我正在制作一个Java程序 - 一个数据库旅游机构。我已经把它从文件加载到表中的位置，你可以添加新信息并保存它，你可以计算平均价格，你可以编辑表中的信息并将其保存到文件中，但这是我得到的点问题。
编辑表时的表监听器。
jTable1.getModel().addTableModelListener(new TableModelListener() {
public void tableChanged(TableModelEvent e) {
try {
saveTable();
} catch (Exception e1) {
e1.printStackTrace();
}
}
});
保存表格功能
public void saveTable()throws Exception
{
StringBuffer fileContent = new StringBuffer();
TableModel tModel = jTable1.getModel();
for (int row = 0; row < jTable1.getRowCount(); row++) {
for (int col = 0; col < jTable1.getColumnCount(); col++) {
Object cellValue = tModel.getValueAt(row, col) + ", ";
fileContent.append(cellValue);
}
fileContent.append("\n");
}
FileWriter fileWriter = new FileWriter(new File("/home/nauris/Desktop/mydata.txt"));
fileWriter.write(fileContent.toString());
fileWriter.flush();
fileWriter.close();
}
加载表格功能
public void loadTable()throws Exception
{
DefaultTableModel model = (DefaultTableModel) jTable1.getModel();
model.setRowCount(0);
BufferedReader br;
try {
br = new BufferedReader(new FileReader("/home/nauris/Desktop/mydata.txt"));
String line = br.readLine();
while (line != null ) {
model.addRow(line.split(", "));
line = br.readLine();
}
} catch (FileNotFoundException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
}
}
第二件事是，我需要搜索价格较低的行，然后我放入文本字段。
JTextField searchField = new JTextField();
searchField.setPreferredSize(new Dimension(50, 24));
buttonPanel.add(searchField, gbc);
JButton searchButton = new JButton("Atrast");
buttonPanel.add(searchButton, gbc);
DefaultTableModel model = (DefaultTableModel) jTable1.getModel();
searchButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int text = Integer.parseInt(searchField.getText());
if (String.valueOf(text) == null) {
//sorter.setRowFilter(null);
} else {
int rowsCount = jTable1.getRowCount();
int value= 0;
for(int i = 0; i < rowsCount; i++){
value = Integer.parseInt(jTable1.getValueAt(i, 3).toString());
if(value<text) {
model.removeRow(i);
}
}
}
}
});
但它给了我错误
Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Invalid index
答案 0 :(得分：0)
从上面给出的代码中，您尝试根据搜索值过滤行。如果您使用RowFilter而不是从模型中删除行，那会更好。
TableRowSorter<DefaultTableModel> sorter = new TableRowSorter<DefaultTableModel>(model);
RowFilter<DefaultTableModel, Integer> rf = RowFilter.numberFilter(RowFilter.ComparisonType.BEFORE, searchValue, 0);
sorter.setRowFilter(rf);
编辑12月5日
我已经提供了完整的代码清单。它按预期工作。
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package testtable;
import javax.swing.RowFilter;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableRowSorter;
/**
*
* @author user
*/
public class MyFrame extends javax.swing.JFrame {
private DefaultTableModel model = null;
TableRowSorter<DefaultTableModel> sorter = null;
/**
* Creates new form MyFrame
*/
public MyFrame() {
initComponents();
model = new DefaultTableModel(null, new String[]{
"Name", "age", "salary"
});
jTable1.setModel(model);
model.addRow(new Object[]{"Beniton", 34, 10000});
model.addRow(new Object[]{"Joema", 33, 10000});
sorter = new TableRowSorter<DefaultTableModel>(model);
jTable1.setRowSorter(sorter);
}
/**
* 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() {
java.awt.GridBagConstraints gridBagConstraints;
jLabel1 = new javax.swing.JLabel();
searchBox = new javax.swing.JTextField();
jScrollPane2 = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
getContentPane().setLayout(new java.awt.GridBagLayout());
jLabel1.setText("Search");
getContentPane().add(jLabel1, new java.awt.GridBagConstraints());
searchBox.setMaximumSize(new java.awt.Dimension(150, 20));
searchBox.setMinimumSize(new java.awt.Dimension(150, 20));
searchBox.setName("searchField"); // NOI18N
searchBox.setPreferredSize(new java.awt.Dimension(150, 20));
searchBox.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
searchBoxActionPerformed(evt);
}
});
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 1;
gridBagConstraints.gridy = 0;
gridBagConstraints.anchor = java.awt.GridBagConstraints.WEST;
gridBagConstraints.weightx = 1.0;
gridBagConstraints.insets = new java.awt.Insets(4, 4, 4, 4);
getContentPane().add(searchBox, gridBagConstraints);
searchBox.getAccessibleContext().setAccessibleName("");
jTable1.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null}
},
new String [] {
"Title 1", "Title 2", "Title 3", "Title 4"
}
));
jScrollPane2.setViewportView(jTable1);
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 1;
gridBagConstraints.gridwidth = 2;
gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
gridBagConstraints.weightx = 1.0;
gridBagConstraints.weighty = 1.0;
getContentPane().add(jScrollPane2, gridBagConstraints);
pack();
}// </editor-fold>
private void searchBoxActionPerformed(java.awt.event.ActionEvent evt) {
if (searchBox.getText().length() > 0) {
Integer value = Integer.parseInt(searchBox.getText());
// Checking the age as Index is 1
RowFilter<DefaultTableModel, Integer> rf = RowFilter.numberFilter(RowFilter.ComparisonType.BEFORE, value, 1);
sorter.setRowFilter(rf);
} else {
sorter.setRowFilter(null);
}
}
/**
* @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(MyFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(MyFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(MyFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(MyFrame.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 MyFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTable jTable1;
private javax.swing.JTextField searchBox;
// End of variables declaration
}