String Format for Int [C#]

Integer numbers can be formatted in .NET in many ways. You can use static method String.Format or instance method int.ToString. Following examples show how to align numbers (with spaces or zeroes), how to format negative numbers or how to do custom formatting like phone numbers.

Add zeroes before number

To add zeroes before a number, use colon separator „:“ and write as many zeroes as you want.

[C#]
String.Format("{0:00000}", 15); // "00015" String.Format("{0:00000}", -15); // "-00015"

Align number to the right or left

To align number to the right, use comma „,“ followed by a number of characters. This alignment option must be before the colon separator.

[C#]
String.Format("{0,5}", 15); // " 15" String.Format("{0,-5}", 15); // "15 " String.Format("{0,5:000}", 15); // " 015" String.Format("{0,-5:000}", 15); // "015 "

Different formatting for negative numbers and zero

You can have special format for negative numbers and zero. Use semicolon separator „;“ to separate formatting to two or three sections. The second section is format for negative numbers, the third section is for zero.

[C#]
String.Format("{0:#;minus #}", 15); // "15" String.Format("{0:#;minus #}", -15); // "minus 15" String.Format("{0:#;minus #;zero}", 0); // "zero"

Custom number formatting (e.g. phone number)

Numbers can be formatted also to any custom format, e.g. like phone numbers or serial numbers.

[C#]
String.Format("{0:+### ### ### ###}", 447900123456); // "+447 900 123 456" String.Format("{0:##-####-####}", 8958712551); // "89-5871-2551"

출처 : www.csharp-examples.net/string-format-int/

Java SocketServer control Image, DBConnect, String

package com.tistory.tansanc;

import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;

import javax.imageio.ImageIO;

class DBConnect {
	ResultSet rs = null;
	Connection conn = null;
	Statement stmt = null;
	public DBConnect() {
		try {
			String url = "jdbc:sqlserver://192.168.10.17:1433;DatabaseName=MSSQLSERVER";
			
			Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
			conn = DriverManager.getConnection(url, "sa", "1234");
			stmt = conn.createStatement();
			

		} catch (Exception e) {

		}
	}

	public void finalize() {
		try {
			rs.close();
			stmt.close();
			conn.close();
		} catch (Exception e) {

		}
	}
}

class PerClientThread extends Thread {
	Socket s;
	static ArrayList socketArray = new ArrayList();
	static DBConnect dbc;
	
	public PerClientThread()
	{
		
	}
	@Override
	public void run() {
		// TODO Auto-generated method stub

		socketArray.add(s);
		BufferedReader br;

		
		try {
			br = new BufferedReader(new InputStreamReader(s.getInputStream()));
			String temp;
			while ((temp = br.readLine()) != null) {
				// DB Query
				if (temp.startsWith("select")) {
					
					try {
						dbc.rs = dbc.stmt.executeQuery("SELECT * FROM [dbo].[TESTDB]");

						while (dbc.rs.next()) {
							String field1 = dbc.rs.getString("Date");
							String field2 = dbc.rs.getString("FileName");
							System.out.println(field1);
							System.out.println(field2);

							java.sql.Blob blb = dbc.rs.getBlob("Image");
							byte[] imagebytes = blb.getBytes(0, (int) blb.length());
							BufferedImage theImage = ImageIO.read(new ByteArrayInputStream(imagebytes));

						}
					} catch (Exception e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
					temp = "SQL:" + temp;
					System.out.println(temp);
				}
				// Arduino
				else if (temp.startsWith("insert"))
				{
					
				}
				// Arduino
				else if (temp.startsWith("image"))
				{

			        int size = Integer.parseInt(br.readLine());
			        
			        DataInputStream inputStream = new DataInputStream(s.getInputStream());
			        
			        byte[] imageAr = new byte[size];
			        inputStream.read(imageAr, 0, size);

			        BufferedImage image = ImageIO.read(new ByteArrayInputStream(imageAr));

