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

1. <1>、利用ClassPathXmlApplicationContext,可以从classpath中读取XML文件  
2. //读取一个文件  
3.  1. ApplicationContext context= new ClassPathXmlApplicationContext("applicationContext.xml");   
4. UserDAO userDAO= (UserDAO )context.getBean("userDAO");   
5. //读取多个文件  
6.  2.ClassPathXmlApplicationContext resource= new ClassPathXmlApplicationContext(new String[]  
7. {"applicationContextconfig.xml","applicationContext.xml","applicationContext-data.xml"});   
8. BeanFactory factory= resource;  
9. UserDAO userDAO= (UserDAO ) factory.getBean("userDAO ");  
10.  
11. <2>、利用ClassPathResource,可以从classpath中读取XML文件  
12. Resource resource= new ClassPathResource("applicationContext.xml");   
13. BeanFactory bf=new XmlBeanFactory(resource );   
14. UserDAO userDAO= (UserDAO )bf.getBean("userDAO ");   
15. 
    
16. <3>、利用XmlWebApplicationContext读取  
17. XmlWebApplicationContext xmlctx = new XmlWebApplicationContext();   
18. xmlctx.setConfigLocations(new String[] {"/WEB-INF/ applicationContext.xml");   
19. xmlctx.setServletContext(pageContext.getServletContext());   
20. xmlctx.refresh();  
21.  UserDAO userDAO= (UserDAO ) xmlctx.getBean("userDAO ");   
22. 
    
23. <4>、利用FileSystemResource读取  
24.  Resource resource= new FileSystemResource("E:/Java/spring/WebRoot/WEB-INF/classes/ applicationContext.xml");   
25. BeanFactory factory= new XmlBeanFactory(resource );  
26.  UserDAO userDAO= (UserDAO )factory.getBean("userDAO ");   
27.    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  
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29. <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。  
30. 1.String[] path={"WebRoot/WEB-INF/applicationContext.xml","WebRoot/WEB-INF/applicationContext_config.xml"};   
31. ApplicationContext context = new FileSystemXmlApplicationContext(path);  
32. 2. String path="WebRoot/WEB-INF/applicationContext*.xml";   
33. ApplicationContext context = new FileSystemXmlApplicationContext(path);   
34. 3.ApplicationContext ctx = new FileSystemXmlApplicationContext("classpath:地址");