1 Official Tutorial

2 멋진 링크

3 ibm's eclipse

4 JavaOS - JNode

5 java file io

6 java 로 MD5 구하기

7 jdbc

8 Swing

8.1 JFrame 이 닫힐 때 프로그램 종료하기

8.2 MessageBox 띄우기

8.3 checkbox 쓰기

9 Eclipse & SWT

9.1 Swing 과 AWT 의 차이

9.2 Web Browser

10 Game Programming

10.1 전체 화면 만들기

11 Java WebStart

12 Data Type Converting

13 기타

13.1 JRE Auto Install

13.2 특정 url 의 파일 받아오기

13.3 html 파일에서 각종 tag 없애기

13.4 java 에서 클립보드의 문자열 받아오기

13.5 java 에서 mp3 play

13.6 JFree Software

13.7 Native Code 로 컴파일하기

13.8 JScrollPane 밑의 JTextarea 에서 스크롤바가 작동을 안 할 때

13.9 javaWebStart 없는데 알아서 설치하기 html version

13.10 java 에서 shell 명령 내리기

14 기타

14.1 자바로 시리얼 통신하기

14.2 jar 파일에 대해서

14.3 Converting Flash Movies to MIDlets

14.4 JWS 를 이용한 JRE 설치하기

• http://www.redwiki.net/wiki/wiki.php/Java
  
  

   public static void main(String[] args)
    {
        FileReader reader;
        try
        {
            reader = new FileReader("temp.txt");

            char[] buffer = new char[256];

            int i = 0;

            i = reader.read(buffer, 0, 256);
            if (0 == i)
            {
                System.out.println("Can't read the file");
            }
            else
            {
                String k = new String(buffer);
                k = k.substring(0, i);
                System.out.println(k);

                StringBuffer hexString = new StringBuffer();
                try
                {
                    MessageDigest algorithm = MessageDigest.getInstance("MD5");
                    algorithm.reset();
                    algorithm.update(k.getBytes());

                    byte[] digest = algorithm.digest();

                    for (i = 0; i < digest.length; i++)
                    {
                        hexString.append(Integer.toHexString(0xff & digest[i]));
                    }
                }
                catch (Exception ex)
                {
                    ex.printStackTrace();
                    //return "";
                }

                k = hexString.toString();

                FileWriter writer = new FileWriter("output.txt");
                writer.write(k);
                writer.close();
            }

            reader.close();

        }
        catch (FileNotFoundException e)
        {
        }
        catch (IOException e)
        {
        }

    }

    public static String getMD5SUM(final String strOriginal)
    {
        StringBuffer hexString = new StringBuffer();
        try
        {
            MessageDigest algorithm = MessageDigest.getInstance("MD5");
            algorithm.reset();
            algorithm.update(strOriginal.getBytes());

            byte[] digest = algorithm.digest();

            for(int i=0; i< digest.length; i++)
            {
                hexString.append(Integer.toHexString(0xff & digest[i]));
            }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
            //return "";
        }

        return hexString.toString();
    }

/** The constructor expects the naming server URL and the context provider class. 
*    For example, the sample URL for ldap server on localhost can be 
*	ldap://localhost:389/ou=jdbc,cn=manager,dc=microsoft,dc=com,
*    and the provider class name can be com.sun.jndi.ldap.LdapCtxFactory		
*/ 
import com.microsoft.jdbcx.sqlserver.SQLServerDataSource;
import java.util.Hashtable;
import javax.naming.*;
import javax.naming.directory.*;
import javax.sql.*;
import java.sql.*;

public class JNDISetup
{
	
	
     Context ctx = null;
     String url;
     String factory;    
     JNDISetup(String url, String factory){
          this.url=url;
               this.factory=factory;    
          getContext();
     }
	
         private void getContext(){
          try{
               Hashtable env = new Hashtable();
               env.put(Context.INITIAL_CONTEXT_FACTORY, factory);
               env.put(Context.PROVIDER_URL, url);
               ctx = new InitialContext(env);
          }catch(Exception e){
               System.out.println("Error in SetupJNDI:getContext() "+e.getMessage());
               e.printStackTrace();
          }	
		
