相册管理系统(Java表单+xml数据库存储)
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2024-03-13 09:48:33
功能文件的上传，下载和管理
技术：1.用xml当做数据库存储信息（dom4j，xpath)
2.java表单的文件上传和下载
3.文件目录的打散 （ hash目...
功能文件的上传，下载和管理
技术：1.用xml当做数据库存储信息（dom4j，xpath)
2.java表单的文件上传和下载
3.文件目录的打散 （ hash目录是一种优化文件存储性能的方法）
需要的jar包：
commons-fileupload-1.2.2.jar、commons-io-2.1.jar、dom4j-1.6.1.jar和jaxen-1.1-beta-6.jar
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先写index.jsp
<%@ page language="java" import="java.util.*" pageencoding="utf-8"%> <!doctype html public "-//w3c//dtd html 4.01 transitional//en"> <html> <head> <title>相册管理系统</title> </head> <body> <h1>我的小相册</h1> <a href="jsps/upload.jsp">上传相册</a> <a href="servlets/showservlet">浏览相册</a> </body> </html>
upload.jsp是下载页面放在jsps目录下
<%@ page language="java" import="java.util.*" pageencoding="utf-8"%>
<!doctype html public "-//w3c//dtd html 4.01 transitional//en">
<html>
<head>
</head>
<body>
<h1>相处上传</h1>
<form action="<%=request.getcontextpath()%>/servlets/uploadservlet"
method="post" enctype="multipart/form-data">
文件:<input type="file" name="file1"/><br/>
说明:<input type="text" name="desc" /><br/>
<input type="submit" value="上传" />
</form>
</body>
</html>
photos.xml放在src目录下
<?xml version="1.0" encoding="utf-8"?> <photos> </photos>
在写值对象photomodel
package cn.hncu.demain;
public class photomodel {
private string id;
private string realname;
private string ext;
private string dir;
private string datetime;
private string ip;
private string desc;
public string getid() {
return id;
}
public void setid(string id) {
this.id = id;
}
public string getrealname() {
return realname;
}
public void setrealname(string realname) {
this.realname = realname;
}
public string getext() {
return ext;
}
public void setext(string ext) {
this.ext = ext;
}
public string getdir() {
return dir;
}
public void setdir(string dir) {
this.dir = dir;
}
public string getdatetime() {
return datetime;
}
public void setdatetime(string datetime) {
this.datetime = datetime;
}
public string getip() {
return ip;
}
public void setip(string ip) {
this.ip = ip;
}
public string getdesc() {
return desc;
}
public void setdesc(string desc) {
this.desc = desc;
}
@override
public string tostring() {
return "photomodel [id=" + id + ", realname=" + realname + ", ext="
+ ext + ", dir=" + dir + ", datetime=" + datetime + ", ip="
+ ip + ", desc=" + desc + "]";
}
}
写工具类两个：
myutil（日期格式化，目录打散代码，随机id代码)
package cn.hncu.utils;
import java.text.simpledateformat;
import java.util.date;
import java.util.uuid;
public class myutils {
private myutils() {
}
private static simpledateformat format=new simpledateformat("yyyy年mm月dd日 hh:mm:ss");
public static string getcurrentdatetime(){
return format.format(new date());
}
public static string getuuid(){
uuid uuid=uuid.randomuuid();
string id=uuid.tostring().replaceall("-", "");
return id;
}
public static string getdir(string uuid){
string dir1=integer.tohexstring(uuid.hashcode() & 0xf);
string dir2=integer.tohexstring((uuid.hashcode() & 0xf0)>>4);
return dir1+"/"+dir2;
}
}
dom4jfactory(dom4j的相关操作，获取document对象，保存操作)
package cn.hncu.utils;
import java.io.file;
import java.io.fileinputstream;
import java.io.filenotfoundexception;
import java.io.fileoutputstream;
import java.io.unsupportedencodingexception;
import org.dom4j.document;
import org.dom4j.documentexception;
import org.dom4j.io.outputformat;
import org.dom4j.io.saxreader;
import org.dom4j.io.xmlwriter;
public class dom4jfactory {
private static document dom = null;
private static string path;
static {
try {
saxreader sax = new saxreader();
// 学习一下服务器下的资源路径加载方式(因为我们的资源已经从myeclipse中发布到tomcat服务器中了，所以跟原来纯java项目不一样了)
// 利用当前类找到它的类加载器，然后通过该类加载器再去获得资源路径
path = dom4jfactory.class.getclassloader().getresource("photos.xml")
.getpath();
dom = sax.read(new fileinputstream(path));
} catch (exception e) {
throw new runtimeexception(e.getmessage(), e);
}
}
public static document getdom(){
return dom;
}
public static boolean save(){
try {
outputformat format=new outputformat();
format.setencoding("utf-8");
xmlwriter w = new xmlwriter( new fileoutputstream(new file(path)),format);
w.write(dom);
w.close();
return true;
} catch (exception e) {
return false;
}
}
}
从底层写photodao
package cn.hncu.dao;
import java.util.arraylist;
import java.util.iterator;
import java.util.list;
import org.dom4j.document;
import org.dom4j.element;
import cn.hncu.demain.photomodel;
import cn.hncu.utils.dom4jfactory;
public class photodao {
//添加
public boolean add(photomodel photo){
document dom=dom4jfactory.getdom();
element root=dom.getrootelement();
