一、簡單的用ApplicationContext做測試的話,獲得Spring中定義的Bean例項(物件).可以用:

ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
RegisterDAO registerDAO = (RegisterDAO)ac.getBean("RegisterDAO");

如果是兩個

ApplicationContext ac = new ClassPathXmlApplicationContext(new String[]{"applicationContext.xml"
 
,"dao.xml"});

萬用字元:

ApplicationContext ac = new ClassPathXmlApplicationContext("classpath:/*.xml");

二、ClassPathXmlApplicationContext[只能讀放在web-info/classes目錄下的配置檔案]和FileSystemXmlApplicationContext的區別

classpath:字首是不需要的,預設就是指專案的classpath路徑下面;
如果要使用絕對路徑,需要加上file:字首表示這是絕對路徑;

對於FileSystemXmlApplicationContext:
預設表示的是兩種:

1.沒有碟符的是專案工作路徑,即專案的根目錄;
2.有碟符表示的是檔案絕對路徑.

如果要使用classpath路徑,需要字首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字首是可以使用絕對路徑的
    // ApplicationContext factory = new ClassPathXmlApplicationContext("file:F:/workspace/example/src/appcontext.xml");

    // 用檔案系統的路徑,預設指專案的根路徑
    // ApplicationContext factory = new FileSystemXmlApplicationContext("src/appcontext.xml");
    // ApplicationContext factory = new FileSystemXmlApplicationContext("webRoot/WEB-INF/appcontext.xml");


    // 使用了classpath:字首,這樣,FileSystemXmlApplicationContext也能夠讀取classpath下的相對路徑
    // ApplicationContext factory = new FileSystemXmlApplicationContext("classpath:appcontext.xml");
    // ApplicationContext factory = new FileSystemXmlApplicationContext("file:F:/workspace/example/src/appcontext.xml");

    // 不加file字首
    ApplicationContext factory = new FileSystemXmlApplicationContext("F:/workspace/example/src/appcontext.xml");
    IHelloWorld hw = (IHelloWorld)factory.getBean("helloworldbean");
    log.info(hw.getContent("luoshifei"));
  }
}