其實就是用aware來載入外部檔案,增加spring容器與bean的耦合度
javaboy.properties

javaboy.address=www.whereami.org

javaboy.txt

www.whereami.com

AwareService.java

package org.javaboy.aware;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.ResourceLoaderAware;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
import org.springframework.core.io.ResourceLoader;
import org.springframework.stereotype.Service;
import org.springframework.core.io.Resource;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * @author 鄧雪松 (づ￣ 3￣)づ)
 * @create 2021-10-25-21-36
 * 利用aware載入外部資源
 * BeanNameAware:獲得Bean的名稱,BeanFactoryAware:獲取當前的beanfactory,ResourceLoaderAware:獲取資源載入器,EnvironmentAwareree:獲取環境資訊
 */
@Service
@PropertySource(value="javaboy.properties")
public class AwareService implements BeanNameAware,BeanFactoryAware,ResourceLoaderAware,EnvironmentAware {
    private String beanName;
    private ResourceLoader resourceLoader;
    private Environment environment;

    public void output() throws IOException {
        System.out.println("beanName = "+beanName);
        Resource resource = resourceLoader.getResource("javaboy.txt");
        BufferedReader br = new BufferedReader(new InputStreamReader(resource.getInputStream()));
        String s = br.readLine();
        System.out.println("s = "+s);
        br.close();
        String address = environment.getProperty("javaboy.address");
        System.out.println("address = "+address);

    }

    //獲取bean的生成工廠
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {

    }
    //獲取Bean的名字
    public void setBeanName(String name) {
        this.beanName = name;
    }

    public void setEnvironment(Environment environment) {
        this.environment = environment;
    }

    public void setResourceLoader(ResourceLoader resourceLoader) {
        this.resourceLoader = resourceLoader;
    }
}
 

JavaConfig.java

package org.javaboy.aware;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

/**
 * @author 鄧雪松 (づ￣ 3￣)づ)
 * @create 2021-10-25-22-01
 */
@Configuration
@ComponentScan
public class JavaConfig {
}

Main.java

package org.javaboy.aware;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import java.io.IOException;

/**
 * @author 鄧雪松 (づ￣ 3￣)づ)
 * @create 2021-10-25-22-01
 */
public class Main {
    public static void main(String[] args) throws IOException {
        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(JavaConfig.class);
        AwareService bean = ctx.getBean(AwareService.class);
        bean.output();

    }
}