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spring：使用注解@获取第三方bean实例

news 2025/9/19 20:10:43

因为第三方给的bean实例封装在jar包中，无法通过给类添加注解@Component后再获取bean实例，我们可以通过给方法添加注解@Bean，获取bean实例（方法的返回值就是第三方bean实例）。

可获取第三方bean的类

package com.annotation.thirdjar;import java.util.Date;import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;/*** @copyright 2003-2025* @author    qiao wei* @date      2025-04-16* @version   1.0* @brief     * @history   name*            date*            brief*/
@Component(value = "factory")
public class DateFactory {public DateFactory() {}@Bean(name = "getDate001")public Date getDate() {return new Date();}
}

配置类，将DateFactory加载。

package com.annotation.config;import org.springframework.context.annotation.ComponentScan;/* ** @copyright 2003-2025* @author    qiao wei* @date      2025-06-11* @version   1.0* @brief     * @history   name*            date*            brief*/
@ComponentScan(basePackages = "com.annotation")
public class Config {
}

测试类：

package com.annotation.thirdjar;import java.util.Date;import org.junit.jupiter.api.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;import com.annotation.config.Config;/* ** @copyright 2003-2025* @author    qiao wei* @date      2025-06-11* @version   1.0* @brief     * @history   name*            date*            brief*/
class DateFactoryTest {@Testpublic void test01() {ApplicationContext context =new AnnotationConfigApplicationContext(Config.class);Date date = (Date) context.getBean("getDate001");System.out.println(date);}
}

运行结果：