Question

Jtextarea如何设置不同字体、颜色

Answer 1

JTextArea不具备这项功能，可以使用JTextPane，操作Document控制JTextPane显示的内容

 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);
     }

 }

Answer 2

JTextArea本身不具备这样的功能，它是纯文本组件，你可以使用JTextPane，通过操作Document文档来控制JTextPane显示的内容，下面的代码在一个JTextPane中显示了一个图标，三行文字，每行用不同的颜色和大小显示：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.text.*;
import java.io.*;

public class Test {
JFrame frame;
JTextPane textPane;
File file;
Icon image;

public Test(){
frame = new JFrame("JTextPane");
textPane = new JTextPane();
file = new File("./classes/test/icon.gif");
image = new ImageIcon(file.getAbsoluteFile().toString());
}

public void insert(String str, AttributeSet attrSet) {
Document doc = textPane.getDocument();
str ="\n" + str ;
try {
doc.insertString(doc.getLength(), str, attrSet);
}
catch (BadLocationException e) {
System.out.println("BadLocationException: " + e);
}
}

public void setDocs(String str,Color col,boolean bold,int fontSize) {
SimpleAttributeSet attrSet = new SimpleAttributeSet();
StyleConstants.setForeground(attrSet, col);
//颜色
if(bold==true){
StyleConstants.setBold(attrSet, true);
}//字体类型
StyleConstants.setFontSize(attrSet, fontSize);
//字体大小
insert(str, attrSet);
}

public void gui() {
textPane.insertIcon(image);
setDocs("第一行的文字",Color.red,false,20);
setDocs("第二行的文字",Color.BLACK,true,25);
setDocs("第三行的文字",Color.BLUE,false,20);
frame.getContentPane().add(textPane, BorderLayout.CENTER);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}});
frame.setSize(200,300);
frame.setVisible(true);
}
public static void main(String[] args) {
Test test = new Test();
test.gui();

Answer 3

JTextArea本身不具备这样的功能，它是纯文本组件，你可以使用JTextPane，通过操作Document文档来控制JTextPane显示的内容，下面的代码在一个JTextPane中显示了一个图标，三行文字，每行用不同的颜色和大小显示： import javax.swing.*; import java.awt.*; import java.awt.event.*; import javax.swing.text.*; import java.io.*; public class Test { JFrame frame; JTextPane textPane; File file; Icon image; public Test(){ frame = new JFrame("JTextPane"); textPane = new JTextPane(); file = new File("./classes/test/icon.gif"); image = new ImageIcon(file.getAbsoluteFile().toString()); } public void insert(String str, AttributeSet attrSet) { Document doc = textPane.getDocument(); str ="\n" + str ; try { doc.insertString(doc.getLength(), str, attrSet); } catch (BadLocationException e) { System.out.println("BadLocationException: " + e); } } public void setDocs(String str,Color col,boolean bold,int fontSize) { SimpleAttributeSet attrSet = new SimpleAttributeSet(); StyleConstants.setForeground(attrSet, col); //颜色 if(bold==true){ StyleConstants.setBold(attrSet, true); }//字体类型 StyleConstants.setFontSize(attrSet, fontSize); //字体大小 insert(str, attrSet); } public void gui() { textPane.insertIcon(image); setDocs("第一行的文字",Color.red,false,20); setDocs("第二行的文字",Color.BLACK,true,25 查看原帖>>

Answer 4

java swing 中JTEXTAREA不能改变字体颜色，它是纯文本组件，可以使用JTEXTPANE，通过操作DOCUMENT文档来控制JTEXTPANE显示的内容，下面的代码在一个JTEXTPANE中显示了一个图标，三行文字，每行用不同的颜色和大小显示：

IMPORT JAVAX.SWING.*;
IMPORT JAVA.AWT.*;
IMPORT JAVA.AWT.EVENT.*;
IMPORT JAVAX.SWING.TEXT.*;
IMPORT JAVA.IO.*;

PUBLIC CLASS TEST {
JFRAME FRAME;
JTEXTPANE TEXTPANE;
FILE FILE;
ICON IMAGE;

PUBLIC TEST(){
FRAME = NEW JFRAME("JTEXTPANE");
TEXTPANE = NEW JTEXTPANE();
FILE = NEW FILE("./CLASSES/TEST/ICON.GIF");
IMAGE = NEW IMAGEICON(FILE.GETABSOLUTEFILE().TOSTRING());
}

PUBLIC VOID INSERT(STRING STR, ATTRIBUTESET ATTRSET) {
DOCUMENT DOC = TEXTPANE.GETDOCUMENT();
STR ="\N" + STR ;
TRY {
DOC.INSERTSTRING(DOC.GETLENGTH(), STR, ATTRSET);
}
CATCH (BADLOCATIONEXCEPTION E) {
SYSTEM.OUT.PRINTLN("BADLOCATIONEXCEPTION: " + E);
}
}

PUBLIC VOID SETDOCS(STRING STR,COLOR COL,BOOLEAN BOLD,INT FONTSIZE) {
SIMPLEATTRIBUTESET ATTRSET = NEW SIMPLEATTRIBUTESET();
STYLECONSTANTS.SETFOREGROUND(ATTRSET, COL);
//颜色
IF(BOLD==TRUE){
STYLECONSTANTS.SETBOLD(ATTRSET, TRUE);
}//字体类型
STYLECONSTANTS.SETFONTSIZE(ATTRSET, FONTSIZE);
//字体大小
INSERT(STR, ATTRSET);
}

PUBLIC VOID GUI() {
TEXTPANE.INSERTICON(IMAGE);
SETDOCS("第一行的文字",COLOR.RED,FALSE,20);
SETDOCS("第二行的文字",COLOR.BLACK,TRUE,25);
SETDOCS("第三行的文字",COLOR.BLUE,FALSE,20);
FRAME.GETCONTENTPANE().ADD(TEXTPANE, BORDERLAYOUT.CENTER);
FRAME.ADDWINDOWLISTENER(NEW WINDOWADAPTER() {
PUBLIC VOID WINDOWCLOSING(WINDOWEVENT E) {
SYSTEM.EXIT(0);
}});
FRAME.SETSIZE(200,300);
FRAME.SETVISIBLE(TRUE);
}
PUBLIC STATIC VOID MAIN(STRING[] ARGS) {
TEST TEST = NEW TEST();
TEST.GUI();
}
}