
int filelength = integer.parseint(string.valueof 
(fdown.length())); 
//下载类型 
response.setcontenttype( "application/text;charset=gb2312 "); 
response.setheader( "content-dispositon ", "attachment;filename= 
销售详细记录.csv "); //销售详细记录.csv是我想要的下载文件的文件名,但是下载对话框中显 
示的是 downloadcsvfile.do 
response.setcontentlength(filelength); 
byte b[]=new byte[filelength]; 
fileinputstream fi=new fileinputstream(fdown); 
outputstream o=response.getoutputstream(); 
int n = 0; 
while((n=fi.read(b))!=-1) { 
o.write(b,0,n); 
} 
fi.close(); 
o.close(); 
return null; 
}catch (exception e) { 
request.setattribute( "error ", e); 
return mapping.findforward( "error "); 
} 
} 
}

对应的下载类型

private string getcontenttype(string filename) { 
string filenametmp = filename.tolowercase(); 
string ret = ""; 
if (filenametmp.endswith("txt")) { 
ret = "text/plain"; 
} 
if (filenametmp.endswith("gif")) { 
ret = "image/gif"; 
} 
if (filenametmp.endswith("jpg")) { 
ret = "image/jpeg"; 
} 
if (filenametmp.endswith("jpeg")) { 
ret = "image/jpeg"; 
} 
if (filenametmp.endswith("jpe")) { 
ret = "image/jpeg"; 
} 
if (filenametmp.endswith("zip")) { 
ret = "application/zip"; 
} 
if (filenametmp.endswith("rar")) { 
ret = "application/rar"; 
} 
if (filenametmp.endswith("doc")) { 
ret = "application/msword"; 
} 
if (filenametmp.endswith("ppt")) { 
ret = "application/vnd.ms-powerpoint"; 
} 
if (filenametmp.endswith("xls")) { 
ret = "application/vnd.ms-excel"; 
} 
if (filenametmp.endswith("html")) { 
ret = "text/html"; 
} 
if (filenametmp.endswith("htm")) { 
ret = "text/html"; 
} 
if (filenametmp.endswith("tif")) { 
ret = "image/tiff"; 
} 
if (filenametmp.endswith("tiff")) { 
ret = "image/tiff"; 
} 
if (filenametmp.endswith("pdf")) { 
ret = "application/pdf"; 
} 
return ret; 
}

73.ftp下载

/* 
import sun.net.ftp.ftpclient; 
import java.io.*; 
import sun.net.*; 
*/ 
//如果文件在某个目录下，则加入fc.cd("foodir"); 
//比如要下载ftp://ftp.xx.com/index.html则： 
try 
{ 
ftpclient fc=new ftpclient("ftp.xx.com"); 
fc.login("username","888888"); 
int ch; 
file fi = new file("c://index.html"); 
randomaccessfile getfile = new randomaccessfile(fi,"rw"); 
getfile.seek(0); 
telnetinputstream fget=fc.get("index.html"); 
datainputstream puts = new datainputstream(fget); 
while ((ch = puts.read()) >= 0) { 
getfile.write(ch); 
} 
fget.close(); 
getfile.close(); 
fc.closeserver(); 
} 
catch (ioexception ex) 
{ 
ex.printstacktrace(); 
}

74.写图像到剪切板 setclipboardimage

/* 
import java.awt.*; 
import java.awt.datatransfer.*; 
import java.io.*; 
*/ 
private final image image; 
transferable trans = new transferable() { 
public dataflavor[] gettransferdataflavors() { 
return new dataflavor[] { dataflavor.imageflavor }; 
} 
public boolean isdataflavorsupported(dataflavor flavor) { 
return dataflavor.imageflavor.equals(flavor); 
} 
public object gettransferdata(dataflavor flavor) 
throws unsupportedflavorexception, ioexception { 
if (isdataflavorsupported(flavor)) 
return image; 
throw new unsupportedflavorexception(flavor); 
} 
}; 
toolkit.getdefaulttoolkit().getsystemclipboard().setcontents(trans, 
null);

75.从剪贴板复制图像到窗体

76.删除文件夹下的所有文件且不删除文件夹下的文件夹

//import java.io.*; 
//import java.util.*; 
linkedlist<string> folderlist = new linkedlist<string>(); 
folderlist.add(%%1); 
while (folderlist.size() > 0) { 
file file = new file(folderlist.peek()); 
folderlist.removelast(); 
file[] files = file.listfiles(); 
arraylist<file> filelist = new arraylist<file>(); 
for (int i = 0; i < files.length; i++) { 
if (files[i].isdirectory()) { 
folderlist.add(files[i].getpath()); 
} else { 
filelist.add(files[i]); 
} 
} 
for (file f : filelist) { 
f.delete(); 
} 
}

希望本文所述对大家java程序设计有所帮助。