Socket s=new Socket("127.0.0.1", 10001);//创建一个流套接字并将其连接到指定主机上的指定端口号

ServerSocket ss=new ServerSocket(10001);//创建绑定到特定端口的服务器套接字

public class ClientDemo
{
 public static void main(String[] args) throws UnknownHostException, IOException
   {
  Socket s=new Socket("127.0.0.1", 10004);
  BufferedReader buf = new BufferedReader(new FileReader("C:\\Users\\Administrator\\Desktop\\1.txt"));
  String line=null;
  /*PrintWriter out=new PrintWriter(s.getOutputStream(),true);
    while((line=buf.readLine())!=null)
    {
      out.println(line);
    }
    */
  BufferedWriter out=new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
  while((line=buf.readLine())!=null)
      {
   out.write(line);
   out.newLine();
   out.flush();
  }
  s.shutdownOutput();
  BufferedReader in=new BufferedReader(new InputStreamReader(s.getInputStream()));
  String str=in.readLine();
  System.out.println(str);
  s.close();
  buf.close();
 }
}

public class ServerDemo
{
 public static void main(String[] args) throws IOException
   {
  ServerSocket ss=new ServerSocket(10004);
  Socket s=ss.accept();
  BufferedReader in=new BufferedReader(new InputStreamReader(s.getInputStream()));
  String line=null;
  /*PrintWriter buf=new PrintWriter(new FileWriter("C:\\Users\\Administrator\\Desktop\\2.txt"),true);
    while((line=in.readLine())!=null)
    {  
      buf.println(line);
    }*/
  BufferedWriter buf=new BufferedWriter(new FileWriter("C:\\Users\\Administrator\\Desktop\\2.txt"));
  while((line=in.readLine())!=null)
      {
   buf.write(line);
   buf.newLine();
   buf.flush();
  }
  PrintWriter out=new PrintWriter(s.getOutputStream(),true);
  out.println("传输成功！");
  ss.close();
  buf.close();
 }
}

public class SocketServer
{
  public static void main(String[] args) throws IOException 
  {
    ServerSocket server=new ServerSocket(11000);
    Socket client=server.accept();
    PrintWriter out=new PrintWriter(client.getOutputStream(),true);
    out.println("你好！");
    server.close();
  }
}

public class SocketServer
{
  public static void main(String[] args) throws IOException 
  {
    ServerSocket server=new ServerSocket(11000);
    Socket client=server.accept();
    PrintWriter out=new PrintWriter(client.getOutputStream(),true);
    BufferedReader in=new BufferedReader(new InputStreamReader(client.getInputStream()));
    String line=null;
    while((line=in.readLine())!=null)
      System.out.println(line);
    out.println("你好！");
    server.close();
  }
}

public class ClientDemo
{
 public static void main(String[] args) throws UnknownHostException, IOException
   {
  Socket s=new Socket("192.168.1.120",8080);
  PrintWriter out=new PrintWriter(s.getOutputStream(),true);
  //将请求头发给服务器
  out.println("GET /myweb/demo.html HTTP/1.1");
  out.println("Accept:*/*");
  out.println("Host: 192.168.1.120:11000");
  out.println("Connection: Keep-Alive");
  //输出空行，此步骤不可少
  out.println();
  BufferedReader in=new BufferedReader(new InputStreamReader(s.getInputStream()));
  String line=null;
  //返回服务器的响应文件
  while((line=in.readLine())!=null)
      {
   System.out.println(line);
  }
  s.close();
 }
}