一、簡(jiǎn)單的用ApplicationContext做測(cè)試的話(huà),獲得Spring中定義的Bean實(shí)例(對(duì)象).可以用:
ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
RegisterDAO registerDAO = (RegisterDAO)ac.getBean("RegisterDAO");
如果是兩個(gè)以上:
ApplicationContext ac = new ClassPathXmlApplicationContext(new String[]{"applicationContext.xml","dao.xml"});
或者用通配符:
ApplicationContext ac = new ClassPathXmlApplicationContext("classpath:/*.xml");
二、ClassPathXmlApplicationContext[只能讀放在web-info/classes目錄下的配置文件]和FileSystemXmlApplicationContext的區(qū)別
classpath:前綴是不需要的,默認(rèn)就是指項(xiàng)目的classpath路徑下面;
如果要使用絕對(duì)路徑,需要加上file:前綴表示這是絕對(duì)路徑;
對(duì)于FileSystemXmlApplicationContext:
默認(rèn)表示的是兩種:
1.沒(méi)有盤(pán)符的是項(xiàng)目工作路徑,即項(xiàng)目的根目錄;
2.有盤(pán)符表示的是文件絕對(duì)路徑.
如果要使用classpath路徑,需要前綴classpath:
public class HelloClient {
protected static final Log log = LogFactory.getLog(HelloClient.class);
public static void main(String[] args) {
// Resource resource = new ClassPathResource("appcontext.xml");
// BeanFactory factory = new XmlBeanFactory(resource);
// 用classpath路徑
// ApplicationContext factory = new ClassPathXmlApplicationContext("classpath:appcontext.xml");
// ApplicationContext factory = new ClassPathXmlApplicationContext("appcontext.xml");
// ClassPathXmlApplicationContext使用了file前綴是可以使用絕對(duì)路徑的
// ApplicationContext factory = new ClassPathXmlApplicationContext("file:F:/workspace/example/src/appcontext.xml");
// 用文件系統(tǒng)的路徑,默認(rèn)指項(xiàng)目的根路徑
// ApplicationContext factory = new FileSystemXmlApplicationContext("src/appcontext.xml");
// ApplicationContext factory = new FileSystemXmlApplicationContext("webRoot/WEB-INF/appcontext.xml");
// 使用了classpath:前綴,這樣,FileSystemXmlApplicationContext也能夠讀取classpath下的相對(duì)路徑
// ApplicationContext factory = new FileSystemXmlApplicationContext("classpath:appcontext.xml");
// ApplicationContext factory = new FileSystemXmlApplicationContext("file:F:/workspace/example/src/appcontext.xml");
// 不加file前綴
ApplicationContext factory = new FileSystemXmlApplicationContext("F:/workspace/example/src/appcontext.xml");
IHelloWorld hw = (IHelloWorld)factory.getBean("helloworldbean");
log.info(hw.getContent("luoshifei"));
}
}