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java使用gzip實(shí)現(xiàn)文件解壓縮示例

更新時間：2014年03月03日 16:54:59 作者：

這篇文章主要介紹了java使用gzip實(shí)現(xiàn)文件解壓縮示例,需要的朋友可以參考下

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";

    /**
     * 數(shù)據(jù)壓縮
     *
     * @param data
     * @return
     * @throws Exception
     */
    public static byte[] compress(byte[] data) throws Exception {
        ByteArrayInputStream bais = new ByteArrayInputStream(data);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        // 壓縮
        compress(bais, baos);

        byte[] output = baos.toByteArray();

        baos.flush();
        baos.close();

        bais.close();

        return output;
    }

    /**
     * 文件壓縮
     *
     * @param file
     * @throws Exception
     */
    public static void compress(File file) throws Exception {
        compress(file, true);
    }

    /**
     * 文件壓縮
     *
     * @param file
     * @param delete
     *            是否刪除原始文件
     * @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();
        }
    }

    /**
     * 數(shù)據(jù)壓縮
     *
     * @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();
    }

    /**
     * 文件壓縮
     *
     * @param path
     * @throws Exception
     */
    public static void compress(String path) throws Exception {
        compress(path, true);
    }

    /**
     * 文件壓縮
     *
     * @param path
     * @param delete
     *            是否刪除原始文件
     * @throws Exception
     */
    public static void compress(String path, boolean delete) throws Exception {
        File file = new File(path);
        compress(file, delete);
    }

    /**
     * 數(shù)據(jù)解壓縮
     *
     * @param data
     * @return
     * @throws Exception
     */
    public static byte[] decompress(byte[] data) throws Exception {
        ByteArrayInputStream bais = new ByteArrayInputStream(data);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        // 解壓縮

        decompress(bais, baos);

        data = baos.toByteArray();

        baos.flush();
        baos.close();

        bais.close();

        return data;
    }

    /**
     * 文件解壓縮
     *
     * @param file
     * @throws Exception
     */
    public static void decompress(File file) throws Exception {
        decompress(file, true);
    }

    /**
     * 文件解壓縮
     *
     * @param file
     * @param delete
     *            是否刪除原始文件
     * @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();
        }
    }

    /**
     * 數(shù)據(jù)解壓縮
     *
     * @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();
    }

    /**
     * 文件解壓縮
     *
     * @param path
     * @throws Exception
     */
    public static void decompress(String path) throws Exception {
        decompress(path, true);
    }

    /**
     * 文件解壓縮
     *
     * @param path
     * @param delete
     *            是否刪除原始文件
     * @throws Exception
     */
    public static void decompress(String path, boolean delete) throws Exception {
        File file = new File(path);
        decompress(file, delete);
    }
}