GZIP壓縮解壓Java類代碼

  當我們客戶端與服務端進行數據傳輸時需要走流量，為了節省流量我們常常需要寫一個壓縮類對數據進行壓縮。

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

/**

GZIP壓縮解壓類
*/
public class MessageGZIP {
private static String encode = "utf-8";//"ISO-8859-1"
public String getEncode() {

 return encode;

}
/*

設置 編碼，默認編碼：UTF-8
*/
public void setEncode(String encode) {
 MessageGZIP.encode = encode;
}
/*

字符串壓縮為字節數組
*/
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();
}
/*

字符串壓縮為字節數組
*/
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();
}
/*

字節數組解壓縮后返回字符串
*/
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();
}
/*

字節數組解壓縮后返回字符串
*/
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;
}
}</pre>