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...

Android Socket大文件断点上传实战：TCP UDP详解

在Java中，可以使用java.net.DatagramSocket类来处理UDP通信。对于大文件的断点上传，Android应用需要使用Socket实现与服务器之间的持久连接，并且能够记录文件上传的进度，以便在中断后从上次的位置继续上传。...

并发网络运算服务器：多客户端支持与实现

在这个例子中，客户端使用DatagramSocket类来发送和接收数据，指定了一个固定的端口（18888）和本地地址（"127.0.0.1"，通常用于测试，表示本地回环地址）。 3. 请求处理：客户端构造一个DatagramPacket对象，...

PaddleTS 是一个易用的深度时序建模的Python库，它基于飞桨深度学习框架PaddlePaddle，专注业界领先的深度模型，旨在为领域专家和行业用户提供可扩展的时序建模能力和便捷易用的用户体验

PaddleTS 是一个易用的深度时序建模的Python库，它基于飞桨深度学习框架PaddlePaddle，专注业界领先的深度模型，旨在为领域专家和行业用户提供可扩展的时序建模能力和便捷易用的用户体验。

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

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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