我有一个jtable设置，我已经填充了.csv文件中的值。我需要从jtable中检索所有值并绘制它们，但是我很难搞清楚它。我使用了JFreeChart并设置了图表，但绝对坚持如何使用JTable中的值填充折线图。
我尝试过的代码，但是当我按下图表按钮时，它还没有工作，只是暂停了应用程序：
//instantiate the data series and the chart
int row = tableRadio.getRowCount();
int column = tableRadio.getColumnCount();
for (int r = 0; r < row; r++) {
for (int c = 0; c < column; c++) {
series.add(r, c);
}
}
整个代码：
//data used by all methods
DefaultTableModel tableModel;
//Global variables
XYSeries series; //series of data that will be added to the graph
XYSeriesCollection dataSet; //a collection object holds the series
JFreeChart chart; //chart to be placed on the panel
public MainWindow() {
initComponents();
//instantiate the DefaultTableModel
tableModel = (DefaultTableModel) tableRadio.getModel();
//instantiate the data series and the chart
series = new XYSeries("Random Numbers");
dataSet = new XYSeriesCollection(series);
chart = ChartFactory.createXYLineChart("Radio Astronomy Graphing", "Time", "Sensor Value", dataSet);
//display the graphing chart on the panel
panelGraph.add(new ChartPanel(chart), BorderLayout.CENTER);
panelGraph.revalidate();
//center the applications window upon start
this.setLocationRelativeTo(null);
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
buttonLoad = new javax.swing.JButton();
buttonGraph = new javax.swing.JButton();
buttonSave = new javax.swing.JButton();
buttonAdd = new javax.swing.JButton();
buttonEdit = new javax.swing.JButton();
buttonRemove = new javax.swing.JButton();
labelValue = new javax.swing.JLabel();
tfMonth = new javax.swing.JTextField();
tfValue = new javax.swing.JTextField();
tfDay = new javax.swing.JTextField();
labelHour = new javax.swing.JLabel();
labelMin = new javax.swing.JLabel();
labelYear = new javax.swing.JLabel();
labelDay = new javax.swing.JLabel();
labelMonth = new javax.swing.JLabel();
tfYear = new javax.swing.JTextField();
tfHour = new javax.swing.JTextField();
tfMin = new javax.swing.JTextField();
panelGraph = new javax.swing.JPanel();
jScrollPane1 = new javax.swing.JScrollPane();
tableRadio = new javax.swing.JTable();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
buttonLoad.setText("Load File");
buttonLoad.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
buttonLoadActionPerformed(evt);
}
});
buttonGraph.setText("Graph Data");
buttonGraph.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
buttonGraphActionPerformed(evt);
}
});
buttonSave.setText("Save");
buttonSave.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
buttonSaveActionPerformed(evt);
}
});
buttonAdd.setText("Add");
buttonAdd.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
buttonAddActionPerformed(evt);
}
});
buttonEdit.setText("Edit");
buttonEdit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
buttonEditActionPerformed(evt);
}
});
buttonRemove.setText("Remove");
buttonRemove.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
buttonRemoveActionPerformed(evt);
}
});
labelValue.setText("Sensor Value:");
tfValue.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
tfValueActionPerformed(evt);
}
});
labelHour.setText("Hour");
labelMin.setText("Minute");
labelYear.setText("Year");
labelDay.setText("Day");
labelMonth.setText("Month");
panelGraph.setLayout(new java.awt.BorderLayout());
tableRadio.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
},
new String [] {
"Date and Time", "Sensor Value"
}
) {
boolean[] canEdit = new boolean [] {
false, false
};
public boolean isCellEditable(int rowIndex, int columnIndex) {
return canEdit [columnIndex];
}
});
jScrollPane1.setViewportView(tableRadio);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(41, 41, 41)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(buttonLoad, javax.swing.GroupLayout.PREFERRED_SIZE, 87, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(buttonSave, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 87, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(buttonGraph, javax.swing.GroupLayout.Alignment.TRAILING))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addComponent(buttonAdd, javax.swing.GroupLayout.PREFERRED_SIZE, 87, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(84, 84, 84)
.addComponent(labelMonth)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(tfMonth, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(labelDay)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(tfDay, javax.swing.GroupLayout.PREFERRED_SIZE, 41, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(buttonEdit, javax.swing.GroupLayout.PREFERRED_SIZE, 87, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(buttonRemove, javax.swing.GroupLayout.PREFERRED_SIZE, 87, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(87, 87, 87)))
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(labelValue)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(tfValue, javax.swing.GroupLayout.PREFERRED_SIZE, 82, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addComponent(labelHour)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(tfHour, javax.swing.GroupLayout.PREFERRED_SIZE, 46, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(15, 15, 15)
.addComponent(labelMin)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(tfMin, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)))))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(labelYear)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(tfYear, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 372, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(panelGraph, javax.swing.GroupLayout.PREFERRED_SIZE, 382, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(0, 17, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(panelGraph, javax.swing.GroupLayout.PREFERRED_SIZE, 230, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 230, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(42, 42, 42)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(buttonLoad)
.addComponent(buttonAdd)
