为什么我的JSON文档解析方法只返回一个元素的列表?

时间:2019-03-01 14:08:08

标签: java json parsing simplejson

我正在开发Java版本的棋盘游戏RoboRally,目前正在研究一个类,该类将JSON文档解析为生成游戏棋盘的一部分。它几乎可以按预期工作,但效果不尽人意。

JSON文档的格式设置为坐标系,其中包含有关板上的内容以及其位置的信息。方法generateJsonBoard()应该解析文档中的信息。它返回一个ICell [] []数组,其中该数组上的每个Cell对象在该单元格的顶部都包含一个片段列表。

该方法几乎可以工作,但是当JSON数组中有多个元素时,它将遇到问题。似乎只选择数组的最后一个元素,然后将其添加到列表中,而忽略其他元素。

我的问题真的归结为是否有人看到即使我的JSON数组包含多个元素(例如在location [0] [0]中),为什么Cell对象中的List列表也只有一个元素。

这是JSON文档的一部分

{
	"0": {
		"0": ["NorthWall","FlagOne","FlagTwo","FlagThree"],
		"1": ["NorthWall"],
		"2": ["NorthWall"],
		"3": ["NorthWall"],
		"4": ["NorthWall"],
		"5": ["NorthWall"],
		"6": ["NorthWall"],
		"7": ["NorthWall"],
		"8": ["NorthWall"],
		"9": ["NorthWall"]
		},
	"1": {
		"0": ["WestWall"],
		"1": [],
		"2": [],
		"3": [],
		"4": [],
    ...
    ...

这是Java代码。

public class JSONBoardGenerator {

JSONParser parser = new JSONParser();

public ICell[][] generateJsonBoard(String filepath) {

    ICell[][] jsonBoardPieceList2 = null;

    try {
        Object boardFile = parser.parse(new FileReader(filepath));
        JSONObject jsonBoardFile = (JSONObject) boardFile;
        int jsonSize = jsonBoardFile.size();
        int jsonSide = jsonSize / jsonSize;
        jsonBoardPieceList2 = new ICell[10][10];
        System.out.println(jsonBoardFile);
        for (int x = 0; x <= 9; x++) {
            for (int y = 0; y <= 9; y++) {

                String intX = Integer.toString(x);
                String intY = Integer.toString(y);

                JSONObject xCord = (JSONObject) jsonBoardFile.get(intX);
                JSONArray yCord = (JSONArray) xCord.get(intY);
                Iterator<String> iterator = yCord.iterator();
                while (iterator.hasNext()) {
                    Cell tempCell = new Cell();
                    jsonBoardPieceList2[x][y] = tempCell;
                    String jsonIterator = iterator.next();
                    System.out.println(jsonIterator);
                    switch (jsonIterator) {
                        case "Hole":
                            System.out.println("Making Hole!");
                            break;

                        case "NorthWall":
                            System.out.println("Making northfacing wall!");
                            tempCell.addPiece(new Wall(Direction.NORTH));
                            break;

                        case "EastWall":
                            System.out.println("Making eastfacing wall!");
                            tempCell.addPiece(new Wall(Direction.EAST));
                            break;

                        case "SouthWall":
                            System.out.println("Making southfacing wall!");
                            tempCell.addPiece(new Wall(Direction.SOUTH));
                            break;

                        case "WestWall":
                            System.out.println("Making westfacing wall!");
                            tempCell.addPiece(new Wall(Direction.WEST));
                            break;

                        /**
                         case "ConveyorNorth":
                         System.out.println("Making northfacing conveyor!");
                         new Conveyor(Direction.NORTH, 1);
                         break;

                         case "ConveyorEast":
                         System.out.println("Making eastfacing conveyor!");
                         new Conveyor(Direction.EAST, 1);
                         break;

                         case "ConveyorSouth":
                         System.out.println("Making southfacing conveyor!");
                         new Conveyor(Direction.SOUTH, 1);
                         break;

                         case "ConveyorWest":
                         System.out.println("Making westfacing conveyor!");
                         new Conveyor(Direction.WEST, 1);
                         break;
                         */

                        case "FlagOne":
                            System.out.println("Making flag number 1");
                            tempCell.addPiece(new Flag(1));
                            break;

                        case "FlagTwo":
                            System.out.println("Making flag number 2");
                            tempCell.addPiece(new Flag(2));
                            break;

                        case "FlagThree":
                            System.out.println("Making flag number 3");
                            tempCell.addPiece(new Flag(3));
                            break;
                    }
                }
            }
        }
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (ParseException e) {
        e.printStackTrace();
    }
    return jsonBoardPieceList2;
}

}

1 个答案:

答案 0 :(得分:0)

把它弄坏了。使用简单的JSON可以正常工作。唯一的问题是我将Cell tempCell = new Cell();太深。它应该在for循环内,而不是while迭代器内。谢谢大家的建议:)