第一个注解式的SpringMVC项目

1.导入jar
1)导入Spring的四个核心jar。 spring-beans.jar ,spring-core.jar, spring-context.jar, spring-expression.jar
2)日志的jar 。 commons-logging.jar
3)SpringMVC中jar ， spring-context-support:工具类，UI，缓存类
spring-webmvc.jar : SpringMVC框架的实现包。
两个jar都位于Spring的核心文件夹/libs/
4)注解式开发需要spring-aop.jar 。 位于Spring核心文件夹/libs/spring-aop.jar

2.定义SpringMVC的配置文件，配置文件和Spring的是一样
注册组件扫描器<context>标签。 引入spring-context.xsd约束文件

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

    <!-- 注册组件扫描器 -->
    <context:component-scan base-package="com.sinosoft.controllers"/>
    
    <!-- 注册视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

3.在web.xml注册中央调度器（DispatcherServlet）。

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>01</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
  <!-- 注册中央调度器 -->
  <servlet>
      <servlet-name>springmvc01</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      
      <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath:springmvc.xml</param-value>
      </init-param>
      
      <load-on-startup>1</load-on-startup>
  </servlet>
  
  <servlet-mapping>
      <servlet-name>springmvc01</servlet-name>
      <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
  
</web-app>

4.定义处理器，接收用户的请求。对请求作出处理。
@Controller:表示处理器类
@RequestMapping:在方法上定义处理器方法处理的请求URI，在类上定义命名空间

package com.sinosoft.controllers;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping(value="/user")
public class MyController {
    
    @RequestMapping(value={"/some.do","/two.do"})
    public ModelAndView doSome(){
        ModelAndView mv = new ModelAndView();
        mv.addObject("msg","doSome annotion SpringMVC");
        mv.setViewName("show");
        return mv;
    }
    
    @RequestMapping(value="/other.do")
    public ModelAndView doOther(){
        ModelAndView mv = new ModelAndView();
        mv.addObject("msg","doOther annotion SpringMVC");
        mv.setViewName("show");
        return mv;
    }
    
}

5)定义显示处理结果的页面（视图）