java UDP传输

TCP通过 ServerSocket 和 Socket 来实现传输

UDP主要通过 DatagramSocket 和 DatagramPacket 来完成传输

直接上代码

服务器端：

# public class UdpServer  
# {  
#     private DatagramSocket server;  
#   
#     private DatagramPacket packet;  
#   
#     private byte[] b;  
#   
#     private String str;  
#   
#     public UdpServer()  
#     {  
#         Init();  
#     }  
#   
#     private void Init()  
#     {  
#           
#         b = new byte[1024];  
#           
#         receive();  
#     }  
#   
#     private void receive()  
#     {  
#         try  
#         {  
#             server=new DatagramSocket(11111); //绑定11111端口  
#   
#             while(true)  
#             {  
#                 packet = new DatagramPacket(b, b.length);  
#   
#                 server.receive(packet); //接收数据包  
#   
#                 int i = packet.getLength();  
#   
#                 if(i>0) //数据包有内容，就打印出接收到的数据  
#                 {  
#                     str = new String(b, 0, i);  
#                     System.out.println("接收到的字符 == " + str);   
#                     packet = null;   
#                 }  
#             }     
#         }catch(SocketException e)  
#         {  
#             e.printStackTrace();  
#         }catch(IOException e)  
#         {  
#             e.printStackTrace();  
#         }finally  
#         {  
#             server.close();  
#         }  
#     }  
#   
#     public static void main(String[] args)  
#     {  
#         new UdpServer();  
#     }  
# }

客户端：

# public class UdpClient  
# {  
#     private DatagramSocket client;  
#   
#     private DatagramPacket packet;  
#   
#     private byte b[];  
#   
#     public UdpClient()  
#     {  
#         Init();  
#     }  
#   
#     private void Init()  
#     {  
#         b = new byte[1024];  
#           
#         send();  
#     }  
#   
#     private void send()  
#     {  
#         try  
#         {  
#             client = new DatagramSocket();  
#               
#             b = "UDP数据发送".getBytes(); //发送给服务器端的数据  
#               
#             packet = new DatagramPacket(b, b.length, new InetSocketAddress("127.0.0.1", 11111)); //绑定服务器  
#             client.send(packet); //发送数据包  
#         } catch (SocketException e)  
#         {  
#             e.printStackTrace();  
#         } catch (IOException e)  
#         {  
#             e.printStackTrace();  
#         } finally  
#         {  
#             client.close();  
#         }  
#     }  
#   
#     public static void main(String[] args)  
#     {  
#         new UdpClient();  
#     }  
# }