在web开发中使用spring框架(基础)

在web开发中使用spring框架

按照之前学习，编写在servlet中使用spring

新建day02项目，导入spring核心开发jar包

业务层

package com.qst.service;
public class HelloService {
    public void sayHello(){
        System.out.println("我是一个快乐的Spring!");
    }
}

表现层(Web层) 从spring工厂获取对象

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 Applicationdisplay-name>
  <servlet>
    <servlet-name>HelloServletservlet-name>
    <servlet-class>com.qst.web.HelloServletservlet-class>
  servlet>
  <servlet-mapping>
    <servlet-name>HelloServletservlet-name>
    <url-pattern>/helloServleturl-pattern>
  servlet-mapping>
web-app>

HelloServlet.java

public class HelloServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
        HelloService helloService = ac.getBean("helloService", HelloService.class);
        helloService.sayHello();
    }
}

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/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="helloService" class="com.qst.service.HelloService">bean>
beans>

测试:

http://localhost:9898/helloServlet