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| package com.lfh.UDP;
import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.SocketException; import java.util.ArrayList;
public class UDPServer { static int num = 0; static final Object someObject = new Object(); static ArrayList<Integer> port = new ArrayList<Integer>();
public static void main(String[] args) throws SocketException { UDPServer server = new UDPServer(); DatagramSocket serverSocket = new DatagramSocket(8800); System.out.println("监听在端口号:8800");
while (true) { try { byte[] dataLen = new byte[1024]; DatagramPacket packet = new DatagramPacket(dataLen, dataLen.length); serverSocket.receive(packet); String data = new String(packet.getData()); server.fileDeal(data, packet, serverSocket);
} catch (IOException e) { e.printStackTrace(); } }
}
private void fileDeal(String msg, DatagramPacket packet, DatagramSocket serverSocket) throws IOException { if (msg.trim().equals("help")) { String sentence = "upload+文件名:上传指定的文件;\n" + "delete+文件名:删除指定的文件;\n" + "update+文件名:更新指定的文件;\n" + "list all:文件列表;\n"; DatagramPacket datagramPacket = new DatagramPacket(sentence.getBytes(), sentence.getBytes().length, packet.getAddress(), packet.getPort()); serverSocket.send(datagramPacket); } else if (msg.trim().equals("show all")) { synchronized (UDPServer.someObject) { String allFilename = ""; File file = new File("D:\\Desktop\\Folder"); for (String filename : file.list()) { allFilename += filename + "\n"; } DatagramPacket datagramPacket = new DatagramPacket(allFilename.getBytes(), allFilename.getBytes().length, packet.getAddress(), packet.getPort()); serverSocket.send(datagramPacket);
} } else { String preMsg = msg.trim(); if (preMsg.contains(" ")) { String instructions = preMsg.substring(0, preMsg.indexOf(" ")); String filename = preMsg.substring(preMsg.indexOf(" ") + 1, preMsg.length()); if (instructions.equals("upload")) {
synchronized (UDPServer.someObject) { String storename = filename.substring(filename.lastIndexOf("/") + 1, filename.length()); File file = new File("D:/Desktop/Folder/" + storename); if (file.exists()) { String tips = "该文件已在服务端存在"; DatagramPacket datagramPacket = new DatagramPacket(tips.getBytes(), tips.getBytes().length, packet.getAddress(), packet.getPort()); serverSocket.send(datagramPacket); } else { File f = new File(filename); try (FileReader fr = new FileReader(f)) { char[] all = new char[(int) f.length()]; fr.read(all); File uploadfile = new File("D:/Desktop/Folder/" + storename); try (FileWriter fw = new FileWriter(uploadfile)) { fw.write(all); String tips = "写入文件成功"; DatagramPacket datagramPacket = new DatagramPacket(tips.getBytes(), tips.getBytes().length, packet.getAddress(), packet.getPort()); serverSocket.send(datagramPacket);
} catch (IOException e) {
String tips = "写入文件出错"; DatagramPacket datagramPacket = new DatagramPacket(tips.getBytes(), tips.getBytes().length, packet.getAddress(), packet.getPort()); serverSocket.send(datagramPacket);
}
} catch (IOException e) { String tips = "找不到该文件"; DatagramPacket datagramPacket = new DatagramPacket(tips.getBytes(), tips.getBytes().length, packet.getAddress(), packet.getPort()); serverSocket.send(datagramPacket); } } } } else if (instructions.equals("delete")) { synchronized (UDPServer.someObject) { File file = new File("D:/Desktop/Folder/" + filename); if (file.exists()) { if (file.delete()) {
String tips = "删除成功"; DatagramPacket datagramPacket = new DatagramPacket(tips.getBytes(), tips.getBytes().length, packet.getAddress(), packet.getPort()); serverSocket.send(datagramPacket);
} else {
String tips = "删除失败"; DatagramPacket datagramPacket = new DatagramPacket(tips.getBytes(), tips.getBytes().length, packet.getAddress(), packet.getPort()); serverSocket.send(datagramPacket);
}
} else { String tips = "该文件不存在"; DatagramPacket datagramPacket = new DatagramPacket(tips.getBytes(), tips.getBytes().length, packet.getAddress(), packet.getPort()); serverSocket.send(datagramPacket); } } } else if (instructions.equals("update")) { File file = new File("D:/Desktop/Folder/" + filename); if (file.exists()) {
String tips = "对不起,我还没想好怎么做这个接口"; DatagramPacket datagramPacket = new DatagramPacket(tips.getBytes(), tips.getBytes().length, packet.getAddress(), packet.getPort()); serverSocket.send(datagramPacket);
} else { String tips = "该文件不存在"; DatagramPacket datagramPacket = new DatagramPacket(tips.getBytes(), tips.getBytes().length, packet.getAddress(), packet.getPort()); serverSocket.send(datagramPacket); } } else if (instructions.equals("list")) { File file = new File("D:/Desktop/Folder/" + filename); if (file.exists()) { try (FileReader fileReader = new FileReader(file)) { char[] all = new char[(int) file.length()]; fileReader.read(all); String str = new String(all); DatagramPacket datagramPacket = new DatagramPacket(str.getBytes(), str.getBytes().length, packet.getAddress(), packet.getPort()); serverSocket.send(datagramPacket);
} catch (IOException e) { e.printStackTrace(); }
} else { String tips = "该文件不存在"; DatagramPacket datagramPacket = new DatagramPacket(tips.getBytes(), tips.getBytes().length, packet.getAddress(), packet.getPort()); serverSocket.send(datagramPacket); } } else { String tips = "命令有错误"; DatagramPacket datagramPacket = new DatagramPacket(tips.getBytes(), tips.getBytes().length, packet.getAddress(), packet.getPort()); serverSocket.send(datagramPacket); }
} else { String tips = "命令有错误"; DatagramPacket datagramPacket = new DatagramPacket(tips.getBytes(), tips.getBytes().length, packet.getAddress(), packet.getPort()); serverSocket.send(datagramPacket); } } } }
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