新建一个类 在类上加一个注解即可 @ControllerAdvice 

/**

 * 全局错误处理

 * @author sys

 *

 */

@ControllerAdvice

@ResponseBody

public class GlobalExceptionHandler {

  private final Logger log = Logger.getLogger(this.getClass());

  @ExceptionHandler(value=Exception.class)  //拦截异常的种类

  public Object MethodArgumentNotValidHandler(HttpServletRequest request,

          Exception ex) throws Exception

  {  

          StringWriter sw = new StringWriter();

        PrintWriter pw = new PrintWriter(sw);

        ex.printStackTrace(pw);

        log.error(sw.toString());

        ResData res = new ResData(,"请求错误");

      return JSON.toJSONString(res);

  }

}