     }
     public boolean bindDataSource(String bindName)
         {
               boolean isRegistered =false;
                    try
                    {
                         SQLServerDataSource mds = new SQLServerDataSource();
                         mds.setDescription("MS SQLServerDataSource");
                         mds.setServerName("sqlserver");
                         mds.setPortNumber(1433);
                         mds.setDatabaseName("pubs");
                         mds.setSelectMethod("cursor");
                         ctx.rebind(bindName, mds);
                         System.out.println("Bind success");
                         isRegistered=true;
                    }
                         catch(Exception e)
                    {
                         System.out.println("Error Occured in JNDISetup:     " + e.getMessage());
                         e.printStackTrace();
                    }
                    return isRegistered;
                    } 
			
          public javax.sql.ConnectionPoolDataSource getDataSource(String bindName){
			
               javax.sql.ConnectionPoolDataSource ds = null;
			
               try{							
                         ds = (javax.sql.ConnectionPoolDataSource) ctx.lookup(bindName);
               }catch(Exception e){
                    System.out.println("Error in JNDISetup:getDataSource() : "+e.getMessage());
                    e.printStackTrace();
               }
               return ds;
			
          }
}		

import java.*;
public class Connect{
     private java.sql.Connection  con = null;
     private final String url = "jdbc:microsoft:sqlserver://";
     private final String serverName= "localhost";
     private final String portNumber = "1433";
     private final String databaseName= "pubs";
     private final String userName = "user";
     private final String password = "password";
     // Informs the driver to use server a side-cursor, 
     // which permits more than one active statement 
     // on a connection.
     private final String selectMethod = "cursor"; 
     
     // Constructor
     public Connect(){}
     
     private String getConnectionUrl(){
          return url+serverName+":"+portNumber+";databaseName="+databaseName+";selectMethod="+selectMethod+";";
     }
     
     private java.sql.Connection getConnection(){
          try{
               Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver"); 
               con = java.sql.DriverManager.getConnection(getConnectionUrl(),userName,password);
               if(con!=null) System.out.println("Connection Successful!");
          }catch(Exception e){
               e.printStackTrace();
               System.out.println("Error Trace in getConnection() : " + e.getMessage());
         }
          return con;
      }

     /*
          Display the driver properties, database details 
     */ 

     public void displayDbProperties(){
          java.sql.DatabaseMetaData dm = null;
          java.sql.ResultSet rs = null;
          try{
               con= this.getConnection();
               if(con!=null){
                    dm = con.getMetaData();
                    System.out.println("Driver Information");
                    System.out.println("tDriver Name: "+ dm.getDriverName());
                    System.out.println("tDriver Version: "+ dm.getDriverVersion ());
                    System.out.println("nDatabase Information ");
                    System.out.println("tDatabase Name: "+ dm.getDatabaseProductName());
                    System.out.println("tDatabase Version: "+ dm.getDatabaseProductVersion());
                    System.out.println("Avalilable Catalogs ");
                    rs = dm.getCatalogs();
                    while(rs.next()){
                         System.out.println("tcatalog: "+ rs.getString(1));
                    } 
                    rs.close();
                    rs = null;
                    closeConnection();
               }else System.out.println("Error: No active Connection");
          }catch(Exception e){
               e.printStackTrace();
          }
          dm=null;
     }     
     
     private void closeConnection(){
          try{
               if(con!=null)
                    con.close();
               con=null;
          }catch(Exception e){
               e.printStackTrace();
          }
     }
     public static void main(String[] args) throws Exception
       {
          Connect myDbTest = new Connect();
          myDbTest.displayDbProperties();
       }
}

/*				
이 코드가 성공적으로 실행되면 다음과 비슷하게 출력됩니다. 

