这篇文章中，我们要写一个入门案例，去整体了解整个SpringMVC。
先给出整个项目的结构图：
aaarticlea/png;base64,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" alt="" />
第一步：创建springmvc-day01这么一个web应用
第二步：导入springioc，springweb , springmvc相关的jar包
第三步：在/WEB-INF/下创建web.xml文件
<?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_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>SpringMvc_10day_self</display-name>
<servlet>
<!--这个名字可以随便取得，但是这个名字取了之后，以后在 WEB-INF下面创建SpirngMVC的配置文件是，命名必须以这个开头， 所以这里取名叫做DispatcherServlet，那么之后的xml文件取名必须为DispatcherServlet-servlet.xml（一个字都不能差） -->
<servlet-name>DispatcherServlet</servlet-name>
<servlet-class> org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>DispatcherServlet</servlet-name>
<url-pattern>*.action</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list>
</web-app>
第四步：创建HelloAction控制器类：
/**
* Create by 沈晓权
* Create on 2016年8月6日下午2:01:49
*/
package com.guigu.shen.Action; import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller; public class HelloAction implements Controller { @Override
public ModelAndView handleRequest(HttpServletRequest arg0,
HttpServletResponse arg1) throws Exception {
ModelAndView modelAndView=new ModelAndView();
modelAndView.addObject("message","这是我得第一个"
+ "SpringMvc应用程序");
modelAndView.setViewName("/jsp/success.jsp");
return modelAndView; } }
第五步：在/WebRoot/下创建jsp/success.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head> <body>
Success. <br>
${message}
</body>
</html>
第六步：在/WEB-INF/创建DispatcherServlet-servlet.xml配置文件，xml头部信息与spring.xml相同
注意：该配置文件的命名规则：web.xml文件中配置的<servlet-name>的值-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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation=" http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"
>
<!-- 控制器(程序员) -->
<bean name="/hello.action" class="com.guigu.shen.Action.HelloAction"></bean> <!-- 映射器(框架)
BeanNameUrlhanderMapping的作用是将上面那个bean标签的name属性当做URL请求，
这个映射器配不配都可以，就算不配，系统也会自己去创建的
-->
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean> <!-- 适配器(框架)
SimpleControllerHandlerAdapter的作用是查找实现了Colltroler接口的Action类
这个适配器配不配都可以，就算不配，系统也会自己去创建的
-->
<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean> <!-- 视图解析器(框架)
InternalResourceViewResolver的作用是通过ModelAndView对象中封装的视图名找到真正的jsp页面路径。比如说
modelAndView.setViewName("/jsp/success.jsp")这里只是封装了一个"/jsp/success.jsp"这么一个字符串，就由InternalResourceViewResolver
去把他解析成真正的路径。
这个适配器配不配都可以，就算不配，系统也会自己去创建。
--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"></bean>
</beans>
最后一步：
在地址栏输入：http://127.0.0.1:8080/SpringMvc_10day_self/hello.action
运行结果如下：
aaarticlea/png;base64,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" alt="" />
以上就是一个入门小案例。
思考一些问题：SpringMVC创建的Action是单例模式呢还是什么？
验证一下：
修改代码如下：
/**
* Create by 沈晓权
* Create on 2016年8月6日下午2:01:49
*/
package com.guigu.shen.Action; import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller; /*
* Create by 沈晓权
* Create on 2016年8月6日下午2:01:49
*/
public class HelloAction implements Controller {
/**
*
*/
public HelloAction() { System.out.print("创建了一个Action");
}
@Override
public ModelAndView handleRequest(HttpServletRequest arg0,
HttpServletResponse arg1) throws Exception {
System.out.println("this is HelloAction handleRequest");
ModelAndView modelAndView=new ModelAndView();
modelAndView.addObject("message","这是我得第一个"
+ "SpringMvc应用程序");
modelAndView.setViewName("/jsp/success.jsp");
return modelAndView; } }
运行结果为：
创建了一个Action 2016-8-6 15:25:22 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
信息: FrameworkServlet 'DispatcherServlet': initialization completed in 523 ms
this is HelloAction handleRequest
this is HelloAction handleRequest
this is HelloAction handleRequest
运行结果表明这就是一个单例模式。
构造器只会走一次，就是只创建一个对象，但是public ModelAndView handleRequest(HttpServletRequest arg0,HttpServletResponse arg1)这个方法就会执行n多次。