Question

朋友们，我试图将文件从Android设备上传到server.i尝试使用模拟器和localhost，但它无法正常工作。我在本地系统中使用wamp服务器。我上传文件的android代码如下。我需要将文件从模拟器上传到localsystem

upload.java

HttpURLConnection conn = null;
DataOutputStream dos = null;
DataInputStream inStream = null;
String existingFileName =FileName.getText().toString();
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary =  "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1*1024*1024;
//String responseFromServer = "";
String urlString="http://localhost/uploads/upload.php";

try
{

FileInputStream fileInputStream = new FileInputStream(new File(existingFileName) );
 // open a URL connection to the Servlet
 URL url = new URL(urlString);

 conn = (HttpURLConnection) url.openConnection();

 conn.setDoInput(true);

 conn.setDoOutput(true);

 conn.setUseCaches(false);

 conn.setRequestMethod("POST");
 conn.setRequestProperty("Connection", "Keep-Alive");
 conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);
 dos = new DataOutputStream( conn.getOutputStream() );
 dos.writeBytes(twoHyphens + boundary + lineEnd);
 dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + existingFileName + "\"" + lineEnd);
 dos.writeBytes(lineEnd);

 bytesAvailable = fileInputStream.available();
 bufferSize = Math.min(bytesAvailable, maxBufferSize);
 buffer = new byte[bufferSize];

 bytesRead = fileInputStream.read(buffer, 0, bufferSize);
 while (bytesRead > 0)
 {
  dos.write(buffer, 0, bufferSize);
  bytesAvailable = fileInputStream.available();
  bufferSize = Math.min(bytesAvailable, maxBufferSize);
  bytesRead = fileInputStream.read(buffer, 0, bufferSize);
 }

 dos.writeBytes(lineEnd);
 dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

 Log.e("Debug","File is written");
 fileInputStream.close();
 dos.flush();
 dos.close();
 Toast.makeText(Upload.this, "Files have been uploaded successfully",Toast.LENGTH_SHORT).show();
}
catch (MalformedURLException ex)
{
     Log.e("Debug", "error: " + ex.getMessage(), ex);
}
catch (IOException ioe)
{
     Log.e("Debug", "error: " + ioe.getMessage(), ioe);
}

try {
      inStream = new DataInputStream ( conn.getInputStream() );
      String str;

      while (( str = inStream.readLine()) != null)
      {
           Log.e("Debug","Server Response "+str);
      }
      inStream.close();

}
catch (IOException ioex)
{
     Log.e("Debug", "error: " + ioex.getMessage(), ioex);
}

这是我的PHP代码

upload.php的

<?php

 $target_path = "uploads/";

 $target_path = $target_path . basename( $_FILES['uploadedfile']['name']);

 if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) {
echo "The file ". basename( $_FILES['uploadedfile']['name']).
    " has been uploaded";
 } 

 else{
      echo "There was an error uploading the file, please try again!";
   }
   ?>

我在wamp文件夹的www目录中有一个名为uploads的文件夹。我需要将上传的文件存储在此文件夹中。

但是当我运行android程序时，它显示错误消息为

"java.net.Connect Exception: localhost/127.0.0.1:80 - Connection refused"

任何人都可以给我一个解决方案，让我知道我的编码足以实现我的目标。提前谢谢

Answer 1

user664525 从"java.net.Connect Exception: localhost/127.0.0.1:80 - Connection refused"开始，Android似乎试图引用自己的本地主机而不是服务器的地址。

您需要提供服务器机器的IP地址（在您的情况下是您自己的系统，例如192.168.40.24），而不是代码中的 localhost 。

Answer 2

在模拟器中，SDCard没有读/写/执行权限，遗憾的是无法为模拟器的SD卡设置这些权限。要测试您的代码，我建议您将文件放在应用程序的asset中，然后使用AssetManager获取该文件的参考并上传。

通过这种方式，您可以至少测试上传算法，我相信如果能够工作，它也适用于实际设备。

Answer 3

更改以下代码行：

String urlString="http://localhost/uploads/upload.php";

到

String urlString="http://10.0.2.2:portno/uploads/upload.php";

说明：

请注意，IP地址10.0.2.2是指Localmachine的IP地址。而localhost引用模拟器的IP本身。此外，“portno”通常是您的服务器服务通常运行的帖子80（默认情况下）..

HOPE这有助于!! !! ;）

使用模拟器和localsystem在android中上传文件

3 个答案: