将MYSQL日期时间库林转换为JSON-SPRING BOOT

我一直在将MYSQL表值转换为JSON。我的表有以下专栏 entry_time timestamp。以下内容对于数据转换非常有效，但是在将数据转换为JSON时，转换为JSON后我具有以下值

public String convertTableDatatoJSON(String tableNAME) throws SQLException {
    String tableName = tableNAME;
    Connection connection = createConnection();
    JSONArray array = new JSONArray();
    JSONObject jsonObject = new JSONObject();
    List<String> columns = loadColumns(connection, tableName);
    ResultSet dataSet = loadData(connection, tableName);
    while (dataSet.next()) {
        JSONObject record = new JSONObject();
        for (String column : columns) {
            record.put(column, dataSet.getObject(column));
        }
        array.add(record);
    }
    jsonObject.put(tableName, array);
    try {
        FileWriter file = new FileWriter("src/main/resources/JSONdata/" + tableName + ".json");
        file.write(jsonObject.toJSONString());
        file.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return "Data from table " + tableNAME + " is converted to JSON successfully. ";
}

private Connection createConnection() throws SQLException {
    DriverManager.registerDriver(new com.mysql.jdbc.Driver());
    String mysqlUrl = "jdbc:mysql://localhost/parking?autoReconnect=true&useSSL=false";
    Connection connection = DriverManager.getConnection(mysqlUrl, "root", "root");
    return connection;
}


public List<String> loadColumns(Connection connection, String tableName) throws SQLException {
    Statement statement = connection.createStatement();
    ResultSet resultSet = statement.executeQuery("SELECT COLUMN_NAME FROM `INFORMATION_SCHEMA`.`COLUMNS` WHERE TABLE_NAME LIKE '" + tableName + "'");
    List<String> columnsName = new ArrayList<String>();
    while (resultSet.next()) {
        columnsName.add(resultSet.getString("COLUMN_NAME"));
    }
    return columnsName;
}

public ResultSet loadData(Connection connection, String tableName) throws SQLException {
    Statement statement = connection.createStatement();
    ResultSet resultSet = statement.executeQuery("select * from " + tableName + "");

    return resultSet;
}

实际结果：“ entry_time”：0000-00-00 00:00:00

预期结果：“ entry_time”：“ 0000-00-00 00:00:00”

我只想在将表数据转换为时间戳数据类型为JSON 的列时放入逗号。

问题来源于stack overflow