Spring中的@ImportResource

2023-09-10 阅读 35 评论 0

摘要：简介这个注解很简单，就是导入spring的xml配置文件直接来看spring官方文档： import java.util.Scanner。In applications where @Configuration classes are the primary mechanism for configuring the container, it will still likely be necessary to

简介

这个注解很简单，就是导入spring的xml配置文件

直接来看spring官方文档：

import java.util.Scanner。In applications where @Configuration classes are the primary mechanism for configuring the container, it will still likely be necessary to use at least some XML. In these scenarios, simply use @ImportResource and define only as much XML as is needed. Doing so achieves a "Java-centric" approach to configuring the container and keeps XML to a bare minimum.

当我们使用java配置类的时候,比如springboot工程,就推荐使用java配置类,理论上我们可以完全消除xml配置文件，但是有时候我们需要导入spring的xml配置文件，就需要使用这个注解

举例：

首先是我们的java配置类

@Configuration
@ImportResource("classpath:/com/acme/properties-config.xml")
public class AppConfig {@Value("${jdbc.url}")private String url;@Value("${jdbc.username}")private String username;@Value("${jdbc.password}")private String password;@Beanpublic DataSource dataSource() {return new DriverManagerDataSource(url, username, password);}
}

properties-config.xml
<beans><context:property-placeholder location="classpath:/com/acme/jdbc.properties"/>
</beans>

jdbc.properties

jdbc.properties
jdbc.url=jdbc:hsqldb:hsql://localhost/xdb
jdbc.username=sa
jdbc.password=

运行测试方法：

public static void main(String[] args) {ApplicationContext ctx = new AnnotationConfigApplicationContext(AppConfig.class);TransferService transferService = ctx.getBean(TransferService.class);// ...结果略
}