Java使用GZIP进行压缩和解压缩（GZIPOutputStream，GZIPInputStream）

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最新推荐文章于 2025-03-07 17:40:43 发布

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分类专栏： java基础文章标签： GZIP 压缩解压缩 Java 字节数组

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本文展示了如何使用Java实现GZIP压缩和解压缩。`GZIPUtils`类包含两个静态方法：`compress`用于将字符串压缩为GZIP字节数组，`uncompress`用于对GZIP字节数组进行解压缩。示例代码中提供了详细的使用方法，包括异常处理和日志记录。

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使用GZIPOutputStream进行GZIP压缩：

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进行GZIP解压缩：

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();
}

完整代码：

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";
/**
* 字符串压缩为GZIP字节数组
*
* @param str
* @return
*/
public static byte[] compress(String str) {
return compress(str, GZIP_ENCODE_UTF_8);
}
/**
* 字符串压缩为GZIP字节数组
*
* @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解压缩
*
* @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("原长度：" + str.length());
System.out.println("压缩后字符串：" + GZIPUtils.compress(str).toString().length());
System.out.println("解压缩后字符串：" + StringUtils.newStringUtf8(GZIPUtils.uncompress(GZIPUtils.compress(str))));
System.out.println("解压缩后字符串：" + GZIPUtils.uncompressToString(GZIPUtils.compress(str)));
}
}