Spring Boot one request mapping for multiple input types

Question

So Let's say that I have an endpoint:

POST /answer

Currently It only receives one answer from user.

{
    "question": "3+5",
    "answer": "8"
}

I'm curious It is possible to receive multiple answers, for the same endpoint.

[
    {
        "question": "3+5",
        "answer": "8"
    },
    {
        "question": "9+3",
        "answer": "12"
    }
]

I'm using Spring Boot 1.5.1. Here's the controller code that I'm using:

@RequestMapping(value = "/answer", method = RequestMethod.POST)
public Response submitAnswer(SubmitAnswerRq rq) {
    return service.submitAnswer(rq);
}

Any ideas?

@LipingHuang Looks like the client should send the request in forms of array, even if It contains only one item in it. this is not what I wanted to do.. — Tura
– Tura, Commented Oct 19, 2018 at 3:01

xxy · Accepted Answer · 2018-10-19 02:22:36Z

2

Don't do this One answer is different from multi answers. Don't complicated simple things.

I recommend your write a new end point something like /multiAnswer

@RequestMapping(value = "/multiAnswer", method = RequestMethod.POST)
public Response submitAnswer(SubmitMultiAnswerRq rq) {
    return service.submitAnswer(rq);
}

public class SubmitMultiAnswerRq {
    private List<SubmitAnswerRq> answers;
    //getter and setter
}

answered Oct 19, 2018 at 2:22

xxy

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2 Comments

Tura Over a year ago

Well.. It is more clear and I tend to use this, but I'm just curious If it is possible.

xxy Over a year ago

Maybe is possible. I have no idea. Springmvc automatically converts json into an object. It is unreasonable to convert different jsons into same object.

kj007 · Accepted Answer · 2018-10-19 03:15:23Z

1

Use List to receive as array..so when you have one question then send also under array:

[{
    "question": "3+5",
    "answer": "8"
}]

and same n numbers of answers you can send in request, make sure your service handle as a list and you should be good.

@RequestMapping(value = "/answer", method = RequestMethod.POST)
public Response submitAnswer(List<SubmitAnswerRq> rq) {
    return service.submitAnswer(rq);
}

answered Oct 19, 2018 at 3:15

kj007

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1 Comment

Tura Over a year ago

Yes I can do that, but I was looking for something like Spring settings to mapping different input types for same endpoint. Besides, I use this approach for now. Thanks for reply.

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