.addComponent(labelMonth)
.addComponent(tfMonth, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(labelDay)
.addComponent(tfDay, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(labelYear)
.addComponent(tfYear, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(buttonGraph)
.addComponent(buttonEdit)
.addComponent(tfHour, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(labelHour)
.addComponent(labelMin)
.addComponent(tfMin, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(buttonSave)
.addComponent(buttonRemove)
.addComponent(labelValue)
.addComponent(tfValue, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(35, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void buttonLoadActionPerformed(java.awt.event.ActionEvent evt) {
//Load file into table
//create JFileChooser
JFileChooser fileChooser = new JFileChooser();
fileChooser.showOpenDialog(null);
//create myFile and define the path
File myFile = fileChooser.getSelectedFile();
try{
//instantiate Scanner
Scanner inputStream = new Scanner(myFile);
for(int i=0; i < 12; i++){
inputStream.nextLine();
}
//split values into 2 arrays and insert into table
while (inputStream.hasNext()) {
String data = inputStream.next();
String[] values = data.split(",");
tableModel.insertRow(tableModel.getRowCount(), values);
}//end of while block
}//end of try block
catch(FileNotFoundException e) {
JOptionPane.showMessageDialog(this, "File Not Found");
}//end of catch block
}
private void buttonAddActionPerformed(java.awt.event.ActionEvent evt) {
//add info from text fields and combo boxes to table
try {
//create variables to hold the contents of what user has typed in
int Month = Integer.parseInt(tfMonth.getText());
int Day = Integer.parseInt(tfDay.getText());
int Year = Integer.parseInt(tfYear.getText());
int Hour = Integer.parseInt(tfHour.getText());
int Min = Integer.parseInt(tfMin.getText());
double Value = Double.parseDouble(tfValue.getText());
//add the info to the table
tableModel.insertRow(tableModel.getRowCount(), new Object[]{Month + "/" + Day + "/" + Year + " " + Hour + ":" + Min, Value });
//clear the controls on the interface
tfMonth.setText("");
tfDay.setText("");
tfYear.setText("");
tfHour.setText("");
tfMin.setText("");
tfValue.setText("");
}//end of try block
catch(NumberFormatException e) {
JOptionPane.showMessageDialog(this, "Please fill out all fields and enter only numbers");
}//end of catch block
}
private void buttonEditActionPerformed(java.awt.event.ActionEvent evt) {
//edit info based on row selected
//make sure a row is selected
if(tableRadio.getSelectedRow() >= 0){
//set the values in the table for all text fields
tableModel.setValueAt(tfMonth.getText() + "/" + tfDay.getText() + "/" + tfYear.getText() + " " + tfHour.getText() + ":" + tfMin.getText(), tableRadio.getSelectedRow(), 0);
tableModel.setValueAt(tfValue.getText(), tableRadio.getSelectedRow(), 1);
//clear the user interface controls after adding them to the table
tfMonth.setText("");
tfDay.setText("");
tfYear.setText("");
tfHour.setText("");
tfMin.setText("");
tfValue.setText("");
}//end of if block checking for selected row
else{
JOptionPane.showMessageDialog(this, "Please select a row.");
}//end of else block
}
private void buttonRemoveActionPerformed(java.awt.event.ActionEvent evt) {
//Delete the selected row
//Make sure a row is selected
if(tableRadio.getSelectedRow() >= 0){
//remove the row
tableModel.removeRow(tableRadio.getSelectedRow());
//clear the user interface controls after deleting a row
tfMonth.setText("");
tfDay.setText("");
tfYear.setText("");
tfHour.setText("");
tfMin.setText("");
tfValue.setText("");
}//end of if block
else{
JOptionPane.showMessageDialog(this, "Please select a row.");
}//end of else block
}
private void buttonGraphActionPerformed(java.awt.event.ActionEvent evt) {
//instantiate the data series and the chart
int row = tableRadio.getRowCount();
int column = tableRadio.getColumnCount();
for (int r = 0; r < row; r++) {
for (int c = 0; c < column; c++) {
series.add(r, c);
}
}
}
private void tfValueActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void buttonSaveActionPerformed(java.awt.event.ActionEvent evt) {
try {
// capture the whole screen
BufferedImage radioGraph = new Robot().createScreenCapture(
new Rectangle( panelGraph.getX(), panelGraph.getY(), panelGraph.getWidth(), panelGraph.getHeight() ) );
//Save as PNG
File file = new File("radioGraph.png");
ImageIO.write(radioGraph, "png", file);
JOptionPane.showMessageDialog(this, "radioGraph.png added to project folder");
}
catch(AWTException e) {
JOptionPane.showMessageDialog(this, "Error");
}
catch(IOException e){
JOptionPane.showMessageDialog(this, "Error");
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new MainWindow().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton buttonAdd;
private javax.swing.JButton buttonEdit;
private javax.swing.JButton buttonGraph;
private javax.swing.JButton buttonLoad;
private javax.swing.JButton buttonRemove;
private javax.swing.JButton buttonSave;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JLabel labelDay;
private javax.swing.JLabel labelHour;
private javax.swing.JLabel labelMin;
private javax.swing.JLabel labelMonth;
private javax.swing.JLabel labelValue;
private javax.swing.JLabel labelYear;
private javax.swing.JPanel panelGraph;
private javax.swing.JTable tableRadio;
private javax.swing.JTextField tfDay;
private javax.swing.JTextField tfHour;
private javax.swing.JTextField tfMin;
private javax.swing.JTextField tfMonth;
private javax.swing.JTextField tfValue;
private javax.swing.JTextField tfYear;
// End of variables declaration
关于什么对我有用的任何想法？我从来没有必要从表中获取数据并绘制图表，所以这对我来说都是新的。如果我搞砸了某个地方，请告诉我。
答案 0 :(得分：2)
series.add(r, c);
那不会做任何事情。你只是得到循环的索引。
你想要这样的东西：
series.add( tableRadio.getValueAt(r, c) );
当然getValueAt(...)方法只返回一个Object，因此您需要将Object转换为系列Object所需的数据类型。
此外，如果您需要系列对象的两个参数，那么您显然需要两个getValueAt(...)语句。也许你只有两列，所以你只需要在行上有一个循环，然后从第0列和第1列获得值？只有您知道表格中的数据。