spring aop实现事务 Spring源码解读之核心容器上节(3)

在spring 3.1之前只能在类级别上使用@profile注解，从spring 3.2之后，可以从方法级别上使用@profile注解，与@bean注解一起使用，上述放在两个不同配置类可以转化为两个方法放在同一个配置类中。

我先简要介绍一下 tns 远程劫持，tns 远程注入劫持只需要知道目标的 ip 地址、端口号和实例名，知道这三项后可通过欺骗的方法，把自己注册到 tns 上，以伪装成一个实例。

懒汉：故名思义，不到万不得已就不会去实例化类，也就是说在第一次用到类实例的时候才会去实例化，所以上边的经典方法被归为懒汉实现。

无论是客户端还是服务器端，程序的开发只需要一次，以后再要用到这些部分的时候，只需要通过voicexml文件去调用就可以了，这样系统功能的扩展和维护会变得更加快速和容易了。

ClassPathXmlApplicationContext源码

package org.springframework.context.support;

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;

public class ClassPathXmlApplicationContext extends AbstractXmlApplicationContext {

    @Nullable
    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, @Nullable 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, @Nullable ApplicationContext parent)
            throws BeansException {

        super(parent);
        setConfigLocations(configLocations);
        if (refresh) {
            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, @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];
        for (int i = 0; i < paths.length; i++) {
            this.configResources[i] = new ClassPathResource(paths[i], clazz);
        }
        refresh();
    }

    @Override
    @Nullable
    protected Resource[] getConfigResources() {
        return this.configResources;
    }
}

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