1 HelloWorld

SpringMVC运行流程：

图片说明

步骤
1. 导入jar包。
2. 在web.xml中配置DispatcherServlet。
3. 加入SpringMVC配置文件。
4. 编写处理请求的处理器，并标识为处理器。
5. 编写视图。

项目结构：

图片说明

1、导入jar包

aopalliance-1.0.jar
META-INF
aopalliance
commons-logging-1.2.jar
spring-aop-5.2.3.RELEASE.jar
spring-aspects-5.2.3.RELEASE.jar
spring-beans-5.2.3.RELEASE.jar
spring-context-5.2.3.RELEASE.jar
spring-context-support-5.2.3.RELEASE.jar
spring-core-5.2.3.RELEASE.jar
spring-expression-5.2.3.RELEASE.jar
spring-instrument-5.2.3.RELEASE.jar
spring-jdbc-5.2.3.RELEASE.jar
spring-jms-5.2.3.RELEASE.jar
spring-messaging-5.2.3.RELEASE.jar
spring-orm-5.2.3.RELEASE.jar
spring-oxm-5.2.3.RELEASE.jar
spring-test-5.2.3.RELEASE.jar
spring-tx-5.2.3.RELEASE.jar
spring-web-5.2.3.RELEASE.jar
spring-webmvc-5.2.3.RELEASE.jar

2、配置web.xml

<?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_4_0.xsd"
         version="4.0">
    <!--Spring配置文件-->
    <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>

    <!--SpringMVC配置文件-->
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--配置SpringMVC配置文件的位置：/WEB-INF/<servlet-name>-servlet.xml为默认位置-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/dispatcher-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <!--映射请求，所有请求都交由dispatcher处理-->
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

3、配置dispatcher-servlet.xml

<?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 https://www.springframework.org/schema/context/spring-context.xsd">

    <!--配置SpringMVC扫描的包，设置为只扫描@Controller注解-->
    <context:component-scan base-package="com.xianhuii" use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"></context:include-filter>
    </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">
        <property name="prefix" value="/WEB-INF/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

</beans>

4、编写Controller

package com.xianhuii;

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

@Controller
public class HellWorld {
    /**
     * 1、使用@RequestMapping注解来映射请求的URL
     * 2、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 + suffix，得到实际的物理视图，然后进行转发。
     *      /WEB-INF/views/success.jsp
     * @return
     */
    @RequestMapping("/helloworld")
    public String hello() {
        System.out.println("helloworld");
        return "success";
    }
}

5、编写视图

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>

  <head>
    <title>$Title$</title>
  </head>

  <body>
  <a href="/helloworld">Hello World</a>
  </body>
</html>

success.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>

<head>
    <title>成功</title>
</head>

<body>

<h4>Success Page</h4>

</body>
</html>