自定义PropertySource 解析

添加依赖

由于是要读取yaml文件，需要添加yaml的依赖

<dependency>
    <groupId>org.yaml</groupId>
    <artifactId>snakeyaml</artifactId>
    <version>1.26</version>
</dependency>

YamlPropertySourceFactory

package com.edu.spring5;
import org.springframework.beans.factory.config.YamlPropertiesFactoryBean;
import org.springframework.core.env.PropertiesPropertySource;
import org.springframework.core.env.PropertySource;
import org.springframework.core.io.support.EncodedResource;
import org.springframework.core.io.support.PropertySourceFactory;

import java.io.IOException;
import java.util.Properties;
public class YamlPropertySourceFactory implements PropertySourceFactory {

    @Override
    public PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException {
        YamlPropertiesFactoryBean yamlPropertiesFactoryBean = new YamlPropertiesFactoryBean();
        yamlPropertiesFactoryBean.setResources(resource.getResource());
        Properties properties = yamlPropertiesFactoryBean.getObject();
        return name != null ? new PropertiesPropertySource(name, properties) : new PropertiesPropertySource(resource.getResource().getFilename(), properties);
    }
}

在Spring4.3 之前要使用PropertySource,因为DefaultPropertySourceFactory,要注入PropertySourcePlaceHolderConfigurer 这个类

@Bean
public PropertySourcesPlaceholderConfigurer propertySourceConfigurer(){
    return new PropertySourcesPlaceholderConfigurer();
}

参考文献

PropertySource注解基本使用
PropertySource与Spring版本
Spring4.3版本后的执行逻辑
xml与properties文件分析ne
PropertySourceFactory分析
自定义PropertySourceFactory读取yaml