Spring 泛型依賴注入

BaseService<T>:有RoleService和UserService兩的子類

BaseRepepositry<T>:有UserRepository和RoleRepositry兩個子類

由於BaseService<T>和BaseRepepositry<T>有關系所以，得出下面的子類也存在這樣的關系

 

具體代碼

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、代碼測試

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

 

輸出結果：

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

 

這里可以看到對象的類型為UserRepository