问题
I have a JTable where one column displays values in the following format:
423545(50),[7568787(50)],53654656,2021947(50),[021947],2021947(50),[8021947(50)]
I am wondering if it is possible to display the values within square brackets in RED?
I have been googling around for the last few days and have found several examples showing how to set the 'background' of a cell but not really how to change the font of a cell especially not a specific part of the text.
public class myTableCellRenderer
extends DefaultTableCellRenderer {
public Component getTableCellRendererComponent(JTable table,
Object value,
boolean isSelected,
boolean hasFocus,
int row,
int column) {
Component c =
super.getTableCellRendererComponent(table, value,
isSelected, hasFocus,
row, column);
if (column == 3) {
c.setForeground(Color.YELLOW);
c.setBackground(Color.RED);
}
return c;
}
Is it really possible to change part of the text to be a different color (i.e. the text that is within the square brackets).
Edit
The text i showed as an example is the actual text shown in the table cell (the comma separators are not representing columns). The text displayed in the cell is a comma separated string that i display on the table in column 3.
As an example the table could look like this
product_id |product_name| invoice_numbers
12 | Books | 423545(50),[7568787(50)],53654656,2021947(50),[021947],2021947(50),[8021947(50)]
323 | Videos | 423545(50),[7568787(50)],53654656,2021947(50),[021947],2021947(50),[8021947(50)]
4434 | Music | 423545(50),[7568787(50)],53654656,2021947(50),[021947],2021947(50),[8021947(50)]
回答1:
You must use a Cell renderer combined with HTML.
Here is a small demo example:
import java.awt.BorderLayout;
import java.awt.Component;
import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class TestTable2 {
class MyCellRenderer extends DefaultTableCellRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
Component tableCellRendererComponent = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (value instanceof String) {
String string = (String) value;
if (string.indexOf('[') > -1) {
setText(getHTML(string));
}
}
return tableCellRendererComponent;
}
private String getHTML(String string) {
StringBuilder sb = new StringBuilder();
sb.append("<html>");
int index = 0;
while (index < string.length()) {
int next = string.indexOf('[', index);
if (next > -1) {
int end = string.indexOf(']', next);
if (end > -1) {
next++;
sb.append(string.substring(index, next));
sb.append("<span style=\"color: red;\">");
sb.append(string.substring(next, end));
sb.append("</span>");
index = end;
} else {
break;
}
} else {
break;
}
}
sb.append(string.substring(index, string.length()));
sb.append("</html>");
return sb.toString();
}
}
protected void initUI() {
DefaultTableModel model = new DefaultTableModel();
for (int i = 0; i < 2; i++) {
model.addColumn("Col-" + (i + 1));
}
for (int i = 0; i < 200; i++) {
Vector<Object> row = new Vector<Object>();
for (int j = 0; j < 5; j++) {
row.add("423545(50),[7568787(50)],53654656,2021947(50),[021947],2021947(50),[8021947(50)]");
}
model.addRow(row);
}
JTable table = new JTable(model);
table.setDefaultRenderer(Object.class, new MyCellRenderer());
JFrame frame = new JFrame(TestTable2.class.getSimpleName());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JScrollPane scrollpane = new JScrollPane(table);
frame.add(scrollpane, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException,
UnsupportedLookAndFeelException {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new TestTable2().initUI();
}
});
}
}
And the result:
回答2:
Is it really possible to change part of the text to be a different color
yes is possible, for
simple highlighter is possible with
JTextField/JTextAreaasRenderers componentmultiple of the
Highlighterhave to look forJTextPaneasRenderers component(easier of ways) you can to formatting cell by using
Html(todaysJava up to Html3.2)
回答3:
This is what you are looking for Cell render
How to proceed:
get the default cell render component using
getTableCellRendererComponent()function with the appropriate parameters.parse the text of the cell and apply your formatting using
setForeground()function.
回答4:
Yes It is possible.
EDIT
First you need to create a subclass of DefaultTableCellRenderer where you override getTableCellRendererComponent method to render the desired column according to your need.
And then change the renderer for that column by the subclass of DefaultTableCellRenderer.
Here is the example to achieve this task:
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
import java.util.*;
public class TableExample extends JFrame
{
JTable myTable ;
Object[][] data= {
{"34","[56],987,[(56)]"},
{"5098","345,([{78}])"},
{"567","4312"}
};
Object[] col = {"First","Second"};
public TableExample()
{
super("CellRendererExample");
}
public void prepareAndShowGUI()
{
myTable = new JTable(data,col);
myTable.getColumnModel().getColumn(1).setCellRenderer(new MyTableCellRenderer());
JScrollPane jsp = new JScrollPane(myTable);
getContentPane().add(jsp);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
}
public class MyTableCellRenderer extends DefaultTableCellRenderer
{
public Component getTableCellRendererComponent(JTable table,Object oValue, boolean isSelected, boolean hasFocus, int row, int column)
{
Component c = super.getTableCellRendererComponent(table, oValue,isSelected, hasFocus,row, column);
String value = (String)oValue;
StringBuilder sBuilder = new StringBuilder();
sBuilder.append("<HTML><BODY>");
StringTokenizer tokenizer = new StringTokenizer(value,",");
while (tokenizer.hasMoreTokens())
{
String token = tokenizer.nextToken();
int index = token.indexOf("[");
if (index != -1)
{
sBuilder.append(token.substring(0,index));
int lastIndex = token.lastIndexOf(']');
String subValue = token.substring(index + 1,lastIndex);
sBuilder.append("[<FONT color = red>"+subValue+"</FONT>]");
if (lastIndex < token.length() -1)
{
sBuilder.append(token.substring(lastIndex+1,token.length()));
}
sBuilder.append(",");
}
else
{
sBuilder.append(token+",");
}
}
if (sBuilder.lastIndexOf(",") == sBuilder.length() - 1)
{
sBuilder.deleteCharAt(sBuilder.length() - 1 );
}
sBuilder.append("</BODY></HTML>");
value = sBuilder.toString(); ;
JLabel label =(JLabel)c;
label.setText(value);
return label;
}
}
public static void main(String st[])
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
TableExample tae = new TableExample();
tae.prepareAndShowGUI();
}
});
}
}
来源：https://stackoverflow.com/questions/14546968/swing-is-it-possible-to-set-the-font-color-of-specific-text-within-a-jtable