1.org.springframework.web.context.ContextLoaderListener的作用
使用spring除了添加必要的jar包,另外在web.xml一定要加上啟動(dòng)spring的監(jiān)聽(tīng)器,這樣配置在xml文件中的bean才會(huì)初始化
(1)ContextLoaderListener默認(rèn)加載位置是在WEB-INF/applicationContext.xml
(2)本例中將applicationContext.xml位置放到了classpath:META-INF/spring/applicationContext.xml下
(3)可以使用通配符classpath:META-INF/spring/applicationContext_*xml
(4)也可以添加多個(gè)xml配置文件,以“,”分割捡需，如下圖所示
(5)使用contextConfigLocation配置，ContextLoaderListener初始化的xml不需要顯示加載，初始化工作由ContextLoaderListener完成
2.使用applicationContext.xml中配置的bean
(1)新建Dog和Cat
(2)在applicationContext.xml中配置bean
(3)新建一個(gè)Sevlet锯岖，并在Servlet中使用
(4)測(cè)試帐萎，啟動(dòng)tomcat并部署應(yīng)用
http://localhost:8080/MissionToMars/HelloServlet
3.備注:spring加載xml的六種方法
(1)XmlBeanFactory 引用資源
Resource resource = new ClassPathResource("appcontext.xml");
BeanFactory factory = new XmlBeanFactory(resource);
(2)ClassPathXmlApplicationContext
ApplicationContext factory=new ClassPathXmlApplicationContext("classpath:appcontext.xml");
// src目錄下的
ApplicationContext factory=new ClassPathXmlApplicationContext("appcontext.xml");
ApplicationContext factory=new ClassPathXmlApplicationContext(new String[] {"bean1.xml","bean2.xml"});
// src/conf 目錄下的
ApplicationContext factory=new ClassPathXmlApplicationContext("conf/appcontext.xml");
ApplicationContext factory=new ClassPathXmlApplicationContext("file:G:/Test/src/appcontext.xml");
(3)用文件系統(tǒng)的路徑
ApplicationContext factory=new FileSystemXmlApplicationContext("src/appcontext.xml");
//使用了? classpath:? 前綴,作為標(biāo)志,? 這樣,FileSystemXmlApplicationContext 也能夠讀入classpath下的相對(duì)路徑
ApplicationContext factory=new FileSystemXmlApplicationContext("classpath:appcontext.xml");
ApplicationContext factory=new FileSystemXmlApplicationContext("file:G:/Test/src/appcontext.xml");
ApplicationContext factory=new FileSystemXmlApplicationContext("G:/Test/src/appcontext.xml");
(4)使用XmlWebApplicationContext
ServletContext servletContext = request.getSession().getServletContext();
ApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(servletContext );
(5)使用BeanFactory
BeanDefinitionRegistry reg = new DefaultListableBeanFactory();
XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(reg);
reader.loadBeanDefinitions(new ClassPathResource("bean1.xml"));
reader.loadBeanDefinitions(new ClassPathResource("bean2.xml"));
BeanFactory bf=(BeanFactory)reg;
(6)使用ContextLoaderListener
如本文開(kāi)始方式
