使用注解处理异常

• 异常处理类

package com.uc.advice;import com.uc.enums.Code;import org.apache.log4j.Logger;import org.springframework.web.bind.MissingServletRequestParameterException;import org.springframework.web.bind.annotation.ControllerAdvice;import org.springframework.web.bind.annotation.ExceptionHandler;import org.springframework.web.bind.annotation.ResponseBody;import java.util.HashMap;import java.util.Map;/** * 全局异常处理 * Created by yanhao on 2017/6/5. */@ControllerAdvicepublic class GlobalExceptionHandler {    private final Logger logger = Logger.getLogger(GlobalExceptionHandler.class);    // Exception处理    @ExceptionHandler(Exception.class)    @ResponseBody    public Object handle(Exception e) {        logger.warn("Exception: " + e.getMessage());        // 返回内容        Map
    
      result = new HashMap
     
      ();        result.put("message", e.getMessage());        // 请求参数为空的异常        if(e instanceof MissingServletRequestParameterException) {            result.put("code", Code.PARAM_MISSING.getCode());        }        // 业务失败返回        return result;    }}
     
    

• 产生MissingServletRequestParameterException的地方

// required 是true情况下，为传值@RequestParam(value = "mode", required = true)String mode