element ephoto=root.addelement("photo");
ephoto.addattribute("id", photo.getid());
ephoto.addattribute("realname", photo.getrealname());
ephoto.addattribute("dir", photo.getdir());
ephoto.addattribute("ip", photo.getip());
ephoto.addattribute("datetime", photo.getdatetime());
ephoto.addattribute("ext", photo.getext());
ephoto.addelement("desc").settext(photo.getdesc());
boolean boo=dom4jfactory.save();
return boo;
}
//浏览
public list<photomodel> getall(){
document dom=dom4jfactory.getdom();
list<photomodel> list=new arraylist<photomodel>();
element root=dom.getrootelement();
iterator<element> it=root.elementiterator();
while(it.hasnext()){
photomodel photo=new photomodel();
element e=it.next();
photo.setid(e.attributevalue("id"));
photo.setdatetime(e.attributevalue("datetime"));
photo.setdir(e.attributevalue("dir"));
photo.setext(e.attributevalue("ext"));
photo.setip(e.attributevalue("ip"));
photo.setrealname(e.attributevalue("realname"));
photo.setdesc(e.elementtext("desc"));
list.add(photo);
}
return list;
}
public photomodel getsinglebyid(string id) {
document dom=dom4jfactory.getdom();
list<photomodel> list=getall();
for(photomodel photo:list){
if(photo.getid().equals(id)){
return photo;
}
}
return null;
}
public boolean del(string id) {
document dom=dom4jfactory.getdom();
element e=(element) dom.selectsinglenode("//photo[@id='"+id.trim()+"']");
return e.getparent().remove(e);
}
}
最后写四个servlet
uploadservlet 上传servlet代码
package cn.hncu.servlets;
import java.io.file;
import java.io.ioexception;
import java.io.inputstream;
import java.io.printwriter;
import java.util.list;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import org.apache.commons.fileupload.fileitem;
import org.apache.commons.fileupload.fileuploadexception;
import org.apache.commons.fileupload.disk.diskfileitemfactory;
import org.apache.commons.fileupload.servlet.servletfileupload;
import org.apache.commons.io.fileutils;
import cn.hncu.dao.photodao;
import cn.hncu.demain.photomodel;
import cn.hncu.utils.myutils;
public class uploadservlet extends httpservlet {
public void doget(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
response.setcontenttype("text/html;charset=utf-8");
printwriter out = response.getwriter();
out.println("<!doctype html public \"-//w3c//dtd html 4.01 transitional//en\">");
out.println("<html>");
out.println(" <head><title>a servlet</title></head>");
out.println(" <body>");
out.println("不支持get方式上传!");
out.println(" </body>");
out.println("</html>");
out.flush();
out.close();
}
public void dopost(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
response.setcontenttype("text/html;charset=utf-8");
printwriter out = response.getwriter();
string path=request.getservletcontext().getrealpath("/photos");
diskfileitemfactory factory=new diskfileitemfactory();
factory.setrepository(new file("g:/a"));
servletfileupload upload = new servletfileupload(factory);
upload.setsizemax(1024*1024*10);//最大10m
upload.setheaderencoding("utf-8");//用于设置文件名的编码，相当于：request.setcharacterencoding("utf-8");
fileitem fi=null;
try {
list<fileitem> list=upload.parserequest(request);
photomodel photo = new photomodel();//数据封装---需要7个属性
boolean boo=false;
inputstream in = null;
for(fileitem fi2:list){
fi=fi2;
if(fi.isformfield()){
string desc=fi.getstring("utf-8");
photo.setdesc(desc);//desc
}else{
in=fi.getinputstream();
string realname=fi.getname();
if(realname==null || realname.trim().equals("")){
out.print("没有选择文件!");
return;
}
if(realname.indexof("\\")!=-1){
realname=realname.substring(realname.lastindexof("\\")+1);
}
photo.setrealname(realname);//真实文件名
string ext=realname.substring(realname.lastindexof("."));
photo.setext(ext);//3
photo.setdatetime(myutils.getcurrentdatetime());//4
photo.setid(myutils.getuuid());//5
photo.setdir(myutils.getdir(photo.getid()));//6
photo.setip(request.getremoteaddr());//7
}
}
//把相片信息存储到数据库
photodao dao=new photodao();
boo=dao.add(photo);
//如果上面的相片信息保存成功，那么才开始接收图片文件，把它保存到服务器硬盘
if(boo){
system.out.println(dao);
path=path+"/"+photo.getdir();
file dir=new file(path);
if(!dir.exists()){
dir.mkdirs();
}
string filename=path+"/"+photo.getid()+photo.getext();
fileutils.copyinputstreamtofile(in, new file(filename));
string strpath = request.getcontextpath()+"/servlets/showservlet";
out.print("上传成功!<a href='"+strpath+"'>浏览相册</a>");
}else{
out.print("上传失败!");
}
} catch (fileuploadexception e) {
throw new runtimeexception("上传失败！", e);
}finally{
if(fi!=null){
fi.delete();
}
}
out.flush();
out.close();
}
}
showservlet 浏览相册的servlet端
package cn.hncu.servlets;
