Question

我计划生成一个随机数，并使用json-simple将其导出为JSON。我有以下代码

public class Main implements JSONAware{

    private final int data;

    public Main(int data){
        this.data = data;
    }


    public String toJSONString(){
        StringBuffer sb = new StringBuffer();

        sb.append("[");

        sb.append(data);

        sb.append("]");
        sb.append(",");


        return sb.toString();
    }

    public static void main(String[] args){

        JSONArray da = new JSONArray();


        Random generator = new Random();
        int [][] grid;

        grid = new int[128][14];

        for (int row = 0; row < 128; row++){
            for (int col = 0; col < 14; col++){
                grid[row][col] = generator.nextInt(100);
//                da.add("%d",grid[row][col]);
                da.add(grid[row][col]);
            }
//            System.out.println();
        }
        System.out.println(da);

    }

打印如下：

[9,62,6,60,29,28,59,56,67,61,53,23,22,31,15,96,94,85,65,94,15,7,91,...]

但我试图将其打印为

[9,62,6,60,29,28,59,56,67,61,53,23,22,31,15,96,94,85,65,94,15,7,91,...],
[68,48,40,44,47,85,8,43,17,78,35,7,77,26,80,34,19,47,17,0,59,5,79,...],
.
.
.

任何人都可以告诉我如何从列中拆分行？

Answer 1

据我了解你的问题，你想要128行是独立的JsonArray，即1行= 1 JsonArray。
为此你可以这样做：

public static void main(String[] args){

    JSONArray jArray = new JSONArray();

    Random generator = new Random();
    int [][] grid;

    grid = new int[128][14];

    for (int row = 0; row < 128; row++){
        JSONArray da = new JSONArray();
        for (int col = 0; col < 14; col++){
            grid[row][col] = generator.nextInt(100);
            da.add(grid[row][col]);
        }
        jArray.add(da);
    }
    System.out.println(jArray);

}

Answer 2

只需使用javaee提供的Json api即可。它很容易实现。您无需创建任何jsonToString(...)。

import javax.json.Json;
import javax.json.JsonObject;
...
public static void main(String ...args) {

    JsonObjectBuilder jsonBuilder = Json.createObjectBuilder();

    Random generator = new Random();
    int[][] grid;

    grid = new int[128][14];

    for (int row = 0; row < 128; row++) {
        JsonArrayBuilder arrayBuilder = Json.createArrayBuilder();
        for (int col = 0; col < 14; col++) {
            grid[row][col] = generator.nextInt(100);
            arrayBuilder.add(grid[row][col]);
        }
        jsonBuilder.add(Integer.toString(row), arrayBuilder.build());
    }
    JsonObject json = jsonBuilder.build();

    System.out.println(json);
}

好吧，如果你不想使用javaee的json api ，请在你的代码中：

    JSONObject obj=new JSONObject();

    Random generator = new Random();
    int [][] grid;

    grid = new int[128][14];

    for (int row = 0; row < 128; row++){
        JSONArray da = new JSONArray();
        for (int col = 0; col < 14; col++){
            grid[row][col] = generator.nextInt(100);
            da.add(grid[row][col]);
        }
        obj.put(Integer.toString(row), da);
    }
    System.out.println(obj);

如何生成随机数并将其导出为JSON？

2 个答案: