java GZIP 压缩数据

 

package com.cjonline.foundation.cpe.action;



import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.zip.GZIPInputStream;

import java.util.zip.GZIPOutputStream;



public abstract class GZipUtils {  

  

    public static final int BUFFER = 1024;  

    public static final String EXT = ".gz";  

  

    /** 

     * 数据压缩 

     *  

     * @param data 

     * @return 

     * @throws Exception 

     */  

    public static byte[] compress(byte[] data) throws Exception {  

        ByteArrayInputStream bais = new ByteArrayInputStream(data);  

        ByteArrayOutputStream baos = new ByteArrayOutputStream();  

  

        // 压缩  

        compress(bais, baos);  

  

        byte[] output = baos.toByteArray();  

  

        baos.flush();  

        baos.close();  

  

        bais.close();  

  

        return output;  

    }  

  

    /** 

     * 文件压缩 

     *  

     * @param file 

     * @throws Exception 

     */  

    public static void compress(File file) throws Exception {  

        compress(file, true);  

    }  

  

    /** 

     * 文件压缩 

     *  

     * @param file 

     * @param delete 

     *            是否删除原始文件 

     * @throws Exception 

     */  

    public static void compress(File file, boolean delete) throws Exception {  

        FileInputStream fis = new FileInputStream(file);  

        FileOutputStream fos = new FileOutputStream(file.getPath() + EXT);  

  

        compress(fis, fos);  

  

        fis.close();  

        fos.flush();  

        fos.close();  

  

        if (delete) {  

            file.delete();  

        }  

    }  

  

    /** 

     * 数据压缩 

     *  

     * @param is 

     * @param os 

     * @throws Exception 

     */  

    public static void compress(InputStream is, OutputStream os)  

            throws Exception {  

  

        GZIPOutputStream gos = new GZIPOutputStream(os);  

  

        int count;  

        byte data[] = new byte[BUFFER];  

        while ((count = is.read(data, 0, BUFFER)) != -1) {  

            gos.write(data, 0, count);  

        }  

  

        gos.finish();  

  

        gos.flush();  

        gos.close();  

    }  

  

    /** 

     * 文件压缩 

     *  

     * @param path 

     * @throws Exception 

     */  

    public static void compress(String path) throws Exception {  

        compress(path, true);  

    }  

  

    /** 

     * 文件压缩 

     *  

     * @param path 

     * @param delete 

     *            是否删除原始文件 

     * @throws Exception 

     */  

    public static void compress(String path, boolean delete) throws Exception {  

        File file = new File(path);  

        compress(file, delete);  

    }  

  

    /** 

     * 数据解压缩 

     *  

     * @param data 

     * @return 

     * @throws Exception 

     */  

    public static byte[] decompress(byte[] data) throws Exception {  

        ByteArrayInputStream bais = new ByteArrayInputStream(data);  

        ByteArrayOutputStream baos = new ByteArrayOutputStream();  

  

        // 解压缩  

  

        decompress(bais, baos);  

  

        data = baos.toByteArray();  

  

        baos.flush();  

        baos.close();  

  

        bais.close();  

  

        return data;  

    }  

  

    /** 

     * 文件解压缩 

     *  

     * @param file 

     * @throws Exception 

     */  

    public static void decompress(File file) throws Exception {  

        decompress(file, true);  

    }  

  

    /** 

     * 文件解压缩 

     *  

     * @param file 

     * @param delete 

     *            是否删除原始文件 

     * @throws Exception 

     */  

    public static void decompress(File file, boolean delete) throws Exception {  

        FileInputStream fis = new FileInputStream(file);  

        FileOutputStream fos = new FileOutputStream(file.getPath().replace(EXT,  

                ""));  

        decompress(fis, fos);  

        fis.close();  

        fos.flush();  

        fos.close();  

  

        if (delete) {  

            file.delete();  

        }  

    }  

  

    /** 

     * 数据解压缩 

     *  

     * @param is 

     * @param os 

     * @throws Exception 

     */  

    public static void decompress(InputStream is, OutputStream os)  

            throws Exception {  

  

        GZIPInputStream gis = new GZIPInputStream(is);  

  

        int count;  

        byte data[] = new byte[BUFFER];  

        while ((count = gis.read(data, 0, BUFFER)) != -1) {  

            os.write(data, 0, count);  

        }  

  

        gis.close();  

    }  

  

    /** 

     * 文件解压缩 

     *  

     * @param path 

     * @throws Exception 

     */  

    public static void decompress(String path) throws Exception {  

        decompress(path, true);  

    }  

  

    /** 

     * 文件解压缩 

     *  

     * @param path 

     * @param delete 

     *            是否删除原始文件 

     * @throws Exception 

     */  

    public static void decompress(String path, boolean delete) throws Exception {  

        File file = new File(path);  

        decompress(file, delete);  

    }  

  

}