socket模拟通信

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

public class client {

	public static void main(String[] args) throws UnknownHostException, IOException {
		Socket socket=new Socket("192.168.1.106",9991);
		InputStream in=socket.getInputStream();
		byte[]bytes=new byte[100];

		OutputStream o=new FileOutputStream("/root/桌面/12.txt");
		int len=3;
		while((in.read(bytes))!=-1) {
			o.write(bytes, 0, len);
		}

		o.close();
		in.close();
		socket.close();

	}

}

　　

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class socketserver {

	public static void main(String[] args) throws IOException {
		ServerSocket socket=new ServerSocket(9991);//默认本机ip
		Socket s=socket.accept();
		System.out.println("ok");
		OutputStream o=s.getOutputStream();
		String dd="hello";
		o.write(dd.getBytes());
		File f=new File("D:\\ip01.png");
		InputStream in=new FileInputStream(f);
		byte[]bytes=new byte[100];
		int len=9;
		while((len=in.read(bytes))!=-1) {
			o.write(bytes,0,len);

		}

//		System.out.println("sesrvershoudao:"+new String(bytes));

		o.close();

		in.close();
		socket.close();
		s.close();
	}

}