12.1 Aware
- 我们设计的准则是解耦,这就意味着我们不能对Spring的IoC容器有直接的依赖,但是我们还是想我们的bean能识别容器的资源;
- 使用aware能让我们在应用的任意位置获得spring容器的资源;
- 我们通过实现aware接口来识别spring容器的资源;
- Spring包含的aware有:
- BeanNameAware
- BeanFactoryAware
- ApplicationContextAware
- MessageSourceAware
- ApplicationEventPublisherAware
- ResourceLoaderAware
- 实现ApplicationContextAware接口,可识别所有的资源,但最好是你用到什么就使用什么;
- 这也就意味着我们就耦合到了spring框架上了,没有spring框架你的代码将无法执行;
12.2 示例
12.2.1 新建演示bean
package com.wisely.aware;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.context.ResourceLoaderAware;
import org.springframework.core.io.ResourceLoader;
import org.springframework.stereotype.Component;
@Component
public class DemoBean implements BeanNameAware,ResourceLoaderAware{
private String name;
private ResourceLoader loader;
//BeanNameAware接口的方法
public void setBeanName(String beanName) {
this.name = beanName;
}
//ResourceLoaderAware接口的的方法
public void setResourceLoader(ResourceLoader resourceLoader) {
this.loader = resourceLoader;
}
public String getName() {
return name;
}
public ResourceLoader getLoader() {
return loader;
}
}
12.2.2 新建演示用文件info.txt
jhkljhlkjhlkj
111111111111
12.2.3 测试
package com.wisely.aware;
import java.io.IOException;
import org.apache.commons.io.IOUtils;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
public class Main {
public static void main(String[] args) throws IOException {
AnnotationConfigApplicationContext context =
new AnnotationConfigApplicationContext("com.wisely.aware");
DemoBean db = context.getBean(DemoBean.class);
System.out.println(db.getName());
ResourceLoader rl = db.getLoader();
Resource r = rl.getResource("classpath:com/wisely/aware/info.txt");
System.out.println(IOUtils.toString(r.getInputStream()));
context.close();
}
}
输出结果
demoBean
jhkljhlkjhlkj
111111111111