如何对JScrollPane里的输入进行正则表达式验证，不符合则不让输入

Question

达人们，我这里有一个 JScrollPane，有 3列 variable, value, time, 全是 string 类型.不过要求手工对 value 的输入必须是浮点类型的，否则的话连非法输入都不让显示。程序里对 value 的修改可以不受这个条件限制，可以修改为非浮点型的字符串。请问该如何实现？十分感谢！我写好的代码：GlobalVari_5.java
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Vector;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.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;public class GlobalVari_5 extends JFrame{
private static final long serialVersionUID = 1L;

private static double select = 0;
private static int rowIndex = 0; //  /表格方法使用  
public GlobalVari_5(){
init(); this.setTitle("Global Variables");
this.setSize(new Dimension(650, 400));
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
this.setVisible(true);
//this.setLayout(null);
this.setResizable(false);
} private void init(){
Vector<String> colHeader = new Vector<String>();
colHeader.add("Variable");
colHeader.add("Value");
colHeader.add("Time"); Vector<Vector<String>> dataVec = new Vector<Vector<String>>(); final JTable table = new JTable(dataVec,colHeader){
private static final long serialVersionUID = 1L; public boolean isCellEditable(int row, int column){
if(column > 1){
return false;
} else {
return true;
}
}
}; //2设置表头行高  
table.getTableHeader().setPreferredSize(new Dimension(0,30));  
//3设置表内容行高  
table.setRowHeight(25);  
//4设置单选模式  
table.getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_SELECTION);  
//5设置单元格不可拖动  
table.getTableHeader().setReorderingAllowed(false);  
//6设置不可改变列宽  
table.getTableHeader().setResizingAllowed(false);
//7设置列宽  
table.getColumnModel().getColumn(0).setPreferredWidth(95);
table.getColumnModel().getColumn(1).setPreferredWidth(55);  
table.getColumnModel().getColumn(2).setPreferredWidth(30);
//注意索引越界 DefaultTableCellRenderer right = new DefaultTableCellRenderer();
right.setHorizontalAlignment(JLabel.RIGHT);
table.getColumnModel().getColumn(1).setCellRenderer(right); 
table.getColumnModel().getColumn(2).setCellRenderer(right);

final JButton buttonAdd = new JButton("Add");
final JButton buttonDel = new JButton("Delete");
final JButton buttonCls = new JButton("Close");

rowIndex = table.getSelectedRow();  
System.out.println("index:"+rowIndex);  
//监听事件  
table.getSelectionModel().addListSelectionListener(new ListSelectionListener(){  
public void valueChanged(ListSelectionEvent e){
if(e.getValueIsAdjusting()){//连续操作  
rowIndex = table.getSelectedRow();  
if(rowIndex != -1){  
System.out.println("表格行被选中"+rowIndex); 
buttonDel.setEnabled(true); 
select = 1;
}                     
}
}
}); JScrollPane scrollPane = new JScrollPane(); 
scrollPane.setViewportView(table);
//this.add(scrollPane,BorderLayout.WEST);
this.add(scrollPane);
scrollPane.setSize(515, 350);
scrollPane.setLocation(5, 5); buttonAdd.setEnabled(true);
buttonDel.setEnabled(false);
buttonCls.setEnabled(true); JPanel panel = new JPanel();
panel.setSize(10, 350);
panel.setLocation(520, 5);
//this.add(panel, BorderLayout.EAST);
this.add(panel);

panel.setLayout(null);
panel.add(buttonAdd);
buttonAdd.setSize(100, 30);
buttonAdd.setLocation(530, 6);
panel.add(buttonDel);
buttonDel.setSize(100, 30);
buttonDel.setLocation(530, 50);
panel.add(buttonCls);
buttonCls.setSize(100, 30);
buttonCls.setLocation(530, 322); buttonAdd.addMouseListener(new MouseListener(){
public void mouseClicked(MouseEvent e){
DefaultTableModel model = (DefaultTableModel)table.getModel();
int rownum = table.getRowCount() + 1;
model.addRow(new Object[]{"gvar" + rownum, "", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date())});
} public void mousePressed(MouseEvent e){
} public void mouseReleased(MouseEvent e){
} public void mouseEntered(MouseEvent e){
} public void mouseExited(MouseEvent e){
}
}); buttonDel.addMouseListener(new MouseListener(){
public void mouseClicked(MouseEvent e){
if(select == 1){
DefaultTableModel model = (DefaultTableModel)table.getModel();
model.removeRow(rowIndex);
select = 0;
buttonDel.setEnabled(false);
}
} public void mousePressed(MouseEvent e){
} public void mouseReleased(MouseEvent e){
} public void mouseEntered(MouseEvent e){
} public void mouseExited(MouseEvent e){
}
});

