使用TCP协议实现客户端和服务器数据传输

/*客户端和服务端互访,传输字节流*/

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

class TCPClient2 
{
	public static void main(String[] args) throws Exception
	{
		Socket s=new Socket ("192.168.191.1",10004);

		OutputStream out=s.getOutputStream();
		out.write("server nihao".getBytes());

		InputStream in=s.getInputStream();
		byte[] buf=new byte[1024];
		int len=in.read(buf);
		System.out.println(new String (buf,0,len));
		s.close();
	}
}

class TCPServer2 
{
	public static void main(String[] args) throws Exception
	{
		ServerSocket ss=new ServerSocket(10004);
		Socket s=ss.accept();

		String ip=s.getInetAddress().getHostAddress();
		System.out.println(ip+"...connected");
		InputStream in=s.getInputStream();
		byte[] buf=new byte[1024];
		int len=in.read(buf);
		System.out.println(new String (buf,0,len)); 

		OutputStream out=s.getOutputStream();
		Thread.sleep(10000);
		out.write("shoudao dajiahao".getBytes());

		s.close();

	}
}

/*
建立文本转换服务器:
客户端发送文本给服务器,服务器将文本转换成大写返回给服务端
客户端可以不断进行文本转换,输入over时结束
*/

/*
客户端:IO技术
源:键盘录入
目的:网络输出流
操作的是文本数据,可以选择字符流

步骤:
1,建立服务
2,获取键盘录入
3,将数据发给服务端
4,获取服务端返回的大写数据
5,结束,关资源


*/

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

class  TransClient
{
	public static void main(String[] args) throws Exception
	{
		Socket s=new Socket ("219.245.124.44",10005);

		//读取键盘数据,用转换流将System.in读取的键盘得到的字节流转换为字符流
		BufferedReader bufr=new BufferedReader(new InputStreamReader(System.in));
		//将数据写入到socket输出流,发给服务端
		BufferedWriter bufOut=new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));

		//socket读取流,读取服务端返回的数据
		BufferedReader bufIn=new BufferedReader(new InputStreamReader(s.getInputStream()));

		String line=null;
		while((line=bufr.readLine())!=null){
			if("over".equals(line))
				break;
			bufOut.write(line);
			bufOut.newLine();
			bufOut.flush();

			String str=bufIn.readLine();
			System.out.println("server:"+str);

		}
		
		bufr.close();
		s.close();
	}
}

/*
服务端:
源:socket读取流
目的:socket输出流
*/
class  TransServer
{
	public static void main(String[] args) throws Exception
	{
		ServerSocket ss=new ServerSocket(10005);
		Socket s=ss.accept();

		String ip=s.getInetAddress().getHostAddress();
		System.out.println(ip+"...connected");
		
		BufferedReader bufIn=
			new BufferedReader(new InputStreamReader(s.getInputStream()));

		BufferedWriter bufOut=
			new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));

		String line=null;
		while((line=bufIn.readLine())!=null){
			bufOut.write(line.toUpperCase());
			bufOut.newLine();
			bufOut.flush();
		}
		s.close();
		ss.close();
		
	}
}


 
  


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