Question

我正在尝试通过在请求正文中发送json并将json转换为pojo对象来在pojo对象中使用验证注释。我想要做的是让服务使用这个json，如果对象无效，则返回错误的请求。有谁知道怎么做这个？我已经看过很多教程，展示了如何使用注释进行表单验证，但只是一个简单的json请求呢？

POJO对象：

import play.data.validation.Constraints.*;

public class TestObject {

    @Required
    @Min(0)
    public Integer testInt;

    public Integer getTestInt() {
        return testInt;
    }

    public void setTestInt(Integer testInt) {
        this.testInt = testInt;
    }

}

我可以通过解析json来查看每个元素并以这种方式验证它，但这看起来很荒谬......

import models.Domain;
import play.libs.Json;
import play.mvc.BodyParser;
import play.mvc.Controller;
import play.mvc.Result;
import com.fasterxml.jackson.databind.JsonNode;

public class TestController extends Controller {

    @BodyParser.Of(value = BodyParser.Json.class, maxLength = 10 * 1024)
    public static Result create() {

        JsonNode json = request().body().asJson();

        TestObject testObject = Json.fromJson(json, TestObject.class);

        //would like to validate the object here, based on annotations
        //in the bean object...

        //only if the object is valid, return ok...
        return ok(json);
    }

}

Answer 1

谢谢和平！

由于Play 2.5 Form.form(...)已被弃用。

以下是您现在应该如何做的事情：

private FormFactory formFactory;

@Inject
YourContructor(FormFactory formFactory){
    this.formFactory
}


@BodyParser.Of(value = BodyParser.Json.class, maxLength = 10 * 1024)
public static Result create() {

    JsonNode json = request().body().asJson();

    Form<TestObject > TestObjectValidationForm = formFactory.form(TestObject .class)
                                                            .bind(json);
    if(TestObjectValidationForm .hasErrors())
        return badRequest("Invalid");

    TestObject testObject = Json.fromJson(json, TestObject.class);

    //only if the object is valid, return ok...
    return ok(json);
}

无论如何，我真的不想用表格去做...没有更好的选择吗？

Answer 2

这就是我要做的事情

@BodyParser.Of(value = BodyParser.Json.class, maxLength = 10 * 1024)
public static Result create() {

    JsonNode json = request().body().asJson();

    //this is not neccessary for validation except maybe to be sure the json can be 
    //mapped back to pojo before validating then you'll have to wrap     
    //this statement in a try catch so you can recover from any errors during mapping

    //TestObject testObject = Json.fromJson(json, TestObject.class);

    Form<TestObject> testObjectForm = Form.form(TestObject.class);
    Form<TestObject> testObjForm = testObjectForm.bind(json);

    if(testObjForm.hasErrors){
       doStuff()
    }else{
        return ok(json);
    }
}

播放2.3验证Json请求正文

2 个答案: