Spring 常犯的 10 大错误，尤其是第 10 个！

@Entity@NoArgsConstructor@Getterpublic class TopTalentEntity {
    @Id    @GeneratedValue    private Integer id;
    @Column    private String name;
    public TopTalentEntity(String name) {        this.name = name;    }
}

@AllArgsConstructor@NoArgsConstructor@Getterpublic class TopTalentData {    private String name;}

@RestControllerpublic class TopTalentController {
    private final TopTalentRepository topTalentRepository;
    @RequestMapping("/toptal/get")    public List<TopTalentData> getTopTalent() {        return topTalentRepository.findAll()                .stream()                .map(this::entityToData)                .collect(Collectors.toList());    }
    private TopTalentData entityToData(TopTalentEntity topTalentEntity) {        return new TopTalentData(topTalentEntity.getName());    }
}

@RestController@RequestMapping("/toptal")@AllArgsConstructorpublic class TopTalentController {
    private final TopTalentService topTalentService;
    @RequestMapping("/get")    public List<TopTalentData> getTopTalent() {        return topTalentService.getTopTalent();    }}
@AllArgsConstructor@Servicepublic class TopTalentService {
    private final TopTalentRepository topTalentRepository;    private final TopTalentEntityConverter topTalentEntityConverter;
    public List<TopTalentData> getTopTalent() {        return topTalentRepository.findAll()                .stream()                .map(topTalentEntityConverter::toResponse)                .collect(Collectors.toList());    }}
@Componentpublic class TopTalentEntityConverter {    public TopTalentData toResponse(TopTalentEntity topTalentEntity) {        return new TopTalentData(topTalentEntity.getName());    }}

@Valuepublic class ErrorResponse {
    private Integer errorCode;    private String errorMessage;
}

@RequestMapping("/put")public void addTopTalent(@RequestBody TopTalentData topTalentData) {    boolean nameNonExistentOrHasInvalidLength =            Optional.ofNullable(topTalentData)         .map(TopTalentData::getName)   .map(name -> name.length() == 10)   .orElse(true);
    if (nameNonExistentOrInvalidLength) {        // throw some exception    }
    topTalentService.addTopTalent(topTalentData);}

@RequestMapping("/put")public void addTopTalent(@Valid @NotNull @RequestBody TopTalentData topTalentData) {    topTalentService.addTopTalent(topTalentData);}
@ExceptionHandler@ResponseStatus(HttpStatus.BAD_REQUEST)public ErrorResponse handleInvalidTopTalentDataException(MethodArgumentNotValidException methodArgumentNotValidException) {    // handle validation exception}// 此外，我们还必须指出我们想要在 TopTalentData 类中验证什么属性：public class TopTalentData {    @Length(min = 10, max = 10)    @NotNull    private String name;}

@Target({ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER})@Retention(RetentionPolicy.RUNTIME)@Documented@Constraint(validatedBy = { MyAnnotationValidator.class })public @interface MyAnnotation {
    String message() default "String length does not match expected";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
    int value();
}
@Componentpublic class MyAnnotationValidator implements ConstraintValidator<MyAnnotation, String> {
    private int expectedLength;
    @Override    public void initialize(MyAnnotation myAnnotation) {        this.expectedLength = myAnnotation.value();    }
    @Override    public boolean isValid(String s, ConstraintValidatorContext constraintValidatorContext) {        return s == null || s.length() == this.expectedLength;    }}

public class TopTalentData {    @MyAnnotation(value = 10)    @NotNull    private String name;}

@SpringBootApplicationpublic class Application {    public static void main(String[] args) {        SpringApplication.run(Application.class, args);    }}

# set default profile to 'dev'spring.profiles.active: dev
# production database details# 公众号：Web项目聚集地spring.datasource.url: 'jdbc:mysql://localhost:3306/toptal'spring.datasource.username: rootspring.datasource.password:8.2. APPLICATION-DEV.YAML 文件spring.datasource.url: 'jdbc:h2:mem:'spring.datasource.platform: h2

public class TopTalentController {
    private final TopTalentService topTalentService;
    public TopTalentController() {        this.topTalentService = new TopTalentService();    }}

public class TopTalentController {
    private final TopTalentService topTalentService;
    public TopTalentController(TopTalentService topTalentService) {        this.topTalentService = topTalentService;    }}

@Configurationpublic class SampleUnitTestConfig {    @Bean    public TopTalentService topTalentService() {        TopTalentService topTalentService = Mockito.mock(TopTalentService.class);        Mockito.when(topTalentService.getTopTalent()).thenReturn(                Stream.of("Mary", "Joel").map(TopTalentData::new).collect(Collectors.toList()));        return topTalentService;    }}

@ContextConfiguration(classes = { SampleUnitTestConfig.class })

@RunWith(SpringJUnit4Cla***unner.class)@ContextConfiguration(classes = {        Application.class,        SampleUnitTestConfig.class})public class RestAssuredTestDemonstration {
    @Autowired    private TopTalentController topTalentController;
    @Test    public void shouldGetMaryAndJoel() throws Exception {        // given        MockMvcRequestSpecification givenRestAssuredSpecification = RestAssuredMockMvc.given()                .standaloneSetup(topTalentController);
        // when        MockMvcResponse response = givenRestAssuredSpecification.when().get("/toptal/get");
        // then        response.then().statusCode(200);        response.then().body("name", hasItems("Mary", "Joel"));    }
}