一，bean的装配

　　bean是依赖注入的，通过spring容器取对象的。

　　装配方法有：

　　

 

 

前面两种没什么好讲的，就改改参数就好了。

 

这里重要讲注解。

注解的主要类型见图，其中component是bean，repository，service，controller都是spring中的DAO层，service层和controller层的bean，autowired和resourcey用来对bean的属性进行标注。

一个注解的例子：

package com.itheima.annotation;

public interface UserDao {
	public void save();
}
package com.itheima.annotation;

@Repository("userDao")
public class UserDaoImpl implements UserDao{
	public void save(){
		System.out.println("userdao--save()");
	}
}
package com.itheima.annotation;

public interface UserService {
	public void save();
}
package com.itheima.annotation;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

@Service("userService")
public class UserServiceImpl implements UserService{
	@Resource(name ="userDao")
	private UserDao userDao;
	public void save(){
		System.out.println("userservice...save..");
	}
}

　　

package com.itheima.annotation;

import javax.annotation.Resource;

import org.springframework.stereotype.Controller;

@Controller("userController")
public class UserController {
	@Resource(name = "userService")
	private UserService userService;
	public void save(){
		this.userService.save();
		System.out.println("UserController...save...");
	}
}

　

xml配置文件配置context的属性

<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"
 xmlns:mvc="http://www.springframework.org/schema/mvc"
 xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.1.xsd
 http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
	<!-- 使用context,开启注解处理器 -->
	<context:annotation-config />
		<bean id = "userDao" class = "com.itheima.annotation.UserDaoImpl"/>
		<bean id = "userService" class = "com.itheima.annotation.UserServiceImpl"/>
		<bean id = "userController" class = "com.itheima.annotation.userControllerImpl"/>
</beans>

　　

　

 

 

package com.itheima.annotation;
import javax.annotation.Resource;
import org.springframework.stereotype.Controller;
@Controller("userController")public class UserController {@Resource(name = "userService")private UserService userService;public void save(){this.userService.save();System.out.println("UserController...save...");}}