Java類中加載Spring中的ApplicationContext.xml文件的方式

Xml代碼  

<1>、利用ClassPathXmlApplicationContext,可以從classpath中讀取XML文件
//讀取一個文件
 1. ApplicationContext context= new ClassPathXmlApplicationContext("applicationContext.xml");
UserDAO userDAO= (UserDAO )context.getBean("userDAO");
//讀取多個文件
 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,可以從classpath中讀取XML文件
Resource resource= new ClassPathResource("applicationContext.xml");
BeanFactory bf=new XmlBeanFactory(resource );
UserDAO userDAO= (UserDAO )bf.getBean("userDAO ");

<3>、利用XmlWebApplicationContext讀取
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讀取
 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，則配置文件必須放在project直接目錄下，或者寫明絕對路徑，否則就會拋出找不到文件的異常

<5>、利用FileSystemXmlApplicationContext讀取,可以指定XML定義文件的相對路徑或者絕對路徑來讀取定義文件。
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");