java 之网络通信

实现服务器与客户端之间的通信功能：

服务端：

import java.io.DataInputStream; import java.io.DataOutputStream; import java.net.Socket; public class bb { public static void main(String[] args) { try { for (int i=1;i<=100;i++) { Socket s= new Socket("localhost",5000); DataInputStream datain =new DataInputStream(s.getInputStream()); DataOutputStream dataout =new DataOutputStream(s.getOutputStream()); //BufferedReader in =new BufferedReader(new InputStreamReader(System.in)); //String x; //x=in.readLine(); //int a=Integer.parseInt(x); int a=(int) (Math.random()*1000); System.out.println("客户端"+a); dataout.writeInt(a); System.out.println("服务端"+datain.readInt()); datain.close(); dataout.close(); s.close(); } } catch (Exception e) { // TODO: handle exception System.out.println("yichang"+e); e.printStackTrace(); } } }

客户端：

import java.io.DataInputStream; import java.io.DataOutputStream; import java.net.ServerSocket; import java.net.Socket; public class aa { public static void main(String[] args) { try { ServerSocket server =null; server =new ServerSocket(5000); while (true) { Socket s = server.accept(); System.out.println("连接成功"); DataInputStream datain=new DataInputStream(s.getInputStream()); int a; a=datain.readInt(); DataOutputStream dataout =new DataOutputStream(s.getOutputStream()); dataout.writeInt(a*2); dataout.close(); datain.close(); s.close(); } } catch (Exception e) { // TODO: handle exception System.out.println("yichang"); e.printStackTrace(); } } }