Spring中加载ApplicationContext.xml文件的方式

Spring中加载ApplicationContext.xml文件的方式

原文：http://blog.csdn.net/snowjlz/article/details/8158560

1、利用ClassPathXmlApplicationContext，可以从classpath中读取XML文件
(1)
    ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

    UserDao userDao = (UserDao)context.getBean("userDao");
(2)
    ClassPathXmlApplicationContext resource = new ClassPathXmlApplicationContext(new String[]{"applicationContext-ibatis-      oracle.xml","applicationContext.xml","applicationContext-data-oracle.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 cr = new ClassPathResource("applicationContext.xml"); BeanFactory bf=new XmlBeanFactory(cr);

    UserDao userDao = (UserDao)bf.getBean("userDao");
3．利用XmlWebApplicationContext读取
    XmlWebApplicationContext ctx = new XmlWebApplicationContext();

    ctx.setConfigLocations(new String[] {"/WEB-INF/ applicationContext.xml");

    ctx.setServletContext(pageContext.getServletContext());

    ctx.refresh();

    UserDao userDao = (UserDao ) ctx.getBean("userDao ");
4.利用FileSystemResource读取

    Resource rs = new FileSystemResource("D:/tomcat/webapps/test/WEB-INF/classes/ applicationContext.xml");

    BeanFactory factory = new XmlBeanFactory(rs);

    UserDao userDao = (UserDao )factory.getBean("userDao");
    值得注意的是：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_task.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");
    没有classpath的话就是从当前的工作目录