Java项目开发与毕业设计指导 朱福喜, 黄昊编著 清华大学出版社 项目1

				package client;
				
				import java.net.*;
				import java.net.*;
				import java.io.*;
				import fishinfo.FishInfo;
				
				public class Sender{
				
				       //private DatagramSocket socket;
				       //private DatagramPacket packet;
				       InetAddress ser_inet;
				       FishInfo info;
				
				       public Sender(FishInfo  info,InetAddress ser_inet){
				          this.ser_inet = ser_inet;
				          this.info = info;
				          send();
				       }
				       private synchronized void  send()
				       {
				       try {
				            DatagramSocket socket;
				            DatagramPacket packet;
				          ByteArrayOutputStream byteStream = new ByteArrayOutputStream(500);
				            ObjectOutputStream os = new ObjectOutputStream(new
				                                    BufferedOutputStream(byteStream));
				            os.flush();
				            os.writeObject(info);
				            os.flush();
				            byte[] sendBuf = byteStream.toByteArray();
				
				           //创建udp数据包以发送数据
				           System.out.println("send data to:"+ser_inet.getHostAddress());
				           packet = new  DatagramPacket(sendBuf,sendBuf.length,
				                                        ser_inet,5003);
				           //创建发送udp套接字，指定套接字口。
				           //绑定端口5002，发送通信数据
				           //如果该端口已绑定，则等待片刻后，重新绑定
				           while(true)
				           {
				           try{
				           socket = new DatagramSocket(5002);
				           break;
				           }
				           catch(BindException be)
				           {
				             Thread.sleep(20);
				             continue;
				           }
				           }
				           os.close();
				           //绑定成功后，发送通通信数据
				           socket.send(packet);
				           //发送完毕关闭套接字。
				           socket.close();
				           }catch(Throwable t) {
				            t.printStackTrace();
				        }
				       }
				}