wengdr.java

简单文本编辑器

import java.awt.Graphics;
import java.io.*;
import java.lang.*; 
import java.lang.Object;
import java.awt.*;
import java.awt.event.*;
import java.awt.Font;
import java.awt.color.*;
import java.awt.datatransfer.*; 
import javax.swing.*;


public class Wengdr extends Frame implements ActionListener{
 //定义变量
 
 String filename="wengdr";
 
 Color color=Color.blue,tempcolor;
 int size=25,tempsize;
 int style=Font.PLAIN,tempstyle;
 String name="宋体",tempname;
 static int fromindex=0;//指示字符串的位置
 Toolkit toolkit=Toolkit.getDefaultToolkit(); 
    Clipboard clipboard=toolkit.getSystemClipboard();//剪贴板对象 
 
// TextArea textarea=new TextArea("wengdr is a programfan",35,110,TextArea.SCROLLBARS_VERTICAL_ONLY);
 JTextArea textarea=new JTextArea("wengdr is a programfan",60,69);

 MenuBar menubar=new MenuBar();
 
 TextField txt1=new TextField(15);
 TextField txt2=new TextField(14);
 TextField txt3=new TextField(14);
 TextField txt4=new TextField(25);
 TextField txt5=new TextField(10);
    TextField txt6=new TextField(10);//各对话框中的文本
 
 List list1=new List(6);
 List list2=new List(6);
 List list3=new List(6);
 Label label=new Label("淮海工学院           ");
 
 Choice choice=new Choice();
 
  Menu Menu1=new Menu(" 文件   ");
  Menu Menu2=new Menu(" 编辑   ");
  Menu Menu3=new Menu(" 格式   ");
  Menu Menu4=new Menu(" 帮助   ");//菜单
  
  MenuItem MenuItem1=new MenuItem("新建");
  MenuItem MenuItem2=new MenuItem("打开");
  MenuItem MenuItem3=new MenuItem("保存");
  MenuItem MenuItem4=new MenuItem("另存为");
  MenuItem MenuItem5=new MenuItem("退出");
  MenuItem MenuItem6=new MenuItem("撤消");//
  MenuItem MenuItem7=new MenuItem("剪切");
  MenuItem MenuItem8=new MenuItem("复制");//
  MenuItem MenuItem9=new MenuItem("粘贴");
  MenuItem MenuItem10=new MenuItem("删除");//
  MenuItem MenuItem11=new MenuItem("查找");
  MenuItem MenuItem12=new MenuItem("查找下一个");
  MenuItem MenuItem13=new MenuItem("替换");
  MenuItem MenuItem14=new MenuItem("全选");
  MenuItem MenuItem15=new MenuItem("时间/日期");
  MenuItem MenuItem16=new MenuItem("中文/英文转换");
  MenuItem MenuItem17=new MenuItem("字体");
  MenuItem MenuItem18=new MenuItem("关于作者");
  MenuItem MenuItem19=new MenuItem("关于记事本");//菜单项
  FileDialog openfile=new FileDialog(this,"打开文件对话框",FileDialog.LOAD);
  FileDialog savefile=new FileDialog(this,"保存文件对话框",FileDialog.SAVE);
  FileDialog saveasfile=new FileDialog(this,"另存文件对话框",FileDialog.SAVE);
 // Dialog time=new Dialog(this,"当前时间",true);
  Dialog replace=new Dialog(this,"替换",true);
  Dialog search=new Dialog(this,"查找",true);
  Dialog Word=new Dialog(this,"字体",true);
  Dialog aboutAuthor=new Dialog(this,"关于作者",true);
  Dialog aboutNotepad=new Dialog(this,"关于记事本",true);//各个菜单项的对话框
  
 
 //定义构造函数
 public Wengdr(String ss){
  super(ss);
  textarea.setLineWrap(true);//自动换行
     this.setResizable(false);
  tempstyle=style;
     tempsize=size;
     tempcolor=color;
     tempname=name;
  setBackground(Color.white);
  setLayout(new FlowLayout());
  
