SSM-SpringMVC-26：SpringMVC异常骇级之自定义异常注解版

------------吾亦无他,唯手熟尔，谦卑若愚，好学若饥-------------

注解的方法实现异常解析，话不多说，直接搞起，和以前一样的习惯，和上篇博客一样的代码放后面，不一样的在前面

案例：

　　1.自定义处理器和处理方法

package cn.dawn.day18annotationexception;

import cn.dawn.day18annotationexception.userexception.UserageException;

import cn.dawn.day18annotationexception.userexception.UsernameException;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.ExceptionHandler;

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

import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * Created by Dawn on 2018/3/28.

 */

@Controller

public class ZDYExceptionController {

    /*作用于这俩个*/

    @ExceptionHandler({UsernameException.class,UserageException.class})

    public ModelAndView resolveException(Exception ex) {

        ModelAndView modelAndView=new ModelAndView();

        /*返回的异常对象*/

        modelAndView.addObject("ex",ex);

        /*判断去那个页面*/

        if(ex instanceof UsernameException){

            modelAndView.setViewName("name");

        }

        if(ex instanceof UserageException){

            modelAndView.setViewName("age");

        }

        return modelAndView;

    }

    @RequestMapping("/annotationException")

    public String annotationException(String username,Integer userage) throws Exception {

        if(!username.equals("admin")){

            throw new UsernameException("登陆名不正确");

        }

        if(userage<){

            throw new UserageException("未成年，走开");

        }

        return "success";

    }

}

　　2.自己的xml大配置文件

<?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:mvc="http://www.springframework.org/schema/mvc"

       xmlns:context="http://www.springframework.org/schema/context"

       xsi:schemaLocation="http://www.springframework.org/schema/beans

        http://www.springframework.org/schema/beans/spring-beans.xsd

        http://www.springframework.org/schema/mvc

        http://www.springframework.org/schema/mvc/spring-mvc.xsd

         http://www.springframework.org/schema/context

         http://www.springframework.org/schema/context/spring-context.xsd">

    <!--包扫描器-->

    <context:component-scan base-package="cn.dawn.day18annotationexception"></context:component-scan>

    <!--视图解析器-->

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="/day18/"></property>

        <property name="suffix" value=".jsp"></property>

    </bean>

</beans>

　　3.修改web.xml的*调度器的上下文配置路径

　　4.login.jsp

<%@ page  pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false"  %>

<html>

<head>

    <title>Title</title>

</head>

<body>

<h2>登录</h2>

<form action="${pageContext.request.contextPath}/annotationException" method="post">

    用户名:<input name="username">

    年龄:<input name="userage">

    <input type="submit" value="登录"/>

</form>

</body>

</html>

下面的内容与上篇博客相同

　5.UserageException自定义异常

package cn.dawn.day17selfexceptionresolver.userexception;

/**

 * Created by Dawn on 2018/3/30.

 */

public class UserageException extends Exception {

    public UserageException() {

        super();

    }

    public UserageException(String message) {

        super(message);

    }

}

　　6.UsernameException自定义异常

package cn.dawn.day17selfexceptionresolver.userexception;

/**

 * Created by Dawn on 2018/3/30.

 */

public class UsernameException extends Exception {

    public UsernameException() {

        super();

    }

    public UsernameException(String message) {

        super(message);

    }

}

　　7.jsp页面

　　　　7.1success.jsp

<%@ page language="java" pageEncoding="utf-8" isELIgnored="false" %>

<html>

<body>

<%--<img src="data:image/1.jpg">--%>

<h2>Success!</h2>

</body>

</html>

　　　　7.2error.jsp

<%@ page  pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false"  %>

<html>

<head>

    <title>Title</title>

</head>

<body>

<h2>ERROR</h2>

<p>${ex.message}</p>

服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天

</body>

</html>

　　　　7.3age.jsp

<%@ page  pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false"  %>

<html>

<head>

    <title>Title</title>

</head>

<body>

<h2>年龄错误ERROR</h2>

<p>${ex.message}</p>

服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天

</body>

</html>

　　　　7.4name.jsp

<%@ page  pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false"  %>

<html>

<head>

    <title>Title</title>

</head>

<body>

<h2>名字错误ERROR</h2>

<p>${ex.message}</p>

服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天

</body>

</html>

　　8.启动tomcat，访问login.jsp

秒客网

SSM-SpringMVC-26：SpringMVC异常骇级之自定义异常注解版

相关文章