Spring MVC环境搭建和配置

1. 创建Dynamic web project

2. 修改WEB-INF/web.xml,内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
        http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <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/applicationContext.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>springMvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>  

3. 创建/WEB-INF/applicationContext.xml,添加如下内容：

    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        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">  

        <context:component-scan base-package="com.vito.action" />  

        <bean
            class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix">
                            <!-- 这个配置是配置JSP页面的位置，按照你自己的配置来配 -->
                <value>/WEB-INF/view/</value>
            </property>
            <property name="suffix">
                <value>.jsp</value>
            </property>
        </bean>  

    </beans>  

4. 创建java文件，注意package名字

package com.vito.action;  

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;  

@Controller
@RequestMapping("/welcome")
public class HelloWorldController {
    @RequestMapping(value="/hello",method = RequestMethod.GET)
    public String printWelcome(ModelMap model) {
        model.addAttribute("message", "Spring 3 MVC Hello World");
        return "hello";
    }
} 

5. 【关键】创建WEB-INF/lib,将如下jar包导入，注意不要填加多余的包。由于之前将所有的sping jar包导入，导致出错，找原因花了一天时间。

6. 将上面的jar加入build path

7. 试试http://localhost:8080/DemoSpringMVC/welcome/hello 吧！