buttonCls.addMouseListener(new MouseListener(){
public void mouseClicked(MouseEvent e){
setVisible(false);
} public void mousePressed(MouseEvent e){
} public void mouseReleased(MouseEvent e){
} public void mouseEntered(MouseEvent e){
} public void mouseExited(MouseEvent e){
}
});
}   public static void main(String[] args){
new GlobalVari_5();
}
}

Answer 1

还有一个小问题，虽然我已经设定了 value列的显示是靠右，但是手动输入的时候，光标和已输入的内容（如果有的话）会移动到左边来。这个有没有办法让在手动输入的时候，value列的内容和光标都还是保持在右边呢？十分感谢！

Answer 2

java 高手们, 给点力呀！Thanks!

Answer 3

正则写在表格单元的.lostfocus()里！
手工输入肯定要设置到焦点，失去焦点时就会调用该方法，从而正则检验
而程序修改时不用设置焦点的，也就不会调用到该方法。
应该是你想要的吧

Answer 4

重写cellreader继承JTextField
然后在plainDocument对象的insertString方法中验证即可具体你可以google，大致思路就是这样！

Answer 5

看看是不是你想要的。
import java.awt.Dimension;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Vector;import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;public class GlobalVari_5 extends JFrame{
    private static final long serialVersionUID = 1L;
    
    private static double select = 0;
    private static int rowIndex = 0;    //  /表格方法使用  
    public GlobalVari_5(){
        init();        this.setTitle("Global Variables");
        this.setSize(new Dimension(650, 400));
        this.setLocationRelativeTo(null);
        this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        this.setVisible(true);
        //this.setLayout(null);
        this.setResizable(false);
    }    private void init(){
        Vector<String> colHeader = new Vector<String>();
        colHeader.add("Variable");
        colHeader.add("Value");
        colHeader.add("Time");        Vector<Vector<String>> dataVec = new Vector<Vector<String>>();        final JTable table = new JTable(dataVec,colHeader){
            private static final long serialVersionUID = 1L;            public boolean isCellEditable(int row, int column){
                if(column > 1){
                    return false;
                } else {
                    return true;
                }
            }
            public void editingStopped(ChangeEvent ce) {
super.editingStopped(ce);
int row = getSelectedRow();
int col = getSelectedColumn();
if (row < 0 || col < 0) {
return;
} Object value = getValueAt(row, col);
System.out.println(row + "," + col + ":" + value);
// 检查是不是浮点数
try {
Double.parseDouble((String) value);
} catch (Exception e) {
// 不是浮点
setValueAt("", row, col);
JOptionPane.showMessageDialog(this.getParent(), value
+ "不是浮点数！", "错误", JOptionPane.ERROR_MESSAGE);
}
} };        //2设置表头行高  
        table.getTableHeader().setPreferredSize(new Dimension(0,30));  
        //3设置表内容行高  
        table.setRowHeight(25);  
        //4设置单选模式  
        table.getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_SELECTION);  
        //5设置单元格不可拖动  
        table.getTableHeader().setReorderingAllowed(false);  
        //6设置不可改变列宽  
        table.getTableHeader().setResizingAllowed(false);
        //7设置列宽  
        table.getColumnModel().getColumn(0).setPreferredWidth(95);
        table.getColumnModel().getColumn(1).setPreferredWidth(55);  
        table.getColumnModel().getColumn(2).setPreferredWidth(30);    
        //注意索引越界        DefaultTableCellRenderer right = new DefaultTableCellRenderer();
        right.setHorizontalAlignment(JLabel.RIGHT);
        table.getColumnModel().getColumn(1).setCellRenderer(right); 
        table.getColumnModel().getColumn(2).setCellRenderer(right);
                
        final JButton buttonAdd = new JButton("Add");
        final JButton buttonDel = new JButton("Delete");
        final JButton buttonCls = new JButton("Close");
        
