总结:
通过xml配置文件引用@Configuration的配置的方法如下: 标注了@Configureation的配置类本身相当于一个标注了@Componet的类,一样也是一个bean,它可以被Spring的<context:component-scan>扫描到。因此,如果希望将此配置类组装到xml配置文件中,通过xml配置文件启动Spring容器,仅在xml文件中通过<context:component-scan>扫描到相应的配置类就ok了。
直接上代码。。。。。。
Java配置类:
package com.study.spring.bean.javaClassBean; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; @Configuration @ComponentScan(basePackageClasses = UserDao.class) public class SpringBeansConfig { /** * 配置Bean时,在该方法上使用@Bean注解 * @return */ @Bean(name = "userDao") public UserDao getUserDao() { return new UserDao(); } @Bean(name = "userDaoTemp") public UserDao getUserDaoTemp() { return new UserDao(); } }
xml配置文件:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <context:component-scan base-package="com.study.spring.bean.javaClassBean"/> </beans>
其中,业务层代码不变。
测试类:
package com.study.spring.bean.javaClassBean; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.context.ApplicationContext; import org.springframework.context.annotation.AnnotationConfigApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class TestJavaClassBean { @Autowired private static UserService userService; //@Qualifier("userDaoTemp") //private static UserDao userDao; public static void main(String[] args) { //方法一:AnnotationConfigApplicationContext类通过标注@Configuration的Java类启动Spring容器。 //ApplicationContext context = new AnnotationConfigApplicationContext(SpringBeansConfig.class); //AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(); //方法二:AnnotationConfigApplicationContext支持通过编码的方式加载多个@Configuration配置类,然后通过刷新容器因应用这些配置类。 //注册一个活或多个@Configuration配置类 //context.register(SpringBeansConfig.class); //继续注册@Configuration配置类 //context.register(SpringConfig.class); //刷新容器以应用这些注册的配置类 //context.refresh(); ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("conf/spring/spring-conf.xml"); //UserDao userDao = (UserDao)context.getBean("userDaoTemp"); //List<User> userList = userDao.queryUserList(); UserService userService = (UserService)context.getBean("userService"); List<User> userList = userService.queryUserList(); if (null != userList) { for (User user : userList) { System.out.println(user); } } else { System.out.println("userList is null..."); } context.destroy(); } }
测试结果: