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java中GZIP压缩解压类使用实例
当我们客户端与服务端进行数据传输时需要走流量，为了节省流量我们常常需要写一个压缩类对数据进行压缩。
实例代码：
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
/**
* GZIP压缩解压类
*/
public class MessageGZIP {
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){
if (str == null || str.length() == 0) {
return null;
}
ByteArrayOutputStream out = new ByteArrayOutputStream();
GZIPOutputStream gzip;
try {
gzip = new GZIPOutputStream(out);
gzip.write(str.getBytes(encode));
gzip.close();
} catch (IOException e) {
e.printStackTrace();
}
return out.toByteArray();
}
/*
* 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) {
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);
}
} catch (IOException e) {
e.printStackTrace();
}
return out.toString();
}
/*
* 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;
}
}
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