Spring之配置文件加载方式

Spring在org.springframework.core.io包中提供了多种配置文件加载方式。无论是XML、URL还是文件，都有很好的支持。比如基于URL的UrlResource、基于输入流的InputStreamResource、基于文件系统的FileSystemResource、基于应用classpath的ClassPathResource。开发者可以从不同位置、以不同方式加载Spring配置文件。

常用的集中配置文件加载方式：

一:XmlBeanFactory 加载方式。此方式常用于应用程序，如swt、applet等。

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//基于资源文件加载：
Resource resource = new ClassPathResource("appcontext.xml");

BeanFactory factory = new XmlBeanFactory(resource);

//基于流文件加载：
InputStream in = new FileInputStream("appcontext.xml");

BeanFactory factory = new XmlBeanFactory(in);

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ApplicationContext context=new classPathXmlApplicationContext("classpath:appcontext.xml");

BeanFactory factory = (BeanFactory)context;

// src目录下的
ApplicationContext context=new ClassPathXmlApplicationContext("appcontext.xml");

BeanFactory factory = (BeanFactory)context;

// src/conf 目录下的
ApplicationContext context=new ClassPathXmlApplicationContext("conf/appcontext.xml");

BeanFactory factory = (BeanFactory)context;
//绝对路径
ApplicationContext context=new ClassPathXmlApplicationContext("file:G:/Test/src/appcontext.xml");

BeanFactory factory = (BeanFactory)context;

ApplicationContext context=new classPathXmlApplicationContext("classpath:appcontext.xml");
BeanFactory factory = (BeanFactory)context;

// src目录下的
ApplicationContext context=new ClassPathXmlApplicationContext("appcontext.xml");
BeanFactory factory = (BeanFactory)context;

// src/conf 目录下的
ApplicationContext context=new ClassPathXmlApplicationContext("conf/appcontext.xml");
BeanFactory factory = (BeanFactory)context;
//绝对路径
ApplicationContext context=new ClassPathXmlApplicationContext("file:G:/Test/src/appcontext.xml");
BeanFactory factory = (BeanFactory)context;

三 : 文件系统的加载方式

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ApplicationContext factory=new FileSystemXmlApplicationContext("src/appcontext.xml");

//使用了 classpath: 前缀,作为标志, 这样,FileSystemXmlApplicationContext 也能够读入classpath下的相对路径

ApplicationContext factory=new FileSystemXmlApplicationContext("classpath:appcontext.xml");

ApplicationContext factory=new FileSystemXmlApplicationContext("file:G:/Test/src/appcontext.xml");

ApplicationContext factory=new FileSystemXmlApplicationContext("G:/Test/src/appcontext.xml");

ApplicationContext factory=new FileSystemXmlApplicationContext("src/appcontext.xml");
//使用了 classpath: 前缀,作为标志, 这样,FileSystemXmlApplicationContext 也能够读入classpath下的相对路径
ApplicationContext factory=new FileSystemXmlApplicationContext("classpath:appcontext.xml");
ApplicationContext factory=new FileSystemXmlApplicationContext("file:G:/Test/src/appcontext.xml");
ApplicationContext factory=new FileSystemXmlApplicationContext("G:/Test/src/appcontext.xml");

四: XmlWebApplicationContext 是专为Web工程定制的。

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ServletContext servletContext = request.getSession().getServletContext();

ApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(servletContext );