Deserialize Params into object

Question

I have a URL abc.com/loc/lat=90.6&long=44.6&sf='random' here lat and long are required and sf is an optional param. I have created a class with these three as data members, how can I deserialize those params into that class object?

Answer 1

SpringMVC will do that 'mapping' for you.

Look at the following piece of code.

There is a REST controller with one method. It expects the Request object. This object has three fields, just like you need. All of your street parameters will be mapped to the object fields automatically.

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestController {

    @GetMapping("/loc")
    public @ResponseBody
    Request myAction(Request reqObject) {
        System.out.println("reqObject = " + reqObject);
            return reqObject;
    }
}

class Request {
    float lat;
    float longt;
    String sf;

    public float getLat() {
        return lat;
    }

    public void setLat(float lat) {
        this.lat = lat;
    }

    public float getLong() {
        return longt;
    }

    public void setLong(float longt) {
        this.longt = longt;
    }

    public String getSf() {
        return sf;
    }

    public void setSf(String sf) {
        this.sf = sf;
    }

    @Override
    public String toString() {
        return "Request{" +
                "lat=" + lat +
                ", longt=" + longt +
                ", sf='" + sf + '\'' +
                '}';
    }
}

How to call it:

http://localhost:8080/loc?lat=90.6&long=44.6&sf=random

This is what you will get printed out:

{"lat":90.6,"sf":"random","long":44.6}

Try this out.

Note, how I had to name your long variable differently, this is because long is a reserved keyword in Java. We can't use it for a variable name. But we can define getters and setters in a way we like. getLong and setLong allow us to map 'long' parameter to the variable we need.

------------ Version of POJO class for Lombock lovers:

   @Data
    @ToString
    class Request {
        @NonNull
        float lat;
        @NonNull
        float longt;

        String sf;
    }  

With Lombok adding its magic, I have not found a way to handle your long input parameter. I suggest you to change it to 'longt' to make it work.

You will be calling your service like this:

http://localhost:8080/loc?lat=90.6&longt=44.6&sf=random