java - 如何在 Spring 4 MVC 中使用 javax.validation 和 JSON 请求？

Question

我正在使用 Spring 4 MVC 开发 Web 应用程序。我想知道我是否可以使用 javax.validation API 验证 JSON 请求对象。例如，我有这段 entity 代码:

    ...       
    @JsonProperty("cheFecha")
    @NotNull
    @Column(name = "che_fecha")
    @Temporal(TemporalType.DATE)
    @DateTimeFormat(style = "M-")
    private Date SsiCheque.cheFecha;

    @JsonProperty("cheMonto")
    @NotNull
    @JsonSerialize(using = CurrencySerializer.class)
    @Column(name = "che_monto", precision = 10, scale = 2)
    private BigDecimal SsiCheque.cheMonto;
    ...

我有 Controller 代码:

@RequestMapping(value = "/addCheck", method = RequestMethod.POST)
public @ResponseBody SsiCheque addChecks(@Valid SsiCheque ssiCheque, BindingResult result) {

    //ssiCheque.persist();
    System.out.println("add" + result.getErrorCount());// Zero when there are errors
    return ssiCheque;
}

最后我有了 jQuery 代码:

    var formData = $("#formAddChecks :input").serializeArray();
    $.ajax({
        type: "POST",
        url: "addCheck",
        data: formData,
        beforeSend: function ( xhr ) {
            console.log("before Send");
        },
        error: function (request, status, error) {            
            console.log('Error ' + "\n" + status + "\n" + error);
        },
        success: function(data) {
            console.log(data);
        }
    });

JSON 对象正确到达 Controller ，但我想使用实体 javax.annotations API 验证 JSON。我所看到的只是使用自定义 validator 和“重写”验证代码。

这是验证 JSON 的唯一方法吗？

提前致谢!

更新 1

我遵循了@James Massey 的建议，现在我的代码如下所示:

Controller

@RequestMapping(value = "/addCheck", method = RequestMethod.POST)
@ResponseBody
public SsiCheque addChecks(@Valid @RequestBody SsiCheque ssiCheque, BindingResult result) {

    //ssiCheque.persist();
    System.out.println("agregar " + result.getErrorCount());
    return ssiCheque;
}

Javascript 文件

    var ssiCheque = {
            cheNumero : $("#formAddChecks cheNumero").val(),
            cheRecepto : $("#formAddChecks cheReceptor").val(),
            cheMonto : $("#formAddChecks cheMonto").val(),
            cheFecha : $("#formAddChecks cheFecha").val(),
            cheConcepto : $("#formAddChecks cheConcepto").val()
    };


    $.ajax({
        type: "POST",
        contentType: "application/json",
        url: "addCheck",
        data: ssiCheque,
        dataType: "json",
        beforeSend: function ( xhr ) {
            console.log("before Send");
        },
        error: function (request, status, error) {            
            console.log('Error ' /*+ request.responseText*/ + "\n" + status + "\n" + error);
        },
        success: function(data) {
            console.log(data);
        }
    });

但是当我提交表单并执行 Ajax 函数 时，我收到了 400 错误(不正确的请求)。我以前遇到过这个错误，当时json对象格式和 Controller 规范不兼容，但这次我不知道为什么会出错。

再次感谢!

Answer 1

我已经用另一种方式解决了我的验证问题。假设我有代理对象:

public class Agent {
    public int userID;
    public String name;
    public boolean isVoiceRecorded;
    public boolean isScreenRecorded;
    public boolean isOnCall;
}

我想验证:(1) 用户ID>0(2) 姓名为必填项(3) isVoiceRecorded 和isScreenRecorded 只有在isOnCall 为真时才能为真。

为此，我需要添加依赖项:

<dependency>
    <groupId>javax.validation</groupId>
    <artifactId>validation-api</artifactId>
</dependency>

现在看看 Agents 类的样子:

@NoArgsConstructor
@ToString
@EqualsAndHashCode(of = "userID")
@CheckBools
public class Agent {
    @Min(0)
    public int userID;
    @NotNull(message = "Name cannot be null")
    public String name;
    public boolean isVoiceRecorded;
    public boolean isScreenRecorded;
    public boolean isOnCall;
    public LocalDateTime startEventDateTime;
}

(1) @Min(0) - 解决 userID>0(2) @NotNull(message = "Name cannot be null") - 解决 name 是强制性的，你有如何指定错误消息的例子(3) 我定义的@CheckBools 注解，在类级别检查isVoiceRecorded 和isScreenRecorded 只有在isOnCall 为真时才能为真。

@Documented
@Constraint(validatedBy = MyConstraintValidator.class)
@Target({TYPE, ANNOTATION_TYPE})
@Retention(RUNTIME)
public @interface CheckBools {
    String message() default "'isVoiceRecorded' or 'isScreenRecorded' can be true only if you are on call";

    Class<?>[] groups() default {};

    Class<? extends Payload>[] payload() default {};
}

在下面的类中定义规则

public class MyConstraintValidator implements ConstraintValidator<CheckBools, Agent> {
     @Override
    public void initialize(CheckBools constraintAnnotation) {

    }

    @Override
    public boolean isValid(Agent value, ConstraintValidatorContext context) {
        if (!value.isOnCall && (value.isVoiceRecorded || value.isScreenRecorded))
            return false;
        else return true;
    }
}

在 Controller 层:

@RestController
@RequestMapping("Myteamview")
public class MyteamviewController {
    @Autowired
    AgentInfo agentInfo;

    @RequestMapping(path = "agents", method = RequestMethod.POST)
    public ResponseEntity<Boolean> addOrUpdateAgent(@Valid @RequestBody Agent agent) {
        ResponseEntity<Boolean> responseEntity = new ResponseEntity<>(agentInfo.addAgent(agent),HttpStatus.OK);
        return responseEntity;
    }
}

注意:重要的是你在@RequestBody代理之前指定@Valid