复制以下代码，修改相应地方即可：
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private static void loadIndyFont()
{
UIManager.put("CheckBox.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("Tree.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("Viewport.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("ProgressBar.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("RadioButtonMenuItem.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("FormattedTextField.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("ToolBar.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("ColorChooser.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("ToggleButton.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("Panel.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("TextArea.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("Menu.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("RadioButtonMenuItem.acceleratorFont", new java.awt.Font("宋体", 0, 12));
UIManager.put("Spinner.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("Menu.acceleratorFont", new java.awt.Font("宋体", 0, 12));
UIManager.put("CheckBoxMenuItem.acceleratorFont", new java.awt.Font("宋体", 0, 12));
UIManager.put("TableHeader.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("TextField.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("OptionPane.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("MenuBar.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("Button.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("Label.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("PasswordField.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("InternalFrame.titleFont", new java.awt.Font("宋体", 0, 12));
UIManager.put("OptionPane.buttonFont", new java.awt.Font("宋体", 0, 12));
UIManager.put("ScrollPane.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("MenuItem.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("ToolTip.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("List.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("OptionPane.messageFont", new java.awt.Font("宋体", 0, 12));
UIManager.put("EditorPane.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("Table.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("TabbedPane.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("RadioButton.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("CheckBoxMenuItem.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("TextPane.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("PopupMenu.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("TitledBorder.font", new java.awt.Font("宋体", 0, 12));
UIManager.put("ComboBox.font", new java.awt.Font("宋体", 0, 12));
}
如果是swing的话
JLabel jl = new JLabel("标签");
jl.setBounds(10, 10, 10, 10);这是控制标签位置；
控制文本的位置，你可以通过在“”里边加空格控制
jl.setFont(new Font("宋体", Font.BOLD, 20));
这是控制文本字体，那个20就是大小选择，可以改变的
我在你的基础上稍微添加了一些代码，现在可以改变字体大小了：
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
class FontDialog extends JDialog implements ItemListener, ActionListener {
JComboBox list;
JComboBox listSize; //显示可以选择的字体大小
JTextArea text;
Font font;
JButton yes, cancel;
JComponent com;
FontDialog(JComponent com) {
this.com = com;
setModal(true);
yes = new JButton("Yes");
cancel = new JButton("cancel");
yes.addActionListener(this);
cancel.addActionListener(this);
text = new JTextArea(2, 25);
list = new JComboBox();
listSize = new JComboBox();
GraphicsEnvironment ge = GraphicsEnvironment
.getLocalGraphicsEnvironment();
String fontName[] = ge.getAvailableFontFamilyNames();
for (int i = 0; i fontName.length; i++){
list.addItem(fontName[i]);
}
//定义字体大小数组,字体大小可以自行定义
int[] fontSize = new int[20];
for (int i = 0; i fontSize.length; i++){
fontSize[i] = i+5;
listSize.addItem(fontSize[i]);
}
list.addItemListener(this);
listSize.addItemListener(this); //为设置字体大小的添加监听器
Container con = getContentPane();
con.setLayout(new FlowLayout());
Box boxH1 = Box.createHorizontalBox(), boxH2 = Box
