GZipStream的简单使用

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class MessageGZip {

public static void main(String[] args) {
//压缩测试
String str = "GZIP压缩解压类测试！GZIP压缩解压类测试！GZIP压缩解压类测试！GZIP压缩解压类测试！GZIP压缩解压类测试！GZIP压缩解压类测试！";
System.out.println("压缩前的字符串转换为字节数组的长度："+str.getBytes().length);
byte[] b = new byte[1024];
b = MessageGZip.compressToByte(str, "utf-8");
System.out.println("压缩后的字符串转换为字节数组的长度："+b.length);
//解压测试
String str2 = MessageGZip.uncompressToString(b, "utf-8");
//解压缩出的字符串
System.out.println(str2);

// 返回的测试结果
// 压缩前的字符串转换为字节数组的长度：120
// 压缩后的字符串转换为字节数组的长度：51
// GZIP压缩解压类测试！GZIP压缩解压类测试！GZIP压缩解压类测试！GZIP压缩解压类测试！GZIP压缩解压类测试！GZIP压缩解压类测试！
}

private static String encode = "utf-8";// "ISO-8859-1"

public String getEncode() {
return encode;
}

/*
* 设置 编码，默认编码：UTF-8
*/
public void setEncode(String encode) {
MessageGZip.encode = encode;
}

/*
* 字符串压缩为字节数组
*/
public static byte[] compressToByte(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) {
e.printStackTrace();
}
return out.toByteArray();
}

/*
* 字节数组解压缩后返回字符串
*/
public static String uncompressToString(byte[] b, String encoding) {
if (b == null || b.length == 0) {
return null;
}
ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayInputStream in = new ByteArrayInputStream(b);
try {
GZIPInputStream gunzip = new GZIPInputStream(in);
byte[] buffer = new byte[256];
int n;
while ((n = gunzip.read(buffer)) >= 0) {
out.write(buffer, 0, n);
}
return out.toString(encoding);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}