tcp 通信---cilent

package n07.wlyd;
import java.io.*;

import java.net.*;

public class Client {

 public static void main(String[] args) {

  try{

    //连接到本机，端口号5500

     Socket connectToServer=new Socket("localhost",5500);

     //将数据输入流连接到socket上

     DataInputStream inFromServer=new DataInputStream(

                                              connectToServer.

                                              getInputStream());

     //将数据输出流连接到socket上

     DataOutputStream outToServer=new DataOutputStream(

                                              connectToServer.

                                              getOutputStream());

     System.out.println("输入半径数值发送到服务器，输入bye结束。");

     String outStr,inStr;

     boolean goon=true;

     BufferedReader buf=new BufferedReader(new InputStreamReader

     (System.in));

     //反复读用户的数据并计算

     while(goon){

        outStr=buf.readLine();            //读入用户的输入

        outToServer.writeUTF(outStr);        //写到socket中

        outToServer.flush();                   //清空缓冲区，立即发送

        inStr=inFromServer.readUTF();        //从socket中读数据

        if(!inStr.equals("bye"))

           System.out.println("从服务器返回的结果是"+inStr);

        else

           goon=false;

     }

     inFromServer.close();

     outToServer.close();

     connectToServer.close();

  }catch(IOException e){

      e.printStackTrace();

  }

 }

}