java 解压缩zip

package com.utility.zip;

 

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.zip.ZipEntry;

import java.util.zip.ZipInputStream;

import java.util.zip.ZipOutputStream;

 

import com.utility.io.IOUtil;

 

/**

  * 通过Java的Zip输入输出流实现压缩和解压文件

  *

  * @author liujiduo

  *

  */

public final class ZipUtil {

 

     private ZipUtil() {

         // empty

     }

 

     /**

      * 压缩文件

      *

      * @param filePath

      *            待压缩的文件路径

      * @return 压缩后的文件

      */

     public static File zip(String filePath) {

         File target = null ;

         File source = new File(filePath);

         if (source.exists()) {

             // 压缩文件名=源文件名.zip

             String zipName = source.getName() + ".zip" ;

             target = new File(source.getParent(), zipName);

             if (target.exists()) {

                 target.delete(); // 删除旧的文件

             }

             FileOutputStream fos = null ;

             ZipOutputStream zos = null ;

             try {

                 fos = new FileOutputStream(target);

                 zos = new ZipOutputStream( new BufferedOutputStream(fos));

                 // 添加对应的文件Entry

                 addEntry( "/" , source, zos);

             } catch (IOException e) {

                 throw new RuntimeException(e);

             } finally {

                 IOUtil.closeQuietly(zos, fos);

             }

         }

         return target;

     }

 

     /**

      * 扫描添加文件Entry

      *

      * @param base

      *            基路径

      *

      * @param source

      *            源文件

      * @param zos

      *            Zip文件输出流

      * @throws IOException

      */

     private static void addEntry(String base, File source, ZipOutputStream zos)

             throws IOException {

         // 按目录分级，形如：/aaa/bbb.txt

         String entry = base + source.getName();

         if (source.isDirectory()) {

             for (File file : source.listFiles()) {

                 // 递归列出目录下的所有文件，添加文件Entry

                 addEntry(entry + "/" , file, zos);

             }

         } else {

             FileInputStream fis = null ;

             BufferedInputStream bis = null ;

             try {

                 byte [] buffer = new byte [ 1024 * 10 ];

                 fis = new FileInputStream(source);

                 bis = new BufferedInputStream(fis, buffer.length);

                 int read = 0 ;

                 zos.putNextEntry( new ZipEntry(entry));

                 while ((read = bis.read(buffer, 0 , buffer.length)) != - 1 ) {

                     zos.write(buffer, 0 , read);

                 }

                 zos.closeEntry();

             } finally {

                 IOUtil.closeQuietly(bis, fis);

             }

         }

     }

 

     /**

      * 解压文件

      *

      * @param filePath

      *            压缩文件路径

      */

     public static void unzip(String filePath) {

         File source = new File(filePath);

         if (source.exists()) {

             ZipInputStream zis = null ;

             BufferedOutputStream bos = null ;

             try {

                 zis = new ZipInputStream( new FileInputStream(source));

                 ZipEntry entry = null ;

                 while ((entry = zis.getNextEntry()) != null

                         && !entry.isDirectory()) {

                     File target = new File(source.getParent(), entry.getName());

                     if (!target.getParentFile().exists()) {

                         // 创建文件父目录

                         target.getParentFile().mkdirs();

                     }

                     // 写入文件

                     bos = new BufferedOutputStream( new FileOutputStream(target));

                     int read = 0 ;

                     byte [] buffer = new byte [ 1024 * 10 ];

                     while ((read = zis.read(buffer, 0 , buffer.length)) != - 1 ) {

                         bos.write(buffer, 0 , read);

                     }

                     bos.flush();

                 }

                 zis.closeEntry();

             } catch (IOException e) {

                 throw new RuntimeException(e);

             } finally {

                 IOUtil.closeQuietly(zis, bos);

             }

         }

     }

 

     public static void main(String[] args) {

         String targetPath = "E:\\Win7壁纸" ;

         File file = ZipUtil.zip(targetPath);

         System.out.println(file);

         ZipUtil.unzip( "F:\\Win7壁纸.zip" );

     }

}