Connection Successful!
Driver Information
        Driver Name: SQLServer
        Driver Version: 2.2.0022

Database Information
        Database Name: Microsoft SQL Server
        Database Version: Microsoft SQL Server  2000 - 8.00.384 (Intel X86)
        May 23 2001 00:02:52
        Copyright (c) 1988-2000 Microsoft Corporation
        Desktop Engine on Windows NT 5.1 (Build 2600: )

Avalilable Catalogs
        catalog: master
        catalog: msdb
        catalog: pubs
        catalog: tempdb


*/

public void itemStateChanged(java.awt.event.ItemEvent e)
{
        m_frame.setAlwaysOnTop(e.getStateChange() == ItemEvent.SELECTED);
}

• EclipseSWT FAQ
  
  
• RichClientProgram
  
  

/*
 * Created on 2004. 4. 17.
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
/**
 * @author zelon
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
import org.eclipse.swt.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.browser.*;

public class Browser01 {
	public static void amain(String [] args) {
	//	public static void main(String [] args) {
		Display display = new Display();
		final Shell shell = new Shell(display);
		
		
		GridLayout gridLayout = new GridLayout();
		gridLayout.numColumns = 3;
		shell.setLayout(gridLayout);
		
		ToolBar toolbar = new ToolBar(shell, SWT.NONE);
		ToolItem itemBack = new ToolItem(toolbar, SWT.PUSH);
		itemBack.setText("Back");
		ToolItem itemForward = new ToolItem(toolbar, SWT.PUSH);
		itemForward.setText("Forward");
		ToolItem itemStop = new ToolItem(toolbar, SWT.PUSH);
		itemStop.setText("Stop");
		ToolItem itemRefresh = new ToolItem(toolbar, SWT.PUSH);
		itemRefresh.setText("Refresh");
		ToolItem itemGo = new ToolItem(toolbar, SWT.PUSH); 
		itemGo.setText("Go");
		
		GridData data = new GridData();
		data.horizontalSpan = 3;
		toolbar.setLayoutData(data);

		Label labelAddress = new Label(shell, SWT.NONE);
		labelAddress.setText("Address");
		
		final Text location = new Text(shell, SWT.BORDER);
		data = new GridData();
		data.horizontalAlignment = GridData.FILL;
		data.horizontalSpan = 2;
		data.grabExcessHorizontalSpace = true;
		location.setLayoutData(data);

		final Browser browser = new Browser(shell, SWT.NONE);
		data = new GridData();
		data.horizontalAlignment = GridData.FILL;
		data.verticalAlignment = GridData.FILL;
		data.horizontalSpan = 3;
		data.grabExcessHorizontalSpace = true;
		data.grabExcessVerticalSpace = true;
		browser.setLayoutData(data);

		final Label status = new Label(shell, SWT.NONE);
		data = new GridData(GridData.FILL_HORIZONTAL);
		data.horizontalSpan = 2;
		status.setLayoutData(data);

		final ProgressBar progressBar = new ProgressBar(shell, SWT.NONE);
		data = new GridData();
		data.horizontalAlignment = GridData.END;
		progressBar.setLayoutData(data);

		/* event handling */
		Listener listener = new Listener() {
			public void handleEvent(Event event) {
				ToolItem item = (ToolItem)event.widget;
				String string = item.getText();
				if (string.equals("Back")) browser.back(); 
				else if (string.equals("Forward")) browser.forward();
				else if (string.equals("Stop")) browser.stop();
				else if (string.equals("Refresh")) browser.refresh();
				else if (string.equals("Go")) browser.setUrl(location.getText());
		   }
		};
		browser.addProgressListener(new ProgressListener() {
			public void changed(ProgressEvent event) {
					if (event.total == 0) return;                            
					int ratio = event.current * 100 / event.total;
					progressBar.setSelection(ratio);
			}
			public void completed(ProgressEvent event) {
				progressBar.setSelection(0);
			}
		});
		browser.addStatusTextListener(new StatusTextListener() {
			public void changed(StatusTextEvent event) {
				status.setText(event.text);	
			}
		});
		browser.addLocationListener(new LocationListener() {
			public void changed(LocationEvent event) {
				location.setText(event.location);
			}
			public void changing(LocationEvent event) {
			}
		});
		itemBack.addListener(SWT.Selection, listener);
		itemForward.addListener(SWT.Selection, listener);
		itemStop.addListener(SWT.Selection, listener);
		itemRefresh.addListener(SWT.Selection, listener);
		itemGo.addListener(SWT.Selection, listener);
		location.addListener(SWT.DefaultSelection, new Listener() {
			public void handleEvent(Event e) {
				browser.setUrl(location.getText());
			}
		});
		
		shell.open();
		browser.setUrl("http://www.wimy.com");
		
