java仿windows记事本小程序

import java.awt.checkboxmenuitem;

import java.awt.font;

import java.awt.frame;

import java.awt.menu;

import java.awt.menubar;

import java.awt.menuitem;

import java.awt.menushortcut;

import java.awt.textarea;

import java.awt.toolkit;

import java.awt.event.actionevent;

import java.awt.event.actionlistener;

import java.awt.event.itemevent;

import java.awt.event.itemlistener;

import java.awt.event.keyevent;

import java.awt.event.windowadapter;

import java.awt.event.windowevent;

import java.awt.peer.buttonpeer;

import java.io.bufferedreader;

import java.io.file;

import java.io.fileinputstream;

import java.io.filenotfoundexception;

import java.io.fileoutputstream;

import java.io.ioexception;

import java.io.inputstreamreader;

import java.io.outputstream;

import java.io.stringreader;

import java.io.stringwriter;

import java.sql.date;

import java.text.simpledateformat;

import javax.print.docflavor.string;

import javax.script.scriptexception;

import javax.swing.borderfactory;

import javax.swing.boxlayout;

import javax.swing.buttongroup;

import javax.swing.jfilechooser;

import javax.swing.jframe;

import javax.swing.joptionpane;

import javax.swing.jpanel;

import javax.swing.jradiobutton;

import javax.swing.jscrollbar;

import javax.swing.jscrollpane;

import javax.swing.jtextarea;

import javax.swing.border.etchedborder;

import javax.swing.border.titledborder;

import javax.swing.event.ancestorlistener;

import javax.swing.filechooser.filenameextensionfilter;

public class crazy_15_4 {

  private jframe f = new jframe( "记事本" );

  //成员变量

  static string shearplate = null ;

  static boolean isautowrap = true ; //是否自动换行

  jtextarea ta = new jtextarea( 20 , 60 );

  jscrollpane jsp = new jscrollpane(ta);

  private menubar mb = new menubar();

  public string fontstr = "宋体" ;

  public string shapestr = "0" ;

  public string sizestr = "20" ;

  font font = new font(fontstr, integer.parseint(shapestr),integer.parseint(sizestr) );

  //menu

  menu file = new menu( "文件" );

  menu edit = new menu( "编辑" );

  menu format = new menu( "格式" );

  //menuitem

  menuitem newitem = new menuitem( "新建" );

  menuitem openitem = new menuitem( "打开" );

  menuitem saveitem = new menuitem( "保存" );

  menuitem saveasitem = new menuitem( "另存为" );

  menuitem cutitem = new menuitem( "剪切" );

  menuitem copyitem = new menuitem( "复制" );

  menuitem pasteitem = new menuitem( "粘贴" );

  checkboxmenuitem autowrap = new checkboxmenuitem( "自动换行" ,isautowrap);

  menuitem fontitem = new menuitem( "字体" );

  //使用[ctrl+x]快捷键

  menuitem exitiitem = new menuitem( "退出" , new menushortcut(keyevent.vk_x));

  public void init() {

  //带滚动条的文本域

  ta.setlinewrap(isautowrap);

  jsp.sethorizontalscrollbarpolicy(jscrollpane.horizontal_scrollbar_never);

  jsp.setverticalscrollbarpolicy(jscrollpane.vertical_scrollbar_as_needed);

  file.add(newitem);

  file.add(openitem);

  file.add(saveitem);

  file.add(saveasitem);

  edit.add(cutitem);

  edit.add(copyitem);

  edit.add(pasteitem);

  format.add(autowrap);

  format.add(fontitem);

  mb.add(file);

  mb.add(edit);

  mb.add(format);

  f.setmenubar(mb);

  f.addwindowlistener( new windowadapter() {

  public void windowclosing(windowevent we) {

  if (!(ta.gettext().equals( "" ))) {

   object[] options = { "保存" , "不保存" , "取消" };

   int a = joptionpane.showoptiondialog( null , "是否将更改保存到h:/programing/无标题.txt" , "记事本" , joptionpane.yes_no_cancel_option,joptionpane.question_message, null , options, options[ 0 ]);

   if (a == joptionpane.ok_option ) {

   if (save()) {

   system.exit( 0 );

   }

   } else if (a == joptionpane.no_option) {

   system.exit( 0 );

   }

  } else {

   system.exit( 0 );

