Spring中的@ImportResource

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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：

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;

    @Bean

    public 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

}