Spring4.0新特性--泛型依赖注入

1)Spring4.0可以为子类注入子类的泛型类型,成员变量的引用

  下面UML图来说名关系  

  

    BaseService<T>:有RoleService和UserService两的子类

    BaseRepepositry<T>:有UserRepository和RoleRepositry两个子类

    由于BaseService<T>和BaseRepepositry<T>有关系所以,得出下面的子类也存在这样的关系

2)用代码来说话

1.---User.java

1 package com.baba.miao.test.generic.di;
2 
3 public class User {
4 
5 }
User

 

2.---UserRepository.java

1 package com.baba.miao.test.generic.di;
2 
3 import org.springframework.stereotype.Repository;
4 
5 @Repository   //交给IOC容器来管理
6 public class UserRepository extends BaseRepository<User>{
7 
8 }
UserRepository

3.---UserService.java

1 package com.baba.miao.test.generic.di;
2 
3 import org.springframework.stereotype.Repository;
4 
5 @Repository  //交给IOC容器来管理
6 public class UserService extends BaseService<User>{
7 
8 }
UserService

4.---BaseService.java

 1 package com.baba.miao.test.generic.di;
 2 
 3 import org.springframework.beans.factory.annotation.Autowired;
 4 
 5 public class BaseService <T>{
 6 
 7         //关键所在    
 8     @Autowired
 9     protected BaseRepository<T> repository;
10     
11     public void add(){
12         System.out.println("adding....");
13         
14         System.out.println(repository);
15     }
16 }
17     
BaseService

5.---BaseRepository.java

1 package com.baba.miao.test.generic.di;
2 
3 public class BaseRepository <T>{
4 
5 }
BaseRepository

6.Test---Main.java  (测试)

 1 package com.baba.miao.test.generic.di;
 2 
 3 import org.springframework.context.ApplicationContext;
 4 import org.springframework.context.support.ClassPathXmlApplicationContext;
 5 
 6 public class Main {
 7 
 8     public static void main(String[] args) {
 9         ApplicationContext applicationContext = new ClassPathXmlApplicationContext(
10                 "beans-generic.xml");
11 
12         UserService userService = (UserService) applicationContext
13                 .getBean("userService");
14 
15         userService.add();
16 
17     }
18 }
Main

7.配置文件

1 <?xml version="1.0" encoding="UTF-8"?>
2 <beans xmlns="http://www.springframework.org/schema/beans"
3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4     xmlns:context="http://www.springframework.org/schema/context"
5     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
6         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
7 
8 <context:component-scan base-package="com.baba.miao.test.generic.di"></context:component-scan>
9 </beans>
beans-generic.xml

  好了通过上面的代码就可以说明问题了

 

 

 

                    

                本人是一个Java爱好者,欢迎交流

                             ----By 小苗

posted @ 2014-03-21 22:01  天天AC  阅读(2155)  评论(0编辑  收藏  举报