  }

  }

  });

  newitem.addactionlistener( new newlistener());

  openitem.addactionlistener( new openlistener());

  saveitem.addactionlistener( new savelistener());

  saveasitem.addactionlistener( new saveaslistener());

  cutitem.addactionlistener( new cutaslistener());

  copyitem.addactionlistener( new copyaslistener());

  pasteitem.addactionlistener( new pasteaslistener());

  autowrap.additemlistener( new autowrapaslistener());

  fontitem.addactionlistener( new fontlistener());

  ta.setfont(font);

  //使文本框处在屏幕中间

  int width = toolkit.getdefaulttoolkit().getscreensize().width;

  int height = toolkit.getdefaulttoolkit().getscreensize().height;

  f.add(jsp);

  f.pack();

  f.setlocation(width/ 2 -f.getwidth()/ 2 , height/ 2 -f.getheight()/ 2 );

  f.setvisible( true );

  //避免关闭对话框直接关闭文本文件

  f.setdefaultcloseoperation(jframe.do_nothing_on_close);

  }

  public static void main(string[] args) {

  new crazy_15_4().init();

  }

  //是否保存

  public void saveornot() {

  if (!(ta.gettext().equals( "" ))) {

  object[] options = { "保存" , "不保存" , "取消" };

  int a = joptionpane.showoptiondialog( null , "是否将更改保存到h:/programing/无标题.txt" , "记事本" , joptionpane.yes_no_cancel_option,joptionpane.question_message, null , options, options[ 0 ]);

  if (a == joptionpane.ok_option ) {

  save();

  }

  }

  }

  //保存文本文件

  public boolean save() {

  boolean issaved = false ;

  jfilechooser jf = new jfilechooser();

  filenameextensionfilter filter = new filenameextensionfilter( "txt" , "txt" );

  jf.setacceptallfilefilterused( false );

  jf.setfilefilter(filter);

  int value = jf.showsavedialog( null );

  if (value == jfilechooser.approve_option) {

  file file = jf.getselectedfile();

  string str = ta.gettext();

  byte [] buf = str.getbytes();

  try {

  outputstream os = new fileoutputstream(file);

  os.write(buf);

  os.flush();

  os.close();

  issaved = true ;

  } catch (ioexception e) {

  e.printstacktrace();

  }

  }

  return issaved;

  }

  //新建监听器

  class newlistener implements actionlistener{

  public void actionperformed(actionevent e) {

  if (!(ta.gettext().equals( "" ))) {

  object[] options = { "保存" , "不保存" , "取消" };

  int a = joptionpane.showoptiondialog( null , "是否将更改保存到h:/programing/无标题.txt" , "记事本" , joptionpane.yes_no_cancel_option,joptionpane.question_message, null , options, options[ 0 ]);

  if (a == joptionpane.ok_option ) {

   if (save()) {

   ta.settext( "" );

   }

  } else if (a == joptionpane.no_option) {

   ta.settext( "" );

  }

  }

  }

  }

  //打开监听器，从硬盘目录打开文本文件

  class openlistener implements actionlistener{

  public void actionperformed(actionevent e) {

  jfilechooser jf = new jfilechooser();

  filenameextensionfilter filter = new filenameextensionfilter( "txt" , "txt" );

  jf.setacceptallfilefilterused( false );

  jf.setfilefilter(filter);

  int value = jf.showopendialog( null );

  if (value == jfilechooser.approve_option) {

  file file = jf.getselectedfile();

  try {

   string encoding = "gbk" ; //考虑编码格式

   inputstreamreader isr = new inputstreamreader( new fileinputstream(file),encoding);

   bufferedreader br = new bufferedreader(isr);

   string str = null ;

   while ((str = br.readline()) != null ) {

   ta.append(str);

   }

  } catch (filenotfoundexception e1) {

   // todo auto-generated catch block

   e1.printstacktrace();

  } catch (ioexception e1) {

   // todo auto-generated catch block

   e1.printstacktrace();

  }

  }

  }

  }

  //保存监听器，以电脑时间命名

  class savelistener implements actionlistener{

  public void actionperformed(actionevent e) {

  string name = null ;

  simpledateformat df = new simpledateformat( "yyyy-mm-dd hh-mm-ss" );

  name = df.format(system.currenttimemillis());

  file file = new file( "h:/programing/workspace/" +name+ ".txt" );

  string str = ta.gettext();

  byte [] buf = str.getbytes();

  if (!str.equals( "" )) {

  try {

   outputstream os = new fileoutputstream(file);

   os.write(buf);

   os.flush();

   os.close();