        rowIndex = table.getSelectedRow();  
        System.out.println("index:"+rowIndex);  
        //监听事件  
        table.getSelectionModel().addListSelectionListener(new ListSelectionListener(){  
            public void valueChanged(ListSelectionEvent e){
                if(e.getValueIsAdjusting()){//连续操作  
                    rowIndex = table.getSelectedRow();  
                    if(rowIndex != -1){  
                        System.out.println("表格行被选中"+rowIndex); 
                        buttonDel.setEnabled(true); 
                        select = 1;
                    }                     
                }
            }
        });        JScrollPane scrollPane = new JScrollPane(); 
        scrollPane.setViewportView(table);
        //this.add(scrollPane,BorderLayout.WEST);
        this.add(scrollPane);
        scrollPane.setSize(515, 350);
        scrollPane.setLocation(5, 5);        buttonAdd.setEnabled(true);
        buttonDel.setEnabled(false);
        buttonCls.setEnabled(true);        JPanel panel = new JPanel();
        panel.setSize(10, 350);
        panel.setLocation(520, 5);
        //this.add(panel, BorderLayout.EAST);
        this.add(panel);
        
        panel.setLayout(null);
        panel.add(buttonAdd);
        buttonAdd.setSize(100, 30);
        buttonAdd.setLocation(530, 6);
        panel.add(buttonDel);
        buttonDel.setSize(100, 30);
        buttonDel.setLocation(530, 50);
        panel.add(buttonCls);
        buttonCls.setSize(100, 30);
        buttonCls.setLocation(530, 322);                buttonAdd.addMouseListener(new MouseListener(){
            public void mouseClicked(MouseEvent e){
                DefaultTableModel model = (DefaultTableModel)table.getModel();
                int rownum = table.getRowCount() + 1;
                model.addRow(new Object[]{"gvar" + rownum, "", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date())});
            }            public void mousePressed(MouseEvent e){
            }            public void mouseReleased(MouseEvent e){
            }            public void mouseEntered(MouseEvent e){
            }            public void mouseExited(MouseEvent e){
            }
        });        buttonDel.addMouseListener(new MouseListener(){
            public void mouseClicked(MouseEvent e){
                if(select == 1){
                    DefaultTableModel model = (DefaultTableModel)table.getModel();
                    model.removeRow(rowIndex);
                    select = 0;                    
                    buttonDel.setEnabled(false);
                }
            }            public void mousePressed(MouseEvent e){
            }            public void mouseReleased(MouseEvent e){
            }            public void mouseEntered(MouseEvent e){
            }            public void mouseExited(MouseEvent e){
            }
        });
        
        buttonCls.addMouseListener(new MouseListener(){
            public void mouseClicked(MouseEvent e){
                setVisible(false);
            }            public void mousePressed(MouseEvent e){
            }            public void mouseReleased(MouseEvent e){
            }            public void mouseEntered(MouseEvent e){
            }            public void mouseExited(MouseEvent e){
            }
        });
    }      public static void main(String[] args){
        new GlobalVari_5();
    }
}

Answer 6

主要在你的JTable加了这段。public void editingStopped(ChangeEvent ce) {
                super.editingStopped(ce);
                int row = getSelectedRow();
                int col = getSelectedColumn();
                if (row < 0 || col < 0) {
                    return;
                }                Object value = getValueAt(row, col);
                System.out.println(row + "," + col + ":" + value);
                // 检查是不是浮点数
                try {
                    Double.parseDouble((String) value);
                } catch (Exception e) {
                    // 不是浮点
                    setValueAt("", row, col);
                    JOptionPane.showMessageDialog(this.getParent(), value
                            + "不是浮点数！", "错误", JOptionPane.ERROR_MESSAGE);
                }
            }

Answer 7

还有楼主要求value是浮点数，如果不包括整形数的话，验证部分请百度查下，重写。
注意：正负号。

Answer 8

scbb， 这个确实是做到了验证是不是浮点数。不过，我希望能做得更干脆些，用户想要输入字母，特殊字符都直接输不进去。而不是输进去后再判断给出提示。这个可以做到么？

