SpringMVC 简单使用

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SpringMVC 用于接收前端请求并回送响应，DispatcherServlet负责根据请求的不同交与对应的Controller进行处理，Controller处理后回送View信息，ViewResolver 解析出相应的View视图然后DispatcherServlet响应给前端。

项目结构图：
SpringMVC简单应用项目图

lib：
SpringMVC依赖Jar包

前端展示信息index.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Hello SpringMVC</title></head><body>    <a href="helloSpring">Hello SpringMVC</a>    <a href="springBackup">Hello SpringMVC</a></body></html>

配置信息：

/WEB-INF/web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xmlns="http://java.sun.com/xml/ns/javaee"    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"    id="WebApp_ID" version="2.5">    <!-- 配置DispatchcerServlet -->    <servlet>        <servlet-name>springDispatcherServlet</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <!-- 配置Spring mvc下的配置文件的位置和名称，默认为/WEB-INF/[servlet-name]-servlet.xml -->        <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>        <!-- 处理所有请求 -->        <servlet-name>springDispatcherServlet</servlet-name>        <url-pattern>/</url-pattern>    </servlet-mapping>     <!--  修改SpringMVC配置文件路径的另一种方式    <context-param>       <param-name>contextConfigLocation</param-name>       <param-value>classpath:springmvc.xml</param-value>    </context-param>    <listener>       <listener-class>          org.springframework.web.context.ContextLoaderListener       </listener-class>    </listener>    --></web-app>

src/springmvc.xml（src目录下的文件发布时会放在 WebContent/WEB-INF/classes 下，即classpath）

<?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: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-4.0.xsd        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">        <!-- 配置自动扫描的包（扫描Annotation） -->        <context:component-scan base-package="com.sxt.springmvc"></context:component-scan>        <!-- 配置视图解析器 如何把handler 方法返回值解析为实际的物理视图 -->        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">            <!-- view的路径 -->            <property name = "prefix" value="/WEB-INF/views/"></property>            <!-- view的后缀 -->            <property name = "suffix" value = ".jsp"></property>        </bean></beans>

java代码：

package com.sxt.springmvc.handlers;import org.springframework.stereotype.Controller;import org.springframework.ui.ModelMap;import org.springframework.web.bind.annotation.RequestMapping;/** *  * Controller类 * @author MoralIntegrity */@Controllerpublic class SpringHello {    /*     *  请求为helloSpring时的处理方法     */    @RequestMapping("/helloSpring")    public String hello(ModelMap model){        System.out.println("hello SpringMVC");        model.addAttribute("info", "hello SpringMVC ,I am a coder.");        //会根据springmvc.xml的配置，解析出/WEB-INF/views/hello.jsp视图        return "hello";    }    /*     *  请求为springBackup时的处理方法     */    @RequestMapping("/springBackup")    public String backup(){        System.out.println("back used.");        //会根据springmvc.xml的配置，解析出/WEB-INF/views/hello.jsp视图        return "hello";    }}

hello.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8 "    pageEncoding="UTF-8" isELIgnored="false"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>SpringMVC</title></head><body><h4><!-- helloSpring请求时会显示出EL表达式的信息， springBackup请求不会-->${info}</h4></body></html>

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