整合Spring开发环境只需要引入spring-web-3.2.0.RELEASE.jar这个jar包就可以了,因为它已经帮我们做好了.
Spring整合web开发,不用每次都加载Spring环境了。
package cn.itcast.service;public class UserService {public void sayHello(){System.out.println("Hello Spring web....."); } }
package cn.itcast.servlet;import java.io.IOException; import java.io.PrintWriter;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;/*import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext;*/ import org.springframework.web.context.WebApplicationContext; import org.springframework.web.context.support.WebApplicationContextUtils; import cn.itcast.service.UserService;@SuppressWarnings("serial") public class UserServlet extends HttpServlet { //每次启动Servlet都会加载Spring的环境.每次运行都需要加载Spring的环境.Spring配置环境中的东西如果多了,每次加载Servlet就加载Spring环境肯定不行.public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {/* ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");UserService userService = (UserService) applicationContext.getBean("userService");userService.sayHello();*///得把代码改了,否则每次都是来获取Spring的环境.WebApplicationContext applicationContext = WebApplicationContextUtils.getWebApplicationContext(getServletContext());//工具类WebApplicationContextUtilsUserService userService = (UserService) applicationContext.getBean("userService");userService.sayHello();}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request,response);}}
<?xml version="1.0" encoding="UTF-8"?> <!-- 别去schema,schema是文件,本地的文件,你得引那个头 --><beans xmlns="http://www.springframework.org/schema/beans"xmlns:p="http://www.springframework.org/schema/p"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"><bean id="userService" class="cn.itcast.service.UserService"></bean> </beans>
<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"><display-name></display-name><!-- 配置监听器ContextLoaderListener --><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><!-- 配置全局初始化参数 --><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:applicationContext.xml</param-value></context-param><servlet><description>This is the description of my J2EE component</description><display-name>This is the display name of my J2EE component</display-name><servlet-name>UserServlet</servlet-name><servlet-class>cn.itcast.servlet.UserServlet</servlet-class></servlet><servlet-mapping><servlet-name>UserServlet</servlet-name><url-pattern>/userServlet</url-pattern></servlet-mapping><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list> </web-app>
