spring中Aware 接口 感知捕获

Aware 接口 感知捕获

内容感知方式一：

package cn.mesmile.desk.config;

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.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.stereotype.Service;

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

/**
 * @author zb
 * @version 1.0
 * @date 2020/7/18 17:50
 * @description 内容感知
 *
 *  BeanNameAware         获取bean的名称
 *  BeanFactoryAware      获取BeanFactory
 *  ResourceLoaderAware   获取资源加载器
 *  EnvironmentAware      获取环境信息
 */
@Service
@PropertySource(value = "classpath:test.properties")
public class AwareService implements BeanNameAware, BeanFactoryAware,
        ResourceLoaderAware, EnvironmentAware {

    private String beanName;

    private ResourceLoader resourceLoader;

    private Environment environment;

    /**
     *  获取数据
     * @throws IOException
     */
    public void getValue() throws IOException {
        System.out.println("beanName: "+ beanName);
        
        Resource resource = resourceLoader.getResource("classpath:test.txt");
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(resource.getInputStream()));
        String s = bufferedReader.readLine();
        System.out.println("s: "+ s);
        bufferedReader.close();
        
        String property = environment.getProperty("my.address");
        System.out.println("property:  "+ property);
    }

    /**
     *
     * @param beanFactory
     * @throws BeansException
     */
    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {

    }

    @Override
    public void setBeanName(String s) {
        this.beanName = s;
    }

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

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

内容感知方式二：

package cn.mesmile.desk.config;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
import org.springframework.core.io.Resource;
import org.springframework.stereotype.Component;

/**
 * @author zb
 * @version 1.0
 * @date 2020/7/18 18:14
 * @description
 */
@PropertySource(value = "classpath:test.properties")
@Component
public class contextAware implements ApplicationContextAware {

    private ApplicationContext applicationContext;
    
    public void getValue(){
        // 判断 bean 是否存在
        boolean beanName = applicationContext.containsBean("beanName");
        
        Object beanName1 = applicationContext.getBean("beanName");
        
        AwareService bean = applicationContext.getBean(AwareService.class);
        
        AwareService awareService = applicationContext.getBean("awareService", AwareService.class);
        
        Environment environment = applicationContext.getEnvironment();
        String property = environment.getProperty("my.address");
        
        Resource resource = applicationContext.getResource("test.txt");
        String[] beanDefinitionNames = applicationContext.getBeanDefinitionNames();
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }
}

classpath下面的配置文件：

test.properties

my.address=测试

test.txt

这是一个测试文件