.createHorizontalBox(), boxH3 = Box.createHorizontalBox();
Box boxBase = Box.createVerticalBox();
boxH1.add(list);
boxH1.add(listSize); //添加字体大小设置到面板中
boxH2.add(text);
boxH3.add(yes);
boxH3.add(cancel);
boxBase.add(boxH1);
boxBase.add(boxH2);
boxBase.add(boxH3);
con.add(boxBase);
setBounds(100, 100, 280, 170);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
validate();
}
public void itemStateChanged(ItemEvent e) {
String name = (String) list.getSelectedItem();
Integer size = (Integer) listSize.getSelectedItem(); //获得设置的字体大小
font = new Font(name, Font.PLAIN, size);
text.setFont(font);
text.setText("hello,奥运");
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == yes) {
com.setFont(font);
setVisible(false);
} else if (e.getSource() == cancel) {
setVisible(false);
}
}
}
class Dwindow extends JFrame implements ActionListener {
JTextArea text;
JToolBar bar;
Container con;
JButton buttonFont;
Dwindow() {
buttonFont = new JButton("设置字体");
text = new JTextArea("显示内容");
buttonFont.addActionListener(this);
bar = new JToolBar();
bar.add(buttonFont);
con = getContentPane();
con.add(bar, BorderLayout.NORTH);
con.add(new JScrollPane(text));
setBounds(60, 60, 300, 300);
setVisible(true);
validate();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == buttonFont) {
FontDialog dialog = new FontDialog(text);
dialog.setVisible(true);
}
}
}
public class DialogExample {
public static void main(String args[]) {
new Dwindow();
}
}
package hao;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.io.File;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;
public class ChatPanel extends JPanel {
private static final long serialVersionUID = 1L;
JButton send,record,saveRecord,image;
JTextArea inputArea;
JTextPane text;//注意用法****************************************************************************
JComboBox fontName = null, fontSize = null, fontStyle = null, fontColor = null,fontBackColor = null;
public StyledDocument doc = null; JScrollPane scrollPane;JPanel textChat;
JButton music;
public ChatPanel() {
setLayout(new BorderLayout());
text = new JTextPane();
text.setEditable(false);
doc = text.getStyledDocument();//跟踪文本和图片写到该区域的位置*************************************
scrollPane = new JScrollPane(text);
//注意下面对JComboBox的巧用***********************************************************************
String[] str_name = { "宋体", "黑体", "Dialog", "Gulim" };
String[] str_Size = { "12", "14", "18", "22", "30", "40" };
String[] str_Style = { "常规", "斜体", "粗体", "粗斜体" };
String[] str_Color = { "黑色", "红色", "蓝色", "黄色", "绿色" };
String[] str_BackColor = { "无色", "灰色", "淡红", "淡蓝", "淡黄", "淡绿" };
fontName = new JComboBox(str_name);
fontSize = new JComboBox(str_Size);
fontStyle = new JComboBox(str_Style);
fontColor = new JComboBox(str_Color);
fontBackColor = new JComboBox(str_BackColor);
fontName.setBackground(new Color(255,153,255));
fontSize.setBackground(new Color(255,153,255));
fontStyle.setBackground(new Color(255,153,255));
fontColor.setBackground(new Color(255,153,255));
fontBackColor.setBackground(new Color(255,153,255));
Box box = Box.createVerticalBox();//创建一个可以容纳多个Box组件的Box*******************************
Box box_1 = Box.createHorizontalBox();
Box box_2 = Box.createHorizontalBox();
Box box_4 = Box.createHorizontalBox();
box.add(box_1);
box.add(box_2);
box.add(box_4);
JLabel b1= new JLabel("字体~~"), b2 = new JLabel("样式~~"),b3 = new JLabel("字号~~"),b4 = new JLabel("颜色~~"),b5 = new JLabel("背景~~");
b1.setBackground(new Color(255,153,255));
b2.setBackground(new Color(255,153,255));
b3.setBackground(new Color(255,153,255));
b4.setBackground(new Color(255,153,255));
b5.setBackground(new Color(255,153,255));
box_1.add(b1);
box_1.add(fontName);
box_1.add(Box.createHorizontalStrut(8));
box_1.add(b2);
box_1.add(fontStyle);
box_1.add(Box.createHorizontalStrut(8));
box_1.add(b3);
box_1.add(fontSize);
box_2.add(Box.createHorizontalStrut(8));
box_2.add(b4);
box_2.add(fontColor);
box_2.add(Box.createHorizontalStrut(8));
