我创建了一个应用程序，使用它可以将存储在手机图库中的图像上传到服务器。我使用的服务器端语言是 PHP。我面临的问题有点奇怪。我可以上传使用手机相机拍摄的小于 2 MB 的照片。但是某些照片没有上传。以下是未上传照片的详细信息：
第一张照片：
标题：2013-03-15 09.17.22.jpg
类型：JPEG
大小：2645Kb
第二张照片：
标题：2013-03-12 11.48.04.jpg
类型：JPEG
大小：2781Kb
在上传上述照片不成功后，我尝试上传另一张照片，它成功了。以下是我能够上传的照片的详细信息：
标题：2013-03-14 10.20.16.jpg
类型：JPEG
大小：1238Kb
然后尝试使用少于 2000 kb 的其他几张照片，所有这些照片都上传了。
然后我从网上下载了一张 6 MB 的 jpg 图片并尝试上传。莫名其妙就上传了。现在我完全糊涂了，真正的问题是什么。最后我得出一个结论，问题只在于那些使用我手机的相机拍摄的并且大小超过 2000 kb 的照片。
这是我用来将照片上传到服务器的 android 函数：
public String doFileUpload(String selectedPath,String page)
{
String response=null;
HttpURLConnection conn = null;
DataOutputStream dos = null;
DataInputStream inStream = null;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1*1024*1024;
String urlString = Connector.URL+page;
try
{
//------------------ CLIENT REQUEST
FileInputStream fileInputStream = new FileInputStream(new File(selectedPath) );
// open a URL connection to the Servlet
URL url = new URL(urlString);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
// Allow Inputs
conn.setDoInput(true);
// Allow Outputs
conn.setDoOutput(true);
// Don't use a cached copy.
conn.setUseCaches(false);
// Use a post method.
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=" + selectedPath + "" + lineEnd);
dos.writeBytes(lineEnd);
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form...
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);
}
// send multipart form data necesssary after file data...
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// close streams
fileInputStream.close();
dos.flush();
dos.close();
}
catch (MalformedURLException ex)
{
Log.e("Debug", "error: " + ex.getMessage(), ex);
}
catch (IOException ioe)
{
Log.e("Debug", "error: " + ioe.getMessage(), ioe);
}
//------------------ read the SERVER RESPONSE
try
{
inStream = new DataInputStream ( conn.getInputStream() );
response = inStream.readLine();
inStream.close();
}
catch (IOException ioex){
Log.e("Debug", "error: " + ioex.getMessage(), ioex);
}
return response;
}
这是我用来上传图片的页面的 PHP 代码：
<?php
$tt=$_GET["id"];
// Where the file is going to be placed
$target_path = "uploads/";
/* Add the original filename to our target path.
Result is "uploads/filename.extension" */
$target_path = $target_path . basename( $_FILES['uploadedfile']['name']);
if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path))
{
include("../../classes/Registration.php");
$Obj=new register();
$Obj->insert_photo_data($tt,basename( $_FILES['uploadedfile']['name']));
}
else
{
echo '[{"flag":"0"}]';
}
?>
当图像上传问题发生时，我得到的是：
[{"flag":"0"}]