Spring中加载ApplicationContext.x…

1.利用ClassPathXmlApplicationContext

可以从classpath中读取XML文件
(1)
ApplicationContext context = newClassPathXmlApplicationContext("applicationContext.xml");

UserDao userDao = (UserDao)context.getBean("userDao");

(2)
ClassPathXmlApplicationContext resource = newClassPathXmlApplicationContext(

newString[]{"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 = newClassPathResource("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 = newXmlWebApplicationContext();

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 = newFileSystemResource("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 = newFileSystemXmlApplicationContext(path);

方法二：

String path="WebRoot/WEB-INF/applicationContext*.xml";

ApplicationContext context = newFileSystemXmlApplicationContext(path);

方法三：
ApplicationContext ctx = newFileSystemXmlApplicationContext("classpath:地址");
没有classpath的话就是从当前的工作目录