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。谷歌搜索了一下，我发现我可以用这样的东西做到这一点:

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;
    }
 }

我的问题是我想修改的代码已经为JTable的列设置了TableCellRendererer。代码中有一个函数如下所示:

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，我仍然需要添加前面显示的TableCellRenderer类吗？我要做的就是检查单元格的值是否为“ABC”，并将背景设置为红色。

更新:

我确实尝试将我的TableCellRenderer版本添加为要修改的代码中的内部类，但出现一个错误，指出tableColumn.getCellRenderer()的类型不匹配。

Type mismatch: cannot convert from TableCellRenderer to MyTableExample.TableCellRenderer

谢谢

最佳答案

重写prepareRenderer方法可以做到这一点。

例:

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: