tcp 通信---ServerThread

package n07.wlyd;

import java.io.*;

import java.net.*;

public class ServerThread extends Thread{

  private Socket connectToClient;

  private DataInputStream inFromClient;

  private DataOutputStream outToClient;

  //在构造方法中为每个套接字连接输入和输出流

  public ServerThread(Socket socket) throws IOException{

     super();

     connectToClient=socket;

     inFromClient=new DataInputStream(

                              connectToClient.getInputStream());

     outToClient=new DataOutputStream(

                              connectToClient.getOutputStream());

     start(); //启动run()方法

  }

  //在run()方法中与客户端通信

  public void run() {

     try{

         String str;

         double radius,area;

         boolean goon=true;

         while(goon){

            str=inFromClient.readUTF();

            if(!str.equals("bye")){

               radius=Double.parseDouble(str);

               System.out.println("接收到的半径值为："+radius);

               area=radius*radius*Math.PI;

               str=Double.toString(area);

               outToClient.writeUTF(str);

               outToClient.flush();

               System.out.println("圆面积"+str+"已经发送");

            }else{

               goon=false;

               outToClient.writeUTF("bye");

               outToClient.flush();

            }

         }

         inFromClient.close();

         outToClient.close();

         connectToClient.close();

      }catch(IOException e){

          e.printStackTrace();

      }

   }

}