Spring在Web项目中的应用-添加ServletContext监听器

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添加ServletContext监听器

ServletContext初始化时创建Spring容器

获取容器

package com.hk.ssh.servlets;import java.io.IOException;import javax.servlet.ServletContext;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 com.hk.ssh.beans.Student;import com.hk.ssh.service.IStudentService;public class RegisterServlet extends HttpServlet {    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        request.setCharacterEncoding("utf-8");        String name = request.getParameter("name");        String ageStr = request.getParameter("age");        Integer age = Integer.valueOf(ageStr);        Student student = new Student(name,age);        //1、创建Spring 容器(这种创建方式每来一次请求就会创建一个ApplicationContext)        //ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");        /**         *  采用如下方式创建Spring容器，在ServletContext初始化是创建容器             *  ServletContext只初始化一次，所以整个web运用都只会有一个Spring容器         */        ServletContext application = request.getSession().getServletContext();        WebApplicationContext ac = (WebApplicationContext) application.getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);        //2、从容器中获取Service对象        IStudentService service = (IStudentService) ac.getBean("studentService");        //3、调用Service的addStudent()        service.addStudent(student);        request.getRequestDispatcher("/welcome.jsp").forward(request, response);    }}

获取Spring容器还有一个方法

WebApplicationContext ac =WebApplicationContextUtils.getRequiredWebApplicationContext(this.getServletContext());

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app version="3.0"    xmlns="http://java.sun.com/xml/ns/javaee"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">    <!-- 加载Spring配置文件        文件的位置和名称是可变的，且配置文件可以有多个     -->    <context-param>        <param-name>contextConfigLocation</param-name>        <param-value>classpath:applicationContext.xml</param-value>    </context-param>  <!-- 注册ServletContext监听器 -->  <listener>    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  </listener>  <servlet>    <servlet-name>Register-Servlet</servlet-name>    <servlet-class>com.hk.ssh.servlets.RegisterServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>Register-Servlet</servlet-name>    <url-pattern>/registerServlet</url-pattern>  </servlet-mapping></web-app>

完整项目源码：http://pan.baidu.com/s/1slEY7JR

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