Java Swing-根据单元格的值设置单元格的颜色
我想根据单元格的值设置单元格的颜色。在谷歌上搜索了一段时间后,我发现我可以用这样的方法来做:Java Swing-根据单元格的值设置单元格的颜色,java,swing,jtable,tablecellrenderer,Java,Swing,Jtable,Tablecellrenderer,我想根据单元格的值设置单元格的颜色。在谷歌上搜索了一段时间后,我发现我可以用这样的方法来做: public class TableCellRenderer extends DefaultTableCellRenderer { @Override public Component getTableCellRendererComponent( JTable table, Object value, boolean isSelected, boolean
public class TableCellRenderer extends DefaultTableCellRenderer {
@Override
public Component getTableCellRendererComponent(
JTable table, Object value,
boolean isSelected, boolean hasFocus,
int row, int col)
{
// get the DefaultCellRenderer to give you the basic component
Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, col);
// apply your rules
if (value.toString().equals("Red"))
c.setBackground(Color.RED);
else
c.setBackground(Color.GRAY);
return c;
}
}
private void configureTableColumns() {
Enumeration columns = this.table.getColumnModel().getColumns();
while (columns.hasMoreElements()) {
TableColumn tableColumn = (TableColumn) columns.nextElement();
this.setCellRenderer(tableColumn);
TableCellRenderer renderer = tableColumn.getCellRenderer();
if (renderer == null) {
renderer = this.table.getDefaultRenderer(Object.class);
}
tableColumn.setCellRenderer(renderer);
this.setCellEditor(tableColumn);
}
}
但我的问题是,我要修改的代码已经在为JTable的列设置TableCellRenderer。代码中有一个函数如下所示:
public class TableCellRenderer extends DefaultTableCellRenderer {
@Override
public Component getTableCellRendererComponent(
JTable table, Object value,
boolean isSelected, boolean hasFocus,
int row, int col)
{
// get the DefaultCellRenderer to give you the basic component
Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, col);
// apply your rules
if (value.toString().equals("Red"))
c.setBackground(Color.RED);
else
c.setBackground(Color.GRAY);
return c;
}
}
private void configureTableColumns() {
Enumeration columns = this.table.getColumnModel().getColumns();
while (columns.hasMoreElements()) {
TableColumn tableColumn = (TableColumn) columns.nextElement();
this.setCellRenderer(tableColumn);
TableCellRenderer renderer = tableColumn.getCellRenderer();
if (renderer == null) {
renderer = this.table.getDefaultRenderer(Object.class);
}
tableColumn.setCellRenderer(renderer);
this.setCellEditor(tableColumn);
}
}
使用上面的代码,我还需要添加前面显示的TableCellRenderer类吗?我只想检查单元格的值是否为“ABC”,并将背景设置为红色
更新:
我确实尝试将我版本的TableCellRenderer作为内部类添加到我要修改的代码中,但我得到一个错误,即tableColumn.getCellRenderer()中存在类型不匹配
感谢重写
prepareRenderer
方法
例如:
public Component prepareRenderer (TableCellRenderer renderer, int rowIndex, int columnIndex){
Component componenet = super.prepareRenderer(renderer, rowIndex, columnIndex);
if(getValueAt(rowIndex, columnIndex).toString().equals("Red")) {
componenet.setBackground(Color.RED);
} else if(getValueAt(rowIndex, columnIndex).toString().equals("Green")) {
componenet.setBackground(Color.GREEN);
}
return componenet;
}
更新:
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
public class PrepareRendereEx {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setSize(new Dimension(400, 100));
Object data[][] = { {"java", "j2ee"},
{"java", "j2ee"},
{"java", "j2ee"}
};
Object[] columnNames = {"Java", "J2EE"};
DefaultTableModel model = new DefaultTableModel(data, columnNames);
JTable table = new JTable(model) {
@Override
public Component prepareRenderer(TableCellRenderer renderer, int rowIndex,
int columnIndex) {
JComponent component = (JComponent) super.prepareRenderer(renderer, rowIndex, columnIndex);
if(getValueAt(rowIndex, 0).toString().equalsIgnoreCase("java") && columnIndex == 0) {
component.setBackground(Color.RED);
} else if(getValueAt(rowIndex, 1).toString().equalsIgnoreCase("j2ee") && columnIndex == 1){
component.setBackground(Color.GREEN);
}
return component;
}
};
frame.add(new JScrollPane(table));
frame.setVisible(true);
}
}
输出:
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
public class PrepareRendereEx {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setSize(new Dimension(400, 100));
Object data[][] = { {"java", "j2ee"},
{"java", "j2ee"},
{"java", "j2ee"}
};
Object[] columnNames = {"Java", "J2EE"};
DefaultTableModel model = new DefaultTableModel(data, columnNames);
JTable table = new JTable(model) {
@Override
public Component prepareRenderer(TableCellRenderer renderer, int rowIndex,
int columnIndex) {
JComponent component = (JComponent) super.prepareRenderer(renderer, rowIndex, columnIndex);
if(getValueAt(rowIndex, 0).toString().equalsIgnoreCase("java") && columnIndex == 0) {
component.setBackground(Color.RED);
} else if(getValueAt(rowIndex, 1).toString().equalsIgnoreCase("j2ee") && columnIndex == 1){
component.setBackground(Color.GREEN);
}
return component;
}
};
frame.add(new JScrollPane(table));
frame.setVisible(true);
}
}
当你否决我时,请发表评论,否则我怎么知道我做错了什么?唯一的学习方法是指出错误。如何访问示例中的表实例?如果我使用上面的方法,我将不得不做一些类似于table=newjtable(tableModel){……}的事情,所以表还不能访问。对吧?没错。我只是在飞行中写作。但是您可以直接调用getValueAt方法。请看我的更新。谢谢你让我有了一个很好的开端!