02SpringMvc_springmvc快速入门小案例（XML版本）

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：

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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。

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