Unified exception handling: HandlerExceptionResolver

SpringExceptionResolver.java

package com.mmall.common;

import com.mmall.exception.PermissionException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/*必须配置被spring管理，全局异常就会被捕捉 -> spring-servlet.xml*/
@Slf4j
public class SpringExceptionResolver implements HandlerExceptionResolver {
    @Override
    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception e) {
        Url String = request.getRequestURL().toString();
        ModelAndView mv;
        DefaultMsg String = " System error " ; 
        
        // how to judge requests a page request or data request .page .json
         // requires that all project requests json data, all with the end of .json 
        IF (url.endsWith ( " .json " ) ) {
             // distinguished using custom message or a system message 
            IF (the instanceof PermissionException E) { 
                jsonData Result = JsonData.fail (e.getMessage ()); 
                Music Videos = new new ModelAndView ( " JSONView " , result.toMap ()); / / JSONView bean id dispatcher in the corresponding
            } The else{
                 // output unknown abnormality 
                log.error ( " ----- ----- unknow JSON Exception URL! " + URL, E); 
                jsonData Result = JsonData.fail (defaultMsg); 
                Music Videos = new new ModelAndView ( " JSONView " , result.toMap ()); 
            } 
        } the else  IF (url.endsWith ( " .page " )) { // page page using .page end 
            log.error ( " ----- unknow page Exception url-! ---- " + URL, E);
            JsonData result = JsonData.fail(defaultMsg);
            mv = new ModelAndView("exception", result.toMap());//对应exception.jsp
        }else {
            log.error("-----unknow other exception! url-----" + url,e);
            JsonData result = JsonData.fail(defaultMsg);
            mv = new ModelAndView("jsonView", result.toMap());//默认也返回json格式
        }
        return mv;
    }
}

spring-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http: // www .springframework.org / Schema / context / the Spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd " > 
    <! - context annotation -> 
    <context: annotation-config /> 
    ! <- start of the drive spring mvc functional annotation -> 
    <MVC: annotation-driven /> 
    
    ! <- pack scan start -> 
    <context: Scan-Component Base -package = " com.mmall.controller " /> 
    <context: Scan-Component Base -package = " com.mmall.service"/> 


    <! - Exception class management SpringExceptionResolver -> 
    <the bean class = " com.mmall.common.SpringExceptionResolver " />     
    <! - the bean @RequestMapping -> <! - a need to adapt Handler - > 
    <the bean class = " org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping " /> 
    <-! returns the requested process -> 
    <the bean class = " org.springframework.web.servlet.view. BeanNameViewResolver " /> 
    <the bean ID = " JSONView "  class = "org.springframework.web.servlet.view.json.MappingJackson2JsonView" />
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"/>
        <property name="suffix" value=".jsp" />
    </bean>
</beans>