Spring Mvc 入门Demo

1、web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <context-param>   --Spring Controller 配置
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/dispatcher-servlet.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <servlet>  --Spring mvc 默认调度
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>sh</servlet-name>
        <url-pattern>/servlet/sh</url-pattern>
    </servlet-mapping>
</web-app>

load-on-startup：表示启动容器时初始化该Servlet；

url-pattern：表示哪些请求交给Spring Web MVC处理，配置Spring的配置文件，默认DispatcherServlet会加载WEB-INF/[DispatcherServlet的Servlet名字]-servlet.xml配置文件.

2、dispatcher-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<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.javahash.spring.controller"></context:component-scan>   --配置扫描包
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value=""></property>     --路径前缀
        <property name="suffix" value=".jsp"></property> --路径后缀
    </bean>
</beans>

3、Controller 代码

package com.javahash.spring.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.logging.Logger;

/**
 * Created by Administrator on 2014/11/8.
 */
@Controller
public class HelloWorldController {

    @RequestMapping("/hello")
    public String hello(@RequestParam(value="name", required=false, defaultValue="World") String name, Model model) {
        model.addAttribute("name", name);
        return "helloworld";
    }
}