java 解压zip 中文问题完美解决

用过java做压缩或解压的都知道，jdk提供的zip只能按UTF-8格式处理，前些天写过一篇压缩zip的中文问题，就是使用ant包里的类，并且在linux上稍做些修改也能兼容，但是，如果是解压一个包含中文文件名的zip包呢？ 此时如果使用jdk自带的zip包，解压时如果文件名有中文，会抱非法参数异常，而如果使用ant包。会发现ant.jar里并没有ZipInputStream，怎么办？
看来，我们还是得使用jdk里的zip包了，我们的问题仅仅是需要支持GBK,所以修改应该不会很大，所以我们先找出所有相关的类,以下类请自行从jdk的src.zip里提取

DeflaterOutputStream.java
InflaterInputStream.java
ZipConstants.java
ZipEntry.java
ZipInputStream.java
ZipOutputStream.java

以上java文件我已打包在附件中.

前面不是说ant.jar里并没有ZipInputStream.java嘛，这里需要修改的正是这个类，找到getUTF8String()方法，。（这里要汗一个，。sun是怎么想的，连方法名都规定死了是UTF-8），在这个方法里的所有代码前加上如下:

 try
        {
            String s = new String(b, off, len, "GBK");//以GBK的方式
            return s;
        }
        catch (UnsupportedEncodingException e)
        {
            e.printStackTrace();
        }

此时就完成以GBK方式操作，但是此时我们在解压时，还会发现问题，报如下异常:

Exception in thread "main" java.lang.UnsatisfiedLinkError: com.zwl.zip.ZipEntry.initIDs()V
	at com.zwl.zip.ZipEntry.initIDs(Native Method)
	at com.zwl.zip.ZipEntry.<clinit>(ZipEntry.java:41)
	at com.zwl.zip.ZipInputStream.createZipEntry(ZipInputStream.java:389)
	at com.zwl.zip.ZipInputStream.readLOC(ZipInputStream.java:251)
	at com.zwl.zip.ZipInputStream.getNextEntry(ZipInputStream.java:78)
	at com.conngame.test.TestZip.unzip(TestZip.java:41)
	at com.conngame.test.TestZip.main(TestZip.java:100)

initIDs（）方法是在ZipEntry类的static里调用的，目前还不大清楚这个到底做什么用，我们只需要在ZipEntry类中找到这个static模块，注释掉就行了,

 static
    {
        /* Zip library is loaded from System.initializeSystemClass */
        initIDs();
    }

找到以上代码注释掉.此时解压，OK，能完美支持中文

附上测试代码:

package com.conngame.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import com.zwl.zip.ZipEntry;
import com.zwl.zip.ZipInputStream;
import com.zwl.zip.ZipOutputStream;

/**
 * TestZip.java coding by Serol Luo. rollingpig@163.com 2003/07/03
 * http://www.chinaunix.net/forum/viewforum.php?f=26 转载请保留此信息
 */

class TestZip
{
    public void zip(String zipFileName, String inputFile) throws Exception
    {
        zip(zipFileName, new File(inputFile));
    }
    public void zip(String zipFileName, File inputFile) throws Exception
    {
        ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
                zipFileName));
        zip(out, inputFile, "");
        System.out.println("zip done");
        out.close();
    }

    public void unzip(String zipFileName, String outputDirectory)
            throws Exception
    {
        ZipInputStream in = new ZipInputStream(new FileInputStream(zipFileName));
        ZipEntry z;

//        System.out.println("z = in.getNextEntry(): "+((z=in.getNextEntry())!=null));



        while ((z=in.getNextEntry())!=null)
        {
            System.out.println("unziping " + z.getName());
            if (z.isDirectory())
            {
                String name = z.getName();
                name = name.substring(0, name.length() - 1);
                File f = new File(outputDirectory + File.separator + name);
                f.mkdir();
                System.out.println("mkdir " + outputDirectory + File.separator
                        + name);
            }
            else
            {
                File f = new File(outputDirectory + File.separator
                        + z.getName());
                f.createNewFile();
                System.out.println("f:" +f);
                FileOutputStream out = new FileOutputStream(f);
                int b;
                while ((b = in.read()) != -1)
                    out.write(b);
                out.close();
            }
        }

        in.close();
    }

    public void zip(ZipOutputStream out, File f, String base) throws Exception
    {
        System.out.println("Zipping  " + f.getName());
        if (f.isDirectory())
        {
            File[] fl = f.listFiles();
            out.putNextEntry(new 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 ZipEntry(base));
            FileInputStream in = new FileInputStream(f);
            int b;
            while ((b = in.read()) != -1)
                out.write(b);
            in.close();
        }

    }
    public static void main(String[] args)
    {
        try
        {
            TestZip t = new TestZip();
            t.unzip("D:\\program\\servers\\apache-tomcat-6.0.9\\apache-tomcat-6.0.9\\webapps\\Manage\\xxx.zip", "D:\\program\\servers\\apache-tomcat-6.0.9\\apache-tomcat-6.0.9\\webapps\\Manage\\");
        }
        catch (Exception e)
        {
            e.printStackTrace(System.out);
        }
    }
}