box_4.add(b5);
box_4.add(fontBackColor);
textChat = new JPanel();
textChat.setLayout(new BorderLayout());
textChat.setBackground(new Color(255,153,255));
inputArea = new JTextArea(3, 20);
inputArea.setLineWrap(true); //设置文本区的换行策略。88888*********************************
send = new JButton("发送");
record=new JButton("显示记录");
saveRecord=new JButton("储存记录");
image=new JButton("表情");
send.setBackground(new Color(255,153,255));
record.setBackground(new Color(255,153,255));
saveRecord.setBackground(new Color(255,153,255));
image.setBackground(new Color(255,153,255));
Box box_3 = Box.createHorizontalBox();
box_3.add(send); box_3.add(Box.createHorizontalStrut(8));//设置按钮间距*************************888
box_3.add(record); box_3.add(Box.createHorizontalStrut(8)); //设置按钮间距*************************888
box_3.add(saveRecord); box_3.add(Box.createHorizontalStrut(8));//设置按钮间距*************************888
box_3.add(image);
box.setBorder(BorderFactory.createLineBorder(new Color(102,102,0),5));//设置Box的边框线********************
box_3.setBorder(BorderFactory.createLineBorder(new Color(102,102,0),5));
textChat.add(box,BorderLayout.NORTH);
textChat.add(inputArea,BorderLayout.CENTER);
textChat.add(box_3, BorderLayout.SOUTH);
inputArea.requestFocus(true);
inputArea.setBorder(BorderFactory.createLineBorder(new Color(102,102,0),5));//设置输入窗口边框线*******************
text.setBorder(BorderFactory.createLineBorder(new Color(102,102,0),8));//设置输入窗口边框线*******************
JPanel audioPanel = new JPanel();//最上面的边框************************************************************************
audioPanel.setBackground(new Color(255,153,255));
audioPanel.setLayout(new GridLayout(1,1));
music = new JButton("想听就听");
music.setPreferredSize(new Dimension(320,50));
music.setBorder(BorderFactory.createLineBorder(Color.BLACK,10));//设置输入窗口边框线*******************
audioPanel.add(music);
add(audioPanel, BorderLayout.NORTH);
add(scrollPane,BorderLayout.CENTER);
add(textChat, BorderLayout.SOUTH);
}
void insertIcon(ImageIcon image) {
text.setCaretPosition(doc.getLength());
text.insertIcon(image);
insert(new MessageStyle());//?????????????????????????????????????????????????????????????????????????????/
}
public void insert(MessageStyle attrib) {
try {
doc.insertString(doc.getLength(), attrib.getText() + "\n", attrib.getAttrSet());//写完后接着换行************
} catch (BadLocationException e) {
e.printStackTrace();
}
}
public MessageStyle getMessageStyle(String line) {
MessageStyle att = new MessageStyle();
att.setText(line);
att.setName((String) fontName.getSelectedItem());
att.setSize(Integer.parseInt((String) fontSize.getSelectedItem()));
String temp_style = (String) fontStyle.getSelectedItem();
if (temp_style.equals("常规")) {
att.setStyle(MessageStyle.GENERAL);
}
else if (temp_style.equals("粗体")) {
att.setStyle(MessageStyle.BOLD);
}
else if (temp_style.equals("斜体")) {
att.setStyle(MessageStyle.ITALIC);
}
else if (temp_style.equals("粗斜体")) {
att.setStyle(MessageStyle.BOLD_ITALIC);
}
String temp_color = (String) fontColor.getSelectedItem();
if (temp_color.equals("黑色")) {
att.setColor(new Color(0, 0, 0));
}
else if (temp_color.equals("红色")) {
att.setColor(new Color(255, 0, 0));
}
else if (temp_color.equals("蓝色")) {
att.setColor(new Color(0, 0, 255));
}
else if (temp_color.equals("黄色")) {
att.setColor(new Color(255, 255, 0));
}
else if (temp_color.equals("绿色")) {
att.setColor(new Color(0, 255, 0));
}
String temp_backColor = (String) fontBackColor.getSelectedItem();
if (!temp_backColor.equals("无色")) {
if (temp_backColor.equals("灰色")) {
att.setBackColor(new Color(200, 200, 200));
}
else if (temp_backColor.equals("淡红")) {
att.setBackColor(new Color(255, 200, 200));
}
else if (temp_backColor.equals("淡蓝")) {
att.setBackColor(new Color(200, 200, 255));
}
else if (temp_backColor.equals("淡黄")) {
att.setBackColor(new Color(255, 255, 200));
}
else if (temp_backColor.equals("淡绿")) {
att.setBackColor(new Color(200, 255, 200));
}
}
return att;
}
}