在对java的udp扫描方法研究时的发现

package com.raikou.webScan;import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;public class UdpPort {public UdpPort() {super();// TODO Auto-generated constructor stub
}public void TestUdpPort(){String ipAddress &＃61; "10.243.132.12";int port &＃61; 4 ;DatagramSocket connection &＃61; null;byte[] myByte &＃61; ipAddress.getBytes();String myStr &＃61; new String(myByte);try{//connection &＃61; new DatagramSocket(port, InetAddress.getByName(ipAddress));//(ipAddress, port);connection &＃61; new DatagramSocket();//(ipAddress, port);//connection.setReceiveTimeout(20*1000);connection.setSoTimeout(120*1000);connection.connect( InetAddress.getByName(ipAddress), port);System.out.println("连结创建完成...");connection.send((new DatagramPacket(myByte, myByte.length)));System.out.println(" 数据发送完成...");while(true){byte[] newByte &＃61; new byte[4096];DatagramPacket dp &＃61; new DatagramPacket(newByte, 4096);connection.setSoTimeout(9000);connection.receive(dp);System.out.println("11");if (dp !&＃61; null && dp.getData() !&＃61; null){System.out.println(dp.getLength());System.out.println("#####");byte[] rslt &＃61; dp.getData();for (int i &＃61; 0;i ){System.out.println(rslt[i]);//System.out.println();
}System.out.println("#####");}//String myDump &＃61; buffer.getHexDump();break;}connection.close();}catch(Exception ex1){ex1.printStackTrace();}}/*** &＃64;param args*/public static void main(String[] args) {// TODO Auto-generated method stubUdpPort up &＃61; new UdpPort();up.TestUdpPort();}}

package com.raikou.test;import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;/*** UDP/IP阻塞模式* */public class UDPBIO {/*** 服务器端和客户端类似 * &＃64;param ipStr IP地址* &＃64;param portNum 端口号* */ public void udpListen(String ipStr, int portNum){try {//若希望是全双工模式&＃xff0c;则启动一个监听端口&＃xff0c;承担服务器的职责//若不能绑定到指定端口&＃xff0c;则抛出SocketExceptionDatagramSocket serverSocket &＃61; new DatagramSocket(portNum);InetAddress server &＃61; InetAddress.getByName(ipStr);byte[] buffer &＃61; new byte[65507];DatagramPacket receivePacket &＃61; new DatagramPacket(buffer,buffer.length);DatagramSocket socket &＃61; new DatagramSocket();DatagramPacket packet &＃61; new DatagramPacket(buffer,buffer.length,server,portNum);//阻塞发送packet到指定的服务器和端口//网络IO异常&＃xff0c;抛出IOExceprion//连不上IP和端口&＃xff0c;抛出PortUnreachableException
socket.send(packet);serverSocket.setSoTimeout(9000);//阻塞并同步读取流信息&＃xff0c;如接收到的信息流比packet长&＃xff0c;则删除更长的信息
serverSocket.receive(receivePacket);/* byte[] rslt &＃61; receivePacket.getData();for (int i &＃61; 0;i */} catch (SocketException e) {// 若不能绑定到指定端口
e.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch block
e.printStackTrace();}catch(Exception ex1){ex1.printStackTrace();}}public static void main(String[] args) {// TODO Auto-generated method stubUDPBIO p &＃61; new UDPBIO();p.udpListen("10.243.132.73", 137);}}