SpringMvc学习笔记(十)异常处理专题

xiaoxiao2021-03-01  14

遇见异常跳转到自己设置的页面,注解方式处理局部异常,监听Controller类的全局异常处理,springmvc配置统一的简单异常处理,监听所有的页面异常

源码获取github

1.项目结构

2.局部异常处理

ExceptionDemoController.java

package com.hs.web; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.ExceptionHandler; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.servlet.ModelAndView; /** * 经典异常处理_注解方式 */ @Controller public class ExceptionDemoController { @GetMapping("/ex01") public String test01() { int i = 10 / 0; //会报这个错误Request processing failed; nested exception is java.lang.ArithmeticException: / by zero return "jsp/result"; } /** * 注解方式,处理异常,程序遇见这个异常,就会执行注解里的内容, *作用范围只有本类有效!!! * @return */ //里面可以写多个异常,用,隔开,,,其实也可以总的写一个异常Exception,class @ExceptionHandler(value = {ArithmeticException.class}) public ModelAndView exception01(ArithmeticException ex) { ModelAndView mav = new ModelAndView(); mav.addObject("ex", ex); mav.setViewName("jsp/error"); return mav; } }

error.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <h2>${requestScope.message}</h2> <a href="javascript:void(0)" id="debug">[DEBUG]</a> <p id="error" style="display: none"> ${requestScope.ex} </p> <script> window.onload = function () { document.getElementById("debug").onclick = function () { document.getElementById("error").style.display = "block"; } } </script> </body> </html>

3.@ControllerAdvice监听所有Controller类的异常

ExceptionAllController.java

package com.hs.web; import org.springframework.web.bind.annotation.ControllerAdvice; import org.springframework.web.bind.annotation.ExceptionHandler; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.servlet.ModelAndView; import java.util.HashMap; import java.util.Map; /** * ControllerAdvice这个表示监听只要有Controller的类的异常,同样如果自身类有注解监听,满足谁近就运行谁的原则 */ @ControllerAdvice public class ExceptionAllController { /** * 监听Controller类的异常方式一 * * @param ex * @return */ @ExceptionHandler(value = {Exception.class}) public ModelAndView exception01(Exception ex) { ModelAndView mav = new ModelAndView(); mav.addObject("ex", ex); mav.setViewName("jsp/error02"); return mav; } }

ExceptionDemoController.java把上面那个局部处理异常注释就行,

error02.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> 本页是全局的异常监听跳转页面,本次监听到的异常是 ${requestScope.ex} </body> </html>

4.springmvc.xml配置简单处理异常

springmvc.xml加入

<!--6.统一的简单异常处理,监听所有的页面异常--> <bean id="simpleMappingExceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver"> <!--出现异常,默认跳转的页面--> <property name="defaultErrorView" value="jsp/error"/> <!--类似于这个mav.addObject("ex", ex);--> <property name="exceptionAttribute" value="ex"/> <!--异常映射,若出现下列异常,就跳转相应的页面,不跳默认的--> <property name="exceptionMappings"> <props> <prop key="ArithmeticException">jsp/error</prop> <prop key="ArrayIndexOutOfBoundsException">jsp/error</prop> <prop key="RuntimeException">jsp/error</prop> <prop key="Exception">jsp/error</prop> </props> </property> </bean>

5.自定义处理异常

ExceptionAllController.java

/** * 监听Controller类的异常方式二自定义异常 * @param ex * @param model * @return */ @ExceptionHandler(value = {Exception.class}) public String exception02(Exception ex, Model model) { //判断类的类型 if (ex instanceof ArrayIndexOutOfBoundsException) { model.addAttribute("message", "数组越界异常");//给客户看的 model.addAttribute("ex", ex); // return "jsp/error"; } if (ex instanceof ArithmeticException) { model.addAttribute("message", "运算异常"); //给客户看的 model.addAttribute("ex", ex); // return "jsp/error"; } //处理自定义异常 return "jsp/error"; } /** * 监听Controller类的异常方式二自定义异常____返回json格式 * @param ex * @return */ @ExceptionHandler(value = {Exception.class}) @ResponseBody public Map<String,Object> exception03(Exception ex) { Map<String, Object> map = new HashMap<String,Object>(); //判断类的类型 if (ex instanceof ArrayIndexOutOfBoundsException) { map.put("message", "数组越界异常");//给客户看的 map.put("ex", ex); // return "jsp/error"; } if (ex instanceof ArithmeticException) { map.put("message", "运算异常"); //给客户看的 map.put("ex", ex); // return "jsp/error"; } //处理自定义异常 return map; }

result.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> 没有遇见注解里的异常,成功跳转 </body> </html>
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