引用jar包

• spring-context
• spring-beans
• spring-core
• spring-web
• spring-aop
• javax.servlet-api
• commons-logging

pom.xml

項(xiàng)目結(jié)構(gòu)

代碼

• HelloService.java

  package service;/*** Created by handsome programmer.* User: chen* Date: 2018/1/21* Time: 17:38* Description:*/public class HelloService {public String getUsername(String str) {return "Hello " + str;}}

• HelloSpring.java

  package servlet;import org.springframework.web.context.WebApplicationContext; import org.springframework.web.context.support.WebApplicationContextUtils; import service.HelloService;import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException;/*** Created by handsome programmer.* User: chen* Date: 2018/1/21* Time: 17:24* Description:*/ @WebServlet(name = "hello", urlPatterns = "/hello") public class HelloSpring extends HttpServlet {private HelloService helloService;@Overrideprotected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding("UTF-8");String message = request.getParameter("username");//獲取Spring容器WebApplicationContext applicationContext = WebApplicationContextUtils.getWebApplicationContext(this.getServletContext());System.out.println("applicationContext = " + applicationContext);helloService = applicationContext.getBean("helloService", HelloService.class);System.out.println("message = " + message);message = helloService.getUsername(message);request.setAttribute("message", message);request.getRequestDispatcher("index.jsp").forward(request, response);} }

• applicationContext.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"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd"><bean id="helloService" class="service.HelloService"/> </beans>

• web.xml

  <!DOCTYPE web-app PUBLIC"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN""http://java.sun.com/dtd/web-app_2_3.dtd" ><web-app><display-name>Archetype Created Web Application</display-name><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:applicationContext.xml</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener> </web-app>

• index.jsp

• 訪問鏈接：http://localhost:8080/hello?username=admin
• 訪問效果

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