private String GetUserByFingerprint(String fp) { String sError = null; try { DatagramSocket sockUdp = new DatagramSocket(); sockUdp.setSoTimeout(8000); InetAddress adrs_Idsvr = InetAddress.getByName("127.0.0.1");// seidsvr.jar UDP 17020 byte[] wbuf = String.format("SysID=wssvr;Finger=%s;", fp).getBytes(); // fp: 0301... DatagramPacket wPkt = new DatagramPacket(wbuf, wbuf.length, adrs_Idsvr, 17020); sockUdp.send(wPkt); Thread.sleep(1000); byte[] rbuf = new byte[256]; DatagramPacket rPacket = new DatagramPacket(rbuf, rbuf.length); sockUdp.receive(rPacket);// Blocking... sockUdp.close(); String sBuf = new String(rbuf); // DevMsg=90,{UserName}; int iEqual = sBuf.indexOf('='); int iComma = sBuf.indexOf(','); int iCol = sBuf.indexOf(';'); if (iEqual>0 && iComma>0 && iCol>0) { if (iComma+1 == iCol) // not match return null; else return String.format("{\"UserName\":\"%s\", \"MatchScore\":%s}", sBuf.substring(iComma+1, iCol), sBuf.substring(iEqual+1, iComma)); } else { sError = sBuf; } } catch (Exception e) { sError = "GetUserByFingerprint: "+e.getMessage(); log.error(sError); } return String.format("{\"ErrorMessage\":\"%s\"}", sError); }

import java.io. ; import java.net.; import java.util. *; public class EchoServer{ public static void main(String[] args) throws IOException {new EchoServerThread().start();}} class EchoServerThread extends Thread{ protected DatagramSocket socket = null; protected BufferedReader in = null; protected boolean hasMoreWork = true; protected int number = 0;//访问计数变量 public EchoServerThread() throws IOException{ this("EchoServerThread"); } public EchoServerThread(String name) throws IOException{ super(name); socket = new DatagramSocket(4248); public void run(){ while (hasMoreWork) { try{ byte[] buf = new byte[256];//接收应答 DatagramPacket packet = new DatagramPacket(buf, buf.length); socket.receive(packet); //创建应答 String dString = null; number++; dString ="Hi!你是第"+ number + "个访问者!"; buf = dString.getBytes();//将应答发送给端口和地址为"address""port"的客户 InetAddress address = packet.getAddress(); int port = packet.getPort(); packet = new DatagramPacket(buf, buf.length, address, port); socket.send(packet); }catch (IOException e){ e.printStackTrace(); hasMoreWork = false; } } socket.close();} } }哪里出错了

protected DatagramSocket socket = null; protected BufferedReader in = null; protected boolean hasMoreWork = true; protected int number = 0; // 访问计数变量 public EchoServerThread() throws ...

优化下面代码package Zzz; import java.awt.TexturePaint; import java.io.File; import java.io.FilenameFilter; import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; import java.text.BreakIterator; import java.util.Scanner; import javax.imageio.metadata.IIOInvalidTreeException; import javax.imageio.plugins.jpeg.JPEGImageWriteParam; import javax.sound.sampled.Port; import org.omg.CORBA.INTERNAL; public class Test3{ public static void main(String[] args) throws IOException { // TODO Auto-generated method stub Scanner scanner=new Scanner(System.in); System.out.print("请输入对方的IP地址"); String ipAddress=scanner.nextLine(); InetAddress ip=InetAddress.getByName(ipAddress); System.out.print("请输入对方的端口号"); int toPort=scanner.nextInt(); System.out.print("请输入本地接受的端口号:"); int listenPort=scanner.nextInt(); new Thread(); new Thread(); } } class SendThread implements Runnable{ private int Port; private InetAddress ip; public SendThread(int Port,InetAddress ip) { this.ip=ip; this.Port=Port; // TODO Auto-generated constructor stub } @Override public void run() { // TODO Auto-generated method stub try { Scanner scanner=new Scanner(System.in); DatagramSocket socket=new DatagramSocket(); System.out.println("开始聊天"); DatagramPacket packet=new DatagramPacket(new byte[1024], 1024, ip, Port); while(true){ String zyk=scanner.nextLine(); packet.setData(zyk.getBytes()); socket.send(packet); if (zyk.equals("bye")) { break; } } System.out.println("退出聊天"); socket.close(); } catch (Exception e) { // TODO: handle exception } } } class RecieveThread implements Runnable{ private int Port; public RecieveThread(int Port){ this.Port=Port; } @Override public void run() { while(true){ try { DatagramSocket socket=n

String message = new String(packet.getData(), 0, packet.getLength()); System.out.println("对方说: " + message); if (message.equals("bye")) { break; } } } catch (Exception e) { e....

