java 文本编辑器 源码_java文本编辑器源码

import javax.swing.*; import java.awt.*; import java.io.*; import java.awt.event.*; public class TxtEditor extends JFrame implements ActionListener{ String file_name; String file_dir; String tempString; //上次保存后的文件名和地址 String fileName = ""; JPanel x=new JPanel(); JTextArea wen=new JTextArea(20,50);JMenuItem ziti=new JMenuItem("字体"); JMenuItem a=new JMenuItem("普通");//定义菜单项 JMenuItem xin=new JMenuItem("新建"); JMenuItem open=new JMenuItem("打开"); JMenuItem save=new JMenuItem("保存 "); JMenuItem lsave=new JMenuItem("另存为"); JMenuItem tui=new JMenuItem("退出"); JMenuItem cut=new JMenuItem("剪切 "); JMenuItem copy=new JMenuItem("复制"); JMenuItem cast=new JMenuItem("粘贴"); JMenuItem delete=new JMenuItem("删除 "); JMenuItem b=new JMenuItem("粗体"); JMenuItem c=new JMenuItem("斜体"); TxtEditor(){ super ("文本编辑器 By 强凯 V1.0"); //小小对话框 setBounds(250,100,700,450); setDefaultCloseOperation(DO_NOTHING_ON_CLOSE); addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e) { int option= JOptionPane.showConfirmDialog( TxtEditor.this, "你真的想退出吗... ", "系统和你对话 ",JOptionPane.YES_NO_OPTION); if(option==JOptionPane.YES_OPTION) if(e.getWindow() == TxtEditor.this) {System.exit(0);}else{return; } } }); //热键设置 xin.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,ActionEvent.CTRL_MASK)); open.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,ActionEvent.CTRL_MASK)); save.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,ActionEvent.CTRL_MASK)); cut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,ActionEvent.CTRL_MASK)); copy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,ActionEvent.CTRL_MASK)); cast.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,ActionEvent.CTRL_MASK)); //定义面板 // x.add(add(new JScrollPane (wen));//);//滚动条wen.setFont(new Font("楷体" , Font.PLAIN ,20));// wen.setBackground(Color.blue);// add(x); //菜单栏的创建 JMenuBar cai=new JMenuBar(); this.setJMenuBar(cai); cai.setOpaque(true); JMenu jian=new JMenu("文件"); jian.add(xin); jian.add(open); jian.add(save); jian.add(lsave); jian.addSeparator( ); jian.add(tui); cai.add(jian); JMenu bian= new JMenu("编辑 "); bian.add(cut); bian.add(copy); bian.add(cast); bian.add(delete); cai.add(bian); JMenu geshi = new JMenu ("格式"); JMenu optionsMenu=new JMenu("字体"); geshi.add(optionsMenu); optionsMenu.add(a); optionsMenu.add(b); optionsMenu.add(c); cai.add(geshi); //增加监听器 xin.addActionListener(this); open.addActionListener(this); save.addActionListener(this); lsave.addActionListener(this); tui.addActionListener(this); cut.addActionListener(this); copy.addActionListener(this); cast.addActionListener(this); delete.addActionListener(this); ziti.addActionListener(this); a.addActionListener(this); b.addActionListener(this); c.addActionListener(this); // 文本框锁定//this.setResizable(false); } //重写方法 public void actionPerformed(ActionEvent e){ String actionCommand=e.getActionCommand(); if(e.getSource()instanceof JMenu); { if(e.getSource()==xin){ newfile(); } else if(e.getSource()==open){ openfile(); } else if(e.getSource()==save){ savefile(); } else if(e.getSource()==lsave){ lsavefile(); } else if(e.getSource()==cut){ cutfile(); } else if(e.getSource()==copy){ copyfile(); } else if(e.getSource()==cast){ castfile(); } else if(e.getSource()==delete){ deletefile(); } else if(e.getSource()==a){ afile(); } else if(e.getSource()==b){ bfile(); } else if(e.getSource()==c){ cfile(); } else if("退出".equals(actionCommand)) System.exit(0); } } // 