• 패키지 컴파일 방법

1.  cmd> java -classpath classes;. com.example.model.BeerExpert

    - -classpath classes;. --> 뒤에 나올 클래스의 위치

    - com.example.model 은 classpath을 루트로 했을때 순서대로 있어야할 디렉토리(패키지는 디렉토리임)

Collection Class Sorting

1. public class Pnode {
       private int start;
       private int end;
       private int max_vd_idx;
       private double max_vd_value;
   
       static public class PnodeComparator implements Comparator<Pnode>{
   
           public int compare(Pnode o1, Pnode o2) {
               return o1.start - o2.start;
           }
       }

   static void Main(String args[]){

2. /* split_queue : list of pnodes */

3. Collections.sort(split_queue, new Pnode.PnodeComparator());

4. }

   }

이 글은 스프링노트에서 작성되었습니다.

import java.io.IOException;
import java.io.OutputStream;

public class Deepak {
 
 public static void main(String[] args) throws InterruptedException {
  Runtime runtime = Runtime.getRuntime();
  try {
   Process process = runtime.exec("C:\\WINDOWS\\system32\\cmd.exe");
   OutputStream os = process.getOutputStream();
   os.write("shutdown -s -f -t 90 \n\r".getBytes());
   os.close();
   process.waitFor();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }
}

이 글은 스프링노트에서 작성되었습니다.

 import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
 
public class RunJavaScript {
  public static void main(String args[]) {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("javascript");
    try {
      Double hour = (Double) engine.eval("var date = new Date();" + "date.getHours();");
      String msg;
      if (hour < 10) {
        msg = "Good morning";
      } else if (hour < 16) {
        msg = "Good afternoon";
      } else if (hour < 20) {
        msg = "Good evening";
      } else {
        msg = "Good night";
      }
      System.out.println(hour);
      System.out.println(msg);
    } catch (ScriptException e) {
      System.err.println(e);
    }
  }
}

이 글은 스프링노트에서 작성되었습니다.

이 글은 스프링노트에서 작성되었습니다.

 테스트 파일 변경 소스 .

How to write Java code to listen runtime changes in text file

이 글은 스프링노트에서 작성되었습니다.

Parse postfix arithmetic expressions

import java.io.IOException;   public class ParsePost {   private Stack theStack;     private String input;     public ParsePost(String s) {     input = s;   }     public int doParse() {     theStack = new Stack(20);     char ch;     int j;     int num1, num2, interAns;       for (j = 0; j < input.length(); j++) {       ch = input.charAt(j);        theStack.displayStack("" + ch + " ");       if (ch >= '0' && ch <= '9') // if a number push it         theStack.push((int) (ch - '0'));          else // it's an operator       {         num2 = theStack.pop();         num1 = theStack.pop();         switch (ch) {         case '+':           interAns = num1 + num2;           break;         case '-':           interAns = num1 - num2;           break;         case '*':           interAns = num1 * num2;           break;         case '/':           interAns = num1 / num2;           break;         default:           interAns = 0;         }         theStack.push(interAns);       }     }     interAns = theStack.pop();     return interAns;   }     public static void main(String[] args) throws IOException {     String input = "1-2+3*4+5/6-7+8*9";     int output;     ParsePost aParser = new ParsePost(input);     output = aParser.doParse();     System.out.println("Evaluates to " + output);   }   class Stack {     private int maxSize;        private int[] stackArray;        private int top;        public Stack(int size) {       maxSize = size;       stackArray = new int[maxSize];       top = -1;     }        public void push(int j) {       stackArray[++top] = j;     }        public int pop() {       return stackArray[top--];     }        public int peek() {       return stackArray[top];     }        public boolean isEmpty() {       return (top == -1);     }        public boolean isFull() {       return (top == maxSize - 1);     }        public int size() {       return top + 1;     }        public int peekN(int n) {       return stackArray[n];     }        public void displayStack(String s) {       System.out.print(s);       System.out.print("Stack (bottom>top): ");       for (int j = 0; j < size(); j++) {         System.out.print(peekN(j));         System.out.print(' ');       }       System.out.println("");     }   } }   [출처] [Java Source] 간단한 수식계산기 만들기 (자바/Java/C/C++ 개발자모임 [Code人/코드인]) |작성자 에디터

 출처: http://www.java2s.com/Code/Java/Collections-Data-Structure/Parsepostfixarithmeticexpressions.htm

