sendtcp.java

用java写的tcp数据包发送和接收代码。

/**************************************************
 *copyright(c) 2007-2008 HBUT WUHAN
 *FILE_NAME:SendTCP.java
 *Author:杨慜	0412002225  Major:计算机科学与技术  
 *Version:1.0	Date:2008-01-09
 *Description:发送TCP数据包的发送端程序
 *Function List:
 **************************************************/

import java.net.*;
import java.io.*;


public class  SendTCP
{
	public static void main(String[] args) throws IOException 
	{
		if (args.length!=4)
		{
			System.out.println("您在命令行的输入格式有误，请按照以下格式重新输入！");
			System.out.println("源IP地址  源端口  目的IP地址 目的端口");
			System.exit(0);
		}
		String source_ip=args[0];
		int source_port=Integer.parseInt(args[1]);
		String dest_ip=args[2];
		int dest_port=Integer.parseInt(args[3]);
		if (dest_port!=10000)
		{
			System.out.println("请保持目的端口为10000!");
			System.exit(0);
		}
		OutputStream os=null; 
        PrintStream ps=null; 
		BufferedReader bf=null;
		String message="This is my homework of network!";
		Socket soc=null;
		try{
			soc=new Socket(dest_ip,dest_port);
		    System.out.println("***************************************************");
		    System.out.println("Connect to server......");
		    System.out.println("***************************************************");
			System.out.println();
            bf=new BufferedReader(
				new InputStreamReader(System.in));
            System.out.print("Please input the message: ");
            message=bf.readLine();
			os=soc.getOutputStream();
			ps=new PrintStream(os);
			ps.println(message);


			bf.close();
			ps.close();
			os.close();
			System.out.println();
			System.out.println("***************************************************");
			System.out.println("Send OK !");
			System.out.println("The message was send to the address: "+dest_ip+"["+dest_port+"]");
            System.out.println("***************************************************");
			soc.close();
		}catch(Exception e)
		{
			System.out.println(e);
		}
	}
}