spring mvc 第四天【注解实现springmvc 配合使用Exception Resolver 的配置】

Tips：这里使用具体springmvc的异常处理只是拿一个简单的案例来说明问题，并不做实用，如有需求可做更改；

这里演示的仅是能够实现service验证的一种方案，如有更好的请留言我会努力学习!!

之前有项目需求不光前台js验证，还需后台支持验证才行，使用了该方式来解决问题，这里做一下总结；

今天的案例说明：用户在前台发出请求，后台判定该请求中的数据是否【合法】，如不合法，返回给用户 相应的提示；

本人思路：从后台开始吧，更加的能够说明问题；

文档结构图：

01.定义实体类UserInfo

 package cn.happy.entity;

 public class UserInfo {
     private String name;
     private int age;

     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public int getAge() {
         return age;
     }
     public void setAge(int age) {
         this.age = age;
     }
 }

UserInfo

02.定义三个异常处理类AgeException NameException UserInfoException

 package cn.happy.exceptions;

 public class UserInfoException extends Exception {

     public UserInfoException() {
         super();
         // TODO Auto-generated constructor stub
     }

     public UserInfoException(String message) {
         super(message);
         // TODO Auto-generated constructor stub
     }

 }

UserInfoException

 package cn.happy.exceptions;

 public class AgeException extends UserInfoException {

     public AgeException() {
         super();
         // TODO Auto-generated constructor stub
     }

     public AgeException(String message) {
         super(message);
         // TODO Auto-generated constructor stub
     }

 }

AgeException

 package cn.happy.exceptions;

 public class NameException extends UserInfoException{

     public NameException() {
         super();
         // TODO Auto-generated constructor stub
     }

     public NameException(String message) {
         super(message);
         // TODO Auto-generated constructor stub
     }

 }

NameException

03.定义Controller

 package cn.happy.controller;

 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 import cn.happy.exceptions.AgeException;
 import cn.happy.exceptions.NameException;
 import cn.happy.exceptions.UserInfoException;

 @Controller
 public class MyController {
    //处理器方法
     @RequestMapping(value="/first.do")
     public String doFirst(String name,int age) throws UserInfoException{

         if (!"admin".equals(name)) {
             throw new NameException("用户名错误");
         }

         if (age>) {
             throw new AgeException("年龄太大");
         }

         return "/WEB-INF/jsp/index.jsp";
     }
 }

MyController

04.定义applicationcontext.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:aop="http://www.springframework.org/schema/aop"
     xmlns:tx="http://www.springframework.org/schema/tx"
     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 http://www.springframework.org/schema/context/spring-context.xsd
         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
         http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
         ">

      <!-- 包扫描器 -->
      <context:component-scan base-package="cn.happy.controller"></context:component-scan>

     <!-- 注册系统异常处理器 -->
      <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
         <property name="defaultErrorView" value="errors.jsp"></property>
         <property name="exceptionAttribute" value="ex"></property>

         <property name="exceptionMappings">
            <props>
               <prop key="cn.happy.exceptions.NameException">error/nameerrors.jsp</prop>
               <prop key="cn.happy.exceptions.AgeException">error/ageerrors.jsp</prop>
            </props>
         </property>
      </bean>

 </beans>

applicationcontext.xml

05.配置web.xml

     <servlet-name>springmvc</servlet-name>
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <init-param>
       <param-name>contextConfigLocation</param-name>
       <param-value>classpath:applicationContext.xml</param-value>
     </init-param>
     <load-on-startup></load-on-startup>
   </servlet>
   <servlet-mapping>
     <servlet-name>springmvc</servlet-name>
     <url-pattern>*.do</url-pattern>
   </servlet-mapping>

web.xml

前台请求触发对应异常跳转到对应页面；源码已上传至

https://git.oschina.net/zymqqc/springmvc-code.git