JAVA TCP 编程小案例

import java.net.*;
import java.io.*;
import java.util.*;
public class TcpDemo
{
 //发送端
 
 public static void main(String[] args) throws Exception
 {
  Socket s = new Socket("127.0.0.1",9568);
  BufferedReader bufr =new BufferedReader(new InputStreamReader(System.in));
  BufferedWriter bufw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
  BufferedReader bufin = new BufferedReader(new InputStreamReader(s.getInputStream()));
  String line = null;
  while((line=bufr.readLine())!=null){
   if("over".equals(line))
    break;
   bufw.write(line+"\r\n");//写入结束字符
   bufw.flush();//刷新缓冲区
   String bigStr = bufin.readLine();
   System.out.println("big:"+bigStr);
  }
  
  bufr.close();
  s.close();
 }
}
class UpTCPDemo
{
 //服务端
 public static void main(String[] args) throws Exception
 {
 ServerSocket ss =ss= new ServerSocket(9568);
 Socket s= ss.accept();
 
 BufferedWriter bufw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
 BufferedReader bufin = new BufferedReader(new InputStreamReader(s.getInputStream()));
 
 String line =null;
 while((line=bufin.readLine())!=null){
  System.out.println("clinet:"+line);
  bufw.write(line.toUpperCase());
  bufw.newLine();//写入结束字符
  bufw.flush();//刷新缓冲区
 }
 s.close();
 ss.close();
 }

}