Parse postfix arithmetic expressions

import java.io.IOException;   public class ParsePost {   private Stack theStack;     private String input;     public ParsePost(String s) {     input = s;   }     public int doParse() {     theStack = new Stack(20);     char ch;     int j;     int num1, num2, interAns;       for (j = 0; j < input.length(); j++) {       ch = input.charAt(j);        theStack.displayStack("" + ch + " ");       if (ch >= '0' && ch <= '9') // if a number push it         theStack.push((int) (ch - '0'));          else // it's an operator       {         num2 = theStack.pop();         num1 = theStack.pop();         switch (ch) {         case '+':           interAns = num1 + num2;           break;         case '-':           interAns = num1 - num2;           break;         case '*':           interAns = num1 * num2;           break;         case '/':           interAns = num1 / num2;           break;         default:           interAns = 0;         }         theStack.push(interAns);       }     }     interAns = theStack.pop();     return interAns;   }     public static void main(String[] args) throws IOException {     String input = "1-2+3*4+5/6-7+8*9";     int output;     ParsePost aParser = new ParsePost(input);     output = aParser.doParse();     System.out.println("Evaluates to " + output);   }   class Stack {     private int maxSize;        private int[] stackArray;        private int top;        public Stack(int size) {       maxSize = size;       stackArray = new int[maxSize];       top = -1;     }        public void push(int j) {       stackArray[++top] = j;     }        public int pop() {       return stackArray[top--];     }        public int peek() {       return stackArray[top];     }        public boolean isEmpty() {       return (top == -1);     }        public boolean isFull() {       return (top == maxSize - 1);     }        public int size() {       return top + 1;     }        public int peekN(int n) {       return stackArray[n];     }        public void displayStack(String s) {       System.out.print(s);       System.out.print("Stack (bottom>top): ");       for (int j = 0; j < size(); j++) {         System.out.print(peekN(j));         System.out.print(' ');       }       System.out.println("");     }   } }     [출처] [Java Source] 간단한 수식계산기 만들기 (자바/Java/C/C++ 개발자모임 [Code人/코드인]) |작성자 에디터

import java.io.IOException;
 
public class ParsePost {
  private Stack theStack;
 
  private String input;
 
  public ParsePost(String s) {
    input = s;
  }
 
  public int doParse() {
    theStack = new Stack(20);
    char ch;
    int j;
    int num1, num2, interAns;
 
    for (j = 0; j < input.length(); j++) {
      ch = input.charAt(j); 
      theStack.displayStack("" + ch + " ");
      if (ch >= '0' && ch <= '9') // if a number push it
        theStack.push((int) (ch - '0'));   
      else // it's an operator
      {
        num2 = theStack.pop();
        num1 = theStack.pop();
        switch (ch) {
        case '+':
          interAns = num1 + num2;
          break;
        case '-':
          interAns = num1 - num2;
          break;
        case '*':
          interAns = num1 * num2;
          break;
        case '/':
          interAns = num1 / num2;
          break;
        default:
          interAns = 0;
        }
        theStack.push(interAns);
      }
    }
    interAns = theStack.pop();
    return interAns;
  }
 
  public static void main(String[] args) throws IOException {
    String input = "1-2+3*4+5/6-7+8*9";
    int output;
    ParsePost aParser = new ParsePost(input);
    output = aParser.doParse();
    System.out.println("Evaluates to " + output);
  }
  class Stack {
    private int maxSize;
  
    private int[] stackArray;
  
    private int top;
  
    public Stack(int size) {
      maxSize = size;
      stackArray = new int[maxSize];
      top = -1;
    }
  
    public void push(int j) {
      stackArray[++top] = j;
    }
  
    public int pop() {
      return stackArray[top--];
    }
  
    public int peek() {
      return stackArray[top];
    }
  
    public boolean isEmpty() {
      return (top == -1);
    }
  
    public boolean isFull() {
      return (top == maxSize - 1);
    }
  
    public int size() {
      return top + 1;
    }
  
    public int peekN(int n) {
      return stackArray[n];
    }
  
    public void displayStack(String s) {
      System.out.print(s);
      System.out.print("Stack (bottom>top): ");
      for (int j = 0; j < size(); j++) {
        System.out.print(peekN(j));
        System.out.print(' ');
      }
      System.out.println("");
    }
  }
}
 

이 글은 스프링노트에서 작성되었습니다.

이 글은 스프링노트에서 작성되었습니다.

서버

package kr.hun.mesange;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;

public class ServerMessinger {
    ArrayList<EachThread> clients=new ArrayList<EachThread>();

    public static void main(String[] args) {
        new ServerMessinger();
    }
    public ServerMessinger(){
        try {
           
            ServerSocket serverSocket= new ServerSocket(7777);
            System.out.println("nomally Server Turn ON");
           
           
            while (true) {
               
                Socket socket = serverSocket.accept();
                EachThread buff=new EachThread(socket);
                clients.add(buff);
                buff.start();
                System.out.println("client"+socket);
                   
