JTextArea如何显示不同字体不同颜色的文字？

Question

jTextArea.setFont(fontName);
jTextArea.setForeground(Color.color);

Answer 1

要用 JTextPane   JTextPane jTextPane1 = new JTextPane();
  private StyledDocument document = (StyledDocument)jTextPane1.getDocument();
  private SimpleAttributeSet attributes = new SimpleAttributeSet();
  private void setCharacterColor(Color c){
    StyleConstants.setForeground(attributes, c);    int start  = this.jTextPane1.getSelectionStart();
    int len = this.jTextPane1.getSelectedText().length();
    document.setCharacterAttributes(start, len, attributes, false);
  }

Answer 2

给你一个例子 以前写的 改改还能用
import java.util.*;import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;public class Editor extends JFrame {
  JScrollPane jScrollPane1 = new JScrollPane();
  JTextPane jTextPane1 = new JTextPane();
  JToolBar jToolBar1 = new JToolBar();
  JButton jButton1 = new JButton();  Hashtable actionTable = new Hashtable();
  //String[] ActionNames = {"font-italic", "font-bold", "font-underline","font-size-24"};
  private StyledDocument document = (StyledDocument)jTextPane1.getDocument();
  private SimpleAttributeSet attributes = new SimpleAttributeSet();
  JButton jButton2 = new JButton();
  JPopupMenu jPopupMenu_FontFamily = new JPopupMenu();
  JPopupMenu jPopupMenu_FontSize = new JPopupMenu();  public static void main(String[] args) {
    Editor t = new Editor();
    t.setLocation(50, 30);
    t.setSize(500, 200);
    t.show();
  }  public Editor() {
    try {
      jbInit();
      UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
      SwingUtilities.updateComponentTreeUI(this);
    } catch(Exception e) {
      e.printStackTrace();
    }
  }  private void jbInit() throws Exception {
    jButton1.setText("Font Family");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jButton1_actionPerformed(e);
      }
    });
    jButton2.setText("Font Size");
    jButton2.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jButton2_actionPerformed(e);
      }
    });
    jTextPane1.setSelectedTextColor(new Color(255,255,255));
    jTextPane1.setSelectionColor(new Color(57,102,160));
    jTextPane1.setText("jTextPane1");    this.getContentPane().add(jScrollPane1, BorderLayout.CENTER);
    jScrollPane1.getViewport().add(jTextPane1, null);
    this.getContentPane().add(jToolBar1, BorderLayout.NORTH);
    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e){
        System.exit(0);
      }
    });    this.loadActionTable();
    this.createToolBar();
  }  void jButton1_actionPerformed(ActionEvent e) {
    this.jPopupMenu_FontFamily.show(jButton1,jButton1.getX(),jButton1.getY()+jButton1.getHeight());
  }  void jButton2_actionPerformed(ActionEvent e) {
    this.jPopupMenu_FontSize.show(jButton2,jButton1.getX(),jButton2.getY()+jButton2.getHeight());
  }
//==================================================================
  private void loadActionTable() {
    Action[] actions = this.jTextPane1.getActions();
    for(int i = 0; i < actions.length; i++) {
      actionTable.put(actions[i].getValue(Action.NAME), actions[i]);
/*if(actions[i].getValue(Action.NAME).toString().indexOf("justify")!= -1)
System.out.println( actions[i].getValue(Action.NAME));//i + " :" +*/
    }
  }  private void createToolBar(){
    String[] Styles = { "font-italic", "font-bold", "font-underline"};
    String[] Sizes = {"font-size-8" ,"font-size-12","font-size-14",
                      "font-size-16","font-size-18","font-size-24",
                      "font-size-32","font-size-36","font-size-48"};
    String[] Familys = {"font-family-SansSerif","font-family-Serif","font-family-Monospaced"};
    String[] Justifys = {"left-justify","center-justify","right-justify"};    // ToolBar
    jToolBar1.add(jButton1, null);
    jToolBar1.add(jButton2, null);
    for(int i = 0; i < Styles.length; i++)
      this.jToolBar1.add((Action)this.actionTable.get(Styles[i]));
    // Menu
    for(int i = 0; i < Familys.length; i++)
      this.jPopupMenu_FontFamily.add((Action)this.actionTable.get(Familys[i]));
    System.out.println(Sizes.length);
    for(int i = 0; i < Sizes.length; i++){
      Action action = (Action)this.actionTable.get(Sizes[i]);
      if(action != null){
        this.jPopupMenu_FontSize.add(action);
        System.out.println(i);
      }
    }
  }//================================================================  private void setCharacterColor(Color c){
    StyleConstants.setForeground(attributes, c);    int start  = this.jTextPane1.getSelectionStart();
    int len = this.jTextPane1.getSelectedText().length();
    document.setCharacterAttributes(start, len, attributes, false);
  }}