code: public String getArguments(MethodInvocation invocation) {
  
  		try {
  			Object[] args = invocation.getArguments();
  			if (args == null)
  				return null;
  			if (args.length != 1)
  				return null;// 参数是一个主键
  
  			if (args[0] == null)
  				return null;
  			return args[0].toString();
  		} catch (Exception ex) {
  			Debug.logError("[JdonFramework] method:"
  					+ invocation.getMethod().getName() + "  " + ex, module);
  			return null;
  		}
  
  	}
docs: 组合参数数值为一个字符串 这些参数必须实现toString();
  
  @param invocation
  MethodInvocation
  @return String