Answer 9

这样可以。你看看。import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Vector;import javax.swing.DefaultCellEditor;
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.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.PlainDocument;public class GlobalVari_5 extends JFrame{
    private static final long serialVersionUID = 1L;
    
    private static double select = 0;
    private static int rowIndex = 0;    //  /表格方法使用  
    public GlobalVari_5(){
        init();        this.setTitle("Global Variables");
        this.setSize(new Dimension(650, 400));
        this.setLocationRelativeTo(null);
        this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        this.setVisible(true);
        //this.setLayout(null);
        this.setResizable(false);
    }    private void init(){
        Vector<String> colHeader = new Vector<String>();
        colHeader.add("Variable");
        colHeader.add("Value");
        colHeader.add("Time");        Vector<Vector<String>> dataVec = new Vector<Vector<String>>();        final JTable table = new JTable(dataVec,colHeader){
            private static final long serialVersionUID = 1L;            public boolean isCellEditable(int row, int column){
                if(column > 1){
                    return false;
                } else {
                    return true;
                }
            }
        };
        //把Value列设为只能输入浮点数
        TableColumn column = table.getColumnModel().getColumn(1);
        JTextField textField = new JTextField();
        textField.setDocument(new DoubleDocument());
        column.setCellEditor(new DefaultCellEditor(textField));
                
        //2设置表头行高  
        table.getTableHeader().setPreferredSize(new Dimension(0,30));  
        //3设置表内容行高  
        table.setRowHeight(25);  
        //4设置单选模式  
        table.getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_SELECTION);  
        //5设置单元格不可拖动  
        table.getTableHeader().setReorderingAllowed(false);  
        //6设置不可改变列宽  
        table.getTableHeader().setResizingAllowed(false);
        //7设置列宽  
        table.getColumnModel().getColumn(0).setPreferredWidth(95);
        table.getColumnModel().getColumn(1).setPreferredWidth(55);  
        table.getColumnModel().getColumn(2).setPreferredWidth(30);    
        //注意索引越界        DefaultTableCellRenderer right = new DefaultTableCellRenderer();
        right.setHorizontalAlignment(JLabel.RIGHT);
        table.getColumnModel().getColumn(1).setCellRenderer(right); 
        table.getColumnModel().getColumn(2).setCellRenderer(right);
        
        final JButton buttonAdd = new JButton("Add");
        final JButton buttonDel = new JButton("Delete");
        final JButton buttonCls = new JButton("Close");
        
        rowIndex = table.getSelectedRow();  
        System.out.println("index:"+rowIndex);  
        //监听事件  
        table.getSelectionModel().addListSelectionListener(new ListSelectionListener(){  
            public void valueChanged(ListSelectionEvent e){
                if(e.getValueIsAdjusting()){//连续操作  
                    rowIndex = table.getSelectedRow();  
                    if(rowIndex != -1){  
                        System.out.println("表格行被选中"+rowIndex); 
                        buttonDel.setEnabled(true); 
                        select = 1;
                    }                     
                }
            }
        });        JScrollPane scrollPane = new JScrollPane(); 
        scrollPane.setViewportView(table);
        //this.add(scrollPane,BorderLayout.WEST);
        this.add(scrollPane);
        scrollPane.setSize(515, 350);
        scrollPane.setLocation(5, 5);        buttonAdd.setEnabled(true);
        buttonDel.setEnabled(false);
        buttonCls.setEnabled(true);        JPanel panel = new JPanel();
        panel.setSize(10, 350);
        panel.setLocation(520, 5);
        //this.add(panel, BorderLayout.EAST);
        this.add(panel);
        
        panel.setLayout(null);
        panel.add(buttonAdd);
        buttonAdd.setSize(100, 30);
        buttonAdd.setLocation(530, 6);
        panel.add(buttonDel);
        buttonDel.setSize(100, 30);
        buttonDel.setLocation(530, 50);
        panel.add(buttonCls);
        buttonCls.setSize(100, 30);
        buttonCls.setLocation(530, 322);                buttonAdd.addMouseListener(new MouseListener(){
            public void mouseClicked(MouseEvent e){
                DefaultTableModel model = (DefaultTableModel)table.getModel();
                int rownum = table.getRowCount() + 1;
                model.addRow(new Object[]{"gvar" + rownum, "", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date())});
            }            public void mousePressed(MouseEvent e){
            }            public void mouseReleased(MouseEvent e){
            }            public void mouseEntered(MouseEvent e){
            }            public void mouseExited(MouseEvent e){
            }
        });        buttonDel.addMouseListener(new MouseListener(){
            public void mouseClicked(MouseEvent e){
                if(select == 1){
                    DefaultTableModel model = (DefaultTableModel)table.getModel();
                    model.removeRow(rowIndex);
                    select = 0;                    
                    buttonDel.setEnabled(false);
                }
            }            public void mousePressed(MouseEvent e){
            }            public void mouseReleased(MouseEvent e){
            }            public void mouseEntered(MouseEvent e){
            }            public void mouseExited(MouseEvent e){
            }
        });
        
