PHP can not find files in windows - php

Question

I have build a server use PHP based on WAMP Server on my windows 10 computer. what I want to do is when I send a GET request, the show_files.php should return a JSON object to me. The JSON object contains file names in path F:\NetEaseMusic\download on my computer. Then I use a file name to send a POST request to download_file.php and it returns a data stream so that I can download file. When I use HttpURLConnection, everything works well. However, when I try send the POST request use socket, download_file.php can get the file_name param, but it can not find the target file in F:\NetEaseMusic\download. I show the code.
this is
this is download_file.php
<?php
if(empty($_POST["file_name"]))
{
echo "NO_FILE_NAME\n";
print_r($_POST);
exit();
}
$path = iconv("utf-8", "GB2312","F:\\NetEaseMusic\\download\\".$_POST["file_name"]);
//$path = "F:\\NetEaseMusic\\download\\".$_POST["file_name"];
if (!file_exists ( $path )) {
echo "FILE_NOT_FOUND\n";
echo "F:\\NetEaseMusic\\download\\".$_POST["file_name"]."\n";
print($path);
exit ();
}
$file_size = filesize($path);
//header("Content-type: application/octet-stream");
//header("Accept-Ranges: bytes");
//header("Accept-Length:".$file_size);
//header("Content-Disposition: attachment; filename=".$path);
$file = fopen($path, "r");
while(!feof($file))
{
echo fread($file, 1024);
}
exit();
?>
this is my Client code which to download file. First of all I build a HTTP POST request,
private void downloadFileBySocket(String urlString, String fileName)
{
try{
StringBuilder sb = new StringBuilder();
String data = URLEncoder.encode("file_name", "utf-8") + "=" + URLEncoder.encode(fileName, "utf-8") + "\r\n";
//String data = "&file_name="+fileName;
sb.append("POST " + urlString + " HTTP/1.1\r\n");
sb.append("Host: 10.206.68.242\r\n");
sb.append("Content-Type: application/x-www-form-urlencoded\r\n");
sb.append("Content-Length: " + data.length() + "\r\n");
sb.append("\r\n");
sb.append(data + "\r\n");
//sb.append( URLEncoder.encode("file_name", "utf-8") + "=" + URLEncoder.encode(fileName, "utf-8") + "\r\n");
System.out.println(sb.toString());
URL url = new URL(urlString);
Socket socket = new Socket(url.getHost(), url.getPort());
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "utf-8"));
writer.write(sb.toString());
writer.flush();
File file = new File("./" + fileName);
DataOutputStream out = null;
DataInputStream in = null;
try{
out = new DataOutputStream(new FileOutputStream(file));
in = new DataInputStream(socket.getInputStream());
byte[] buffer = new byte[1024];
int readBytes = 0;
while((readBytes = in.read(buffer)) != -1)
{
out.write(buffer, 0, readBytes);
}
out.flush();
}catch (Exception e1)
{
e1.printStackTrace();
}finally {
try{
if(in != null)
{
in.close();
}
if(out != null)
{
out.close();
}
}catch (Exception e2)
{
e2.printStackTrace();
}
}
socket.close();
}catch (Exception e)
{
e.printStackTrace();
}
}
and my main[] method
public static void main(String[] args)
{
SocketTest socketTest = new SocketTest();
socketTest.downloadFileBySocket(SocketTest.downloadFileUrl, "小胡仙儿 - 【二胡】霜雪千年.mp3");
}

Answer 1

Simple way:
using System.Net;
WebClient webClient = new WebClient();
webClient.DownloadFile("example.com/myfile.txt", #"c:/myfile.txt");