Gson/Json 到数组 java

Question

我有一台连接到 SQLite 数据库的服务器。 从这里我将数据放入 HashMap，然后放入 Json 以通过客户端处理程序发送。

然后我尝试使用 swing 客户端 GUI 将服务器中的数据放入表中。 在客户端，为了确保我正在接收数据，我将回复打印到控制台。

while (true){
            count++;

            if (socket == null){
                guiClientSays("Waiting for connection to be reset...");
                synchronized (waitObject){
                    try{
                        waitObject.wait();
                    }catch (InterruptedException ex){
                        Logger.getLogger(GUIClient.class.getName()).log(Level.SEVERE, null, ex);
                    }
                }
            }
            guiClientSays("Waiting for message" + count + " from server...");
            String reply = null;
            try{
                reply = bufferedReader.readLine();
                guiClientSays("Received \"" + reply + "\" from server.");
            }catch (IOException ex){
                guiClientSays("IOException " + ex);
            }
}

在控制台中我得到这个

Client1: Received "{"1":{"driverId":1,"driverRef":"hamilton","number":"44","code":"HAM","forename":"Lewis","surname":"Hamilton","dob":"07/01/1985","nationality":"British","url":"http://en.wikipedia.org/wiki/Lewis_Hamilton"},"2":{"driverId":2,"driverRef":"heidfeld","number":"","code":"HEI","forename":"Nick","surname":"Heidfeld","dob":"10/05/1977","nationality":"German","url":"http://en.wikipedia.org/wiki/Nick_Heidfeld"},"3":{"driverId":3,"driverRef":"rosberg","number":"6","code":"ROS","forename":"Nico","surname":"Rosberg","dob":"27/06/1985","nationality":"German","url":"http://en.wikipedia.org/wiki/Nico_Rosberg"}, etc

为了确保我可以填充表，我将 GUI 客户端连接到可以正常工作的数据库

ArrayList<Driver> drivers = Driver.readAllDrivers();
        DefaultTableModel model = (DefaultTableModel) driverTable.getModel();

        model.setRowCount(0);
        for (Driver driver : drivers){
            model.addRow(new Object[]{
                    driver.getDriverId(),
                    driver.getDriverRef(),
                    driver.getNumber(),
                    driver.getCode(),
                    driver.getForename(),
                    driver.getSurname(),
                    driver.getDob(),
                    driver.getNationality(),
                    driver.getUrl()
            });
        }

driverTable.setModel(new DefaultTableModel(
                null,
                new String[]{"Driver ID", "Driver Ref", "Number", "Code", "Forename", "Surname", "DOB", "Nationality"
                        , "URL"}
        ));

一旦我得到了服务器要发送的数据，我就尝试了这个：

String driverReply;
            driverReply = reply;



            String rows[] = ((String) driverReply).split("\n");
            Vector<Vector<String>> dataVector = new Vector<Vector<String>>();
            for (String row : rows) {
                row = row.trim();
                Vector<String> data = new Vector<String>();
                data.addAll(Arrays.asList(row.split(",")));
                dataVector.add(data);
            }
            Vector<String> header = new Vector<String>(9);
            header.add("Driver ID");
            header.add("Driver Ref");
            header.add("Number");
            header.add("Code");
            header.add("Forename");
            header.add("Surname");
            header.add("DOB");
            header.add("Nationality");
            header.add("URL");

该图显示了图形用户界面及其输出表格的方式

我应该得到 800 行，它应该像这样显示：

1 hamilton 44 HAM Lewis Hamilton 07/01/1985 英国http://en.wikipedia.org/wiki/Lewis_Hamilton 2 heidfeld HEI Nick Heidfeld 10/05/1977 德国http://en.wikipedia.org/wiki/Nick_Heidfeld

ETC

Answer 1

您可以使用 JsonObject 而不是 String 类型作为 var“reply”。

https://docs.oracle.com/javaee/7/api/javax/json/JsonObject.html

在客户端，你可以这样写：

            JSONParser parser = new JSONParser();

            JSONObject reply = (JSONObject) parser.parse(bufferedReader.readLine());

之后，您可以使用所有回复值设置 DataVector，如下所示：

            Vector<Vector<String>> dataVector = new Vector<Vector<String>>();
            reply.keySet().forEach(rowKeyStr ->
            {
               JSONObject row = (JSONObject)jsonObj.get(rowKeyStr);
               Vector<String> data = new Vector<String>();
               row.keySet().forEach(fieldKeyStr ->
               {
                  String field = (String)jsonObj.get(fieldKeyStr);
                  data.add(field);
               }
               dataVector.add(data);
            });

我希望这对你有帮助。