0
我想在Intellij平台中用MySQL数据库创建区域图。 我想从MySQL数据库显示面积图中的大气数据。 这是区域图方法代码：在java fxml中使用mysql的区域图
AreaChart areaChart;
public void contAreaTabM(Event event) throws ClassNotFoundException, SQLException, ClassCastException {
//ObservableList<XYChart.Series<Integer, Double>> answer = FXCollections.observableArrayList();
XYChart.Series<Integer, Double> temperature = new XYChart.Series<>();
XYChart.Series<Integer, Double> pressure = new XYChart.Series<>();
XYChart.Series<Integer, Double> humidity = new XYChart.Series<>();
temperature.setName("Temperature");
pressure.setName("Pressure");
humidity.setName("Humidity");
Class.forName("com.mysql.jdbc.Driver");
Connection con= DriverManager.getConnection("jdbc:mysql://localhost/test","root","");
//PreparedStatement pst=con.prepareStatement("Select Username, Password from login where username = ?");
String query = "Select Year_1, Temperature, Pressure, Humidity FROM atomdata";
Statement stmt = con.createStatement();
//pst.setString(1, editUsername.getText());
ResultSet rs = stmt.executeQuery(query);
while(rs.next()) {
temperature.getData().add(new XYChart.Data<>(rs.getInt("Year_1"), rs.getDouble("Temperature")));
pressure.getData().add(new XYChart.Data<>(rs.getInt("Year_1"), rs.getDouble("Pressure")));
humidity.getData().add(new XYChart.Data<>(rs.getInt("Year_1"), rs.getDouble("Humidity")));
}
//answer.addAll(Temperature, Pressure, Humidity);
areaChart.getData().addAll(temperature, pressure, humidity);
}
请帮我解决这个查询。 当我运行应用它表明这个错误
Exception in thread "JavaFX Application Thread" java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
at javafx.scene.chart.CategoryAxis.calculateRequiredSize(CategoryAxis.java:378)
at javafx.scene.chart.CategoryAxis.autoRange(CategoryAxis.java:363)
at javafx.scene.chart.Axis.computePrefHeight(Axis.java:577)
at javafx.scene.Parent.prefHeight(Parent.java:924)
at javafx.scene.layout.Region.prefHeight(Region.java:1435)
at javafx.scene.chart.XYChart.layoutChartChildren(XYChart.java:687)
at javafx.scene.chart.Chart$1.layoutChildren(Chart.java:94)
at javafx.scene.Parent.layout(Parent.java:1076)
at javafx.scene.Parent.layout(Parent.java:1082)
at javafx.scene.Parent.layout(Parent.java:1082)
at javafx.scene.Parent.layout(Parent.java:1082)
at javafx.scene.Parent.layout(Parent.java:1082)
at javafx.scene.Parent.layout(Parent.java:1082)
at javafx.scene.Scene.doLayoutPass(Scene.java:552)
at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2397)
at com.sun.javafx.tk.Toolkit.lambda$runPulse$30(Toolkit.java:314)
at com.sun.javafx.tk.Toolkit$$Lambda$151/250776792.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:313)
at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:340)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:525)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:505)
at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$400(QuantumToolkit.java:334)
at com.sun.javafx.tk.quantum.QuantumToolkit$$Lambda$42/1119034921.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$145(WinApplication.java:101)
at com.sun.glass.ui.win.WinApplication$$Lambda$38/636526176.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
请添加行号，或导致错误高亮线。 –
没有高光线。其中显示错误 –