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
		display.dispose();
	}
}

/*
 * Created on 2004. 6. 15.
 *
 * 
 */

import org.eclipse.swt.widgets.*;
import org.eclipse.swt.browser.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.*;

/**
 * @author Zelon
 * 
 * 가장 간단한 브라우저를 띄우는 클래스
 * 
 */
public class ZBrowser
{
	public void ShowBrowser()
	{
		Display display = new Display();
		final Shell shell = new Shell(display);
		
		GridLayout gridLayout = new GridLayout();
		gridLayout.numColumns = 1;
		shell.setLayout(gridLayout);

		Browser a = new Browser(shell, SWT.NONE);
		
		GridData data = new GridData();
		data.horizontalAlignment = GridData.FILL;
		data.verticalAlignment = GridData.FILL;
		data.horizontalSpan = 3;
		data.grabExcessHorizontalSpace = true;
		data.grabExcessVerticalSpace = true;
		a.setLayoutData(data);

		
		a.setUrl("http://www.wimy.com");
		shell.open();
		
		while (!shell.isDisposed())
		{
			if (!display.readAndDispatch())
			{
				display.sleep();
			}
		}
		display.dispose();
	}
}

-Djava.library.path={runtime-library-path}

ex)
-Djava.library.path="C:Program Fileseclipsepluginsorg.eclipse.swt.win32_3.0.0oswin32x86"

GraphicsDevice dev = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
GraphicsConfiguration gc = dev.getDefaultConfiguration();
DisplayMode mode = new DisplayMode(800, 600, 32, DisplayMode.REFRESH_RATE_UNKNOWN);
JFrame frame = new JFrame(gc);
frame.setUndecorated(true);
frame.setIgnoreRepaint(true);
frame.show();
dev.setFullScreenWindow(frame);
if(dev.isDisplayChangeSupported()) dev.setDisplayMode(mode);
//frame.createBufferStrategy(numBuffers);
frame.createBufferStrategy(2);
BufferStrategy bufferStrategy = frame.getBufferStrategy(); 

<html>
<body onload="loadYourApplication()">
<script language="JavaScript1.2">
function isJWSInstalled()
{
  	var javawsInstalled = 0;
  	isIE = "false";
  	
  	if (navigator.mimeTypes && navigator.mimeTypes.length)
  	{
  		x = navigator.mimeTypes['application/x-java-jnlp-file'];
  		if (x) javawsInstalled = 1;
  	}
  	else
  	{
  		isIE = "true";
  	}
  	
  	if(isIE == "true")
  	{
  		return VBisJWSInstalled();
  	}
  	else return javawsInstalled;
}
</script>

<SCRIPT LANGUAGE="VBScript">
FUNCTION VBisJWSInstalled()
	on error resume next
	If Not(IsObject(CreateObject("JavaWebStart.IsInstalled"))) Then
		VBisJWSInstalled = 0
	Else
		VBisJWSInstalled = 1
	End If
END FUNCTION
</SCRIPT>

<script language="JavaScript">
// this function checks the JWS installation and if yes then launches the application
function loadYourApplication()
{
	if(isJWSInstalled() != 1)
	{
		if(window.confirm("Java Web Start is not installed on your computer. To run Your Application you need to install it. Do you want to proceed installing Java Web Start"))    
		{
			// download the java web start installation exe from sun website. This contains the JRE also so you dont have to worry about that.	
			document.location.href ='http://aurl/jws.exe';
		}
	}
	else
	{
		// call a URL which is actually a JNLP file. Java Web Start application is launched. 
		alert("ok");
	}
}
</script>



</body>
</html>

• byte[] -> String : new String(byte[])
  
  
• char[] -> String : String(static).copyValueOf()
  
  
  