			        System.out.println("Received " + image.getHeight() + "x" + image.getWidth() + ": " + System.currentTimeMillis());
			        ImageIO.write(image, "png", new File("C:\\test2.png"));


				}
				// Arduino
				else if (temp.startsWith("to"))
				{
					
				}
				System.out.print(s.getInetAddress() + " : ");
				System.out.println(temp);
				for (int i = 0; i < socketArray.size(); i++) {
					PrintWriter os = new PrintWriter(socketArray.get(i).getOutputStream(), true);
					os.print(s.getInetAddress() + " : ");
					os.println(temp);
				}
			}

		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		super.run();
	}
}

public class Server {
	public static void main(String[] args) throws Exception {
 
		System.out.println("Server Side");
		ServerSocket ss = new ServerSocket(33333);
		Socket s;
		while (true) {
			s = ss.accept();
			PerClientThread pct = new PerClientThread();
			pct.s = s;
			pct.dbc = new DBConnect();
			pct.start();
		}

	}
}

package com.tistory.tansanc;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JTextField;

class MyFrame extends JFrame {
	public static JTextArea textArea;
	JTextField textField;
	PrintWriter out;
	Socket s;

	public MyFrame() {
		textArea = new JTextArea();
		textField = new JTextField();
		add(BorderLayout.CENTER, textArea);
		add(BorderLayout.SOUTH, textField);
		textField.addActionListener(new FieldListener());
		setSize(300, 200);
		setTitle("채팅프로그램 Client");
		setVisible(true);
		// GUI를 설계한다.
	}

	class FieldListener implements ActionListener {

		@Override
		public void actionPerformed(ActionEvent e) {
			// TODO Auto-generated method stub
			if (textField.getText().compareTo("image") == 0) {

				BufferedImage image;
				ByteArrayOutputStream byteArrayOutputStream = null;
				DataOutputStream os = null;
				try {
					image = ImageIO.read(new File("C:\\test.png"));
					byteArrayOutputStream = new ByteArrayOutputStream();
					ImageIO.write(image, "png", byteArrayOutputStream);
					os = new DataOutputStream(s.getOutputStream());
				} catch (Exception e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
				
				try {
					int size = byteArrayOutputStream.size();
					out.println("image");
					out.println(size);
					os.write(byteArrayOutputStream.toByteArray());
					os.flush();
				} catch (Exception e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}

			} else {
				out.println(textField.getText());
				textField.setText("");
			}
			// 메세지 보내기
		}
	}
}

class SendThread extends Thread {
	PrintWriter out;

	public SendThread(PrintWriter out) {
		this.out = out;
	}

	@Override
	public void run() {
		// TODO Auto-generated method stub
		super.run();
	}
}

class RecvThread extends Thread {
	BufferedReader in;

	public RecvThread(BufferedReader in) {
		this.in = in;
	}

	@Override
	public void run() {
		String temp;
		try {
			while ((temp = in.readLine()) != null) {

				MyFrame.textArea.setText(MyFrame.textArea.getText() + "\n" + temp);
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

class ClientModule {
	MyFrame mFrame;
	SendThread mSendThread;
	RecvThread mRecvThread;
	Socket s;

	// 서버에 패킷을 보내는 Thread
	// 서버로부터 패킷을 받는 Thread
	public ClientModule() // 준비
	{

		try {
			s = new Socket("192.168.10.17", 33333);
			PrintWriter out = new PrintWriter(s.getOutputStream(), true);
			BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));
			mFrame = new MyFrame(); // GUI 객체
			mFrame.s = s;
			mFrame.out = out;
			mSendThread = new SendThread(out);
			mRecvThread = new RecvThread(in);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	void start() // 시작
	{
		mSendThread.start();
		mRecvThread.start();
	}
}

public class Client {
	public static void main(String[] args) {
		ClientModule cm = new ClientModule();
		// 초기화 작업
		cm.start();
		// Thread.start();
	}
}