Spring高级注解@PropertySource详细解读
Spring注解@PropertySource
@PropertySource注解用于指定资源文件读取的位置,它不仅能读取properties文件,也能读取xml文件,并且通过YAML解析器,配合自定义PropertySourceFactory实现解析yaml文件
读取properties文件
在resources资源目录下存在datasource-config.properties,要加载此文件中的配置,需要用到@PropertySource注解,具体如下:
datasource-config.properties文件
druid.driverClassName=com.mysql.jdbc.Driver druid.url=jdbc:mysql://127.0.0.1/db1?useUnicode=true&characterEncoding=UTF-8 druid.username=root druid.password=123456
加载配置类
@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); } }
读取xml文件
在resources资源目录下存在datasource-config.xml,要加载此文件中的配置,需要用到@PropertySource注解,具体如下:
加载配置类
@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&characterEncoding=UTF-8</entry> <entry key="druid.username">root</entry> <entry key="druid.password">5201314..a</entry> </properties>
读取yaml文件
如果想通过@PropertySorce注解加载yaml文件,需要配合自定义PropertySourceFactory实现。
添加依赖
<dependency> <groupId>org.yaml</groupId> <artifactId>snakeyaml</artifactId> <version>1.23</version> </dependency>
自定义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 { //创建一个YAML解析工厂。 YamlPropertiesFactoryBean factory = new YamlPropertiesFactoryBean(); //设置资源。 factory.setResources(encodedResource.getResource()); //获取解析后的Properties对象 Properties properties = factory.getObject(); //返回。此时不能像默认工厂那样返回ResourcePropertySource对象 ,要返回他的父类PropertiesPropertySource对象。 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&characterEncoding=UTF-8 username: root password: 123456
加载配置类
@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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