import java.io.ioexception;
import java.io.printwriter;
import java.util.list;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import cn.hncu.dao.photodao;
import cn.hncu.demain.photomodel;
public class showservlet extends httpservlet {
ioexception if an error occurred
public void doget(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
dopost(request, response);
}
public void dopost(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
response.setcontenttype("text/html;charset=utf-8");
request.setcharacterencoding("utf-8");
printwriter out = response.getwriter();
out.println("<!doctype html public \"-//w3c//dtd html 4.01 transitional//en\">");
out.println("<html>");
out.println(" <head><title>a servlet</title></head>");
out.println(" <body>");
string table="<table border='1' width='100%'>"+
"<tr><th>文件名</th><th>上传ip</th><th>上传时间</th><th>图片</th><th>说明</th><th>操作</th></tr>"
;
out.print(table);
photodao dao=new photodao();
list<photomodel> list=dao.getall();
for(photomodel p:list){
out.print("<tr>");
out.println("<td>"+p.getrealname()+"</td>");
out.println("<td>"+p.getip()+"</td>");
out.println("<td>"+p.getdatetime()+"</td>");
//输出图片
string path=request.getcontextpath()+"/photos/"+p.getdir()+"/"+p.getid()+p.getext();
out.println("<td><a href='"+path+"'><img src='"+path+"' width='200' height='200'></img></a></td>");
string op="<a href='"+request.getcontextpath()+"/servlets/delservlet?id="+p.getid()+"'>删除</a> ";
out.println("<td>"+p.getdesc()+"</td>");
op+="<a href='"+request.getcontextpath()+"/servlets/downservlet?id="+p.getid()+"'>下载</a>";
out.println("<td>"+op+"</td>");
out.print("</tr>");
}
out.println("</table>");
out.println(" </body>");
out.println("</html>");
out.flush();
out.close();
}
}
downservlet 下载的服务器代码
package cn.hncu.servlets;
import java.io.fileinputstream;
import java.io.fileoutputstream;
import java.io.ioexception;
import java.io.inputstream;
import java.io.outputstream;
import java.io.printwriter;
import java.net.urlencoder;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import cn.hncu.dao.photodao;
import cn.hncu.demain.photomodel;
public class downservlet extends httpservlet {
public void doget(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
dopost(request, response);
}
public void dopost(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
string id=request.getparameter("id");
response.setcontenttype("application/force-download");
photomodel p=new photodao().getsinglebyid(id);
if(p!=null){
string realname=p.getrealname();
realname=new string(realname.getbytes("iso8859-1"),"utf-8");
response.setheader("content-disposition", "attachment;filename=\""+realname+"\"");
string relpath=getservletcontext().getrealpath("/photos/"+p.getdir()+"/"+p.getid()+p.getext());
inputstream in=new fileinputstream(relpath);
outputstream out=response.getoutputstream();
system.out.println(relpath);
byte buf[]=new byte[1024];
int len=0;
while ((len=in.read(buf))!=-1){
out.write(buf,0,len);
}
out.close();
}else{
response.setcontenttype("text/html;charset=utf-8");
response.getwriter().println("该文件已经被删除!");
}
}
}
delservlet 删除操作的服务器
package cn.hncu.servlets;
import java.io.file;
import java.io.fileinputstream;
import java.io.ioexception;
import java.io.inputstream;
import java.io.outputstream;
import java.io.printwriter;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import cn.hncu.dao.photodao;
import cn.hncu.demain.photomodel;
public class delservlet extends httpservlet {
public void doget(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
dopost(request, response);
}
public void dopost(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
request.setcharacterencoding("utf-8");
response.setcontenttype("text/html;charset=utf-8");
printwriter out=response.getwriter();
string id=request.getparameter("id");
photomodel p=new photodao().getsinglebyid(id);
if(p!=null){
if(!p.getip().equals(request.getremoteaddr())){
out.println("你无权进行删除！");
return;
}
//※※※※以下部分课后补敲的!!!!
//1删除数据库中的信息
photodao dao=new photodao();
boolean boo=dao.del(id);
//2把服务器硬盘中的文件删除
if(boo){
string filename="photos/"+p.getdir()+"/"+p.getid()+p.getext();
string pathfilename = getservletcontext().getrealpath(filename);
file f=new file(pathfilename);
if(f.exists()){
f.delete();
}
string strpath = request.getcontextpath()+"/servlets/showservlet";
out.println("相片删除成功!<a href='"+strpath+"'>浏览相册</a>");
}else{
out.println("相片删除失败!");
}
}else{
response.setcontenttype("text/html;charset=utf-8");
response.getwriter().println("该文件不存在!");
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。