2. SpringMVC_HelloWorld

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一、步骤：
– 加入 jar 包
– 在 web.xml 中配置 DispatcherServlet
– 加入 Spring MVC 的配置文件
– 编写处理请求的处理器，并标识为处理器
– 编写视图

commons-logging-1.1.1.jar

jstl.jar

spring-aop-4.0.0.RELEASE.jar

spring-beans-4.0.0.RELEASE.jar

spring-context-4.0.0.RELEASE.jar

spring-core-4.0.0.RELEASE.jar

spring-expression-4.0.0.RELEASE.jar

spring-web-4.0.0.RELEASE.jar

spring-webmvc-4.0.0.RELEASE.jar

standard.jar

二、配置 web.xml

配置 DispatcherServlet：DispatcherServlet默认加载/WEBINF/<servletName-servlet>.xml 的 Spring 配置文件, 启动 WEB 层
的 Spring 容器。可以通过 contextConfigLocation初始化参数自定
义配置文件的位置和名称

<servlet-name>dispatcherServlet</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<!--

实际上也可以不通过 contextConfigLocation来配置 SpringMVC的配置文件,而使用默认的.

默认的配置文件为:/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>

<servlet-name>dispatcherServlet</servlet-name>

<url-pattern>/</url-pattern>

</servlet-mapping>

三、springmvc.xml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"
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">

<context:component-scan base-package="com.atguigu.springmvc"></context:component-scan>


<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
</bean>
</beans>

四。

packagecom.atguigu.springmvc.handlers;

importorg.springframework.stereotype.Controller;

importorg.springframework.web.bind.annotation.RequestMapping;

@Controller /**@Controller这样标识就是控制器了。 **/

public class HelloWorld {

/**

* 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,会做如下的解析:

* 通过 prefix + returnVal +后缀这样的方式得到实际的物理视图,然会做转发操作

*/WEB-INF/views/success.jsp

* @return

@RequestMapping("/helloworld") /** servlet请求这里 */

public String hello(){

System.out.println("hello world");

return"success";

}

Success.jsp

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

pageEncoding="UTF-8"%>

<%-- <%@ taglib prefix="fmt"uri="http://java.sun.com/jsp/jstl/fmt"%> --%>

<!DOCTYPEhtmlPUBLIC"-//W3C//DTDHTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<metahttp-equiv="Content-Type"content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

<h4>Sucess Page</h4>

time: ${requestScope.time }

names: ${requestScope.names }

request user: ${requestScope.user}

session user: ${sessionScope.user}

request school:${requestScope.school }

session school:${sessionScope.school }

abc user:${requestScope.abc }

mnxyz user:${requestScope.mnxyz }

<fmt:messagekey="i18n.username"></fmt:message>

<fmt:messagekey="i18n.password"></fmt:message>

</body>

</html>

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