java压缩 GZIP进行简单压缩，ZIP进行多文件保存

java压缩  GZIP进行简单压缩，ZIP进行多文件保存

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package org.rui.io.compress;

import java.io.BufferedOutputStream;

import java.io.BufferedReader;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.InputStreamReader;

import java.util.zip.GZIPInputStream;

import java.util.zip.GZIPOutputStream;

/**

 * 用GZIP进行简单压缩

 * @author lenovo

 *

 */

public class GZIPcompress {

	static String path="D:\\Users\\liangrui\\workspace\\thinking\\src\\org\\rui\\io\\compress\\";

	static String [] arg=new String[]{path+"GZIPcompress.java"};

	public static void main(String[] args) throws Exception {

		//in

		BufferedReader in=new BufferedReader(new FileReader(arg[0]));

		//out

		BufferedOutputStream out=new BufferedOutputStream(new GZIPOutputStream(

				new FileOutputStream("test.gz")

				));

		System.out.println("writing file");

		int c;

		while((c=in.read())!=-1)

		{

			out.write(c);

		}

		//close

		in.close();

		out.close();

		System.out.println("reading file================");

		BufferedReader br=new BufferedReader(

				new InputStreamReader(

						new GZIPInputStream(

								new FileInputStream("test.gz")

								)

						)

				);

		String s;

		while((s=br.readLine())!=null)

			System.out.println(s);

	}

}

package org.rui.io.compress;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.util.Enumeration;

import java.util.zip.Adler32;

import java.util.zip.CheckedInputStream;

import java.util.zip.CheckedOutputStream;

import java.util.zip.ZipEntry;

import java.util.zip.ZipFile;

import java.util.zip.ZipInputStream;

import java.util.zip.ZipOutputStream;

/**

 * 用Zip进行多文件保存

 * @author lenovo

 *

 */

public class ZipCompress {

	//static String path="D:\\Users\\liangrui\\workspace\\thinking\\src\\org\\rui\\io\\compress\\";

	static String path=new File("").getAbsolutePath()+"\\src\\org\\rui\\io\\compress\\";

	static String [] arg=new String[]{path+"GZIPcompress.java",path+"ZipCompress.java"};

	public static void main(String[] args) throws Exception {

		//out

		FileOutputStream f=new FileOutputStream("test.zip");

		CheckedOutputStream cos=new CheckedOutputStream(f,new Adler32());

		ZipOutputStream zos=new ZipOutputStream(cos);

		//out

		BufferedOutputStream out=new BufferedOutputStream(zos);

		zos.setComment("A test of java zipping");

		for(String s:arg)

		{

			System.out.println("writing file "+s);

			BufferedReader in =new BufferedReader(new FileReader(s));

			//

			zos.putNextEntry(new ZipEntry(s));

			int c;

			while((c=in.read())!=-1){

				out.write(c);

			}

			in.close();

			out.flush();

		}

		out.close();

		//checksum valid only after the file has been closed!

		System.out.println("reading file================");

		FileInputStream fi=new FileInputStream("test.zip");

		CheckedInputStream csumi=new CheckedInputStream(fi,new Adler32());

		ZipInputStream zis=new ZipInputStream(csumi);

		BufferedInputStream bis=new BufferedInputStream(zis);

		ZipEntry ze;

		while((ze=zis.getNextEntry())!=null)

		{

			System.out.println("Reading file "+ze);

			int x;

			while((x=bis.read())!=-1)

			{

				//System.out.print((char)x);

				System.out.write(x);

			}

		}

		//

		if(arg.length==1)

			System.out.println("checksum:"+csumi.getChecksum().getValue());

		bis.close();

		//alternative way to open and read zip files

		ZipFile zf=new ZipFile("test.zip");

		Enumeration e=zf.entries();

		while(e.hasMoreElements())

		{

			ZipEntry ze2=(ZipEntry) e.nextElement();

			System.out.println("file:"+ze2);

			//...and extract the data as before

		}

		/*if(arg.length==1)*/

	}

}