以下是本人编写的关于解压zip文件的类，解决了中文问题及提高了解压的速度．希望对大家有所帮助，如果觉的好，请给我投一票，如果有什么更好方法，请通知我 ,谢谢．

import java.io.*;
import java.util.*;
import java.util.zip.*;
import sun.io.*;

public class linzip
{
 public static string make8859togb(string str)
 {
  try{
   string str8859 = new string(str.getbytes("8859_1"),"gb2312");
   return str8859;
  }catch(unsupportedencodingexception ioe){
   return str;
  }
 }
 
 public static void main(string[] args)
 {
  if (args.length < 1){
   system.err.println("required parameter missing!");
   system.exit(-1);
  }
  
  
  file infile = new file(args[0]);

  try{
   //检查是否是zip文件
   zipfile zip = new zipfile(infile);
   zip.close();
   
   //建立与目标文件的输入连接
   zipinputstream in = new zipinputstream(new fileinputstream(infile));
   zipentry file = in.getnextentry();
   
     
   int i =infile.getabsolutepath().lastindexof('.');
   string dirname = new string();
   if ( i != -1 )
    dirname = infile.getabsolutepath().substring(0,i);
   else
    dirname = infile.getabsolutepath();
   file newdir = new file(dirname);
   newdir.mkdir();
   
   byte[] c = new byte[1024];
   int len;
   int slen;
   
   while (file != null){
    
    i = make8859togb(file.getname()).replace('/','/').lastindexof('/');
    if ( i != -1 ){
     file dirs = new file(dirname+file.separator+make8859togb(file.getname()).replace('/','/').substring(0,i));
     dirs.mkdirs();
     dirs = null;
    }
    
    system.out.print("extract "+make8859togb(file.getname()).replace('/','/')+" ........  ");
    
    if (file.isdirectory()){
     file dirs = new file(make8859togb(file.getname()).replace('/','/'));
     dirs.mkdir();
     dirs = null;
    }
    else{ 
     fileoutputstream out = new fileoutputstream(dirname+file.separator+make8859togb(file.getname()).replace('/','/'));
     while((slen = in.read(c,0,c.length)) != -1)
      out.write(c,0,slen);
     out.close();
    }
    system.out.print("o.k.");
    file = in.getnextentry();
   }
   in.close();
  }catch(zipexception zipe){
   messagebox(0,infile.getname()+"不是一个zip文件！","文件格式错误",16);
  }catch(ioexception ioe){
   messagebox(0,"读取"+args[0]+"时错误！","文件读取错误",16);
  }catch(exception i){
    system.out.println("over");
  }
 }

 /**
  * @dll.import("user32", auto)
  */
 public static native int messagebox(int hwnd, string lptext, string lpcaption, int utype);
}

以上程序在win98&vj6.0测试通过．本人e-mail: lsf82@citiz.net