java实现多个文件压缩成压缩包

本文实例为大家分享了java实现多个文件压缩的具体代码，供大家参考，具体内容如下

需要用到的ant.jar

package util;

import java.io.bufferedinputstream;
import java.io.bufferedoutputstream;
import java.io.file;
import java.io.fileinputstream;
import java.io.fileoutputstream;
import java.io.inputstream;
import java.io.outputstream;
import java.util.arraylist;
import java.util.enumeration;
import java.util.list;
import java.util.zip.zipentry;
import java.util.zip.zipfile;
import java.util.zip.zipoutputstream;


public class ziptools { 

  public static final string zip_filename = ""; //需要解压缩的文件名 
  public static final string zip_dir = "";  //需要压缩的文件夹 
  public static final string un_zip_dir = "";  //要解压的文件目录 
  public static final int buffer = 1024 ;  //缓存大小 

public static void zipfile(string basedir,string filename) throws exception{ 
    list filelist=getsubfiles(new file(basedir)); 
    zipoutputstream zos=new zipoutputstream(new fileoutputstream(filename)); 
    zipentry ze=null; 
    byte[] buf=new byte[buffer]; 
    int readlen=0; 
    for(int i = 0; i <filelist.size(); i++) { 
      file f=(file)filelist.get(i); 
      ze=new zipentry(getabsfilename(basedir, f)); 
      ze.setsize(f.length()); 
      ze.settime(f.lastmodified());   
      zos.putnextentry(ze); 
      inputstream is=new bufferedinputstream(new fileinputstream(f)); 
      while ((readlen=is.read(buf, 0, buffer))!=-1) { 
        zos.write(buf, 0, readlen); 
      } 
      is.close(); 
    } 
    zos.close(); 
  } 


private static string getabsfilename(string basedir, file realfilename){ 
    file real=realfilename; 
    file base=new file(basedir); 
    string ret=real.getname(); 
    while (true) { 
      real=real.getparentfile(); 
      if(real==null)  
        break; 
      if(real.equals(base))  
        break; 
      else 
        ret=real.getname()+"/"+ret; 
    } 
    return ret; 
  } 

private static list getsubfiles(file basedir){ 
    list ret=new arraylist(); 
    file[] tmp=basedir.listfiles(); 
    for (int i = 0; i <tmp.length; i++) { 
      if(tmp[i].isfile()) 
        ret.add(tmp[i]); 
      if(tmp[i].isdirectory()) 
        ret.addall(getsubfiles(tmp[i])); 
    } 
    return ret; 
  } 

public static void upzipfile() throws exception{ 
    zipfile zfile=new zipfile(zip_filename); 
    enumeration zlist=zfile.entries(); 
    zipentry ze=null; 
    byte[] buf=new byte[1024]; 
    while(zlist.hasmoreelements()){ 
      ze=(zipentry)zlist.nextelement();     
      if(ze.isdirectory()){ 
        file f=new file(zip_dir+ze.getname()); 
        f.mkdir(); 
        continue; 
      } 
      outputstream os=new bufferedoutputstream(new fileoutputstream(getrealfilename(zip_dir, ze.getname()))); 
      inputstream is=new bufferedinputstream(zfile.getinputstream(ze)); 
      int readlen=0; 
      while ((readlen=is.read(buf, 0, 1024))!=-1) { 
        os.write(buf, 0, readlen); 
      } 
      is.close(); 
      os.close();  
    } 
    zfile.close(); 
  } 

public static file getrealfilename(string basedir, string absfilename){ 
    string[] dirs=absfilename.split("/"); 
    file ret=new file(basedir); 
    if(dirs.length>1){ 
      for (int i = 0; i < dirs.length-1;i++) { 
        ret=new file(ret, dirs[i]); 
      } 
      if(!ret.exists()) 
        ret.mkdirs(); 
      ret=new file(ret, dirs[dirs.length-1]); 
      return ret; 
    } 
    return ret; 
  } 

public static void deletedirfile(string path){
   file file=new file(path);
   if(file.isdirectory()){    //如果是目录，先递归删除
     string[] list=file.list();
     for(int i=0;i<list.length;i++){
     deletedirfile(path+"\\"+list[i]); //先删除目录下的文件
     }
   }    
   file.delete();
 }


public static string newfolder(string dir){
 java.io.file myfilepath=new java.io.file(dir);
 if(myfilepath.isdirectory()){}else{
  myfilepath.mkdirs();
 }
 return dir;
 }

public static string getfilenames(string path){  

    file file = new file(path);      // get file list where the path has
    file[] array = file.listfiles();     // 获得文件列表 
    string pdfnames="";

    for(int i=0;i<array.length;i++){  
      if(array[i].isfile()){  
        if(array[i].getname().endswith(".pdf")){  //获得pdf文件名称
         pdfnames+=array[i].getname().substring(0,array[i].getname().length()-4)+",";
        }
      } 
    }
    if(pdfnames.length()>0){
     pdfnames.substring(0,pdfnames.length()-1);
    }
    return pdfnames;
  }

public static void copyfile(string oldpath, string newpath) {
    try {
      int bytesum = 0;
      int byteread = 0;
      file oldfile = new file(oldpath);
      if (oldfile.exists()) {     //文件存在时
        inputstream instream = new fileinputstream(oldpath); //读入原文件
        fileoutputstream fs = new fileoutputstream(newpath);
        byte[] buffer = new byte[1444];
        while ( (byteread = instream.read(buffer)) != -1) {
          bytesum += byteread;    //字节数文件大小
          fs.write(buffer, 0, byteread);
        }
        instream.close();
      }
    }
    catch (exception e) {
      system.out.println("copy file error!");
      e.printstacktrace();
    }
  }

public static boolean fileexist(string filenames,string pdfname){
 boolean flag=false;
 if(!"".equals(filenames)){
  string[] namearr=filenames.split(",");
  for(int i=0;i<namearr.length;i++){
  if(pdfname.equals(namearr[i])){    //如果文件名相同则执行拷贝操作(拷贝到zip目录准备打包)
   flag=true;
   break;
  }
  }
 }
 return flag;
 }

public static void deletefileanddir(string path){
  file file = new file(path);  
     file[] array = file.listfiles(); 
     for(int i=0;i<array.length;i++){  
       if(array[i].isfile()){
         array[i].delete();
       }else if(array[i].isdirectory()){  
       deletedirfile(array[i].getpath()); 
       }  
     }  
 }

}

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。