java中GZIP压缩解压类使用实例

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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原文链接：http://blog.csdn.net/itachi85/article/details/6597965