Zip使用：压缩和解压缩“字符串”

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

public class ZipUtils {
   private static final String LOG_TAG = "ZipUtils";

   /*
    * 用标准的Zip包压缩数据
    */
   public static String compress(String str){
      try{
         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");
      } catch (Exception e) {
         Logger.i(LOG_TAG, "IOException,Failed to compress1 message."+ e.toString());
      }
      return null;
   }
   
   // 解压缩
   public static String uncompress(String str){
      try{
      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);
      }
      return out.toString();
      }
      catch(Exception e)
      {
         Logger.i(LOG_TAG, "IOException,Failed to uncompress1 message."+ e.toString());
      }
      return null;
   }
}

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