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Spring高級(jí)注解@PropertySource詳細(xì)解讀

更新時(shí)間：2023年11月23日 09:40:17 作者：chaojunma

這篇文章主要介紹了Spring高級(jí)注解@PropertySource詳細(xì)解讀,@PropertySource注解用于指定資源文件讀取的位置,它不僅能讀取properties文件,也能讀取xml文件,并且通過(guò)YAML解析器,配合自定義PropertySourceFactory實(shí)現(xiàn)解析yaml文件,需要的朋友可以參考下

Spring注解@PropertySource

@PropertySource注解用于指定資源文件讀取的位置，它不僅能讀取properties文件，也能讀取xml文件，并且通過(guò)YAML解析器，配合自定義PropertySourceFactory實(shí)現(xiàn)解析yaml文件

讀取properties文件

在resources資源目錄下存在datasource-config.properties，要加載此文件中的配置，需要用到@PropertySource注解，具體如下：

datasource-config.properties文件

druid.driverClassName=com.mysql.jdbc.Driver
druid.url=jdbc:mysql://127.0.0.1/db1?useUnicode=true&amp;characterEncoding=UTF-8
druid.username=root
druid.password=123456

加載配置類

@Slf4j
@Setter
@Getter
@Configuration
@PropertySource(value = "classpath:datasource-config.properties")
@ConfigurationProperties(prefix = "druid")
public class SpringConfig {
 
    @Value("${druid.driverClassName}")
    private String driverClassName;
 
    @Value("${druid.url}")
    private String url;
 
    @Value("${druid.username}")
    private String username;
 
    @Value("${druid.password}")
    private String password;
 
 
    @Bean
    public void druidDataSource(){
        log.info("driverClassName:[{}], url:[{}], username:[{}], password:[{}]", driverClassName, url, username, password);
    }
}

讀取xml文件

在resources資源目錄下存在datasource-config.xml，要加載此文件中的配置，需要用到@PropertySource注解，具體如下：

加載配置類

@Slf4j
@Setter
@Getter
@Configuration
@PropertySource(value = "classpath:datasource-config.xml")
@ConfigurationProperties(prefix = "druid")
public class SpringConfig {
 
    @Value("${druid.driverClassName}")
    private String driverClassName;
 
    @Value("${druid.url}")
    private String url;
 
    @Value("${druid.username}")
    private String username;
 
    @Value("${druid.password}")
    private String password;
 
 
    @Bean
    public void druidDataSource(){
        log.info("driverClassName:[{}], url:[{}], username:[{}], password:[{}]", driverClassName, url, username, password);
    }
}

datasource-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
    <entry key="druid.driverClassName">com.mysql.jdbc.Driver</entry>
    <entry key="druid.url">jdbc:mysql://127.0.0.1/db1?useUnicode=true&amp;characterEncoding=UTF-8</entry>
    <entry key="druid.username">root</entry>
    <entry key="druid.password">5201314..a</entry>
</properties>

讀取yaml文件

如果想通過(guò)@PropertySorce注解加載yaml文件,需要配合自定義PropertySourceFactory實(shí)現(xiàn)。

添加依賴

<dependency>
    <groupId>org.yaml</groupId>
    <artifactId>snakeyaml</artifactId>
    <version>1.23</version>
</dependency>

自定義PropertySourceFactory

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 encodedResource) throws IOException {
        //創(chuàng)建一個(gè)YAML解析工廠。
        YamlPropertiesFactoryBean factory = new YamlPropertiesFactoryBean();
        //設(shè)置資源。
        factory.setResources(encodedResource.getResource());
 
        //獲取解析后的Properties對(duì)象
        Properties properties = factory.getObject();
        //返回。此時(shí)不能像默認(rèn)工廠那樣返回ResourcePropertySource對(duì)象 ，要返回他的父類PropertiesPropertySource對(duì)象。
        return name != null ? new PropertiesPropertySource(name, properties) :
                new PropertiesPropertySource(encodedResource.getResource().getFilename(),properties);
    }
}

datasource-config.yaml

druid:
  driverClassName: com.mysql.jdbc.Driver
  url: jdbc:mysql://127.0.0.1/db1?useUnicode=true&amp;characterEncoding=UTF-8
  username: root
  password: 123456

加載配置類

@Slf4j
@Setter
@Getter
@Configuration
@PropertySource(value = "classpath:datasource-config.yml", factory = YAMLPropertySourceFactory.class)
@ConfigurationProperties(prefix = "druid")
public class SpringConfig {
 
    @Value("${druid.driverClassName}")
    private String driverClassName;
 
    @Value("${druid.url}")
    private String url;
 
    @Value("${druid.username}")
    private String username;
 
    @Value("${druid.password}")
    private String password;
 
 
    @Bean
    public void druidDataSource(){
        log.info("driverClassName:[{}], url:[{}], username:[{}], password:[{}]", driverClassName, url, username, password);
    }
}

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