Java 实现文件压缩工具类

 package com.wdxc.util;
 import java.io.BufferedInputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.util.zip.CRC32;
 import java.util.zip.CheckedOutputStream;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipOutputStream;

 import org.apache.log4j.Logger;

 /**
  * zip文件压缩工具类
  *
  * @author : wangbo
  */
 public class ZipCompressor {
     private Logger logger = Logger.getLogger(ZipCompressor.class);
     static final int BUFFER = 8192;
     private File zipFile;  

     /**
      * 压缩文件构造函数
      * @param pathName 压缩的文件存放目录
      */
     public ZipCompressor(String pathName) {
         zipFile = new File(pathName);
     }  

     /**
      * 执行压缩操作
      * @param srcPathName 被压缩的文件/文件夹
      */
     public void compressExe(String srcPathName) {
         File file = new File(srcPathName);
         if (!file.exists()){
             throw new RuntimeException(srcPathName + "不存在！");
         }
         try {
             FileOutputStream fileOutputStream = new FileOutputStream(zipFile);
             CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream,new CRC32());
             ZipOutputStream out = new ZipOutputStream(cos);

             String basedir = "";
             compressByType(file, out, basedir);
             out.close();
         } catch (Exception e) {
             e.printStackTrace();
             logger.error("执行压缩操作时发生异常:"+e);
             throw new RuntimeException(e);
         }
     }  

     /**
      * 判断是目录还是文件，根据类型（文件/文件夹）执行不同的压缩方法
      * @param file
      * @param out
      * @param basedir
      */
     private void compressByType(File file, ZipOutputStream out, String basedir) {
         /* 判断是目录还是文件 */
         if (file.isDirectory()) {
             logger.info("压缩：" + basedir + file.getName());
             this.compressDirectory(file, out, basedir);
         } else {
             logger.info("压缩：" + basedir + file.getName());
             this.compressFile(file, out, basedir);
         }
     }  

     /**
      * 压缩一个目录
      * @param dir
      * @param out
      * @param basedir
      */
     private void compressDirectory(File dir, ZipOutputStream out, String basedir) {
         if (!dir.exists()){
              return;
         }

         File[] files = dir.listFiles();
         for (int i = 0; i < files.length; i++) {
             /* 递归 */
             compressByType(files[i], out, basedir + dir.getName() + "/");
         }
     }  

     /**
      * 压缩一个文件
      * @param file
      * @param out
      * @param basedir
      */
     private void compressFile(File file, ZipOutputStream out, String basedir) {
         if (!file.exists()) {
             return;
         }
         try {
             BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
             ZipEntry entry = new ZipEntry(basedir + file.getName());
             out.putNextEntry(entry);
             int count;
             byte data[] = new byte[BUFFER];
             while ((count = bis.read(data, 0, BUFFER)) != -1) {
                 out.write(data, 0, count);
             }
             bis.close();
         } catch (Exception e) {
             throw new RuntimeException(e);
         }
     }  

     public static void main(String[] args) {
         ZipCompressor zc = new  ZipCompressor("E:\\szhzip.zip");
         zc.compressExe("E:\\ftpdown");  

     }
 }