概念
spring注入对象有三种方法,属性注入,构造器注入,setter注入。但是如果属性太多,一个个写太麻烦,所以lombok提供了一个注解,使用 @RequiredArgsConstructor
lombok会帮助生成一个包含常量
,和标识了@NotNull
的变量私有构造函数。
官方介绍
举例
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
@Resource
private RoleMapper roleMapper;
}
@Service
public class UserServiceImpl implements UserService {
private final UserMapper userMapper;
private final RoleMapper roleMapper;
public UserServiceImpl(UserMapper userMapper, RoleMapper roleMapper) {
this.userMapper = userMapper;
this.roleMapper = roleMapper;
}
}
@Service
public class UserServiceImpl implements UserService {
private final UserMapper userMapper;
public setUserMapper(UserMapper userMapper) {
this.userMapper = userMapper;
}
}
@Service
@RequiredArgsConstructor
public class UserServiceImpl implements UserService {
private final UserMapper userMapper;
private final RoleMapper roleMapper;
}
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