在javaSE中使用Spring載入ApplicationContext.xml檔案的方式
1.利用ClassPathXmlApplicationContext
可以從classpath中讀取XML檔案
(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
可以從classpath中讀取XML檔案
Resource cr = new ClassPathResource("applicationContext.xml"); BeanFactory bf=new XmlBeanFactory(cr); UserDao userDao = (UserDao)bf.getBean("userDao");載入一個xml檔案org.springframework.beans.factory.config.PropertyPlaceholderConfigurer不起作用
3.利用XmlWebApplicationContext讀取
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.
值得注意的是:利用FileSystemResource,則配置檔案必須放在project直接目錄下,或者寫明絕對路徑,否則就會丟擲找不到檔案的異常
5.利用FileSystemXmlApplicationContext讀取
可以指定XML定義檔案的相對路徑或者絕對路徑來讀取定義檔案。
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");
沒有classpath的話就是從當前的工作目錄
最後一種:
1.建立一個類並讓其實現org.springframework.context.ApplicationContextAware介面來讓Spring在啟動的時候為我們注入ApplicationContext物件.
示例程式碼:
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
public class MyApplicationContextUtil implements ApplicationContextAware {
private static ApplicationContext context;
//宣告一個靜態變數儲存
public void setApplicationContext(ApplicationContext contex) throws BeansException {
this.context=contex;
}
public static ApplicationContext getContext(){
return context;
}
}
2.在applicationContext.xml檔案中配置此bean,以便讓Spring啟動時自動為我們注入ApplicationContext物件.
例:
<!-- 這個bean主要是為了得到ApplicationContext 所以它不需要其它屬性-->
<bean class="org.ing.springutil.MyApplicationContextUtil"></bean>
3.有了這個ApplicationContext之後我們就可以呼叫其getBean("beanName")方法來得到由Spring 管理所有物件.