Spring源码学习--ClassPathXmlApplicationContext（一）

╰+哭是因爲堅強的太久メ 2022-07-12 19:49 209阅读 0赞

ApplicationContext应用上下文体系如下：

![Image 1][]

在实现类ClassPathXmlApplicationContext中其实并没有多少重要的操作，主要是在构造函数中配置Spring配置文件的路径：

public class DaoOperationMain {
    	
    	public static void main(String[] args) {
    		
    		ApplicationContext appCtx = new ClassPathXmlApplicationContext("applicationContext.xml");
    		
    	}
    }

具体的applicationContext.xml解析相关的操作都在父类refresh中进行操作。

ClassPathXmlApplicationContext的源码如下：

/**
     * 并没有太多具体的操作，主要是初始化构造函数，主要的操作都在父类中
     */
    public class ClassPathXmlApplicationContext extends AbstractXmlApplicationContext {
    
    	private Resource[] configResources;
    
    	public ClassPathXmlApplicationContext() {
    	}
    	public ClassPathXmlApplicationContext(ApplicationContext parent) {
    		super(parent);
    	}
    	public ClassPathXmlApplicationContext(String configLocation) throws BeansException {
    		this(new String[] {configLocation}, true, null);
    	}
    	public ClassPathXmlApplicationContext(String... configLocations) throws BeansException {
    		this(configLocations, true, null);
    	}
    	public ClassPathXmlApplicationContext(String[] configLocations, ApplicationContext parent) throws BeansException {
    		this(configLocations, true, parent);
    	}
    	public ClassPathXmlApplicationContext(String[] configLocations, boolean refresh) throws BeansException {
    		this(configLocations, refresh, null);
    	}
    	public ClassPathXmlApplicationContext(String[] configLocations, boolean refresh, ApplicationContext parent)
    			throws BeansException {
    
    		super(parent);
    		//设置spring的配置文件
    		setConfigLocations(configLocations);
    		if (refresh) {
    			//调用父类的refresh函数，进行一系列初始化
    			refresh();
    		}
    	}
    
    
    	
    	public ClassPathXmlApplicationContext(String path, Class<?> clazz) throws BeansException {
    		this(new String[] {path}, clazz);
    	}
    
    
    	public ClassPathXmlApplicationContext(String[] paths, Class<?> clazz) throws BeansException {
    		this(paths, clazz, null);
    	}
    
    	
    	public ClassPathXmlApplicationContext(String[] paths, Class<?> clazz, ApplicationContext parent)
    			throws BeansException {
    
    		super(parent);
    		Assert.notNull(paths, "Path array must not be null");
    		Assert.notNull(clazz, "Class argument must not be null");
    		this.configResources = new Resource[paths.length];
    		for (int i = 0; i < paths.length; i++) {
    			this.configResources[i] = new ClassPathResource(paths[i], clazz);
    		}
    		//调用父类的refresh函数，进行一系列初始化
    		refresh();
    	}
    
    
    	@Override
    	protected Resource[] getConfigResources() {
    		return this.configResources;
    	}
    
    }

[Image 1]: