Spring学习(三)

今天学习的是Spring中一个bean引用另一个bean,需要更改的只是xml配置文件中的代码,具体代码如下:

实体类User:

public class User {
    private String name;
    private UserService userService;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public UserService getUserService() {
        return userService;
    }
    public void setUserService(UserService userService) {
        this.userService = userService;
    }
}

实体类UserService:

public class UserService {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
    
}

xml文件配置:

<!-- 在user这个bean中引用userservice这个bean -->
    <bean id="user" class="com.bdqn.pojo.User">
        <property name="name" value="zhangsan" />
        <!-- name="userService"表示user类中的userService属性 -->
        <!-- ref="userservice"表示引用下面bean中的id="userservice" -->
        <property name="userService" ref="userservice"/>
    </bean>
    
    <bean id="userservice" class="com.bdqn.pojo.UserService">
        <property name="name" value="lisi"></property>
    </bean>

测试类:

@Test
    public void show(){
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        User user = (User) context.getBean("user");
        System.out.println(user.getName() + " " + user.getUserService().getName());
    }

测试结果: