Java类中加载Spring中的ApplicationContext.xml文件的方式

<1>、利用ClassPathXmlApplicationContext,可以从classpath中读取XML文件
//读取一个文件
 1. ApplicationContext context= new ClassPathXmlApplicationContext("applicationContext.xml"); 
UserDAO userDAO= (UserDAO )context.getBean("userDAO"); 
//读取多个文件
 2.ClassPathXmlApplicationContext resource= new ClassPathXmlApplicationContext(new String[]
{"applicationContextconfig.xml","applicationContext.xml","applicationContext-data.xml"}); 
BeanFactory factory= resource;
UserDAO userDAO= (UserDAO ) factory.getBean("userDAO "); 
<2>、利用ClassPathResource,可以从classpath中读取XML文件
Resource resource= new ClassPathResource("applicationContext.xml"); 
BeanFactory bf=new XmlBeanFactory(resource ); 
UserDAO userDAO= (UserDAO )bf.getBean("userDAO "); 
<3>、利用XmlWebApplicationContext读取
XmlWebApplicationContext xmlctx = new XmlWebApplicationContext(); 
xmlctx.setConfigLocations(new String[] {"/WEB-INF/ applicationContext.xml"); 
xmlctx.setServletContext(pageContext.getServletContext()); 
xmlctx.refresh();
 UserDAO userDAO= (UserDAO ) xmlctx.getBean("userDAO "); 
<4>、利用FileSystemResource读取
 Resource resource= new FileSystemResource("E:/Java/spring/WebRoot/WEB-INF/classes/ applicationContext.xml"); 
BeanFactory factory= new XmlBeanFactory(resource );
 UserDAO userDAO= (UserDAO )factory.getBean("userDAO "); 
   注意:利用FileSystemResource，则配置文件必须放在project直接目录下，或者写明绝对路径，否则就会抛出找不到文件的异常
<5>、利用FileSystemXmlApplicationContext读取,可以指定XML定义文件的相对路径或者绝对路径来读取定义文件。
1.String[] path={"WebRoot/WEB-INF/applicationContext.xml","WebRoot/WEB-INF/applicationContext_config.xml"}; 
ApplicationContext context = new FileSystemXmlApplicationContext(path);
2. String path="WebRoot/WEB-INF/applicationContext*.xml"; 
ApplicationContext context = new FileSystemXmlApplicationContext(path); 
3.ApplicationContext ctx = new FileSystemXmlApplicationContext("classpath:地址");