How to add JSON array of array to model

Question

Currently I'm doing an API to fire JSON array of array to mysql. But I don't know how to receive the data to the model class when fire the API. I tried to use ArrayList[] but still cannot make it.

Here is the data that I need to fire.

Controller :

//insert Trip
    @RequestMapping(value = "inserting", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
    public @ResponseBody String add(@RequestBody ArrayList<Trips[]>[] c) {
        LOGGER.debug("start insert to database...");
        for(int i=0;i<c.length;i++){
             //trip = c[i];
            tripsService.saveTrips(trip); 
        }   
        LOGGER.debug("insert successfull...");
        return c.toString();
    }

try doing in your controller ArrayList<Trips[]>[] to ArrayList<ArrayList<Object>> — tino89
– tino89, Commented Mar 29, 2021 at 1:20
in order you can map to this Trips Object you need to have a json structure: key -> value, you have no it, so it will not be able to map — tino89
– tino89, Commented Mar 29, 2021 at 1:22
ArrayList<ArrayList<Object>> able to work but how to convert it to Trips model class? bcsz i need to .save(Trips). — lee yiyang
– lee yiyang, Commented Mar 29, 2021 at 1:26

krishnkant jaiswal · Accepted Answer · 2021-03-29 11:06:42Z

1

It is not recommended to pass Array in JSON format. You should put one wrapper class over you entity trips. something like:

class MyTrips {
    List<Trips> trips = new ArrayList<>();
    //Getter and Setter 
}

At the end receive something like:

//insert Trip
    @RequestMapping(value = "inserting", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
    public @ResponseBody String add(@RequestBody MyTrips myTrips) {
        ArrayList<Trips[]>[] c = myTrips.getTrips();
        LOGGER.debug("start insert to database...");
        for(int i=0;i<c.length;i++){
             //trip = c[i];
            tripsService.saveTrips(trip); 
        }   
        LOGGER.debug("insert successfull...");
        return c.toString();
    }

answered Mar 29, 2021 at 11:06

krishnkant jaiswal

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1 Comment

lee yiyang Over a year ago

but I get this error "cannot convert from List<Trips> to ArrayList<Trips[]>[]" at myTrips.getTrips()

tino89 · Accepted Answer · 2021-03-29 01:42:56Z

0

I think it is not possible to map directly to the object you want, for the I suggest you switch the incoming data type, something like:

public @ResponseBody String add(@RequestBody ArrayList<ArrayList<Object>> c) {

Then, in the controller doing a iteration over each element you have in the array, instantiate the Trips Object, doing use of setter methods, set the values of Trips object

for(int i=0;i<c.length;i++){
    List<Object> tripIncoming = c.get(i);
    Trips trip = new Trips();
    trip.setPropertie1(tripIncoming.get(0))
    trip.setPropertie2(tripIncoming.get(1))

    ....
    .... rest properties
    tripsService.saveTrips(trip); 
}

answered Mar 29, 2021 at 1:42

tino89

1405 bronze badges

4 Comments

lee yiyang Over a year ago

but I have 150++ field to set for the Trips class, any other dynamic way to do it?

tino89 Over a year ago

do you mean the Trip class has 150 fields?

lee yiyang Over a year ago

Actually, I got another model class with 150 ++ field for another project. Bcsz of asking question on here, so I just use the Trip class with less field to try it out with the same method

tino89 Over a year ago

I think you can create a custom method, where you can set the different properties, perhaps you have to write much code

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