  MenuItem1.addActionListener(this);
  MenuItem2.addActionListener(this);
  MenuItem3.addActionListener(this);
  MenuItem4.addActionListener(this);
  MenuItem5.addActionListener(this);
  MenuItem6.addActionListener(this);
  MenuItem6.setEnabled(false);
  MenuItem7.addActionListener(this);
  MenuItem8.addActionListener(this);
  MenuItem9.addActionListener(this);
  MenuItem10.addActionListener(this);
  MenuItem11.addActionListener(this);
  MenuItem12.addActionListener(this);
  MenuItem12.setEnabled(false);
  MenuItem13.addActionListener(this);
  MenuItem14.addActionListener(this);
  MenuItem15.addActionListener(this);
  MenuItem15.setEnabled(false);
  MenuItem16.addActionListener(this);
  MenuItem16.setEnabled(false);
  MenuItem17.addActionListener(this);
  MenuItem18.addActionListener(this);
  MenuItem19.addActionListener(this);//监听菜单项
  Menu1.add(MenuItem1);
  Menu1.add(MenuItem2);
  Menu1.add(MenuItem3);
  Menu1.add(MenuItem4);
  Menu1.addSeparator();
  Menu1.add(MenuItem5);
  menubar.add(Menu1);//文件菜单
  Menu2.add(MenuItem6);
  Menu2.addSeparator();
  Menu2.add(MenuItem7);
  Menu2.add(MenuItem8);
  Menu2.add(MenuItem9);
  Menu2.add(MenuItem10);
  Menu2.addSeparator();
  Menu2.add(MenuItem11);
  Menu2.add(MenuItem12);
  Menu2.add(MenuItem13);
  Menu2.addSeparator();
  Menu2.add(MenuItem14);
  Menu2.add(MenuItem15);
  menubar.add(Menu2);//编辑菜单
  Menu3.add(MenuItem16);
  Menu3.addSeparator();
  Menu3.add(MenuItem17);
  menubar.add(Menu3);//格式菜单
  Menu4.add(MenuItem18);
  Menu4.addSeparator();
  Menu4.add(MenuItem19);
  menubar.add(Menu4);//帮助
  setMenuBar(menubar);
  add(textarea);
  replace_dialog();
  search_dialog();
  Dialog_Word( );
  Dialog_aboutAuthor();
  Dialog_aboutNotepad();//调用对话框
  }
  //各菜单项的事件处理
  public void actionPerformed(ActionEvent e){
   Object obj=e.getSource();
   if(obj==MenuItem1){textarea.setText("");
   }
   if(obj==MenuItem2){
    openfile.show(); 
                filename=openfile.getDirectory()+openfile.getFile(); 
                if(filename!=null) 
                readfile(filename); 
   }
   if(obj==MenuItem3){
    if(filename!=null) 
                 writefile(filename);
   }
   if(obj==MenuItem4){
    saveasfile.show(); 
                filename=saveasfile.getDirectory()+saveasfile.getFile(); 
                if(filename!=null) 
                writefile(filename); 
   }
   if(obj==MenuItem5){System.exit(0);}
   if(obj==MenuItem7){
    String text=textarea.getSelectedText(); 
                StringSelection selection=new StringSelection(text); 
                clipboard.setContents(selection,null); 
                textarea.replaceRange("",textarea.getSelectionStart(),textarea.getSelectionEnd());
   }
   if(obj==MenuItem8){
    String text=textarea.getSelectedText(); 
                StringSelection selection=new StringSelection(text); 
                clipboard.setContents(selection,null);
   }
   if(obj==MenuItem9){
    Transferable contents=clipboard.getContents(this); 
                if(contents==null) 
                return; 
                String text; 
                text=""; 
               try{
                text=(String)contents.getTransferData(DataFlavor.stringFlavor);
                } 
                catch(Exception exception){} 
                textarea.replaceRange(text,textarea.getSelectionStart(),textarea.getSelectionEnd());
   }
   if(obj==MenuItem10){
    textarea.replaceRange("",textarea.getSelectionStart(),textarea.getSelectionEnd

());
   }
   if(obj==MenuItem11){search.show();}
   if(obj==MenuItem13){replace.show();}
   if(obj==MenuItem14){textarea.selectAll();}
   if(obj==MenuItem17){Word.show();}
   if(obj==MenuItem18){ aboutAuthor.show();}
   if(obj==MenuItem19){aboutNotepad.show();}
  }
  //读取文件
  public void readfile(String filename){ 
        try {       
         File file=new File(filename); 
         FileReader readIn=new FileReader(file); 
         int file_size=(int)file.length(); 
         int charsRead=0; 
         char[] content=new char[file_size]; 
         while(readIn.ready()) 
         charsRead+=readIn.read(content,charsRead,file_size-charsRead); 
         readIn.close(); 
         textarea.setText(new String(content,0,charsRead)); 
         } 
        catch(IOException e) { 
           System.out.println("Error! Opening file"); 
         } 
       } 
       //保存文件
      public void writefile(String filename){ 
          try{ 
           File file=new File(filename); 
           FileWriter write_out=new FileWriter(file); 
           write_out.write(textarea.getText()); 
           write_out.close(); 
          } 
          catch(IOException e){ 
             System.out.println("Error! writing file"); 
          } 
      } 
      //替换
      public void replace_dialog(){
  replace.setSize(200,200);
  replace.setResizable(false);
  replace.setLayout(new FlowLayout());
  replace.setBackground(Color.pink);
  Label label_1=new Label("  查找");
  Label label_2=new Label("  替换");
  Button button_1=new Button(" 确定 ");
  Button button_2=new Button(" 清空 ");
  replace.add(label_1);
  replace.add(txt5);
  replace.add(label_2);
  replace.add(txt6);
  replace.add(button_1);
  replace.add(button_2);
  button_1.addActionListener(new ActionListener(){
   public void actionPerformed(ActionEvent e){
     if(txt5.getText()=="");
    else{
     int locate=textarea.getText().indexOf(txt5.getText(),0);
     textarea.select(locate,locate+txt5.getText().length());
     textarea.replaceRange(txt6.getText(),locate,locate+txt5.getText().length());
     }
     txt5.setText("");