SpringMVC 的入门案例

创建WEB工程，引入开发的jar包

具体的坐标如下：

<properties>
	<spring.version>5.0.2.RELEASEspring.version>
properties>
<dependencies>
	<dependency>
		<groupId>org.springframeworkgroupId>
		<artifactId>spring-contextartifactId>
		<version>${spring.version}version>
	dependency>
	<dependency>
		<groupId>org.springframeworkgroupId>
		<artifactId>spring-webartifactId>
		<version>${spring.version}version>
	dependency>
	<dependency>
		<groupId>org.springframeworkgroupId>
		<artifactId>spring-webmvcartifactId>
		<version>${spring.version}version>
	dependency>
	<dependency>
		<groupId>javax.servletgroupId>
		<artifactId>servlet-apiartifactId>
		<version>2.5version>
		<scope>providedscope>
	dependency>
	<dependency>
		<groupId>javax.servlet.jspgroupId>
		<artifactId>jsp-apiartifactId>
		<version>2.0version>
		<scope>providedscope>
	dependency>
dependencies>

在web.xml配置文件中核心控制器DispatcherServlet

<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">

<servlet>
	<servlet-name>SpringMVCDispatcherServletservlet-name>
	<servlet-class>
		org.springframework.web.servlet.DispatcherServlet
	servlet-class>
	
	<init-param>
		<param-name>contextConfigLocationparam-name>
		<param-value>classpath:SpringMVC.xmlparam-value>
	init-param>
	
	<load-on-startup>1load-on-startup>
servlet>
<servlet-mapping>
	<servlet-name>SpringMVCDispatcherServletservlet-name>
	<url-pattern>/url-pattern>
servlet-mapping>

创建 spring mvc 的配置文件

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
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.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
	
	<context:component-scan base-package="com.itheima">context:component-scan>
	
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/pages/">property>
		<property name="suffix" value=".jsp">property>
	bean>
beans>

编写控制器并使用注解配置

@Controller("helloController")
public class HelloController {
    @RequestMapping("/hello")
    public String sayHello() {
        System.out.println("HelloController 的 sayHello 方法执行了。。。。 ");
        return "success";
    }
}

测试

入门案例的执行过程及原理分析

案例的执行过程

1、服务器启动，应用被加载。 读取到 web.xml 中的配置创建 spring 容器并且初始化容器中的对象。

• 从入门案例中可以看到的是： HelloController 和 InternalResourceViewResolver，但是远不止这些。