SpringMVC | 异常处理

异常处理

1.在SpringMVC配置文件（springMVC.xml）中做以下配置：

<!-- 异常处理 -->
<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
    <property name="exceptionMappings">
        <props>
            <prop key="java.lang.NullPointerException">error</prop>
        </props>
    </property>
</bean>

2.index.jsp

<a href="testException">测试异常</a>

3.TestExceptionController.java

package com.atguigu.controller;

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

@Controller
public class TestExceptionController {
    @RequestMapping(value="/testException", method=RequestMethod.GET)
    public String testException(){
        String s = null;
        System.err.println(s.substring(0, 5));
        return "success";
    }
}

4.error.jsp

<a href="">操作异常，请稍后重试</a>

${exception}

5.运行结果