자바메모장3일차(4시간정도작업//파일연후 포커스수정요망)

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

public class NotePadExam extends JFrame
{
 JFrame jf,jf2;
 JPanel jp1,jp2;
 JMenuBar jmb;
 JMenu jmFile;
 JMenuItem jmi_CreateNew,jmi_Open,jmi_Save,jmi_OtherSave,jmi_Exit;
 JLabel jlb1;
 JTextArea jta;
 JDialog jd;

 public NotePadExam()
 {
 super("제목없음");
 try
 {
 
  //this.setDefaultCloseOperation(EXIT_ON_CLOSE);
  //jf = new JFrame();
  jf = this;
  jf.getContentPane().setLayout(new FlowLayout());
  //jf.getContentPane().setLayout(new BorderLayout());
  //jf = new JFrame();
 
  jp1 = new JPanel();
  jp2 = new JPanel();
  //jp1.setLayout(new FlowLayout());
 
  jmb = new JMenuBar();
  /*//////////////
  파일메뉴추가
  /*//////////////
  jmFile = new JMenu("파일");

 

  //jm=createMenuItem(jm,"열기");
  //jm=createMenuItem(jm,"저장");
  //jm=createMenuItem(jm,"다른이름으로 저장");
  //jm=createMenuItem(jm,"끝내기");
 
 
  jta = new JTextArea();

  JScrollPane scrollPane = new JScrollPane();
 scrollPane.setPreferredSize(new Dimension(450,400));
 scrollPane.setBorder(BorderFactory.createTitledBorder(""));
 scrollPane.getViewport().add(jta, null);

 //jpanel.add(scrollPane);

 

  //jta.setSize(30,50);
 
  //jd = new JDialog(this,"yes");
  //jd.setLayout(new FlowLayout());
  //jd.add(new Button("저장"));
  //jd.setSize(100,100);
 

  //jd.setVisible(true);
  //새로 만들기 이벤트 생성
  makeNewDoc(createMenuItem(jmFile,"새로만들기"),jta);
  //문서열기
  openDoc(createMenuItem(jmFile,"열기"),jta);
  //메뉴바추가
  jmb.add(jmFile);
  /*//////////////
  파일메뉴추가
  /*//////////////

  jp1.add(jmb);

  //jmb.setSize(50,200);
  //텍스트창추가
  jp2.add(scrollPane);

  jf.add(jp1);
  jf.add(jp2);
 

  //add(jf); 
  //jf.getContentPane().add(jp1,BorderLayout.CENTER);
  //createDialogBOx(this);

  jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 }
 catch (Exception ex)
 {
  ex.printStackTrace();
 }
 }

 public void openDoc(JMenuItem jmim,final JTextArea jtaa)
 {
  //문서열기 작업하기
 
  ActionListener al = new ActionListener()
  {
   public void actionPerformed(ActionEvent ae)
   {

    System.out.println("문서열기");

    String jtaaStr = jtaa.getText().trim();

    if(!jtaaStr.equals("") && jtaaStr != null)
    {
     System.out.println("널값 아님");
     //doOpenDialogForSave(jtaa);
     //기존파일이 있는 경우 저장창이 나온다.
    }
    else
    {
     //파일열기 대화상자를 열어야 한다.    
     NotePadJFileChooser dpjc = new NotePadJFileChooser("열기");
     int returnVal = dpjc.showOpenDialog(NotePadExam.this);
     if(returnVal == JFileChooser.APPROVE_OPTION)
     {
      File selectedFile = dpjc.getSelectedFile();
      FileInputStream fis=null;
   //FileOutputStream fos = null;
   BufferedInputStream dos = null;
      //StringBuffer strB = new StringBuffer();
      try
      {
       fis = new FileInputStream(selectedFile);   
    //dos = new BufferedInputStream(fis);
    byte[] buffer = new byte[512];
    int readcount = 0;
    //StringBuffer openedFileBuffer = new StringBuffer();
    String str = new String();
   
       while((readcount = fis.read(buffer)) != -1)
       {
  str+=new String(buffer,0,readcount,"EUC-KR");
  //System.out.println(str);
  
   //  for(int i=readcount;i<buffer
   // System.out.println(buffer.toString());
   //System.out.write(buffer,0,readcount);
   //openedFileBuffer.append(buffer,0,readcount);       
       }
   // System.out.println(openedFileBuffer);
  
    //jtaa.setText(openedFileBuffer);
    //BufferedInputStream bis = new BufferedInputStream(dos);
    System.out.println(str);
       jtaa.setText(str);
    jtaa.requestFocus();
    //jtta.setFocusable(true);
    //jtta.setCaretPosition(0);

      }
      catch (IOException ioe)
      {
       ioe.printStackTrace();
      }
      finally
      {
       try
       {
        fis.close();
       }
       catch (IOException e)
       {
       
