tcp连接

简单的tcp连接

客户端

1. 连接到服务器 Socket

2. 发送消息

   package TCP;
   
   import java.io.IOException;
   import java.io.OutputStream;
   import java.net.InetAddress;
   import java.net.Socket;
   
   //客户端
   public class TcpClientDemo01 {
       public static void main(String[] args) {
           Socket socket=null;
           OutputStream os=null;
           try {
               //1.要知道服务的地址 //端口号
               InetAddress ServerIp=  InetAddress.getByName("127.0.0.1");
               int port =9999;
               //创建一个socket连接
                socket =new Socket(ServerIp,port);
               //发送消息
                os = socket.getOutputStream();
               os.write("你好啊".getBytes());
           } catch (Exception e) {
               e.printStackTrace();
           }finally {
               if(os!=null){
                   try {
                       os.close();
                   } catch (IOException e) {
                       e.printStackTrace();
                   }
               }
              if(socket!=null){
                  try {
                      socket.close();
                  } catch (IOException e) {
                      e.printStackTrace();
                  }
              }
           }
       }
   }
   
   

服务器

1. 建立端口 ServerSocket

2. 等待连接 accept();

3. 接收消息

   package TCP;
   
   import java.io.ByteArrayOutputStream;
   import java.io.IOException;
   import java.io.InputStream;
   import java.net.ServerSocket;
   import java.net.Socket;
   
   //服务端
   public class TcpServerDemo01 {
       public static void main(String[] args) {
           ServerSocket serverSocket =null;
           Socket socket =null;
           InputStream is= null;
           ByteArrayOutputStream baos =null;
           try {
               //1.我得有一个地址
                serverSocket = new ServerSocket(9999);
               //2.等待客户端连接
                socket =serverSocket.accept();
               //读取客户端信息
                is = socket.getInputStream();
               /* 比较low 的写法
               *byte[] buffer = new  byte[1024];
              int len;
              while ((len=is.read(buffer))!=-1){
                  String msg =new String(buffer,0,len);
                  System.out.println(msg);
              }
               **/
               //管道流
               baos = new ByteArrayOutputStream();
               byte[] buffer = new  byte[1024];
               int len;
               while ((len=is.read(buffer))!=-1){
                 baos.write(buffer,0,len);
               }
               System.out.println(baos.toString());
   
           } catch (IOException e) {
               e.printStackTrace();
           }finally {
               //关闭资源
               if(baos!=null){
                   try {
                       baos.close();
                   } catch (IOException e) {
                       e.printStackTrace();
                   }
               }
               if (is!=null){
                   try {
                       is.close();
                   } catch (IOException e) {
                       e.printStackTrace();
                   }
               }
               if(socket!=null){
                   try {
                       socket.close();
                   } catch (IOException e) {
                       e.printStackTrace();
                   }
               }
               if(serverSocket!=null){
                   try {
                       serverSocket.close();
                   } catch (IOException e) {
                       e.printStackTrace();
                   }
               }
   
           }
   
       }
   }