[转]GZIP压缩解压类
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。
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; }}