Spring源码学习--ClassPathXmlApplicationContext（一）

ApplicationContext应用上下文体系如下：

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;
  }

}