Java使用GZIP進行壓縮和解壓縮（GZIPOutputStream，GZIPInputStream）__Java

使用GZIPOutputStream進行GZIP壓縮：

public static byte[] compress(String str, String encoding) {        if (str == null || str.length() == 0) {            return null;        }        ByteArrayOutputStream out = new ByteArrayOutputStream();        GZIPOutputStream gzip;        try {            gzip = new GZIPOutputStream(out);            gzip.write(str.getBytes(encoding));            gzip.close();        } catch (IOException e) {            ApiLogger.error("gzip compress error.", e);        }        return out.toByteArray();    }

使用GZIPInputStream進行GZIP解壓縮：

public static byte[] uncompress(byte[] bytes) {        if (bytes == null || bytes.length == 0) {            return null;        }        ByteArrayOutputStream out = new ByteArrayOutputStream();        ByteArrayInputStream in = new ByteArrayInputStream(bytes);        try {            GZIPInputStream ungzip = new GZIPInputStream(in);            byte[] buffer = new byte[256];            int n;            while ((n = ungzip.read(buffer)) >= 0) {                out.write(buffer, 0, n);            }        } catch (IOException e) {            ApiLogger.error("gzip uncompress error.", e);        }        return out.toByteArray();    }

完整代碼：

package com.weibo.api.proxy.server.util;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.util.zip.GZIPInputStream;import java.util.zip.GZIPOutputStream;import org.apache.commons.codec.binary.StringUtils;import cn.sina.api.commons.util.ApiLogger;/** *  * @author wenqi5 *  */public class GZIPUtils {    public static final String GZIP_ENCODE_UTF_8 = "UTF-8";    public static final String GZIP_ENCODE_ISO_8859_1 = "ISO-8859-1";    /**     * 字串壓縮為GZIP位元組數組     *      * @param str     * @return     */    public static byte[] compress(String str) {        return compress(str, GZIP_ENCODE_UTF_8);    }    /**     * 字串壓縮為GZIP位元組數組     *      * @param str     * @param encoding     * @return     */    public static byte[] compress(String str, String encoding) {        if (str == null || str.length() == 0) {            return null;        }        ByteArrayOutputStream out = new ByteArrayOutputStream();        GZIPOutputStream gzip;        try {            gzip = new GZIPOutputStream(out);            gzip.write(str.getBytes(encoding));            gzip.close();        } catch (IOException e) {            ApiLogger.error("gzip compress error.", e);        }        return out.toByteArray();    }    /**     * GZIP解壓縮     *      * @param bytes     * @return     */    public static byte[] uncompress(byte[] bytes) {        if (bytes == null || bytes.length == 0) {            return null;        }        ByteArrayOutputStream out = new ByteArrayOutputStream();        ByteArrayInputStream in = new ByteArrayInputStream(bytes);        try {            GZIPInputStream ungzip = new GZIPInputStream(in);            byte[] buffer = new byte[256];            int n;            while ((n = ungzip.read(buffer)) >= 0) {                out.write(buffer, 0, n);            }        } catch (IOException e) {            ApiLogger.error("gzip uncompress error.", e);        }        return out.toByteArray();    }    /**     *      * @param bytes     * @return     */    public static String uncompressToString(byte[] bytes) {        return uncompressToString(bytes, GZIP_ENCODE_UTF_8);    }    /**     *      * @param bytes     * @param encoding     * @return     */    public static String uncompressToString(byte[] bytes, String encoding) {        if (bytes == null || bytes.length == 0) {            return null;        }        ByteArrayOutputStream out = new ByteArrayOutputStream();        ByteArrayInputStream in = new ByteArrayInputStream(bytes);        try {            GZIPInputStream ungzip = new GZIPInputStream(in);            byte[] buffer = new byte[256];            int n;            while ((n = ungzip.read(buffer)) >= 0) {                out.write(buffer, 0, n);            }            return out.toString(encoding);        } catch (IOException e) {            ApiLogger.error("gzip uncompress to string error.", e);        }        return null;    }    public static void main(String[] args) {        String str =                        "%5B%7B%22lastUpdateTime%22%3A%222011-10-28+9%3A39%3A41%22%2C%22smsList%22%3A%5B%7B%22liveState%22%3A%221";        System.out.println("原長度：" + str.length());        System.out.println("壓縮後字串：" + GZIPUtils.compress(str).toString().length());        System.out.println("解壓縮後字串：" + StringUtils.newStringUtf8(GZIPUtils.uncompress(GZIPUtils.compress(str))));        System.out.println("解壓縮後字串：" + GZIPUtils.uncompressToString(GZIPUtils.compress(str)));    }}