方法定义 public void newfile(){savefile(); wen.setText(null); fileName = "";} //打开public void openfile(){String fileName = null;FileDialog df = new FileDialog(this,"打开文件",FileDialog.LOAD);df.setVisible(true);//建立新文件File f = new File( df.getDirectory()+df.getFile() );//得到文件名fileName = df.getDirectory()+df.getFile();//用此文件的长度建立一个字符数组 (特别标注)char ch[] = new char [(int)f.length()];//异常处理 try { //读出数据，并存入字符数组ch中 BufferedReader bw = new BufferedReader( new FileReader(f) ); bw.read(ch); bw.close(); } catch( FileNotFoundException fe ){ System.out.println("file not found"); System.exit(0); } catch( IOException ie){ System.out.println("IO error"); System.exit(0); } String s =new String (ch); wen.setText(s); }//保存 public void savefile(){ if( fileName.equals("") ){ FileDialog df = new FileDialog(this,"保存文件",FileDialog.SAVE);df.addWindowListener( new WindowAdapter(){ public void windowClosing(WindowEvent ee){ System.exit(0); } }); df.setVisible(true); String s = wen.getText();try { File f = new File( df.getDirectory()+df.getFile()); fileName = df.getDirectory()+df.getFile(); BufferedWriter bw = new BufferedWriter( new FileWriter (f)); bw.write(s , 0 , s.length()); bw.close(); } catch(FileNotFoundException fe_){ System.out.println("file not found"); System.exit(0); } catch( IOException ie_) { System.out.println(" IO error"); System.exit(0); } } //如果文件已经保存过 else { String s = wen.getText();try { File f = new File( fileName );BufferedWriter bw = new BufferedWriter( new FileWriter (f)); bw.write(s , 0 , s.length()); bw.close();} catch(FileNotFoundException fe_){ System.out.println("file not found"); System.exit(0); } catch( IOException ie_) { System.out.println(" IO error"); System.exit(0); }} } //另存为public void lsavefile(){FileDialog df = new FileDialog(this,"另存为",FileDialog.SAVE);df.addWindowListener( new WindowAdapter(){ public void windowClosing(WindowEvent ee){ System.exit(0); } }); df.setVisible(true); String s = wen.getText(); try { File f = new File( df.getDirectory()+df.getFile()); BufferedWriter bw = new BufferedWriter( new FileWriter (f)); bw.write(s , 0 , s.length()); bw.close(); } catch(FileNotFoundException fe_){ System.out.println("file not found"); System.exit(0); } catch( IOException ie_) { System.out.println(" IO error"); System.exit(0); } }//剪切public void cutfile(){ tempString = wen.getSelectedText(); StringBuffer tmp = new StringBuffer ( wen.getText()); int start = wen.getSelectionStart(); int len = wen.getSelectedText().length(); tmp.delete( start , start+len); wen.setText(tmp.toString()); } //复制 public void copyfile(){ tempString = wen.getSelectedText(); }//粘贴 public void castfile(){ StringBuffer tmp = new StringBuffer ( wen.getText());//得到要粘贴的位置int start = wen.getSelectionStart();tmp.insert(start , tempString); //用新文本设置原文本wen.setText(tmp.toString()); } //删除 public void deletefile(){ StringBuffer tmp = new StringBuffer ( wen.getText()); int start = wen.getSelectionStart(); int len = wen.getSelectedText().length(); tmp.delete( start , start+len); wen.setText(tmp.toString()); } //字体 public void afile(){ wen.setFont(new Font("楷体", Font.PLAIN ,wen.getFont().getSize()) );//普通文字 } public void bfile(){ wen.setFont(new Font("楷体" , Font.BOLD ,wen.getFont().getSize()) );//粗体文字} public void cfile(){ wen.setFont(new Font("楷体" , Font.ITALIC ,wen.getFont().getSize()) );//斜体文字 } public static void main(String[] args) { TxtEditor w=new TxtEditor(); w.pack(); w.setVisible(true); }