ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
    ObjectOutputStream out = null; 
    try { 
      out = new ObjectOutputStream(baos); 
      out.writeObject(java实例对象);    
    } catch (IOException e) { 
      logger.error("msg2Bytes error!", e); 
    }finally{ 
      try { 
        out.close(); 
      } catch (IOException e) { 
        logger.error("msg2Bytes error!", e); 
      } 
    } 
     
    return baos.toByteArray(); 

ByteArrayInputStream bais; 
    ObjectInputStream in = null; 
    try{ 
      bais = new ByteArrayInputStream(bytes); 
      in = new ObjectInputStream(bais); 
 
      return (java类)in.readObject(); 
    }finally{ 
      if(in != null){ 
        try { 
          in.close(); 
        } catch (IOException e) { 
          logger.error("bytes2Msg error!", e); 
        } 
      } 
    }