JAVA字符串的GZIP压缩解压缩

// JAVA CODE

package A;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
// 将一个字符串按照zip方式压缩和解压缩
public class ZipUtil2 {
// 压缩
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”);
}
// 解压缩
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()使用平台默认编码,也可以显式的指定如toString("GBK")
return out.toString();
}
// 测试方法
public static void main(String[] args) throws IOException {
// 测试字符串
String str = "aa”;
System.out.println("原长度:” + str.length());
System.out.println("压缩后:” + ZipUtil2.compress(str).length());
System.out.println("?~?P(K'c粚J摊C?” + ZipUtil2.compress(str));
System.out.println("解压缩:” + ZipUtil2.uncompress(ZipUtil2.compress(str)));
}
}

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