将这个代码修改正确并输出结果import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; public class UDPReceive { public static void main(String[ args) throws IOException { DatagramSocket receiveSocket = new DatagramSocket(12306); byte[] buffer = new byte[1024]; DatagramPacket dp = new DatagramPacket(buffer, 1024); receiveSocket.receive(dp); InetAddress ipAddress = dp.getAddress0; String ip = ipAddress.getHostAddress0; byte[] data = dp.getData0; int length = dp.getl ength0; String dataStr = new String(data,0,length); System.out.println("IP地址: "+ip+ ",数据是"+ dataStr); receiveSocket.close(; } public class UDPSend { public static void main(String[ args) throws IOException { DatagramSocket sendSocket = new DatagramSocket); byte[] buffer = "hello,UDP".getBytes0; DatagramPacket dp = new DatagramPacket(buffer, buffer.length, InetAddress .getByName("192.168.56.1"), 12306); //本机地址为 : 192.168.56.1 sendSocket.send(dp); sendSocket.close);

String dataStr = new String(data, 0, length); System.out.println("IP地址: " + ip + ", 数据是 " + dataStr); receiveSocket.close(); } } UDPSend.java： java import java.io.IOException; ...

// 创建文件 SimpleDateFormat df = new SimpleDateFormat("yyyy_MM_dd_HH_MM_SS"); String dfName = df.format(new Date()); filename = dfName+".csv"; logFilename = dfName+".log"; Util.saveFile(XbyActivity.this, filename, "", false); Util.saveFile(XbyActivity.this, logFilename, "", false); // udp if(udpFlag){ if(sendSocket==null || !sendSocket.isBound()){ try { sendSocket = new DatagramSocket(0); } catch (SocketException e) { e.printStackTrace(); } } } }解释每一句代码

String dfName = df.format(new Date()); filename = dfName+".csv"; logFilename = dfName+".log"; 这几行代码创建了一个 SimpleDateFormat 对象，并使用当前日期时间生成了一个格式化的字符串。接着，将该...

DatagramSocket socket = new DatagramSocket(); int hostPort =socket.getLocalPort();//获取当前收发地址的端口 String hostIP = InetAddress.getLocalHost().getHostAddress();

这段代码创建了一个 DatagramSocket 对象，并通过该对象获取了当前收发地址的端口号和本机的 IP 地址。具体来说，第一行代码创建了一个 DatagramSocket 对象，该对象可以用于发送和接收 UDP 数据报。在创建 ...

将下列数据包通讯程序代码完善，使得可以实现两个客户端之间互相传递信息package ChattingApp; import javax.swing.; import java.awt.; import java.awt.event.*; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; @SuppressWarnings("serial") public class ChattingApp extends JFrame implements ActionListener { private JTextArea chatHistory; private JTextField chatInput; private JButton sendBtn, clearBtn, exitBtn; // 发送，清空，退出按钮 private DatagramSocket socket; private InetAddress address; private int port; public ChattingApp() { setTitle("Chat Application"); setSize(500, 500); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); chatHistory = new JTextArea(20, 40); chatHistory.setEditable(false); JScrollPane scrollPane = new JScrollPane(chatHistory); chatInput = new JTextField(30); sendBtn = new JButton("发送"); sendBtn.addActionListener(this); clearBtn = new JButton("清空"); clearBtn.addActionListener(this); exitBtn = new JButton("退出"); exitBtn.addActionListener(this); JPanel panel = new JPanel(); panel.add(chatInput); panel.add(sendBtn); panel.add(clearBtn); panel.add(exitBtn); add(scrollPane, BorderLayout.CENTER); add(panel, BorderLayout.SOUTH); setVisible(true); try { socket = new DatagramSocket(); address = InetAddress.getByName("localhost"); port = 9999; } catch (Exception e) { e.printStackTrace(); } new Thread(new ReceiveThread()).start(); } public void actionPerformed(ActionEvent e) { if (e.getSource() == sendBtn) { String message = chatInput.getText(); if (!message.isEmpty()) { byte[] data = message.getBytes(); DatagramPacket packet = new DatagramPacket(data, data.length, address, port); try { socket.send(packet); } catch (Exception ex) { ex.printStackTrace(); } chatInput.setText(""); } } if (e.getSource() == clearBtn) { chatInput.setText(""); } if (e.getSource() == exitBtn) { System.exit(0); } } private class ReceiveThread implements Runnable { public void run() { try { byte[] buffer = new byte[1024]; DatagramPacket packet = new DatagramPacket(buffer, buffer.length); while (true) { socket.receive(packet); String message = new String(packet.getData(), 0, packet.getLength()); chatHistory.append(message + "\n"); } } catch (Exception e) { e.printStackTrace(); } } } }

String message = new String(packet.getData(), 0, packet.getLength()); chatHistory.append(message + "\n"); } } catch (Exception e) { e.printStackTrace(); } } } public static void main(String...

private RecyclerView recyclerView; DeviceAdapter adapter; // socket DatagramSocket sendSocket = null; InetAddress serverAddress = null; public XbyActivity() { super(); }

