TCP传输,客户端建立过程: 1、创建TCP客户端SOCKET服务,使用的Socket对象,并明确目的地要连接的主机; Socket socket = new Socket("192.168.1.4",10002); 2、如果连接建立成功,说明数据传输通道已建立。该通道就是Scoket流,是底层建立好的;可以用Socket对象来获取输出输入了流; OutputStream out = socket.getOutputStream(); 3、使用输出流将数据写出。 out.write("tcp演示".getBytes()); 4、关闭资源。 socket.close();

tcp服务端: 1、创建tcp服务端Socket服务,使用ServerSocket对象,指定一个端口供其他主机访问; ServerSocket ss = new ServerSocket(10002); 2、服务端为了不乱,会获取各个客户端Socket服务对象,用其自身的socket对象与其交流; Socket s = ss.accept(); String ip =s.getInetAddress().getHostAddress(); 3、通过客户端对象获取socket流读取客户端发来的数据 InputStream in = s.getInputStream(); byte[]buf = new byte[1024]; int len =in.read(buf); String text = new String(buf,o,len); 4、关闭资源。关客户端,关服务端;(关闭客户端是为了不占用服务端资源,而且在服务端关闭可控)

s.close(); //服务端一般不关闭;

import java.io.*;
import java.net.*;
public class Client{
      public static void main(String[]args)throws IOException{
              BufferedReader bufr = new BufferedReader(new FileReader("e:\\client.txt"));
            Socket ss = new Socket("192.168.1.4",9987);
            BufferedWriter bufout = new BufferedWriter(new OutputStreamWriter(ss.getOutputStream()));
            String line = null;
            while((line = bufr.readLine())!=null){
                 bufout.write(line);
                 bufout.newLine();
                 bufout.flush();
            }
            ss.shutdownOutput();
            BufferedReader bufin = new BufferedReader(new InputStreamReader(ss.getInputStream()));
            String text = bufin.readLine();
            System.out.println(text);
            bufr.close();
            bufout.close();
            bufin.close();
      }
}
import java.io.*;
import java.net.*;

public class Server{
      public static void main(String[]args)throws IOException{
            ServerSocket ss = new ServerSocket(9987);
            Socket s = ss.accept();
            BufferedReader bufin = new BufferedReader(new InputStreamReader(s.getInputStream()));
            PrintWriter pw = new PrintWriter(new FileWriter("f:\\server.txt"),true);
            String line =null;
            while((line=bufin.readLine())!=null){
                 pw.println(line);
            }
            BufferedWriter bufout = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
            bufout.write("上传成功");
            bufout.flush();
            s.close();
            pw.close();
      }
}