java 解压压缩包 示例源码

【核心代码】

package com.sz.jieya;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipFile;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;


public class UnCompressFile {
 private static UnCompressFile instance = new UnCompressFile();
 private UnCompressFile() {
 }
 public static UnCompressFile getInstance() {
  return instance;
 }

 /**
  * 解压zip或者rar包的内容到指定的目录下，可以处理其文件夹下包含子文件夹的情况
  *
  * @param zipFilename
  *            要解压的zip或者rar包文件
  * @param outputDirectory
  *            解压后存放的目录
  */
 public synchronized void unzip(String zipFilename, String outputDirectory)
   throws IOException {
  File outFile = new File(outputDirectory);
  if (!outFile.exists()) {
   outFile.mkdirs();
  }
  ZipFile zipFile = new ZipFile(zipFilename);
  Enumeration en = zipFile.getEntries();
  ZipEntry zipEntry = null;
  while (en.hasMoreElements()) {
   zipEntry = (ZipEntry) en.nextElement();
   if (zipEntry.isDirectory()) {
    // mkdir directory
    String dirName = zipEntry.getName();
    //System.out.println("=dirName is:="   dirName   "=end=");
    dirName = dirName.substring(0, dirName.length() - 1);
    File f = new File(outFile.getPath()   File.separator   dirName);
    f.mkdirs();
   } else {
    //unzip file
    String strFilePath = outFile.getPath()   File.separator
        zipEntry.getName();
    File f = new File(strFilePath);
    //the codes remedified by can_do on 2010-07-02 =begin=
    // /////begin/////
    //判断文件不存在的话，就创建该文件所在文件夹的目录
    if (!f.exists()) {
     String[] arrFolderName = zipEntry.getName().split("/");
     String strRealFolder = "";
     for (int i = 0; i < (arrFolderName.length - 1); i  ) {
      strRealFolder  = arrFolderName[i]   File.separator;
     }
     strRealFolder = outFile.getPath()   File.separator
         strRealFolder;
     File tempDir = new File(strRealFolder);
     //此处使用.mkdirs()方法，而不能用.mkdir()
     tempDir.mkdirs();
    }
    //////end///
    // the codes remedified by can_do on 2010-07-02 =end=
    f.createNewFile();
    InputStream in = zipFile.getInputStream(zipEntry);
    FileOutputStream out = new FileOutputStream(f);
    try {
     int c;
     byte[] by = new byte[BUFFEREDSIZE];
     while ((c = in.read(by)) != -1) {
      out.write(by, 0, c);
     }
     //out.flush();
    } catch (IOException e) {
     throw e;
    } finally {
     out.close();
     in.close();
    }
   }
  }
 }
 private static final int BUFFEREDSIZE = 1024;
 public static void main(String[] args) {
  UnCompressFile bean = new UnCompressFile();
  try {
   bean.unzip("d:/test.zip", "D:/test22");
   
   //bean.unzip("d:/struts.rar", "D:/struts");
  } catch (IOException e) {
   e.printStackTrace();
  }
 }//必须右键文件添加成为zip才行 手动修改后缀名无效
}