Spring 泛型依赖注入

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

具体代码

1、User.java

 package com.proc.bean;

 public class User {

 }

2、BaseRepository.java

 package com.proc.repository;

 public class BaseRepository<T> {

 }

3、BaseService.java

 package com.proc.service;

 import org.springframework.beans.factory.annotation.Autowired;

 import com.proc.repository.BaseRepository;

 public class BaseService<T> {

     @Autowired
     protected BaseRepository<T> baseRepository;

     public void save(){
         System.out.println("save ………………");
         System.out.println(baseRepository);
     }
 }

4、UserRepository.java

 package com.proc.repository;

 import org.springframework.stereotype.Repository;

 import com.proc.bean.User;

 @Repository
 public class UserRepository extends BaseRepository<User> {

 }

5、UserService.java

 package com.proc.service;

 import org.springframework.stereotype.Service;

 import com.proc.bean.User;

 @Service
 public class UserService extends BaseService<User>{

 }

6、xml配置

<context:component-scan base-package="com.proc" />

7、代码测试

 ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");
 UserService userService=(UserService) ctx.getBean("userService");
 userService.save();

输出结果：

save ………………
com.proc.repository.UserRepository@15bfd87

这里可以看到对象的类型为UserRepository