Spring4范型service注入

实体

public class User implements Serializable {  
    private Long id;  
    private String name;  
}  
  
public class Organization implements Serializable {  
    private Long id;  
    private String name;  
}

数据访问Repository

public abstract class BaseRepository<M extends Serializable> {  
    public void save(M m) {  
        System.out.println("=====repository save:" + m);  
    }  
}  
  
@Repository  
public class UserRepository extends BaseRepository<User> {  
}  
  
@Repository  
public class OrganizationRepository extends BaseRepository<Organization> {  
}

之前的注入的服务: 每个必须写个setter

public abstract class BaseService<M extends Serializable> {  
    private BaseRepository<M> repository;  
    public void setRepository(BaseRepository<M> repository) {  
        this.repository = repository;  
    }  
    public void save(M m) {  
        repository.save(m);  
    }  
}  

@Service  
public class UserService extends BaseService<User> {  
    @Autowired  
    public void setUserRepository(UserRepository userRepository) {  
        setRepository(userRepository);  
    }  
}  
  
@Service  
public class OrganizationService extends BaseService<Organization> {  
    @Autowired  
    public void setOrganizationRepository(OrganizationRepository organizationRepository) {  
        setRepository(organizationRepository);  
    }  
}

范型注入的服务

// 抽象服务类
public abstract class BaseService<M extends Serializable> {  

    // 这里发生了范型注入！！！！！！！
    @Autowired  
    protected BaseRepository<M> repository;  
  
    public void save(M m) {  
        repository.save(m);  
    }  
}  

// 具体的用户服务类  
@Service  
public class UserService extends BaseService<User> {  
}  
  
// 具体的组织服务类
@Service  
public class OrganizationService extends BaseService<Organization> {  
}

Published: August 21 2014

category:
java 16