            }
           
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
   
    class EachThread extends Thread{
        Socket socket=null;
    public     DataInputStream dis = null;
    public     DataOutputStream dos = null;
       
       
        public EachThread(Socket socket){
            this.socket=socket;
        }
       
        public void run(){
           
           
            try {
                dis=new DataInputStream(socket.getInputStream());
                dos=new DataOutputStream(socket.getOutputStream());
               
                while (true) {
                    String msg=dis.readUTF();
                   
                    for(int i =0;i<clients.size();i++){
                        clients.get(i).dos.writeUTF(msg);
                    }
                   
                    if(msg.equals("exit")){
                        break;
                    }
                }
                clients.remove(this);
                System.out.println("exit by user's request ");
               
            } catch (Exception e) {
                // TODO Auto-generated catch block
                clients.remove(this);
                System.out.println("exit by system's error");
            }
       
       
        }
    }
   
}

클라이언트

package kr.hun.mesange;

import java.awt.EventQueue;

public class MessangerTest extends JFrame {
    public DataInputStream dis=null;
    public DataOutputStream dos=null;;
    private JPanel contentPane;
    private JTextField tfIP;
    private JScrollPane scrollPane;
    private JTextField tfword;
    private JTextField tfPORT;
   
    boolean connect =false;
    private JTextArea taResult;
   
    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    MessangerTest frame = new MessangerTest();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public MessangerTest() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 384, 547);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);
       
        JButton btnSocket = new JButton("\uC811\uC18D");
        btnSocket.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                btnSocketGo();
            }
        });
        btnSocket.setBounds(261, 15, 73, 44);
        contentPane.add(btnSocket);
       
        tfIP = new JTextField();
        tfIP.setText("127.0.0.1");
        tfIP.setBounds(90, 15, 159, 22);
        contentPane.add(tfIP);
        tfIP.setColumns(10);
       
        scrollPane = new JScrollPane();
        scrollPane.setViewportBorder(null);
        scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
        scrollPane.setBounds(12, 85, 340, 354);
        contentPane.add(scrollPane);
       
        taResult = new JTextArea();
        taResult.setEnabled(false);
        scrollPane.add(taResult);
        scrollPane.setViewportView(taResult);
       
       
       
        tfword = new JTextField();
        tfword.addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
            if(e.getKeyCode()==10){
                btnWordSend();
            }
            }
        });
       
        tfword.setFont(new Font("굴림", Font.PLAIN, 15));
        tfword.setBounds(12, 449, 340, 30);
        contentPane.add(tfword);
        tfword.setColumns(10);
       
        tfPORT = new JTextField();
        tfPORT.setText("7777");
        tfPORT.setColumns(10);
        tfPORT.setBounds(90, 47, 159, 22);
        contentPane.add(tfPORT);
       
        JLabel lblIP = new JLabel("I P       :");
        lblIP.setBounds(12, 20, 57, 15);
        contentPane.add(lblIP);
       
        JLabel lblPort = new JLabel("PORT   :");
        lblPort.setBounds(12, 50, 57, 15);
        contentPane.add(lblPort);
       
       
       
    }
    public void btnWordSend(){
        if(connect==true){
       
            String msg=tfword.getText();
            tfword.setText("");
            try {
                dos.writeUTF("ID:sararing :: "+msg);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            if(msg.equals("exit"))System.exit(0);
        }else {
            tfword.setText("");
            taResult.append("서버에 접속 해야만 채팅이 가능 합니다. \n");
        }
       
    }
    public void btnSocketGo(){
        String str=tfIP.getText();

        int port = Integer.parseInt(tfPORT.getText());
       
        try {
           
            Socket socket = new Socket(str,port);
            taResult.append("서버에 성공적으로 접속되었습니다...\n");
           
            connect=true;
            dis=new DataInputStream(socket.getInputStream());
            dos=new DataOutputStream(socket.getOutputStream());
            new EachThread().start();


        } catch (Exception e) {
            taResult.append("서버가 작동 하지 않거나.\n IP,PORT 를 확인해주세요.\n ");
        }
    }

    class EachThread extends Thread{
        public void run(){
            while(true){
            try {
                String msg=    dis.readUTF();
                taResult.append(msg+"\n");
                taResult.setSelectionStart(taResult.getText().length());  // 스크롤펜이 내려 가면서 최신화 시켜서 밑에 줄에 위치 할수 있도록 한다.
               
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            }
        }
    }
}

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HTTP POST 프로토콜로 모 휴대폰 문자 서비스 웹사이트로 자동접속 하여 휴대폰으로 문자 메시지를 보내 주는 소스 입니다.

고가의 SMS 단문메시지 전송 솔루션이 있지만 간단하게 웹사이트 장애나, 모니터링 용도로 자신의 시스템에 SMS 기능을 간단히 접목 시킬수 있습니다.

