修改Jtable字体颜色
今天写一篇关于JTable有关的文章，包括：为JTable单元格设置字体颜色、为JTable单元格设置背景色、让JTable某一列设置为不可能编辑。代码很简单，请朋友们参考如下：
package Java;
import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import java.awt.BorderLayout;
import javax.swing.JComboBox;
import javax.swing.table.TableColumn;
import javax.swing.DefaultCellEditor;
import javax.swing.table.DefaultTableCellRenderer;
import java.awt.Color;
import javax.swing.table.DefaultTableModel;
/**
* 设置单元格为不可编辑状态
*/
public class JTableFrame_4 extends JFrame {
private JPanel panel;
private JTable table; //定义个二维数据表格
private JScrollPane scrollPane; //定义带有滚动条的面板
private DefaultTableModel dtm; //定义表格模型，该模型可以存放数据
//初始化数据
Object[][] rowData = {
{"1001", "李汉", "软件部", new Double(3000)},
{"1002", "朱泽", "软件部", new Double(3100)},
{"1003", "刘宇", "经理部", new Double(3000)},
{"1004", "张斌", "软件部", new Double(4000)},
{"1005", "秦小", "人事部", new Double(4000)}
};
//初始化列名
Object[] columnNames = {"编号", "姓名", "部门", "月薪"};
public JTableFrame_4() {
super("单元格具有下拉框的表格");
init();
}
public void init() {
setSize(500, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//利用TableModel重新覆盖isCellEditable方法，将第一列变成不可编辑状态
dtm = new DefaultTableModel(rowData, columnNames) {
public boolean isCellEditable(int rowIndex, int columnIndex) {
boolean f = (0 <= rowIndex && rowIndex < getRowCount() && columnIndex == 0) ? false : true;
return f;
}
};
table = new JTable(dtm);
JComboBox comboBox = new JComboBox();
comboBox.addItem("软件部");
comboBox.addItem("经理部");
comboBox.addItem("人事部");
comboBox.addItem("后勤部");
comboBox.addItem("财务部");
//TableColumn主要作用可以对表格中的某一列的属性进行编辑
TableColumn tableColumn = table.getColumn("部门");
//利用TableColumn类中的setCellEditor()方法来设置单元格的编辑器
//DefaultCellEditor类可以将表格中的单元格设置成下拉框
tableColumn.s
etCellEditor(new DefaultCellEditor(comboBox));
//DefaultTableCellRenderer类可以绘制单元格的背景、字体颜色等功能
DefaultTableCellRenderer backGroundColor = new DefaultTableCellRenderer();
//绘制部门列的背景为黄色
backGroundColor.setBackground(Color.yellow);
tableColumn.setCellRenderer(backGroundColor);
TableColumn moneyColumn = table.getColumn("月薪");
//绘制月薪列的字体颜色
DefaultTableCellRenderer fontColor = new DefaultTableCellRenderer() {
public void setValue(Object value) { //重写setValue方法，从而可以动态设置列单元字体颜色
double a = (value instanceof Double) ? ((Double) value).doubleValue() : 0.0; //获取月薪列中的值
setForeground((a > 3099.0) ? Color.red : Color.black); //如果月薪大于3099元，就将字体设置为红色
setText((value == null) ? "" : value.toString());
}
};
moneyColumn.setCellRenderer(fontColor);
panel = new JPanel();
panel.setLayout(new BorderLayout());
scrollPane = new JScrollPane();
scrollPane.getViewport().setView(table); //把二维数据表格放到滚动面板中
panel.add(scrollPane, BorderLayout.CENTER); //把滚动面板添加到底层面板上
this.getContentPane().add(panel, BorderLayout.CENTER);
setVisible(true);
}
public static void main(String[] args) {
JTableFrame_4 f = new JTableFrame_4();
}
}
我想根据内容动态的设置单元格的字体颜色，比如“负值”显示为“红色”
//TableCellColor.java
import javax.swing.*;
import java.awt.*;
import javax.swing.table.*;
public class TableCellColor extends JFrame {
String[] columnNames = {"第1列", "第2列", "第3列"};
Object[][] data = {
{
"(1,1)", "(1,2)", "(1,3)"}
, {
"(2,1)", "(2,2)", "(2,3)"}
, {
"(3,1)", "(3,2)", "(3,3)"}
, {
"(4,1)", "(4,2)", "(4,3)"}
,
};
int r = 1, c = 0; // 用于控制变色区域
public TableCellColor() {
DefaultTableModel dtm = new DefaultTableModel(data, columnNames);
JTable table = new JTable(dtm);
table = new JTable(dtm) {
public Component prepareRenderer(TableCellRenderer renderer, int row,
int column) {
Component component = super.prepareRenderer(renderer, row, column);
if (row == r && column == c) {
component.setBackground(Color.gray);
}
return component;
}
};
JScrollPane scroll = new JScrollPane(table);
this.setContentPane(scroll);
this.setBounds(100, 50, 300, 150);
}
public static void main(String arg[]) {
TableCellColortes = new TableCellColor();
tes.setVisible(true);
tes.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}