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;
    }
}

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
    }
   
}

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
    }
 
}

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
    }
   
}

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>40) {
            throw new AgeException("年龄太大");
        }
        
        return "/WEB-INF/jsp/index.jsp";
    }
}

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>

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>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>

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