简单异常处理器-优快云博客

本文链接：https://blog.youkuaiyun.com/m0_73903724/article/details/144207898

ExceptionController类

package com.hkd.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.ArrayList;
@Controller
public class ExceptionController {
    @RequestMapping("/showNullPointer")
    public void showMullPoint(){
        ArrayList<Object> list=null;
        System.out.println(list.get(2));
    }
    @RequestMapping("/showIOException")
    public void showIOException() throws FileNotFoundException {
        FileInputStream inputStream=new FileInputStream("bean.xml");
    }
    @RequestMapping("/NushowArithmetic")
    public void showArithmetic(){
     int c=1/0;
    }
}

spring-mvc.xml文件

<?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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<context:component-scan base-package="com.hkd.controller"/>
    <mvc:annotation-driven/>
    <mvc:default-servlet-handler/>
    <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
        <property name="exceptionMappings">
            <props>
                <prop key="java.lang.NullPointerException">nullPointerExp.jsp</prop>
                <prop key="IOException">IOExp.jsp</prop>
            </props>
        </property>
        <property name="defaultErrorView" value="defaultExp.jsp"/>
        <property name="exceptionAttribute" value="exp"></property>
    </bean>
</beans>

web.xml中的内容

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
<servlet>
    <servlet-name>DispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring-mvc.xml</param-value>
    </init-param>
</servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

defaultExp.jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
默认异常处理页面--------${exp}
</body>
</html>
index.jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>欢迎</h1>
</body>
</html>

IOExp.jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>

IO异常处理页面-------${exp}
</body>
</html>

nullPointerExp.jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
空指针异常处理页面--------${exp}
</body>
</html>

spring-mvc所需依赖及插件tomcat