[JAVA] Tcp客户端和服务器简单代码

服务器：

 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
 import java.net.ServerSocket;
 import java.net.Socket;

 public class TcpServer {
     public static void main(String [] args) throws IOException
     {
         @SuppressWarnings("resource")
         ServerSocket server=new ServerSocket(8000);
         Socket s=null;
         DataOutputStream dataOut=null;
         DataInputStream  dataIn=null;
         while(true){
             try{
                 s=server.accept();
                 dataOut=new DataOutputStream(s.getOutputStream());
                 dataIn =new DataInputStream(s.getInputStream());
                 while(true){
                     Byte c=dataIn.readByte();
                     if(c=='0'){
                         System.out.println("执行继电器快关变换！");
                         dataOut.writeByte('Y');
                     }else if(c=='w'){
                         System.out.println("将温度值传给服务器！");
                         dataOut.writeByte(2);
                     }else if(c=='s'){
                         System.out.println("将深度值传给服务器！");
                         dataOut.writeByte(4);
                     }else{
                         System.out.println("错误命令返回！");
                         dataOut.writeByte('N');
                     }
                 }
             }catch(IOException e){}
             dataOut.close();
             dataIn.close();
             s.close();
         }
     }
 }

客户端代码：

 /*
 TCP客户端:输入命令从服务器获得数据
 输入：0即开关继电器，当服务器执行好任务时返回89
     w获得温度数据，服务器返回温度数据
     s获得水深数据，服务器返回水深数据
     其他输入均为无效输入，服务器返回78
 PS：服务器只接受1个char,返回也是一个char,上述数据均为16进制
 */
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
 import java.net.InetAddress;
 import java.net.Socket;
 import java.util.Scanner;

 public class TcpClient {
     public static void main(String [] args) throws IOException
     {
         Socket s = null;
         DataInputStream DataIn = null;
         DataOutputStream DataOut = null;
         try {
             //s=new Socket(InetAddress.getByName("192.168.1.130"),8000);
             s=new Socket("localhost",8000);
             DataIn = new DataInputStream(s.getInputStream());
             DataOut=new DataOutputStream(s.getOutputStream());
             System.out.println("连接成功");
             @SuppressWarnings("resource")
             Scanner keyIn= new Scanner(System.in);
             while(keyIn.hasNext()){
                 String c=keyIn.nextLine();
                 System.out.println("输入: "+c);
                 if(c.length()==0)continue;
                 DataOut.writeByte(c.charAt(0));
                 System.out.println("收到: "+DataIn.readByte());
             }
             DataIn.close();
             DataOut.close();
             s.close();
         } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         DataIn.close();
         DataOut.close();
         s.close();
     }
 }