java解压缩zip

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.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

public class ZipGenerate {

	/**
	 * 压缩成zip包
	 * 
	 * @param souceFileName
	 * @param destFileName
	 */
	private void zip(String souceFileName, String destFileName){
		try {
			File file = new File(souceFileName);
			if(file.exists()){
				FileOutputStream fileOut = new FileOutputStream(destFileName);
				ZipOutputStream out = new ZipOutputStream(fileOut);
				String base="";
				traverseFile(file, out,base);
				out.close();
				fileOut.close();
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	/**
	 * 循环遍历文件夹的所有文件
	 * @param file
	 * @param out
	 * @param base
	 * @throws IOException
	 */
	private void traverseFile(File file, ZipOutputStream out,String base)
			throws IOException {
		if (file.isDirectory()) {
			File[] files = file.listFiles();
			base=base+file.getName()+"/";
			out.putNextEntry(new ZipEntry(base));
//			System.out.println(base);
			for (File f : files) {
				traverseFile(f, out,base);
			}
		} else {
			base=base+file.getName();
//			System.out.println(base);
			out.putNextEntry(new ZipEntry(base));
			FileInputStream in = new FileInputStream(file);

			int b;
			byte[] by = new byte[1024];
			while ((b = in.read(by)) != -1) {
				out.write(by, 0, b);
			}
			in.close();
		}
	}
	/**
	 * 解压缩文件
	 * @param zipname
	 */
	private void unzip(String zipname){
		try {
			File zipFile = new File(zipname);
			String dictory_name=zipFile.getParent();
			File top_dictory=new File(dictory_name);
			if(!top_dictory.exists()){
				top_dictory.mkdirs();
			}
			ZipFile zip = new ZipFile(zipFile);
			for (Enumeration entries=zip.entries(); entries.hasMoreElements();) {
				ZipEntry entry = (ZipEntry)entries.nextElement();
				if(entry.isDirectory()){
					File dictory=new File(dictory_name+File.separator+entry.getName());
					if(!dictory.exists()){
						dictory.mkdirs();
					}
				}else{
					InputStream in = zip.getInputStream(entry);
					String path=dictory_name+File.separator+entry.getName();
					File file=new File(path);
					OutputStream out = new FileOutputStream(file);
					int b;
					byte[] by = new byte[1024];
					while ((b = in.read(by)) != -1) {
						out.write(by, 0, b);
					}
					out.close();
					in.close();
				}
			}
			
		} catch (ZipException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} 
	}
	public static void main(String[] args) {
//		File f=new File("E:\\temp\\hello.zip");
//		f.delete();
		ZipGenerate z = new ZipGenerate();
		//压缩
//		z.zip("E:\\temp\\hello", "E:\\temp\\hello.zip");
		//解压
		z.unzip("E:\\temp\\hello.zip");
		
	}
}