JAVA字串的GZIP壓縮解壓縮方法
package com.gzip;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
// 將一個字串按照zip方式壓縮和解壓縮
public class ZipUtil2 {
// 壓縮
public static String compress(String str) throws IOException {
if (str == null || str.length() == 0) {
return str;
}
ByteArrayOutputStream out = new ByteArrayOutputStream();
GZIPOutputStream gzip = new GZIPOutputStream(out);
gzip.write(str.getBytes());
gzip.close();
return out.toString("ISO-8859-1");
}
// 解壓縮
public static String uncompress(String str) throws IOException {
if (str == null || str.length() == 0) {
return str;
}
ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayInputStream in = new ByteArrayInputStream(str
.getBytes("ISO-8859-1"));
GZIPInputStream gunzip = new GZIPInputStream(in);
byte[] buffer = new byte[256];
int n;
while ((n = gunzip.read(buffer))>= 0) {
out.write(buffer, 0, n);
}
// toString()使用平臺預設編碼,也可以顯式的指定如toString("GBK")
return out.toString();
}
// 測試方法
public static void main(String[] args) throws IOException {
//測試字串
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:"+ZipUtil2.compress(str).length());
System.out.println("解壓縮:"+ZipUtil2.uncompress(ZipUtil2.compress(str)));
}
}