       }
      
      }

     }
    }
   }
  };

  jmim.addActionListener(al);
 }
 public void makeNewDoc(JMenuItem jmim,final JTextArea jtaa)
 {
 //새파일 만들기 알고리즘////////////////////////////////////////////////////////////////////
 //새로만들기 메뉴아이템 이벤트 생성
 //1) 작업하던 문서가 없는 경우 바로 새문서 만듬///////////////////////////////////////////
 //2) 작업하던 문서가 있는 경우(저장 안했을 경우) 저장,저장안함,취소를 물어본후 1번 작업//
 //3) 작업하던 파일이 전과 비교했을 경우 변경된 게 없는 경우 이전 문서 닫고 새문서 만듬//
 ////////////////////////////////////////////////////////////////////////////////////////////
  
  ActionListener al = doOpenDialogForSave(jtaa);

  jmim.addActionListener(al);

 }
 
 public ActionListener doOpenDialogForSave(final JTextArea jtaa)
 {
  //return new ActionListener(){public void actionPerformed(ActionEvent ae){}};
 
  ActionListener al = new ActionListener()
  {
   public void actionPerformed(ActionEvent ae)
   {
    String str = jtaa.getText().trim();
    String msg[] = {"저장","저장안함","취소"};
    //일단 작업하던 문서가 있는 지 없는 지 체크함
   
    if(str.equals("") || str == null)
    {
     createNewDoc(jtaa);
    }
    else
    {   
     //System.out.println("dddd");
     int dialogResult =
     JOptionPane.showOptionDialog(
             NotePadExam.this,
           "변경된 내용을 저장하시겠습니까?",
           "새로만들기",
           JOptionPane.YES_NO_CANCEL_OPTION,
           JOptionPane.QUESTION_MESSAGE,
           null,msg,msg[0]
             );
    
     if(dialogResult == JOptionPane.YES_OPTION)   
      saveDoc(jtaa);//저장메소드
     else if(dialogResult == JOptionPane.NO_OPTION)//저장취소메소드
      createNewDoc(jtaa);//저장취소
     else //취소
      System.out.print("cancel");
     //저장하던 문서가 있는경우 저장,저장안함,취소 물어봄
    
    }
    //System.out.println("새로만들기 클릭했음");
   }
  };
  return al;
 }
 
 public void saveDoc(JTextArea jta)
 {
  NotePadJFileChooser jfChooser = new NotePadJFileChooser("저장");

  int returnVal = jfChooser.showOpenDialog(this);
  if(returnVal == JFileChooser.APPROVE_OPTION)
  {
   //System.out.println("You were choosen file what named " +jfChooser.getSelectedFile().getName());
   String savingFileName = jfChooser.getSelectedFile().getName();
   FileWriter fw = null;
   try
   {
    File choosenFileDirectory = new File(jfChooser.getCurrentDirectory().getAbsolutePath()+"\\"+savingFileName+".txt");

    //System.out.println(choosenFileDirectory.getAbsolutePath());
   
    fw = new FileWriter(choosenFileDirectory);
    fw.write(jta.getText());
    fw.close();
    this.setTitle(savingFileName);
   }
   catch (IOException ie)
   {
    ie.printStackTrace();
   }
  }
 
  //this.setTitle("안녕");//쓰불 타이틀 바꾼다고 몇시간 뻘짓 했넹..==;
  //StringBuffer strB = new StringBuffer(jta.getText());
 
 }
 /*
 public void fileWrite(InputStream in)
 {
  byte[] buffer = new byte[512];
  int readcount = 0;

  try
  {
   while((readcount = in.read(buffer)) != -1)
   {
    System.out.write(buffer,0,readcount);
   }
  }
  catch (IOException e)
  {
   System.out.println(e);
  }
 }
 */
 public void createNewDoc(JTextArea jtaa)
 {
//  if(jf==null)
//  setTitle("");
 
  //super.setTitle("새로만들기");
  //setTitle2("새로만들자");
  this.setTitle("제목없음");
  jtaa.setText("");

 }
 public JMenuItem createMenuItem(JMenu jmu,String name2)
 {
  //System.out.println("111111111");
  JMenuItem jmui = new JMenuItem(name2); 
  jmu.add(jmui);
  return jmui;
 }
 public static void main(String[] args)
 {
  NotePadExam npe = new NotePadExam();
  npe.setSize(500,500);
  npe.setVisible(true);

 //System.out.println("Hello World!");
 }
}
class NotePadJFileChooser extends JFileChooser
{
 //JFileChooser jfChooser;
 FileNameExtensionFilter filter;

 public NotePadJFileChooser(String buttonName)
 {
  super();
  filter =  new FileNameExtensionFilter(
          "텍스트 문서(*.txt)"
          ,"txt"
          );
  this.setFileFilter(filter);
  this.setApproveButtonText(buttonName);
  this.setApproveButtonToolTipText(buttonName);

 }
 /*
 JFileChooser jfChooser = new JFileChooser();
  FileNameExtensionFilter filter =
  jfChooser.setFileFilter(filter);
  jfChooser.setApproveButtonText("저장");
  jfChooser.setApproveButtonToolTipText("저장하기");
  int returnVal = jfChooser.showOpenDialog(this);
 */
}