spring boot: spring Aware的目的是为了让Bean获得Spring容器的服务

Spring Aware的目的是为了让Bean获得Spring容器的服务

 

//获取容器中的bean名称
import org.springframework.beans.factory.BeanNameAware;
//获得资源加载器，可以获得额外的资源
import org.springframework.context.ResourceLoaderAware;

 

package ch2.aware;
import java.io.IOException;

import org.apache.commons.io.IOUtils;
//获取容器中的bean名称
import org.springframework.beans.factory.BeanNameAware;
//获得资源加载器，可以获得额外的资源
import org.springframework.context.ResourceLoaderAware;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.stereotype.Service;

//AwareService是spring的一个组件
@Service
//实现BeanNameAware，ResourceLoaderAware资源的接口，获得名称和资源加载的服务
public class AwareService implements BeanNameAware,ResourceLoaderAware {
	
	
	private String beanName;
	private ResourceLoader loader;

	//实现ResourceLoaderAware需要重写setResourceLoader
	@Override
	public void setResourceLoader(ResourceLoader resourceLoader) {
		// TODO Auto-generated method stub
		this.loader = resourceLoader;
		
	}

	//实现BeanNameAware需要重写setBeanName
	@Override
	public void setBeanName(String name) {
		// TODO Auto-generated method stub
		this.beanName = name;		
	}
	
	public void outputResult()
	{
		System.out.println("bean的名字为："+ beanName);
		
		Resource resource = loader.getResource("classpath:ch2/aware/test.txt");
		
		try {
			System.out.println("ResourceLoader加载的内容为：" + IOUtils.toString(resource.getInputStream()));
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	

	
	
}

　配置：

package ch2.aware;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

//声明本类是一个配置类
@Configuration
//自动加载ch2.aware包下面的内容
@ComponentScan("ch2.aware")
public class AwareConfig {

}

　　运行：

package ch2.aware;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Main {

	public static void main(String[] args)
	{
		
		AnnotationConfigApplicationContext context= new AnnotationConfigApplicationContext(AwareConfig.class);
		AwareService awareService  = context.getBean(AwareService.class);
		awareService.outputResult();
		context.close();
	}
	
}