ClassPathXmlApplicationContext源码分析 _application

胸怀万里世界，放眼无限未来。这篇文章主要讲述ClassPathXmlApplicationContext源码分析相关的知识，希望能为你提供帮助。
ClassPathXmlApplicationContext源码解读入口函数
通过ClassPathXmlApplicationContext类构造方法启动父类AbstractApplicationContext的函数refresh方法
ClassPathXmlApplicationContext源码：

package org.springframework.context.support;
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import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
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public class ClassPathXmlApplicationContext extends AbstractXmlApplicationContext {
@Nullable
private Resource[] configResources;
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public ClassPathXmlApplicationContext() {
}
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public ClassPathXmlApplicationContext(ApplicationContext parent) {
super(parent);
}
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public ClassPathXmlApplicationContext(String configLocation) throws BeansException {
this(new String[]{configLocation}, true, (ApplicationContext)null);
}
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public ClassPathXmlApplicationContext(String... configLocations) throws BeansException {
this(configLocations, true, (ApplicationContext)null);
}
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public ClassPathXmlApplicationContext(String[] configLocations, @Nullable ApplicationContext parent) throws BeansException {
this(configLocations, true, parent);
}
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public ClassPathXmlApplicationContext(String[] configLocations, boolean refresh) throws BeansException {
this(configLocations, refresh, (ApplicationContext)null);
}
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public ClassPathXmlApplicationContext(String[] configLocations, boolean refresh, @Nullable ApplicationContext parent) throws BeansException {
super(parent);
this.setConfigLocations(configLocations);
if (refresh) {
this.refresh();
}
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}
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public ClassPathXmlApplicationContext(String path, Class< ?> clazz) throws BeansException {
this(new String[]{path}, clazz);
}
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public ClassPathXmlApplicationContext(String[] paths, Class< ?> clazz) throws BeansException {
this(paths, clazz, (ApplicationContext)null);
}
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public ClassPathXmlApplicationContext(String[] paths, Class< ?> clazz, @Nullable 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];
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for(int i = 0; i < paths.length; ++i) {
this.configResources[i] = new ClassPathResource(paths[i], clazz);
}
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this.refresh();
}
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@Nullable
protected Resource[] getConfigResources() {
return this.configResources;
}
}
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ClassPathXmlApplicationContext(String configLocation) 一般使用这个方法，传入一个string类型的xml文件名，通过xml配置文件指定特定的组件，实例化到bean工厂里，即DefaultSingletonBeanRegistry 下的Map集合里
【ClassPathXmlApplicationContext源码分析】ClassPathXmlApplicationContext(String... configLocations)：可传入多个xml，装配到spring，bean工厂
public ClassPathXmlApplicationContext(String[] configLocations, boolean refresh) :传入String数组

@Test
public void TestXmlBean(){
ClassPathXmlApplicationContext context =new ClassPathXmlApplicationContext("classpath:xmlRegBean.xml");
Animal cat =context.getBean("cat", Cat.class);
cat.getName();
}
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@Test
public void TestMultiXml(){
ClassPathXmlApplicationContext context =new ClassPathXmlApplicationContext("classpath:xmlRegBean.xml","classpath:xmlRegBean2.xml");
Animal cat =context.getBean("cat", Cat.class);
cat.getName();
System.out.println(cat);
Animal cat2 =context.getBean("cat2", Cat.class);
cat2.getName();
System.out.println(cat2);
}

@Test
public void TestArrayXml(){
String[] arrXml = {"classpath:xmlRegBean.xml","classpath:xmlRegBean2.xml"};
ClassPathXmlApplicationContext context =new ClassPathXmlApplicationContext(arrXml,true);
Animal cat =context.getBean("cat", Cat.class);
cat.getName();
System.out.println(cat);
Animal cat2 =context.getBean("cat2", Cat.class);
cat2.getName();
System.out.println(cat2);
}