Spring依赖注入方式(Dependency Injection)

@RestController
@RequiredArgsConstructor
public class WarningTaskController {
    // 注意使用 final 标记不可变
    private final WarningTaskService taskService;
    // 多个依赖可以
}

@ConfigurationProperties(prefix = "spring.security")
public class SecurityProperties {
    // 省略一些非必要的代码
	
	private final User user = new User();

	public User getUser() {
		return this.user;
	}


	public static class User {

		private String name = "user";
		private String password = UUID.randomUUID().toString();
		private List<String> roles = new ArrayList<>();

		private boolean passwordGenerated = true;

		public String getName() {
			return this.name;
		}

		public void setName(String name) {
			this.name = name;
		}

		// 省略其他 getter/setter
	}

}

@RestController
public class WarningTaskController {

    // 不推荐使用
    // 如果依赖非常多，代码会很臃肿
    @Autowired
    private final WarningTaskService taskService;

}

@RestController
public class WarningTaskController {
    private WarningTaskService taskService;

    // 不推荐 如果对象是可变的
    @Autowired
    public void configure(WarningTaskService taskService) {
        this.taskService = taskService;
    }

    // 其他业务逻辑...
}