Spring中加载ApplicationContext.xml文件的方式

1.利用ClassPathXmlApplicationContext

可以从classpath中读取XML文件

(1)
ApplicationContext context [size=x-large]= 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");



加载一个xml文件org.springframework.beans.factory.config.PropertyPlaceholderConfigurer不起作用





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。
方法一：
String[] path={"WebRoot/WEB-INF/applicationContext.xml","WebRoot/WEB-INF/applicationContext_task.xml"}; ApplicationContext context = new FileSystemXmlApplicationContext(path);



方法二：

String path="WebRoot/WEB-INF/applicationContext*.xml"; ApplicationContext context = new FileSystemXmlApplicationContext(path);




方法三：
ApplicationContext ctx = new FileSystemXmlApplicationContext("classpath:地址");


没有classpath的话就是从当前的工作目录

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