Spring MVC学习（一）

新建一个web project项目，项目名字为springMvc

导包

Controller类的实现

HelloMvc类实现了Controller接口

package cn.controller;

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 HelloMvc implements Controller{

	@Override
	public ModelAndView handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception {
		ModelAndView mv=new ModelAndView();
		mv.setViewName("Index");
		mv.addObject("message", "Hello MVC!!!");
		return mv;
	}

}

注意一下，如果你的类名为Controller,实现Controller接口的时候是这样的

增加Spring支持

项目-右键（我的是myeclipse2016的）

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myeclipse低一点的版本

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创建资源文件夹

右键资源文件夹-other

改一下名字，我改为applicationContext-mvc（随便都行）

选上mvc和context

代码：

<?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-4.2.xsd
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd">
	
	
	<bean class="cn.controller.HelloMvc" name="/chy.html"></bean>

	<!-- 组件扫描 -->
	<context:component-scan base-package="cn.controller"></context:component-scan>

	<!-- 视图解析器 -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<!-- /WEB-INF/jsp/index.jsp -->
		<property name="prefix" value="/WEB-INF/jsp/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
	
</beans>

新建一个文件夹，用来放jsp页面（框里面两个我也不知道什么东西）

里面内容改为

修改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_3_0.xsd" 
		version="3.0">
  <display-name>springMvc</display-name>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  
  <servlet>
  		<servlet-name>SV</servlet-name>
  		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  		<init-param>
  			<param-name>contextConfigLocation</param-name>
  			<param-value>classpath:applicationContext-mvc.xml</param-value>
  		</init-param>
  		<load-on-startup>1</load-on-startup>
  </servlet>
  
  <servlet-mapping>
     <servlet-name>SV</servlet-name>
     <url-pattern>/</url-pattern>
  </servlet-mapping>
  
</web-app>

运行后出现

严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from ServletContext resource [/WEB-INF/applicationContext.xml]; nested exception is java.io.FileNotFoundException: Could not open ServletContext resource [/WEB-INF/applicationContext.xml]
...

Caused by: java.io.FileNotFoundException: Could not open ServletContext resource [/WEB-INF/applicationContext.xml]
...

严重: Exception sending context destroyed event to listener instance of class org.springframework.web.context.ContextLoaderListener
java.lang.IllegalStateException: BeanFactory not initialized or already closed - call 'refresh' before accessing beans via the ApplicationContext

我把这段注释掉了就行了，web.xml里面的（我也不知道什么原因）

运行结果

Spring MVC学习（一）

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