35.4、SpringMVC_异常处理

 

 

 

<?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 http://www.springframework.org/schema/mvc/spring-mvc.xsd">

<!--    配置注解扫描-->
    <context:component-scan base-package="com.hhh.web.controller"/>

<!--    配置注解驱动-->
    <mvc:annotation-driven/>

<!--    配置试图解析器-->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

配置前端控制器：

 修改TomCat的目录为根目录：

 

 

 

package com.hhh.web.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/user")
public class UsersController {

    @RequestMapping("/getUsers")
    public String getUsers(){
//        String str = null;
//        str.length(); //这里会出现空指针异常

        int[] arr = new int[1];
        arr[2] = 10; //这里会出现数组越界问题
        return "showuser";
    }

    /**
     * 用来处理空指针异常的
     * @param e
     * @param model
     * @return
     */
    @ExceptionHandler({java.lang.NullPointerException.class})
    public String NullPointExceptionHandle(Exception e, Model model){
        model.addAttribute("msg",e);
        return "error";
    }

    /**
     * 这里处理上面定义好的异常外的所有异常问题
     * @param e
     * @param model
     * @return
     */
    @ExceptionHandler({java.lang.Exception.class})
    public String ExceptionHandle(Exception e,Model model){
        model.addAttribute("msg",e);
        return "error2";
    }
}