Spring 4.0 + Spring MVC（四）学习

1、在前面的二、三节的学习中分别提到了自动注入@Autowired和spring mvc的@Controller分发。在本节总，我将提高将两者结合起来使用。实例还是沿用第三节的Demo。

2、将web.xml中的内容新增如下：

<?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>SpringStudy</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:bean.xml</param-value>
</context-param>

<listener>
<description>spring监听器</description>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<servlet>
<servlet-name>SpringMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<description>spring MVC  配置文件</description>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>SpringMVC</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>

<session-config>
<session-timeout>15</session-timeout>
</session-config>

</web-app>

在web.xml文件中提到bean.xml和spring-mvc.xml的内容分别如下2.1和2.2中：

2.1、其中bean.xml中的内容为：

<?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" 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
">

<context:component-scan base-package="com.hl.demo" />
</beans>

2.2、其中spring-mvc.xml中的内容为：

<?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" 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
">
<!-- controller包(自动注入) -->
<context:component-scan base-package="com.hl.controller" />

</beans>

2.3、在2.1中bean.xml中提到的com.hl.demo包中有一个Chinese类，如下所示：

package com.hl.demo;

import org.springframework.stereotype.Service;

@Service("Chinese")
public class Chinese {

public void eat() {
System.out.println("eating");
}

public void walk() {
System.out.println("walking");
}

}

2.4、在2.2中spring-mvc.xml中提到的com.hl.controller包中有一个myController类，如下：

package com.hl.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.hl.demo.Chinese;

@Controller
@RequestMapping("/myController")
public class myController {

@Autowired
private Chinese chinese;

@RequestMapping("/showHelloWorld")
public String showHelloWorld(){
System.out.println("----showLogin----");
chinese.eat();
chinese.walk();
return "../index.jsp";
}

}

3、通过上面的配置便将@Autowired和@controller合并起来，换言之就是spring+spring mvc的最简单用法，而其他的用法都是在此基础上扩展开发来的。

4、启动tomcat后，运行 http://localhost:8080/SpringStudy/myController/showHelloWorld.do，便可将运行起来，得到的结果如下所示：

----showLogin----
eating
walking

5、在下一节中，我们将讲解为何这么配置。即去看分析源代码。

6、本实例的下载地址：http://download.csdn.net/detail/qq5132834/9178329