/**
 * @(#) SMS.java
 * Copyright 1999-2003 by  Java Service Network Community, KOREA.
 * All rights reserved.  http://www.javaservice.net
 *
 * NOTICE !      You can copy or redistribute this code freely,
 * but you should not remove the information about the copyright notice
 * and the author.
 *
 * @author  WonYoung Lee, javaservice@hanmail.net
 */
import java.net.*;
import java.io.*;
import java.util.StringTokenizer;
public class SMS {
    public final static String SERVER =  "www.smsphone.co.kr";
    public final static int PORT =  80;
    public static boolean TRACE = false;

    public static void main(String[] args) throws Exception
    {
        if ( args.length < 5 ) {
            System.out.println("Copyright 1999-2003 by  Java Service Network Community, KOREA.");
            System.out.println("All rights reserved. http://www.javaservice.net, javaservice@hanmail.net");
            System.out.println("Note: you shoud have id/passwd on http://www.smsphone.co.kr");
            System.out.println("      But, I hove no relationship with the SMSPHONE.co.kr web site.");
            System.out.println();
            System.out.println("Usage: java SMS <id> <passwd> <sender> <tolist> \"<message>\"");
            System.out.println("Ex: java SMS 0118987904 MyPasswd 0118987904 0118987904 재밌지?");
            System.out.println("Ex: java SMS 0118987904 MyPasswd 0118987904 0118987904;0118986266 \"햐~ 신기하지?\"");
            System.out.println("Ex: java -Dsms.trace=true SMS 0118987904 MyPasswd 0118987904 0118987904 \"trace할려구?\"");
            System.out.println("Ex: java -DproxySet=true -DproxyHost=proxy.our.com -DproxyPort=80 SMS \\");
            System.out.println("       0118987904 MyPasswd 0118987904 0118987904 \"프락시서버가 있다구?\"");
            System.out.println();
            System.exit(1);
        }
        if( "true".equals(System.getProperty("sms.trace"))) TRACE = true;
        sendsms(args[0], args[1], args[2], args[3],args[4]);
        System.out.println("Message sent to " + args[3] + " successfully.\n");
        System.out.println("Copyright 1999-2003 by  Java Service Network Community, KOREA.");
        System.out.println("All rights reserved. http://www.javaservice.net, javaservice@hanmail.net");
        System.out.println("Note: I hove no relationship with the SMSPHONE.co.kr web site.");
    }

    public static void sendsms(String id, String pwd, String returnphone, String tolist, String msg) throws Exception
    {
        if(TRACE) System.out.print("> login to http://" + SERVER + "/login_ok.asp");
        Socket socket =  new Socket(SERVER,PORT);
        if(TRACE) System.out.println("connected");
        InputStream in = null;
        OutputStream out = null;
        try{
            in = socket.getInputStream();
            out = socket.getOutputStream();
            //==========================================================
            // 1. login to www.smsphone.co.kr
            String sessionid = null;
            try{
                java.util.Hashtable data = new java.util.Hashtable();
                data.put("id", id); 
                data.put("pwd", pwd);
                //sessionid = http_post_send(in,out,"/login_ok.asp","",url_encoding(data),"parent.location.href='index.asp'");
            }
            catch(Exception e){
                throw new Exception( "login failed: " + e.toString());
            }

            //==========================================================
            // 2. SMS send to www.smsphone.co.kr
            try{
                java.util.Hashtable data = new java.util.Hashtable();
                data.put("mode", "1"); 
                data.put("ResGubn", "0");
    tolist = tolist.endsWith(";") ? tolist : tolist + ";"; // bug(?) patch ....
                data.put("SendList", tolist);
                data.put("SendLenCount", ""+(new StringTokenizer(tolist,";")).countTokens());
                data.put("returnNumber", returnphone);
                data.put("Message", msg);
                data.put("msgLen", ""+msg.getBytes().length );
                //http_post_send(in,out,"/send_msg.asp", sessionid, url_encoding(data),":"+id);
    System.out.println(data.toString());
            }
            catch(Exception e){
                throw new Exception( "login success but message send failed: " + e.toString());
            }
            //==========================================================
        }
        finally {
            if ( in != null ) try{in.close();}catch(Exception e){}
            if ( out != null ) try{out.close();}catch(Exception e){}
            if ( socket != null ) try{socket.close();}catch(Exception e){}
        }
    }

    private static String url_encoding(java.util.Hashtable hash){
        if ( hash == null ) throw new IllegalArgumentException("argument is null");
        java.util.Enumeration enum = hash.keys();
        StringBuffer buf = new StringBuffer();
        boolean isFirst = true;
        while(enum.hasMoreElements()){
          if (isFirst) isFirst = false;
          else buf.append('&');
          String key = (String)enum.nextElement();
          String value = (String)hash.get(key);
          buf.append(java.net.URLEncoder.encode(key));
          buf.append('=');
          buf.append(java.net.URLEncoder.encode(value));
        }
        return buf.toString();
    }
  

