springmvc全局异常处理ControllerAdvice区分返回响应类型是页面还是JSON

客官°小女子只卖身不卖艺 2023-08-17 15:36 110阅读 0赞

**思路：**

加一个拦截器，在preHandler中取得HandlerMethod，判断其方法的返回类型，以及方法的注解和类的注解。

如果返回是json，收到异常则返回默认的异常包装类型。

如果返回是页面，收到异常则返回默认的异常页面。

**拦截器代码如下:**

package com.xxx.config;

import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.method.HandlerMethod;
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    import java.lang.reflect.Method;
    
    @Component
    public class BaseInterceptor implements HandlerInterceptor {
    
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            if (!(handler instanceof HandlerMethod)) {
                return true;
            }
    
            HandlerMethod hm = (HandlerMethod) handler;
            Method method = hm.getMethod();
    
            boolean isPage = method.getReturnType().equals(String.class);
            boolean isJosn = !method.isAnnotationPresent(ResponseBody.class);
            boolean isController = (!hm.getBeanType().isAnnotationPresent(RestController.class) || !hm.getBeanType().isAnnotationPresent(Controller.class));
            
            //controller_response_is_view 这个表示controller的返回响应类型是页面
            request.setAttribute("method_return_is_view", isPage && isJosn && isController);
    
            return true;
        }
    
    }

**全局异常处理ControllerAdvice代码如下：**

package com.xxx.config;
    
    import org.springframework.web.bind.annotation.ControllerAdvice;
    import org.springframework.web.bind.annotation.ExceptionHandler;
    
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.web.servlet.ModelAndView;
    import org.springframework.web.servlet.view.json.MappingJackson2JsonView;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    @ControllerAdvice
    @Slf4j
    public class CommonExceptionHandler {
    
        @ExceptionHandler
        public ModelAndView handleException(Exception exception, HttpServletRequest request, HttpServletResponse response) throws Exception{
            log.error(exception.getMessage(), exception);
    
            Object o = request.getAttribute("controller_response_is_view");
            if( o == null) {
                throw exception;
            }
    
            boolean isView = (Boolean)o;
            if(isView){  //返回页面
                //获取http状态码statusCode:401,404.jsp,500
                Integer statusCode = (Integer) request.getAttribute("javax.servlet.error.status_code");
                if(statusCode == 401){
                    return new ModelAndView("error/401");
                }else if(statusCode == 403){
                    return new ModelAndView("error/403");
                }else if(statusCode == 404){
                    return new ModelAndView("error/404");
                }else{
                    return new ModelAndView("error/500");
                }
            }
    
            //返回json
            ModelAndView mv = new ModelAndView(new MappingJackson2JsonView());
            mv.addObject("code","500");
            mv.addObject("message",exception.getMessage());
            return mv;
        }
    
    }

转载于:https://www.cnblogs.com/zsg88/p/11543654.html