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  • SpringMVC之HelloWorld

    SpringMVC概述

    SpringMVC是优秀的MVC框架之一,通过一套MVC注解,让POJO成为处理请求的控制器,无须实现任何借口。
    SpringMVC支持REST风格的URL请求,采用了松散耦合可插拔组件结构,比其他MVC框架更具扩展性和灵活性。

    下面使用IDEA创建一个SpringMVC项目,项目结构如下:

    HelloWorldController是一个控制器,用于处理请求:

    package com.led.controller;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    /**
     * @author Alan
     * @date 2018/5/23 22:07
     * @Controller:表明这个是一个控制器
     * @RequestMapping:映射请求的路径
     * 返回值会通过视图解析器解析为实际的物理视图,对于InternalResourceViewResolver 视图解析器,会做如下解析:
     * 通过 prefix + returnval + 后缀的方式得到实际的物理视图,然后做转发操作
     * /WEB-INF/views/success.jsp
     */
    @Controller
    public class HelloWorldController {
        @RequestMapping("/helloWorld")
        public String helloWorld(){
            System.out.println("hello world");
            return "success";
        }
    }

    web.xml(项目的整体配置文件):

    <?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>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/applicationContext.xml</param-value>
        </context-param>
        <listener>
            <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
        </listener>
        <!--配置DispatcherServlet-->
        <servlet>
            <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>
    </web-app>
    dispatcher-servlet.xml(SprimgMVC相关的配置文件):
    <?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:context="http://www.springframework.org/schema/context"
           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">
        <!--配置自动扫描的包-->
        <context:component-scan base-package="com.led.controller"/>
        <!--配置视图解析器,把handler方法返回值解析为实际的视图-->
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/views/"/>
            <property name="suffix" value=".jsp"/>
        </bean>
    </beans>

    applicationContext.xml(Spring的整体配置文件):

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    
    </beans>

    success.jsp(视图呈现页面):

    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
        <h4>Success page</h4>
    </body>
    </html>

    运行项目,浏览器输入http://localhost:8080/springmvc/,点击超链接,会显示

    Success page

    SpringMVC运行原理图:

    
    
     
     
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  • 原文地址:https://www.cnblogs.com/stm32stm32/p/9085765.html
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