server.java

用Java写的最基本的网络与客户端通信的实例

// Server.java 
import java.io.*;
import java.net.*;
public class Server {
    public static void main(String[] args){ 
        try{   
            System.out.println("建立并等待连接......");   
            ServerSocket serverSocket = new ServerSocket(5500);      
            Socket connectToClient = serverSocket.accept();
            DataInputStream inFromClient = new DataInputStream(
                         connectToClient.getInputStream());
            DataOutputStream outToClient = new DataOutputStream(
                         connectToClient.getOutputStream());
            String  str;
            double  radius;
            while (true){
                str = inFromClient.readUTF();
                if(str.equals("bye")){
                    outToClient.writeUTF("bye");
                    break;
                }                    
                radius = Double.parseDouble(str);                        
                System.out.println("从客户端接收的半径: " + radius);
                double area = radius*radius*Math.PI;
                double volume=4*Math.PI*radius*radius*radius/3;
                String  s="半径为"+radius+"圆的面积"+area
				            +"\n半径为"+radius+"球的体积"+volume;
                outToClient.writeUTF(s);
                outToClient.flush();
                System.out.println("结果已求出并发送到客户: ");
            }
            inFromClient.close();
            outToClient.close();
            serverSocket.close();
		}
		catch(IOException e)  {
			e.printStackTrace();		
		}
    }
}