** 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
1.1添加SpringMVC开发的相关jar包
commons-logging-1.1.3.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
1.2配置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_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>springmvc-1</display-name>
<!-- 配置DispatcherServlet -->
<servlet>
<servlet-name>DispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 配置DispacherServlet的一个初始化参数：配置SpringMVC配置文件的位置和名称 -->
<!-- 实际上不用通过contextConfigLocation来配置springMVC的配置文件，而是用默认的 -->
<!--
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>
</web-app>
1.3创建SpringMVC配置文件DispatcherServlet-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"
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 -->
<context:component-scan base-package="com.atguigu.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">
<property name="prefix" value="/WEB-INF/views/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
1.4创建请求处理器类
package com.atguigu.springmvc.handlers;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
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+returnValue+suffix）得到实际的物理视图，然后做转发操作
* /WEB-INF/views/success.jsp
*/
@RequestMapping("/helloworld")
public String hello()
{
System.out.println("hello world");
return "success";
}
}
1.5创建相应的视图
index.jsp
<body>
<a href="helloworld">Hello World</a>
</body>
success.jsp
<h4>success page</h4>
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