项目中需要：写了个ZIP的解压缩代码

/**
 * 
 */
package net.easipay.pepp.cbt.merchant.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

/**
 * @author Administrator
 * Zip的解压缩文件,最好填写Parameter DirPath
 */
public class ZipUtil {
	
	/**
	 *  默认的目录路径
	 */
	public static final String DEFAULT_DIR_PATH = "/";
	
	public static final String DEFAULT_FILE_NAME = "/default.zip";
	
	/**
	 * 解压zip文件
	 * @param is 输入流
	 * @param os 输出流
	 * @throws IOException 
	 * @throws FileNotFoundException 
	 */
	public static void unZip(InputStream is, String dirPath) throws FileNotFoundException, IOException{
		if(null != is){
			ZipInputStream zis = new ZipInputStream(is);
			ZipEntry ze = null;
			while((ze = zis.getNextEntry()) != null){
				byte[] b = new byte[1024];
				int j = 0;
				String zipFileName = new String(ze.getName().getBytes(),Charset.forName("GBK"));
				OutputStream os = new FileOutputStream(dirPath + zipFileName);
				while((j = zis.read(b)) > 0){
					os.write(b, 0, j);
				}
                os.close();
			}
		}
	}
	
	/**
	 * 压缩文件
	 * @param fs 多个文件
	 * @param zos 压缩文件流
	 * @return 压缩文件流
	 */
	public static ZipOutputStream zip(File f, ZipOutputStream zos,String parent){
		try {
			zos = null == zos ? new ZipOutputStream(new FileOutputStream(DEFAULT_FILE_NAME))
			                    : zos;
			parent = parent.length() == 0 ? "" : parent + "/";
			if(f.isDirectory()){
				File[] fs = f.listFiles();
				for(File df : fs){
					String fileName = new String(f.getName().getBytes(Charset.forName("GBK")));
					zip(df,zos,parent + fileName);
				}
			} else {
				String fileName = new String(f.getName().getBytes(Charset.forName("GBK")));
				ZipEntry ze = new ZipEntry(parent + fileName);
				zos.putNextEntry(ze);
				InputStream is = new FileInputStream(f);
				byte[] temp = new byte[1024];
				int len = 0;
				while((len = is.read(temp)) > 0){
					zos.write(temp, 0, len);
				}
			}
		} catch (FileNotFoundException e1) {
			e1.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return zos;
	}
	
	public static void main(String[] args) {
		File dirFile = new File("D:/ccc");
		ZipOutputStream zos = null;
		try {
			zos = new ZipOutputStream(new FileOutputStream("D:/ccc.zip"));
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		zos = ZipUtil.zip(dirFile, zos, "");
		try {
			zos.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

另外我一直在寻求java解压缩rar的方法，但是查了资料说，rar是收费的所以java就没有支持他，不知道同仁们还有没有好的方式解决这样的需求，理论上是可以解决的。