	String GetHtmlSource(String strUrl)
	{
		String ret = "";
		URL url;
		try
		{
			url = new URL(strUrl);
			URLConnection con = url.openConnection();

			InputStream in = url.openStream();

			BufferedReader br = new BufferedReader(new InputStreamReader(in));

			String strLine;
			
			while (( strLine = br.readLine())!= null)
			{
				ret += strLine;
			}
		}
		catch (MalformedURLException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		catch ( IOException ex )
		{
		}
		
		return ret;
}

strOri = strOri.replaceAll("<.*?>","");

					Clipboard clipboard = getToolkit().getSystemClipboard();
					Transferable tf = clipboard.getContents(this);
					
					if ( tf != null )
					{
						try
						{
							m_tfResult.setText((String)tf.getTransferData(DataFlavor.stringFlavor));
						}
						catch (UnsupportedFlavorException e1)
						{
							// TODO Auto-generated catch block
							e1.printStackTrace();
						}
						catch (IOException e1)
						{
							// TODO Auto-generated catch block
							e1.printStackTrace();
						}
					}

<html>
<body onload="loadYourApplication()">
<script language="JavaScript1.2">
function isJWSInstalled()
{
  	var javawsInstalled = 0;
  	isIE = "false";
  	
  	if (navigator.mimeTypes && navigator.mimeTypes.length)
  	{
  		x = navigator.mimeTypes['application/x-java-jnlp-file'];
  		if (x) javawsInstalled = 1;
  	}
  	else
  	{
  		isIE = "true";
  	}
  	
  	if(isIE == "true")
  	{
  		return VBisJWSInstalled();
  	}
  	else return javawsInstalled;
}
</script>

<SCRIPT LANGUAGE="VBScript">
FUNCTION VBisJWSInstalled()
	on error resume next
	If Not(IsObject(CreateObject("JavaWebStart.IsInstalled"))) Then
		VBisJWSInstalled = 0
	Else
		VBisJWSInstalled = 1
	End If
END FUNCTION
</SCRIPT>

<script language="JavaScript">
// this function checks the JWS installation and if yes then launches the application
function loadYourApplication()
{
	if(isJWSInstalled() != 1)
	{
		if(window.confirm("Java Web Start is not installed on your computer.
 To run Your Application you need to install it.
 Do you want to proceed installing Java Web Start"))    
		{
			// download the java web start installation exe from sun website. This contains the JRE also so you dont have to worry about that.	
			document.location.href ='http://aurl/jws.exe';
		}
	}
	else
	{
		// call a URL which is actually a JNLP file. Java Web Start application is launched. 
		alert("ok");
	}
}
</script>



</body>
</html>

import java.io.*;

class  ExTelnet
{
    public static void main(String[] args)
    {
        try
        {
            String [] cmd = {"cmd.exe","/c","start telnet oxen.konkuk.ac.kr"};
            Process m ;
            String S = "" ;

            m = Runtime.getRuntime().exec(cmd) ;

            BufferedReader in =
            new BufferedReader(new InputStreamReader(
            m.getInputStream()));

            while((S=in.readLine()) != null)
            {
                System.out.println(S) ;
            }

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

} 

안녕하세요..

java web start 를 사용해서 어플리케이션을 배포 하고 있습니다.
다름이 아니오라 사용자가 어플리케이션을 실행할때 jre 를 자동으로 다운로드 받게
하고 싶습니다. 물론 jre 설치가 안되어 있는 PC 상에서 말입니다.
지금은 1.4.2_04 버전을 사용하고 있습니다.

애플릿을 배포 할때 object 태그를 사용해서 jre 를 자동으로 다운 받드시 
java web start 도 실행 할때 자동으로 다운 받고 하고 싶습니다.

경험 있으신 분의 조언 부탁 드립니다.

제목 : Re: 참고 URL 입니다.
  글쓴이: 손님(guest)   2004/03/23 14:56:04  조회수:33  줄수:8

	


http://www.javastudy.co.kr/docs/okshin/JavaWebStart.htm#_Toc504213900




이곳은 위의 소스가 적용되어 있는곳입니다.


http://wilab.inha.ac.kr/ivj/