        buttonCls.addMouseListener(new MouseListener(){
            public void mouseClicked(MouseEvent e){
                setVisible(false);
            }            public void mousePressed(MouseEvent e){
            }            public void mouseReleased(MouseEvent e){
            }            public void mouseEntered(MouseEvent e){
            }            public void mouseExited(MouseEvent e){
            }
        });
    }      public static void main(String[] args){
        new GlobalVari_5();
    }
    
class DoubleDocument extends PlainDocument {
public void insertString(int offset, String string,
AttributeSet attributeSet) throws BadLocationException {
try {
int length = getLength();
String currentContent = getText(0, length);
StringBuffer currentBuffer = new StringBuffer(currentContent);
currentBuffer.insert(offset, string);
String newValue = currentBuffer.toString();
Double.parseDouble(newValue);
} catch (Exception ex) {
Toolkit.getDefaultToolkit().beep();
return;
}
super.insertString(offset, string, attributeSet);
}
}}

Answer 10

另外使用了以下方法进行了数字检查，
由于Jdk api的设计，所以类似下面的字符都可以输入。
3.14f //表示float数
12.5D //表示double数
Double.parseDouble(newValue);
如果不合符要求，请找网上正则表达式来检查。

Answer 11

scbb，你好厉害！！！做到了哎！
那个，我还想吹毛求疵一下，虽然我已经设定了 value列的显示是靠右，但是手动输入的时候，光标和已输入的内容（如果有的话）会移动到左边来。这个有没有办法让在手动输入的时候，value列的内容和光标都还是保持在右边呢？一百分的感谢！

Answer 12

        textField.setDocument(new DoubleDocument());
        textField.setHorizontalAlignment(JTextField.RIGHT);// 这句新加一下，试试看。 
        column.setCellEditor(new DefaultCellEditor(textField));

Answer 13

scbb，太神了！
现在 value列好像还可以输入类似 0110 这样的，能在cell 失去焦点的时候把 0110 这样的变成 110 么？

Answer 14

scbb，太神了！
现在 value列好像还可以输入类似 0110 这样的，能在cell 失去焦点的时候把 0110 这样的变成 110 么？同时也把 3d 或 3f 这样的也变成 3 或 3.0?非常感谢！

Answer 15

JTable 那段下面这样改下。
final JTable table = new JTable(dataVec,colHeader){
            private static final long serialVersionUID = 1L;            public boolean isCellEditable(int row, int column){
                if(column > 1){
                    return false;
                } else {
                    return true;
                }
            }
            public void editingStopped(ChangeEvent ce) {
                super.editingStopped(ce);
                int row = getSelectedRow();
                int col = getSelectedColumn();
                if (row < 0 || col != 1) {
                    return;
                }                Object value = getValueAt(row, col);
                // 检查是不是浮点数
                try {                
                    double tempVal = Double.parseDouble((String) value);
                    setValueAt(BigDecimal.valueOf(tempVal).stripTrailingZeros(), row, col);
                } catch (Exception e) {
                    // 不是浮点
                    setValueAt("", row, col);
                    //JOptionPane.showMessageDialog(this.getParent(), value
                    //        + "不是浮点数！", "错误", JOptionPane.ERROR_MESSAGE);
                }
            }
        };

Answer 16

我确认一下，现在程序后台应该也是不能把 value列的值修改为 非浮点型的字符串的，对吧。

Answer 17

嗯，好像程序里可以修改，不过要是用户手动双击选中了 value列的那个 cell, 再把光标移开，值就会被清空。对吧。

Answer 18

好吧，结贴！多谢 scbb！！！