springMVC3学习(一)--框架搭建

本人是基于3.1.1版本开发，如遇jar包版本冲突等其他问题，概不负责。

一：新建web工程，spring001

忽略

二：添加springframework依赖jar包

将dist下的jar全部加进去  然后另加一个commons-logging.jar

三：修改web.xml

 <servlet>
     <servlet-name>springMVC</servlet-name>
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <init-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>/WEB-INF/config/springMVC.xml</param-value>
     </init-param>
     <load-on-startup>1</load-on-startup>
 </servlet>

 <servlet-mapping>
     <servlet-name>springMVC</servlet-name>
     <url-pattern>/</url-pattern>
 </servlet-mapping>

默认DispatcherServlet会加载WEB-INF/[DispatcherServlet的Servlet名字]-servlet.xml配置文件，

本示例为WEB-INF/springMVC-servlet.xml

默认路径为WEB-INF下,也可修改为如下配置

 <init-param>
     <param-name>contextConfigLocation</param-name>
     <!-- <param-value>classpath:conf/springMVC.xml</param-value>  -->
     <!-- <param-value>classpath:/conf/springMVC.xml</param-value> -->
     <!-- <param-value>classpath*:/conf/springMVC.xml</param-value>  -->
     <!-- 以上三种形式也可以 -->
     <param-value>classpath:conf/springMVC.xml</param-value>
 </init-param>

四：添加springMVC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:p="http://www.springframework.org/schema/p"
     xmlns:context="http://www.springframework.org/schema/context"
     xmlns:mvc="http://www.springframework.org/schema/mvc"
     default-lazy-init="true"
     xsi:schemaLocation="
     http://www.springframework.org/schema/beans
     http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
     http://www.springframework.org/schema/context
     http://www.springframework.org/schema/context/spring-context-3.0.xsd
     http://www.springframework.org/schema/mvc
     http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
     ">

     <!-- 默认扫描的包路径 -->
     <context:component-scan base-package="com.itmyhome" />

     <!-- 添加注解驱动 -->
     <mvc:annotation-driven />

     <!-- 定义跳转的文件的前后缀 -->
     <bean id="viewResolver"
         class="org.springframework.web.servlet.view.InternalResourceViewResolver">
         <property name="prefix" value="/" />  <!-- 默认放在WebRoot下 -->
         <property name="suffix" value=".jsp" />
     </bean>
 </beans>

PS：<context:component-scan base-package="com.itmyhome" />

base-package后的内容只是包路径，千万不能把类名也写出来 比如com.itmyhome.Login

否则会报如下错误

警告: No mapping found for HTTP request with URI [/spring001/login] in DispatcherServlet with name 'springMVC'

五：后台Action

 package com.itmyhome;

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

 @Controller
 public class Login {

     @RequestMapping(value="login")
     public String login(){
         System.out.println("*******已经进入*********");
         return "welcome";  //即返回welcome.jsp
     }
 }

六：返回JSP

新建welcome.jsp 里面随便写点内容 如：Hello springMVC!

最后在浏览器中输入地址 验证 如图：

工程目录如下：