利用java的ZipOutputStream类解压文件或文件夹中的文件

package com.util;

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.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

public class MyWar {
public void war (String fileName) throws IOException{
Runtime.getRuntime().exec("jar cvf" + " " + fileName);
}

    /**
     * zip压缩功能测试. 将d:\\temp\\zipout目录下的所有文件连同子目录压缩到d:\\temp\\out.zip.
     *
     * @param baseDir 所要压缩的目录名（包含绝对路径）
     * @param objFileName 压缩后的文件名
     * @throws Exception
     */
    public void createZip(String baseDir, String objFileName) throws Exception {
            File folderObject = new File(baseDir);

            if (folderObject.exists()){
                    List fileList = getSubFiles(new File(baseDir));

                    //压缩文件名
                    ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(objFileName));

                    ZipEntry ze = null;
                    byte[] buf = new byte[1024];
                    int readLen = 0;
                    for (int i = 0; i < fileList.size(); i++) {
                            File f = (File) fileList.get(i);
                            System.out.println("Adding: " + f.getPath() + f.getName());

                            //创建一个ZipEntry，并设置Name和其它的一些属性
                            ze = new ZipEntry(getAbsFileName(baseDir, f));
                            ze.setSize(f.length());
                            ze.setTime(f.lastModified());

                            //将ZipEntry加到zos中，再写入实际的文件内容
                            zos.putNextEntry(ze);
                            InputStream is = new BufferedInputStream(new FileInputStream(f));
                            while ((readLen = is.read(buf, 0, 1024)) != -1) {
                                    zos.write(buf, 0, readLen);
                            }
                            is.close();
                            System.out.println("done...");
                    }
                    zos.close();
            }else{
                    throw new Exception("this folder isnot exist!");
            }
    }
   
    /**
     * 给定根目录，返回一个相对路径所对应的实际文件名.
     *
     * @param baseDir
     *            指定根目录
     * @param absFileName
     *            相对路径名，来自于ZipEntry中的name
     * @return java.io.File 实际的文件
     */
    private File getRealFileName(String baseDir, String absFileName) {
            String[] dirs = absFileName.split("/");
            //System.out.println(dirs.length);
            File ret = new File(baseDir);
            //System.out.println(ret);
            if (dirs.length > 1) {
                    for (int i = 0; i < dirs.length - 1; i++) {
                            ret = new File(ret, dirs[i]);
                    }
            }
            if (!ret.exists()) {
                    ret.mkdirs();
            }
            ret = new File(ret, dirs[dirs.length - 1]);
            return ret;
    }

    /**
     * 给定根目录，返回另一个文件名的相对路径，用于zip文件中的路径.
     *
     * @param baseDir
     *            java.lang.String 根目录
     * @param realFileName
     *            java.io.File 实际的文件名
     * @return 相对文件名
     */
    private String getAbsFileName(String baseDir, File realFileName) {
            File real = realFileName;
            File base = new File(baseDir);
            String ret = real.getName();
            while (true) {
                    real = real.getParentFile();
                    if (real == null)
                            break;
                    if (real.equals(base))
                            break;
                    else {
                            ret = real.getName() + "/" + ret;
                    }
            }
            System.out.println("TTTTT" + ret);
            return ret;
    }

   
    /**
     * 取得指定目录下的所有文件列表，包括子目录.
     *
     * @param baseDir
     *            File 指定的目录
     * @return 包含java.io.File的List
     */
    private List getSubFiles(File baseDir) {
            List ret = new ArrayList();
            //File base=new File(baseDir);
            File[] tmp = baseDir.listFiles();
            for (int i = 0; i < tmp.length; i++) {
                    if (tmp[i].isFile()) {
                            ret.add(tmp[i]);
                    }
                    if (tmp[i].isDirectory()) {
                            ret.addAll(getSubFiles(tmp[i]));
                    }
            }
            return ret;
    }
   
    /**
     * zip压缩功能测试. 将指定文件压缩后存到一压缩文件中
     *
     * @param baseDir 所要压缩的文件名
     * @param objFileName 压缩后的文件名
     * @return 压缩后文件的大小
     * @throws Exception
     */
    public long createFileToZip(String zipFilename,String sourceFileName) throws Exception {

            File  sourceFile = new File(sourceFileName);

            byte[] buf = new byte[1024];

            //压缩文件名
            File objFile = new File(zipFilename);

            ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(objFile));

            ZipEntry ze = null;
            //创建一个ZipEntry，并设置Name和其它的一些属性
            ze = new ZipEntry(sourceFile.getName());
            ze.setSize(sourceFile.length());
            ze.setTime(sourceFile.lastModified());

            //将ZipEntry加到zos中，再写入实际的文件内容
            zos.putNextEntry(ze);

            InputStream is = new BufferedInputStream(new FileInputStream(sourceFile));

            int readLen = -1;
            while ((readLen = is.read(buf, 0, 1024)) != -1) {
                    zos.write(buf, 0, readLen);
            }
            is.close();
            zos.close();


            return objFile.length();
    }
    /**
     * 测试解压缩功能. 将d:\\download\\test.zip连同子目录解压到d:\\temp\\zipout目录下.
     *
     * @throws Exception
     */
    public void releaseZipToFile(String sourceZip, String outFileName)
                    throws IOException{
                  ZipFile zfile=new ZipFile(sourceZip);
                  System.out.println(zfile.getName());
                  Enumeration zList=zfile.entries();
                  ZipEntry ze=null;
                  byte[] buf=new byte[1024];
                  while(zList.hasMoreElements()){
                  //从ZipFile中得到一个ZipEntry
                  ze=(ZipEntry)zList.nextElement();
                  if(ze.isDirectory()){
                  continue;
                  }
                  //以ZipEntry为参数得到一个InputStream，并写到OutputStream中
                  OutputStream os=new BufferedOutputStream(new FileOutputStream(getRealFileName(outFileName, ze.getName())));
                  InputStream is=new BufferedInputStream(zfile.getInputStream(ze));
                  int readLen=0;
                  while ((readLen=is.read(buf, 0, 1024))!=-1) {
                  os.write(buf, 0, readLen);
                  }
                  is.close();
                  os.close();
                  System.out.println("Extracted: "+ze.getName());
                  }
                  zfile.close();
    }
   
   

public static void main( String[] args) {
MyWar war = new MyWar();
String file = "D:/java/test/";
String result = "D:/java/test1/test.war";
try {
war.createZip(file, result);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}