  } catch (ioexception e2) {

   e2.printstacktrace();

  }

  }

  }

  }

  //另存为监听器

  class saveaslistener implements actionlistener{

  public void actionperformed(actionevent e) {

  save();

  }

  }

  //剪切监听器

  class cutaslistener implements actionlistener{

  public void actionperformed(actionevent e) {

  shearplate = ta.getselectedtext();

  int startposi = ta.getselectionstart();

  int endposi = ta.getselectionend();

  stringbuffer sb = new stringbuffer(ta.gettext());

  sb.delete(startposi, endposi);

  ta.settext(sb.tostring());

  }

  }

  //复制监听器

  class copyaslistener implements actionlistener{

  public void actionperformed(actionevent e) {

  shearplate = ta.getselectedtext();

  }

  }

  //粘贴监听器

  class pasteaslistener implements actionlistener{

  public void actionperformed(actionevent e) {

  int position = ta.getcaretposition();

  stringbuilder sb = new stringbuilder(ta.gettext());

  sb.insert(position, shearplate);

  ta.settext(sb.tostring());

  ta.setcaretposition(position+shearplate.length());

  }

  }

  //自动换行监听器

  class autowrapaslistener implements itemlistener{

  @override

  public void itemstatechanged(itemevent e) {

  if (autowrap.getstate()) {

   isautowrap = true ;

   ta.setlinewrap(isautowrap);

   jsp.sethorizontalscrollbarpolicy(jscrollpane.horizontal_scrollbar_never);

   jsp.setverticalscrollbarpolicy(jscrollpane.vertical_scrollbar_as_needed);

  } else {

   isautowrap = false ;

   ta.setlinewrap(isautowrap);

   jsp.sethorizontalscrollbarpolicy(jscrollpane.horizontal_scrollbar_as_needed);

   jsp.setverticalscrollbarpolicy(jscrollpane.vertical_scrollbar_never);

  }

  }

  }

  //字体监听器

  class fontlistener implements actionlistener{

  jframe jf = new jframe( "字体" );

  jpanel jp = new jpanel();

  buttonpanel fontbutton = new buttonpanel( "字体" , new string[] { "宋体" , "黑体" , "楷体" , "吴祎晗1.0" });

  buttonpanel shapebutton = new buttonpanel( "字形" , new string[] { "常规" , "粗体" , "斜体" , "粗体&斜体" });

  buttonpanel sizebutton = new buttonpanel( "字号" , new string[] { "12" , "16" , "20" , "24" , "26" });

  public void actionperformed(actionevent e) {

  jp.setborder( new titledborder( new etchedborder(), "字体选择" ,titledborder.center,titledborder.top));

  jp.add(fontbutton);

  jp.add(shapebutton);

  jp.add(sizebutton);

  jf.add(jp);

  jf.pack();

  jf.setlocationrelativeto(f);

  jf.setvisible( true );

  jf.addwindowlistener( new windowadapter() {

   public void windowclosing(windowevent e) {

   fontstr = fontbutton.getselec();

   sizestr = sizebutton.getselec();

   font = new font(fontstr, shapeval(shapebutton.getselec()), integer.parseint(sizestr));

   ta.setfont(font);

   }

  });

  }

  public int shapeval(string str) {

  int a = 0 ;

  switch (str) {

  case "常规" :

   a = 0 ;

   break ;

  case "粗体" :

   a = 1 ;

   break ;

  case "斜体" :

   a = 2 ;

   break ;

  case "粗体&斜体" :

   a = 3 ;

   break ;

  }

  return a;

  }

  }

}

//定义一个jpanel类扩展类，该类的对象包含多个纵向排列的

//jradiobutton控件，且panel扩展类可以指定一个字符串作为titledborder

class buttonpanel extends jpanel{

  private buttongroup group;

  public buttonpanel(string title, string[] options) {

  setborder(borderfactory.createtitledborder(borderfactory.createetchedborder(),title));

  setlayout( new boxlayout( this , boxlayout.y_axis));

  group = new buttongroup();

  for ( int i= 0 ; options!= null &&i<options.length; i++) {

  jradiobutton b = new jradiobutton(options[i]);

  b.setactioncommand(options[i]);

  this .add(b);

  group.add(b);

  if (title.equals( "字号" )) {

  b.setselected(i == 2 );

  } else {

  b.setselected(i == 0 );

  }

  }

  }

  public string getselec() {

  return group.getselection().getactioncommand();

  }

}