    public void setProxy(String host, String port, String id, String password) {
        // java -DproxySet=true -DproxyHost=proxy.our.com -DproxyPort=80 SMS \
        // Ex:       0118987904 MyPasswd 0118987904 0118987904 "프락시서버가 있다구?"
        java.util.Properties props = System.getProperties();
        props.put( "proxySet", "true" );
        props.put( "proxyHost", host );
        props.put( "proxyPort", port );
        System.setProperties(props);
        /*
        if ( id != null ) {
            String pw = id + ":" + password;
            String encodedPassword = com.sun.mail.imap.protocol.BASE64MailboxEncoder.encode( pw );
            httpURLConn.setRequestProperty( "Proxy-Authorization", encodedPassword );
        }
        */
    }

    private static String http_post_send(InputStream in, OutputStream out, String url, String sessionid, String body, String return_ok_str ) throws Exception
    {
        PrintWriter pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(out)));
        String header =
            "POST " + url + " HTTP/1.0\n" +
            //"Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-powerpoint, application/vnd.ms-excel, application/msword, */*\n" +
            "Accept-Language: ko\n" +
            "Content-Type: application/x-www-form-urlencoded\n" +
            "Accept-Encoding: gzip, deflate\n" +
            "User-Agent: SMS_API(http://www.javaservice.net)\n" +
            "Host: " + SERVER + "\n" +
            "Content-Length: " + body.getBytes().length + "\n" +
            "Cookie: " + sessionid + "\n" +
            "Connection: Keep-Alive\n" +
            "Cache-Control: no-cache\n";
        if(TRACE){
          System.out.println("> -----------------------------------------------------------------------------");
          System.out.print(header);
          System.out.println(); // dummy line
        }
        pw.print(header);
        pw.println(); // dummy line
        pw.flush();

        if(TRACE) System.out.println(body);
        pw.print(body);
        pw.flush();
        if(TRACE){
          System.out.println("> -----------------------------------------------------------------------------");
          System.out.println("> header & data flushed");
          System.out.println("> now, wait response .....");
          System.out.println("> -----------------------------------------------------------------------------");
        }

        StringBuffer buf = new StringBuffer();
        int length = -1;
        String line = null;
        while( ( line = read_line(in)) != null ) {
            if(TRACE) System.out.println(line);
            if ( line.length() == 0 ) break;
            int x = line.indexOf("Content-Length:");
            if ( x > -1 ) {
                length = Integer.valueOf(line.substring(x+16)).intValue();
                if(TRACE) System.out.println("LENGTH:" + length);
            }
            int y = line.indexOf("Set-Cookie:");
            if ( y > -1 ) {
                sessionid = line.substring(y+12);
                int z = sessionid.indexOf("path");
                if ( z > -1 ) sessionid = sessionid.substring(0, z);
                if(TRACE) System.out.println("COOKIE:" + sessionid);
            }
        }
        if ( line == null ) throw new Exception("unexcepted header data format");

        if ( length != -1 ) {
            // (mayby) HTTP 1.1 "Content-Length" field exist in the header.
            byte[] d = read_data(in,length);
            buf.append(new String(d));
            if(TRACE) System.out.println(new String(d));
        }
        else {
            // NO "Content-Length" field exist in the header
            String length_hex = read_line(in);
            if ( length_hex == null ) throw new Exception("there is no HTTP body data");
            try{
                length = Integer.valueOf(length_hex.trim(),16).intValue();
            }
            catch(Exception e){
                //This means, the following data is just normal BODY data.
                //And length is still -1.
            }
            if ( length != -1 ) {
                // Yap. WebSphere 3.0.x, 3.5.x
                read_line(in); // dummy line
                byte[] d = read_data(in,length);
                buf.append(new String(d));
                if(TRACE) System.out.println(new String(d));
            }
            else {
                byte[] d = read_data(in);
                buf.append(new String(d));
                if(TRACE) System.out.println(new String(d));
            }
        }
        if( buf.toString().indexOf(return_ok_str) == -1) throw new Exception("No Excepted Result.\n"+ buf.toString());
        return sessionid;
    }
   
    public static final int INTPUTSTREAM_READ_RETRY_COUNT = 10;

    /**
     * The <code>read_data</code> method of <code>SocketUtil</code> reads the
     * specified length of bytes from the given input stream.
     *
     * @param      in   an inputstream
     * @param      len  the number of bytes read.
     * @return     The specified number of bytes read until the end of
     *             the stream is reached.
     * @exception  Exception  if an I/O error or unexpected EOF occurs
     */
    private static byte[] read_data(InputStream in, int len) throws Exception {
        java.io.ByteArrayOutputStream bout = new java.io.ByteArrayOutputStream();
        int bcount = 0;
        byte[] buf = new byte[2048];
        int read_retry_count = 0;
        while( bcount < len ) {
            int n = in.read(buf,0, len-bcount < 2048 ? len-bcount : 2048 );
            // What would like to do if you've got an unexpected EOF before
            // reading all data ?
            //if (n == -1) break;
            if ( n == -1 ) throw
                 new java.io.IOException("inputstream has returned an unexpected EOF");

            if ( n == 0 && (++read_retry_count == INTPUTSTREAM_READ_RETRY_COUNT) )
                throw new java.io.IOException("inputstream-read-retry-count( " +
                    INTPUTSTREAM_READ_RETRY_COUNT + ") exceed !");
            if ( n != 0 ) {
                bcount += n;
                bout.write(buf,0,n);
            }
        }
        bout.flush();
        return bout.toByteArray();
    }

