TCP

TCP

• 客户端

  1. 连接服务器Socket
  2. 发送消息

  //客户端
  public static void main(String[] args) {
      Socket socket = null;
      OutputStream outputStream = null;
      //了解服务器的地址
      try {
          InetAddress inetAddress = InetAddress.getByName("127.0.0.1");
          //端口号
          int port = 9999;
          //创建一个socket连接
          socket = new Socket(inetAddress, port);
          //发送消息：IO流
          outputStream = socket.getOutputStream();
          outputStream.write("测试成功！".getBytes());
  
      } catch (Exception e) {
          e.printStackTrace();
      } finally {
          if(socket!=null){
              try {
                  socket.close();
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
  
          if(outputStream!=null){
              try {
                  outputStream.close();
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
      }
  
  }
  

• 服务器

  1. 建立服务的端口ServerSocket
  2. 等待用户的连接accept
  3. 接收消息

  //服务端
  public static void main(String[] args) {
      ServerSocket serverSocket=null;
      Socket socket=null;
      InputStream inputStream=null;
      ByteArrayOutputStream baos=null;
  
      //需要有一个地址
      try {
          serverSocket = new ServerSocket(9999);
          //等待客户端连接
          socket = serverSocket.accept();
          //读取客户端消息
          inputStream = socket.getInputStream();
          //管道流
          baos = new ByteArrayOutputStream();
          byte[] buffer=new byte[1024];
          int len;
          while((len=inputStream.read(buffer))!=-1){
              baos.write(buffer,0,len);
          }
          System.out.println(baos.toString());
      } catch (IOException e) {
          e.printStackTrace();
      } finally {
          if(baos!=null){
              try {
                  baos.close();
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          if(inputStream!=null){
              try {
                  inputStream.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();
              }
          }
      }
  }