ziputil.java

zip压缩与解压

/**
 * by jansonhorn 2007.12.28
 */

import java.util.zip.*;
import java.io.*;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class ZipUtil{

	public static void zip(String zipFileName,String inputFile)throws Exception{
		zip(zipFileName,new File(inputFile));
	}

	public static void zip(String zipFileName,File inputFile)throws Exception{
		ZipOutputStream out=new ZipOutputStream(new FileOutputStream(zipFileName));
		zip(out,inputFile,"");
		out.close();
	}

	public static void unzip(String zipFileName,String outputDirectory)throws Exception{
		ZipInputStream in=new ZipInputStream(new FileInputStream(zipFileName));
		File d = new File(outputDirectory);
		if(!d.exists())d.mkdir();
		ZipEntry z;
		while ((z=in.getNextEntry() )!= null){
			System.out.println("unziping "+z.getName());
			if (z.isDirectory()){
				String name=z.getName();
				name=name.substring(0,name.length()-1);
				File f=new File(outputDirectory+File.separator+name);
				f.mkdir();
			}else{
				File f=new File(outputDirectory+File.separator+z.getName());
				//System.out.println("create new file: " + outputDirectory+File.separator+z.getName());
				f.createNewFile();
				FileOutputStream out=new FileOutputStream(f);
				int b;
				while ((b=in.read()) != -1)
					out.write(b);
				out.close();
			}
		}
		in.close();
	}

	public static void zip(ZipOutputStream out,File f,String base)throws Exception{
		if (f.isDirectory()){
			File[] fl=f.listFiles();
			out.putNextEntry(new ZipEntry(base+"/"));
			base=base.length()==0?"":base+"/";
			for (int i=0;i<fl.length ;i++ ){
				zip(out,fl[i],base+fl[i].getName());
			}
		}else{
			out.putNextEntry(new ZipEntry(base));
			FileInputStream in=new FileInputStream(f);
			int b;
			while ((b=in.read()) != -1)
				out.write(b);
			in.close();
		}
	}

    private static byte[] _unzip(byte[] zipbytes)  throws IOException {  
    	ByteArrayInputStream bais = new ByteArrayInputStream(zipbytes);  
    	//   string entryname = new string("servletservice");  
    	ZipInputStream zis = new ZipInputStream(bais);  
		zis.getNextEntry();  
		ByteArrayOutputStream baos = new ByteArrayOutputStream();  
		final int bufsiz = 4096;  
		byte inbuf[] = new byte[bufsiz];  
		int n;  
		while ( (n = zis.read(inbuf, 0, bufsiz)) != -1) {  
		  baos.write(inbuf, 0, n);  
		}  
		byte[] data = baos.toByteArray();
		zis.close();  
		return data;  
	}
  
    private static byte[] _zip(byte[] data)  throws IOException {  
    	ByteArrayOutputStream baos = new ByteArrayOutputStream();  
    	ZipEntry ze = new ZipEntry("xiaoshuoss");  
		ZipOutputStream zos = new ZipOutputStream(baos);  
		zos.putNextEntry(ze);  
		zos.write(data, 0, data.length);  
		zos.close();  
		byte[] zipbytes = baos.toByteArray();  
		return zipbytes;  
	} 
  
    public static String zip(String s) throws IOException{
    	byte[] bt = s.getBytes();
		byte[] bt1 = _zip(bt);
		String b = new BASE64Encoder().encode(bt1);
		return b;
    }
    
    public static String unzip(String s) throws IOException{
		byte[] bt = new BASE64Decoder().decodeBuffer(s);
		byte[] bt1 = _unzip(bt);
		String c = new String(bt1);
		return c;
    }
    
	public static void main(String[] args) throws IOException{
		try{
			unzip("c:\\temp.zip","c:\\temp");
		}
		catch(Exception e){e.printStackTrace(System.out);}
		
		String s = "just a test, 这是一个测试，ｔｈｉｓ　ｉｓ　ａ　ｔｅｓｔ．" +
				"just a test, 这是一个测试，ｔｈｉｓ　ｉｓ　ａ　ｔｅｓｔ．" +
				"just a test, 这是一个测试，ｔｈｉｓ　ｉｓ　ａ　ｔｅｓｔ．" +
				"just a test, 这是一个测试，ｔｈｉｓ　ｉｓ　ａ　ｔｅｓｔ．" +
				"just a test, 这是一个测试，ｔｈｉｓ　ｉｓ　ａ　ｔｅｓｔ．" +
				"just a test, 这是一个测试，ｔｈｉｓ　ｉｓ　ａ　ｔｅｓｔ．" +
				"just a test, 这是一个测试，ｔｈｉｓ　ｉｓ　ａ　ｔｅｓｔ．" +
				"just a test, 这是一个测试，ｔｈｉｓ　ｉｓ　ａ　ｔｅｓｔ．" +
				"just a test, 这是一个测试，ｔｈｉｓ　ｉｓ　ａ　ｔｅｓｔ．" +
				"just a test, 这是一个测试，ｔｈｉｓ　ｉｓ　ａ　ｔｅｓｔ．" +
				"just a test, 这是一个测试，ｔｈｉｓ　ｉｓ　ａ　ｔｅｓｔ．";
		String b = zip(s);
		System.out.println(b);
		String c = unzip(b);
		System.out.println(c);
	}

}