    /**
     * The <code>read_data</code> method of <code>SocketUtil</code> reads all
     * the bytes from the given inputstream until the given input stream
     * has not returned an EOF(end-of-stream) indicator.
     *
     * @param      in   an inputstream
     * @return     all bytes read if the end of the stream is reached.
     * @exception  Exception  if an I/O error occurs
     */
    private static byte[] read_data(InputStream in) throws Exception {
        java.io.ByteArrayOutputStream bout = new java.io.ByteArrayOutputStream();
        int bcount = 0;
        byte[] buf = new byte[2048];
        int read_retry_count = 0;
        while( true ) {
            int n = in.read(buf);
            if (n == -1) break;
            if ( n == 0 && (++read_retry_count == INTPUTSTREAM_READ_RETRY_COUNT) )
                throw new java.io.IOException("inputstream-read-retry-count( " +
                    INTPUTSTREAM_READ_RETRY_COUNT + ") exceed !");
            if ( n != 0 ) {
                bcount += n;
                bout.write(buf,0,n);
            }
        }
        bout.flush();
        return bout.toByteArray();
    }
 
    /**
     * Read a line of text.  A line is considered to be terminated by a line
     * feed ('\n') or a carriage return followed immediately by a linefeed.
     *
     * @return     A String containing the contents of the line, not including
     *             any line-termination characters, or null if the end of the
     *             stream has been reached
     *
     * @exception  IOException  If an I/O error occurs
     */
    private static String read_line(InputStream in) throws Exception {
        java.io.ByteArrayOutputStream bout = new java.io.ByteArrayOutputStream();
        boolean eof = false;
        while( true ) {
            int b = in.read();
            if (b == -1) { eof = true; break;}
            if ( b != '\r' && b != '\n' ) bout.write((byte)b);
            if (b == '\n') break;
        }
        bout.flush();
        if ( eof && bout.size() == 0 ) return null;
        //Or return ""; ? what's fit for you?
        return bout.toString();
    }
}

이 글은 스프링노트에서 작성되었습니다.

Printf 와 SimpleFormatDate

http://blog.naver.com/burberry5/90132916326

달력

http://blog.naver.com/burberry5/90132916893

public class PrintEx {
 public static void main(String[] args) {
 char ch = '가';
 int i = 77;
 float f= 3.33f;
 String str="가나다";
 System.out.printf("문자 ch=%c입니다\n",ch);
 System.out.printf("문자열 str=%s입니다\n",str);
 System.out.printf("실수 f=%f, %e입니다\n",f,f);
 System.out.printf("문자 ch=%c입니다\n문자열 str=%s입니다\n 실수 f=%f, %e입니다\n",ch,str,f,f);
//"10진수 100은 8진수로 xx이고, 16진수는 xx입니다.)  
 System.out.printf("10진수 %d은 8진수로 %o이고, 16진수로 %x \n",i,i,i);
 
 }
}

이 글은 스프링노트에서 작성되었습니다.

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 *
 *
 * @author
 */
public class strEnDeConvert {

    private  byte[] hexaMap = {0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68};

    protected  byte[] getHexaEncodingBytes(byte[] src)
 {
        byte[] buffer=new byte[src.length*2];
        int index=0;

  System.out.println("src.length="+ src.length);  

        for (int i=0; i < src.length; i++)
  {   buffer[index++] = hexaMap[ ( (src[i]&0xf0) >> 4 ) ];
            buffer[index++] = hexaMap[ ( src[i]&0x0f ) ];
        }
  return buffer;
    }

    protected  String getHexaEncoding(byte[] src,String charSet) throws UnsupportedEncodingException
 {
        byte[] strBytes=getHexaEncodingBytes(src);
        return new String(strBytes,charSet);
    }

    protected  String getHexaEncoding(byte[] src)
 {
        byte[] strBytes=getHexaEncodingBytes(src);
        return new String(strBytes);
    }

    /**
     * Digest 알고리즘을 수행한다.
     */
    public String getDigest(String str, String digest, String charset) {
        try
  {   MessageDigest md = MessageDigest.getInstance(digest);
            try
   {   byte[]      raw = str.getBytes(charset);
                byte[] digested = md.digest(raw);
                System.out.println("digested.length="+ digested.length); 
    System.out.println("str.length="+ str.length());

    return getHexaEncoding(digested, charset);
            } catch (UnsupportedEncodingException e) {
            } 
  } catch (NoSuchAlgorithmException e) {
        }       
        return str;
    }
 
 // Test
 public static void main(String[] args) throws Exception
 {
  strEnDeConvert ec = new strEnDeConvert();
  Defines        df = new Defines();
  System.out.println(ec.getDigest("1111122222333334445",df.PASSWORD_DIGEST, df.PASSWORD_CHARSET));
 }

}

이 글은 스프링노트에서 작성되었습니다.

