socket实现一对一通讯

本程序中，客户端输入一个数据饼传送到服务器，服务器处理该数据返回结果，实现一对一通讯
客户端：client.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package client;
import java.io.*;
import java.net.*;

/**
 *
 * @author Administrator
 */
public class Client {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        try{
            Socket connetcToServer=new Socket("localhost",5500);//连接本机端口
            //将数据输入流连接到socket上
            DataInputStream inFromServer=new DataInputStream(connetcToServer.getInputStream());
            //将数据输出流连接到socket上
            DataOutputStream outToServer=new DataOutputStream(connetcToServer.getOutputStream());
            System.out.println("输入半径值 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));
            while(goon){
                outStr=buf.readLine();//读取用户的输入
                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();
            connetcToServer.close();
        }catch(IOException e)
        {
            e.printStackTrace();
        }
    }

}

服务器端：Server.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package server;
import java.io.*;
import java.net.*;

/**
 *
 * @author Administrator
 */
public class Server {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        try{
            System.out.println("等待连接...");
            //创建服务端套接字，端口号5500要与客户端相同
            ServerSocket ServerSocket=new ServerSocket(5500);
            Socket connectToClient=ServerSocket.accept();
            System.out.println("连接来自于"+connectToClient.getInetAddress().getHostAddress());
                DataInputStream inFromClient=new DataInputStream(connectToClient.getInputStream());
            DataOutputStream outToClient=new DataOutputStream(connectToClient.getOutputStream());
            String str;
            double radius,area;
            boolean goon=true;
            while(goon)
            {
                str=inFromClient.readUTF();
                if(!str.equals("bye")){
                    radius=Double.parseDouble(str);
                    System.out.println("接收到的半径是"+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();
            ServerSocket.close();

        }catch(IOException e)
        {
            e.printStackTrace();
        }
    }

}

实现效果：