这段代码看起来像是一个 Android Activity ...同时还声明了一个 DatagramSocket 对象 sendSocket 和一个 InetAddress 对象 serverAddress 用于进行 socket 通信。这个 Activity 类的具体功能需要看更多的代码才能确定。

import java.net.*;public class UDPClient { public static void main(String[] args) throws Exception { DatagramSocket clientSocket = new DatagramSocket(); InetAddress IPAddress = InetAddress.getByName("localhost"); byte[] sendData = new byte[1024]; byte[] receiveData = new byte[1024]; while (true) { String sentence = "hello server"; sendData = sentence.getBytes(); DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, 9876); clientSocket.send(sendPacket); DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length); clientSocket.receive(receivePacket); String modifiedSentence = new String(receivePacket.getData()); System.out.println("Server: " + modifiedSentence); } }}

DatagramSocket serverSocket = new DatagramSocket(9876); byte[] receiveData = new byte[1024]; byte[] sendData = new byte[1024]; while (true) { DatagramPacket receivePacket = new DatagramPacket...

将下列代码改为python：try { DatagramSocket dsocket = new DatagramSocket(finalPort); dsocket.close(); } catch (SocketException e) { portList.add(finalPort); System.out.println("UDP端口" + finalPort + "开放"); } latch.countDown();

try: dsocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) dsocket.bind(('', finalPort)) dsocket.close() except socket.error: portList.append(finalPort) print(f"UDP端口{finalPort}开放") ...

将下列代码改为python代码：import java.util.ArrayList; import java.util.Comparator; import java.util.List; import java.util.concurrent.CountDownLatch; import java.net.; public class Scanport { public static void main(String[] args) throws InterruptedException { String host = "120.46.209.149"; int startPort = 1; int endPort = 1024; int start = 0; int end = 0; int step = Math.round(endPort / 1000) + 1;// 四舍五入函数 for (int i = 1; i < step; i++) { start = startPort + (i - 1) 1000; end = startPort + i * 1000; System.out.println("正在扫描" + start + "-" + end); scan(host, start, end); } } public static void scan(String host, int startPort, int endPort) throws InterruptedException { List<Integer> portList = new ArrayList<>(); final CountDownLatch latch = new CountDownLatch(endPort - startPort + 1); for (int port = startPort; port <= endPort; port++) { int finalPort = port; Thread thread = new Thread(new Runnable() { @Override public void run() { try { Socket socket = new Socket(); socket.connect(new InetSocketAddress(host, finalPort), 100); System.out.println("TCP端口" + finalPort + "开放"); portList.add(finalPort); } catch (Exception e) { } try { DatagramSocket dsocket = new DatagramSocket(finalPort); dsocket.close(); } catch (SocketException e) { portList.add(finalPort); System.out.println("UDP端口" + finalPort + "开放"); } latch.countDown(); } }); thread.start(); } latch.await(); portList.sort(new Comparator<Integer>() { @Override public int compare(Integer o1, Integer o2) { return o1.compareTo(o2); } }); } }

try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(0.1) sock.connect((host, port)) print("TCP端口{}开放".format(port)) portList.append(port) sock.close() except: ...

2. 使用基于UDP的Java Socket编程，完成在线咨询功能：（1）客户向咨询人员咨询。（2）咨询人员给出回答。（3）客户和咨询人员可以一直沟通，直到客户发送bye给咨询人员。 AskServer.java public class AskServer { public static void main(String[] args) { // 创建DatagramSocket，发送接收数据都依赖他（1） ; try { socket = new DatagramSocket(8888); （2） ;//输入 while (true) { // 准备一个空的数据包，用来接收数据 byte[] buf = new byte[1024]; DatagramPacket packet = new DatagramPacket(buf, buf.length); // 接收数据使用空的数据包（3） ; // 输出信息 String info = new String(packet.getData(), 0, packet.getLength()); System.out.println("客户端请求：" + info); // 判断是否退出 if ("bye".equals(info)) { break; } // 发送数据 String result = input.nextLine(); （4） ; DatagramPacket packet2 = new DatagramPacket(buf2, buf2.length, packet.getAddress(), packet.getPort()); socket.send(packet2); } } catch (SocketException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { （5）System.out.println("客户端已退出"); socket.close() ; } } }

DatagramSocket socket = null; try { socket = new DatagramSocket(); Scanner input = new Scanner(System.in); while (true) { // 获取要发送的信息 String request = input.nextLine(); byte[] buf = ...

datagramSocket.receive

datagramSocket.receive() 是 Java 中用于从 DatagramSocket 接收数据报文的方法。当调用该方法时，程序会阻塞等待直到收到数据报文，或者发生超时。该方法的语法如下： java public void receive...

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private RecyclerView recyclerView; DeviceAdapter adapter; // socket DatagramSocket sendSocket = null; InetAddress serverAddress = null; public XbyActivity() { super(); }

将下列代码改为python：try { DatagramSocket dsocket = new DatagramSocket(finalPort); dsocket.close(); } catch (SocketException e) { portList.add(finalPort); System.out.println("UDP端口" + finalPort + "开放"); } latch.countDown();

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