[소스]

import java.io.File;
import java.lang.management.ClassLoadingMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryUsage;
import java.lang.management.RuntimeMXBean;
import java.lang.management.ThreadMXBean;

import com.sun.management.OperatingSystemMXBean;

/**
 * @co.kr.codein
 * @author yonghoon
 * 
 */
public class UseMxBean
{

  /**
 * @param args
 */
  public static void main(String[] args) {
    // TODO Auto-generated method stub
    new UseMxBean();
  }

  /*
 * 디스크용량
 */
  private void showDisk() {
    File root = null;

    try {
      root = new File("/");

      System.out.println("Total Space: " + toMB(root.getTotalSpace()));
      System.out.println("Usable Space: " + toMB(root.getUsableSpace()));
      
      /* added by cafe mocha */
      System.exit(0);

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

  }

  /*
 * cpu 사용량
 */
  private void showCPU() {
    OperatingSystemMXBean osbean = (OperatingSystemMXBean) ManagementFactory
      .getOperatingSystemMXBean();
    RuntimeMXBean runbean = (RuntimeMXBean) ManagementFactory
      .getRuntimeMXBean();

    long bfprocesstime = osbean.getProcessCpuTime();
    long bfuptime = runbean.getUptime();
    long ncpus = osbean.getAvailableProcessors();

    for (int i = 0; i < 1000000; ++i) {
      ncpus = osbean.getAvailableProcessors();
    }

    long afprocesstime = osbean.getProcessCpuTime();
    long afuptime = runbean.getUptime();

    float cal = (afprocesstime - bfprocesstime)
      / ((afuptime - bfuptime) * 10000f);

    float usage = Math.min(99f, cal);

    System.out.println("Calculation: " + cal);
    System.out.println("CPU Usage: " + usage);

  }

  private void showRuntime() {
    RuntimeMXBean runbean = (RuntimeMXBean) ManagementFactory
      .getRuntimeMXBean();

  }

  /*
 * 메모리 사용량
 */
  private void showMemory() {
    MemoryMXBean membean = (MemoryMXBean) ManagementFactory
      .getMemoryMXBean();

    MemoryUsage heap = membean.getHeapMemoryUsage();
    System.out.println("Heap Memory: " + heap.toString());

    MemoryUsage nonheap = membean.getNonHeapMemoryUsage();
    System.out.println("NonHeap Memory: " + nonheap.toString());

  }

  private void showClassLoading() {
    ClassLoadingMXBean classbean = (ClassLoadingMXBean) ManagementFactory
      .getClassLoadingMXBean();

    System.out.println("TotalLoadedClassCount: "
        + classbean.getTotalLoadedClassCount());
    System.out.println("LoadedClassCount: "
        + classbean.getLoadedClassCount());
    System.out.println("UnloadedClassCount: "
        + classbean.getUnloadedClassCount());

  }

  private void showThreadBean() {
    ThreadMXBean tbean = (ThreadMXBean) ManagementFactory.getThreadMXBean();

    long[] ids = tbean.getAllThreadIds();

    System.out.println("Thread Count: " + tbean.getThreadCount());

    for (long id : ids) {
      System.out.println("Thread CPU Time(" + id + ")"
          + tbean.getThreadCpuTime(id));
      System.out.println("Thread User Time(" + id + ")"
          + tbean.getThreadCpuTime(id));
    }

  }

  /**
 * OS 정보
 */
  private void showOSBean() {

    OperatingSystemMXBean osbean = (OperatingSystemMXBean) ManagementFactory
      .getOperatingSystemMXBean();

    System.out.println("OS Name: " + osbean.getName());
    System.out.println("OS Arch: " + osbean.getArch());
    System.out.println("Available Processors: "
        + osbean.getAvailableProcessors());
    System.out.println("TotalPhysicalMemorySize: "
        + toMB(osbean.getTotalPhysicalMemorySize()));
    System.out.println("FreePhysicalMemorySize: "
        + toMB(osbean.getFreePhysicalMemorySize()));
    System.out.println("TotalSwapSpaceSize: "
        + toMB(osbean.getTotalSwapSpaceSize()));
    System.out.println("FreeSwapSpaceSize: "
        + toMB(osbean.getFreeSwapSpaceSize()));
    System.out.println("CommittedVirtualMemorySize: "
        + toMB(osbean.getCommittedVirtualMemorySize()));
    System.out.println("SystemLoadAverage: "
        + osbean.getSystemLoadAverage());

