我在 java 中制作了一个 JTable。 除了在表格中搜索元素之外，我什么都能做。 我想工作一个输入对话框，所以这就是我现在所拥有的：
btnSearch = new JButton("Search");
btnSearch.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String name = JOptionPane.showInputDialog("Wat wil je zoeken?");
}
});
add(btnSearch);
我想用 for 循环来做。 但我不知道怎么做。 有人可以帮我吗？
【问题讨论】：
您可能希望使用RowFilter 来过滤搜索结果。下面是使用RowFilter 和DocumentListener 的示例。当用户键入时，动态过滤行。
参见RowFilter api 和DocumentListener api。如果您不喜欢动态过滤，您可以直接使用按钮，或者您可以在JTextField 中添加一个ActionListener，这样当按下 Enter 时，过滤器将处理.您将在侦听器回调 (actionPerformed) 中放入的代码将是
String text = jtfFilter.getText();
if (text.trim().length() == 0) {
rowSorter.setRowFilter(null);
} else {
rowSorter.setRowFilter(RowFilter.regexFilter("(?i)" + text));
}
import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.RowFilter;
import javax.swing.SwingUtilities;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
import javax.swing.table.TableRowSorter;
public class TestTableSortFilter extends JPanel {
private String[] columnNames
= {"Country", "Capital", "Population in Millions", "Democracy"};
private Object[][] data = {
{"USA", "Washington DC", 280, true},
{"Canada", "Ottawa", 32, true},
{"United Kingdom", "London", 60, true},
{"Germany", "Berlin", 83, true},
{"France", "Paris", 60, true},
{"Norway", "Oslo", 4.5, true},
{"India", "New Delhi", 1046, true}
};
private DefaultTableModel model = new DefaultTableModel(data, columnNames);
private JTable jTable = new JTable(model);
private TableRowSorter<TableModel> rowSorter
= new TableRowSorter<>(jTable.getModel());
private JTextField jtfFilter = new JTextField();
private JButton jbtFilter = new JButton("Filter");
public TestTableSortFilter() {
jTable.setRowSorter(rowSorter);
JPanel panel = new JPanel(new BorderLayout());
panel.add(new JLabel("Specify a word to match:"),
BorderLayout.WEST);
panel.add(jtfFilter, BorderLayout.CENTER);
setLayout(new BorderLayout());
add(panel, BorderLayout.SOUTH);
add(new JScrollPane(jTable), BorderLayout.CENTER);
jtfFilter.getDocument().addDocumentListener(new DocumentListener(){
@Override
public void insertUpdate(DocumentEvent e) {
String text = jtfFilter.getText();
if (text.trim().length() == 0) {
rowSorter.setRowFilter(null);
} else {
rowSorter.setRowFilter(RowFilter.regexFilter("(?i)" + text));
}
}
@Override
public void removeUpdate(DocumentEvent e) {
String text = jtfFilter.getText();
if (text.trim().length() == 0) {
rowSorter.setRowFilter(null);
} else {
rowSorter.setRowFilter(RowFilter.regexFilter("(?i)" + text));
}
}
@Override
public void changedUpdate(DocumentEvent e) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
});
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
public void run() {
JFrame frame = new JFrame("Row Filter");
frame.add(new TestTableSortFilter());
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
【讨论】：
JTable 的模型是保存数据的地方，通过搜索它你应该能够检查它是否包含你想要的 ：
for(int i = 0; i < table.getRowCount(); i++){//For each row
for(int j = 0; j < table.getColumnCount(); j++){//For each column in that row
if(table.getModel().getValueAt(i, j).equals("STRING_TO_SEARCH")){//Search the model
System.out.println(table.getModel().getValueAt(i, j));//Print if found string
}
}//For loop inner
}//For loop outer
祝你好运！
【讨论】：
下面是从JTable 中搜索文本的示例，输入到JTextField
来源：Filter table by the text in a TextField
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.RowFilter;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
import javax.swing.table.TableRowSorter;
public class RegexTable {
public static void main(String args[]) {
JFrame frame = new JFrame("Regexing JTable");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Object rows[][] = { { "A", "About", 44.36 }, { "B", "Boy", 44.84 }, { "C", "Cat", 463.63 },
{ "D", "Day", 27.14 }, { "E", "Eat", 44.57 }, { "F", "Fail", 23.15 },
{ "G", "Good", 4.40 }, { "H", "Hot", 24.96 }, { "I", "Ivey", 5.45 },
{ "J", "Jack", 49.54 }, { "K", "Kids", 280.00 } };
String columns[] = { "Symbol", "Name", "Price" };
TableModel model = new DefaultTableModel(rows, columns) {
public Class getColumnClass(int column) {
Class returnValue;
if ((column >= 0) && (column < getColumnCount())) {
returnValue = getValueAt(0, column).getClass();
} else {
returnValue = Object.class;
}
return returnValue;
}
};
final JTable table = new JTable(model);
final TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(model);
table.setRowSorter(sorter);
JScrollPane pane = new JScrollPane(table);
frame.add(pane, BorderLayout.CENTER);
JPanel panel = new JPanel(new BorderLayout());
JLabel label = new JLabel("Filter");
panel.add(label, BorderLayout.WEST);
final JTextField filterText = new JTextField("A");
panel.add(filterText, BorderLayout.CENTER);
frame.add(panel, BorderLayout.NORTH);
JButton button = new JButton("Filter");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String text = filterText.getText();
if (text.length() == 0) {
sorter.setRowFilter(null);
} else {
sorter.setRowFilter(RowFilter.regexFilter(text));
}
}
});
frame.add(button, BorderLayout.SOUTH);
frame.setSize(300, 250);
frame.setVisible(true);
}
}
【讨论】：
只是一个注释 如果您在排序后获取值，这将导致原始行索引。 （这将是错误的对象） 在这种情况下，您可以使用：JTable API
table.convertRowIndexToModel (int indexAfterSorting) ;
这会将排序后的行索引转换为原始行
【讨论】：