How to read json with mulitple array in spring mvc controller?

Question

I am sending json from ajax to controller that contain multiple array.

Json Data:

{
    "node": [
        {
            "id": "dev_1",
            "blockId": "11"
        },
        {
            "id": "dev_2",
            "blockId": "15"
        }
    ],
    "connect": [
        {
            "id": "con_5",
            "typeId": "2"
        }
    ],
    "name": "test"
}

Controller:

@RequestMapping(value = "/saveBoard", method = RequestMethod.POST)
    public JsonResponse saveBoard(@RequestBody String jsonData) throws IOException {
        JsonResponse response = new JsonResponse();
        ObjectMapper mapper = new ObjectMapper();
        final JsonNode jsonNode = mapper.readTree(jsonData).get("node");

        if(jsonNode.isArray()) {
            for (final JsonNode nodes : jsonNode) {
                System.out.println("jsonNode : "+ nodes);
            }
        }
        return response;
    }

I have tried with object mapper but not succeed. Here i want to read different array for different classes like node for node class with some specified fields, connect for connect class and string for another use.

UPDATE Contorller:

@RequestMapping(value = "/saveBoard", method = RequestMethod.POST)
    public JsonResponse saveMissionBoard(@RequestBody MissionJsonPojo chartJson) {
        boolean status = false;
        String messsage = "";
        JsonResponse response = new JsonResponse();
        System.out.println("data : " + flowChartJson.getNodes());        
        return response;
    }

Ajax:

 $.ajax({
          url: '<c:url value="/board/saveBoard"/>',
          type: 'POST',
          data: JSON.stringify(chartJson),
          dataType: "json",
          contentType: "application/json",
          success: function(response) {
            console.log("In success");
          },
          error: function (a, b, c) {  }
        });

JSON:

{
    "nodes": [
        {
            "missionDeviceId": "device_1",
            "device": "1",
            "deviceXCoordinate": 79,
            "deviceYCoordinate": 73,
            "blockId": "1##1"
        },
        {
            "missionDeviceId": "device_2",
            "device": "3",
            "deviceXCoordinate": 340,
            "deviceYCoordinate": 146,
            "blockId": "2##5"
        }
    ],
    "connections": [
        {
            "missionConnectionId": "con_5",
            "sourceId": "device_1",
            "targetId": "device_2",
            "device": "2"
        }
    ],
    "name": "test"
}

Node Pojo:

public class Nodes{
    private String missionDeviceId;
    private Integer device;
    private String deviceXCoordinate;
    private String deviceYCoordinate;
    private String blockId; //getters setters
}

Connection Pojo:

public class Connections{    
    private String missionConnectionId;
    private String sourceId;
    private String targetId;
    private Integer device; //getters and setters
}

MissionJsonPojo:

public class MissionJsonPojo{
    private List<Nodes> nodes;
    private List<Connections> connections;
    private String name; //getters and setters
}

Create a POJO that matches the given json, i.e. with 2 lists of objects (preferable one that represents connect and node) and a String — dambros
– dambros, Commented Apr 27, 2016 at 8:38
@dambros can you give me an idea of how will i process json data with that pojo? — Jennifer
– Jennifer, Commented Apr 27, 2016 at 8:48

asg · Accepted Answer · 2016-04-27 08:52:09Z

2

As suggested by @dambros, create a POJO structure like this:

public class Node {
    private String id;
    private String blockId;
    //setter-getters.
}

public class Connect {
    private String id;
    private String typeId;
    //setter-getters.
}

import java.util.List;

public class Payload {
    private List<Node> nodes;
    private List<Connect> connects;
    private String name;
    //setter-getters
}

And change your method signature to:

public JsonResponse saveBoard(@RequestBody Payload payload) throws IOException {

}

This should solve your problem.

answered Apr 27, 2016 at 8:52

asg

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9 Comments

Jennifer Over a year ago

let me try this one.

dambros Over a year ago

This should get the got done. Just receive this POJO as your controller parameter.

Jennifer Over a year ago

It's giving : no single-String constructor/factory method exception

asg Over a year ago

Please add the complete root cause.

asg Over a year ago

Take a look at - stackoverflow.com/questions/8369260/…

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