  }

  public UseMxBean() {
    seperator(); showOSBean();
    seperator(); showThreadBean();
    seperator(); showClassLoading();
    seperator(); showMemory();
    seperator(); showDisk();
    seperator(); showCPU();
    seperator();
  }
  
  /* added cafe mocha 2009-06 */
  private void seperator() {
    System.out.println("-----------------------------------------------");
  }
  /* added cafe mocha 2009-06 */
  private String toMB(long size)
  {
    return (int)(size/(1024*1024))+"(MB)";
  }

} 

이 글은 스프링노트에서 작성되었습니다.

이 글은 스프링노트에서 작성되었습니다.

== 이클립스에 JDBC 에 연동 하여 sqlplus 처럼 사용 하는 것이다.

http://sourceforge.net/projects/eclipsesql/  에서 다운 받아 이클립스 폴더 에 덮어 쒸운다. 무거 우므로 따로 이클립스를 만든후 사용 하는게 좋다.

이클립스를 사용 중이라면 사용 종료후 재시작 을 한다./ 맨처음 로딩에 시간이 좀 걸린다...

preperenc-> SQL Exploler  -> auto commit  제거

오른쪽 위에 open perspective -> other ->Sql Exploler 선택

왼쪽에 Connection 에서 마우스 오른쪽 버튼 -> new Connect 클립 한다. Name 은 사용자의 이름 적고 (아무거나.)

나머지는 그림 따라서 알아서 하삼.

user 에는 사용자 계정 아이디를 반드시 적어야함.

이 글은 스프링노트에서 작성되었습니다.

준비물

1. JDK 설치와 환경변수 설정 (http://heartcrack.tistory.com/entry/JDK-다운로드와-환경변수-설정)

링크참조


2. 이클립스 다운로드(http://www.eclipse.org/downloads/)


3. JSmooth 를 다운로드 한뒤 컴퓨터에 설치

jsmooth-0.9.9-7-setup.exe

실행방법

1. 이클립스를 들어가서 해당하는 소스 파일을 연다.

2. FILE - EXPORT를 클릭한다. 그리고 Runnable jar file을 클릭 --> Next !

3.Launch Configuration에서 적절한 파일을 찾아 주고 추출 목적지에는 Jar파일이 저장될 곳을

지정해준다. 그다음 Finish를 눌러서 JAR파일을 생성해준다

4. JAR파일이 생성된것을 확인하고 이제 JSmooth를 실행해보자!

JSmooth의 첫페이지.

5. (불러오기를 하지 않은채로) 왼쪽탭에서 Skeleton을 클릭한다.

console wrapper는 콘솔 프로그램이고 windows wrapper는 윈도우 프로그램이다.

윈도우 프로그램을 선택했다면 첫번째 박스를 체크해준다. 나는 콘솔프로그램으로 진행

6. 그다음으로 이제 Executable탭에서

binary에는 저장될 파일명을 기록해 준다( exe확장자로 끝나도록)

그담에 icon에서는 ...을 눌러서 그림같은것들을 지정할수 있다.

이것이 exe파일의 아이콘이 되는데 바로가기 같은것을 해버리면,

컴파일이 실패 해버리므로. 적당한게 없으면 그냥 공백으로 두어도 좋다.

7. 그다음엔 Application 탭에 들어가서

   1번의 추가 버튼으로 2번의 JAR파일을 class path에 등록시킨 다음

   3번의 탭을 클릭해서 밑에 보이는 스샷처럼 메인 클래스(실행클래스 -public class)를 지정해준다.

    Embbeded jar 는 jar파일을 실행 파일에 포함시키는지에 대한 여부이다.

8. 그다음탭에 들어가서는 자바 VM ware의 버전을 적어 준다.

나는 1.7 버전을 기입.

9. 메모리에 대한 세팅을 한다 . 안해주어도 무방하다.

 11. 표시된 해골모양 또는, 프로젝트-컴파일을 클릭한다.

컴파일이 실패했다고 메시지가 떴다면 앞의 과정중에서 다른것이 잘못된것이다.

12. 바탕화면에 jsmooth로 확장자가 끝나는 파일과

exe파일이 생성되었다(나는 아이콘을 지정하지 않아서 기본모양으로 생성됨)

더블클릭해보면 잘 실행되는것을 알수있다.

이렇게 해서 JAVA파일 EXE 만들기 끗 ^ㅅ^

(참고: JDK가 설치된 컴퓨터에서만 EXE파일이 유효하니 알아두길)

이 글은 스프링노트에서 작성되었습니다.