SpringBoot 2.x 统一异常处理-白红宇

SpringBoot 2.x 统一异常处理

阅读量：2388 次

发布时间：2019-05-10

本文共 9509 字，大约阅读时间需要 31 分钟。

1、统一异常处理类

package cn.hadron.controller;import org.springframework.web.bind.annotation.ControllerAdvice;import org.springframework.web.bind.annotation.ExceptionHandler;import org.springframework.web.bind.annotation.ResponseBody;import javax.servlet.http.HttpServletRequest;import java.util.HashMap;import java.util.Map;/** * 统一异常处理类 */@ControllerAdvicepublic class GlobalExceptionHandler {    /**     * 返回的Map对象会被@ResponseBody注解转换为JSON数据返回     * @return     */    @ExceptionHandler(Exception.class)    @ResponseBody    public Object handleException(HttpServletRequest request,Exception e){        System.out.println("###出现异常！");        Map
   
     map=new HashMap<>();        map.put("url",request.getRequestURL().toString());        map.put("msg",e.getMessage());        return map;    }}

2、异常测试控制器

package cn.hadron.controller;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;@Controllerpublic class PathController extends BaseController{    /**     * 异常处理测试     */    @RequestMapping("/test")    @ResponseBody    public String test(String name) throws Exception{        System.out.println("异常处理测试！");        if(name==null) {            throw new Exception("字段空值");        }        return "index";    }}

3、页面

在这里插入图片描述

4、提醒

提醒，我们自定的@RequestMapping值不能为error,

比如

@RequestMapping("/error")    @ResponseBody    public String error(String name) throws Exception{        System.out.println("异常处理测试！");        if(name==null) {            throw new Exception("字段空值");        }        return "index";    }

报异常如下，提示SpringBoot的org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error方法无法映射。

2019-03-05 14:08:40.286  WARN 11068 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'basicErrorController' method public org.springframework.http.ResponseEntity
   
    
     > org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)to { /error}: There is already 'pathController' bean methodpublic java.lang.String cn.hadron.controller.PathController.error(java.lang.String) throws java.lang.Exception mapped.2019-03-05 14:08:40.286  INFO 11068 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'2019-03-05 14:08:40.290  INFO 11068 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]2019-03-05 14:08:40.311  INFO 11068 --- [           main] ConditionEvaluationReportLoggingListener : Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.2019-03-05 14:08:40.324 ERROR 11068 --- [           main] o.s.boot.SpringApplication               : Application run failedorg.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'basicErrorController' method public org.springframework.http.ResponseEntity
     
      
       > org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)to { /error}: There is already 'pathController' bean methodpublic java.lang.String cn.hadron.controller.PathController.error(java.lang.String) throws java.lang.Exception mapped.	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1745) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:576) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:846) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863) ~[spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) ~[spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]	at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]	at cn.hadron.DbApplication.main(DbApplication.java:23) [classes/:na]Caused by: java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'basicErrorController' method public org.springframework.http.ResponseEntity
       
        
         > org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)to { /error}: There is already 'pathController' bean methodpublic java.lang.String cn.hadron.controller.PathController.error(java.lang.String) throws java.lang.Exception mapped. at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping$MappingRegistry.assertUniqueMethodMapping(AbstractHandlerMethodMapping.java:621) ~[spring-webmvc-5.1.4.RELEASE.jar:5.1.4.RELEASE] at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping$MappingRegistry.register(AbstractHandlerMethodMapping.java:589) ~[spring-webmvc-5.1.4.RELEASE.jar:5.1.4.RELEASE] at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.registerHandlerMethod(AbstractHandlerMethodMapping.java:315) ~[spring-webmvc-5.1.4.RELEASE.jar:5.1.4.RELEASE] at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.lambda$detectHandlerMethods$1(AbstractHandlerMethodMapping.java:282) ~[spring-webmvc-5.1.4.RELEASE.jar:5.1.4.RELEASE] at java.util.LinkedHashMap.forEach(LinkedHashMap.java:684) ~[na:1.8.0_181] at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.detectHandlerMethods(AbstractHandlerMethodMapping.java:280) ~[spring-webmvc-5.1.4.RELEASE.jar:5.1.4.RELEASE] at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.processCandidateBean(AbstractHandlerMethodMapping.java:252) ~[spring-webmvc-5.1.4.RELEASE.jar:5.1.4.RELEASE] at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.initHandlerMethods(AbstractHandlerMethodMapping.java:211) ~[spring-webmvc-5.1.4.RELEASE.jar:5.1.4.RELEASE] at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.afterPropertiesSet(AbstractHandlerMethodMapping.java:199) ~[spring-webmvc-5.1.4.RELEASE.jar:5.1.4.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.afterPropertiesSet(RequestMappingHandlerMapping.java:164) ~[spring-webmvc-5.1.4.RELEASE.jar:5.1.4.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1804) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1741) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE] ... 16 common frames omittedProcess finished with exit code 1