【发布时间】：2014-06-12 08:43:07
【问题描述】：
我想将图像从我的 android 应用程序上传到服务器。我不知道问题出在我正在使用的代码中——它应该可以工作！ -。这是我第一次这样做，所以我对此知之甚少。
该代码没有捕获任何异常，但它从未进入服务器响应为“200”的 if 语句......并且永远不会上传图像。
您能回答以下问题吗？
1) 这个属性是什么意思？
conn.setRequestProperty("uploaded_file", "Thumbnail"+user_id);
2) 为什么这行的意思是？我知道它会使用数据输出流写入服务器，但是里面的参数是什么？
dos.writeBytes("Content-Disposition: form-data; name=uploaded_file;filename=Thumbnail"+
user_id+ lineEnd);
============
public void upload_to_server(File [] sdDirList, int fileIndex) throws IOException
{
final ProgressDialog dialog = ProgressDialog.show(SettingsActivity.this, "", "Uploading Image...", true);
final String upLoadServerUri = "server side php script goes here";
//***File path ***//
final String uploadFilePath = sdDirList[fileIndex].getCanonicalPath();
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(SettingsActivity.this, uploadFilePath,
Toast.LENGTH_SHORT).show();
}
});
//***Display the dialog of the upload state***//
new Thread(new Runnable()
{
//Sending thread
public void run()
{
dialog.show();
String fileName = uploadFilePath;
int serverResponseCode = 0;
HttpURLConnection conn = null;
DataOutputStream dos = null;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
File sourceFile = new File(uploadFilePath);
if (!sourceFile.isFile())
{
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(SettingsActivity.this, "File is not valid..",
Toast.LENGTH_SHORT).show();
}
});
dialog.dismiss();
return;
}
else
{
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(SettingsActivity.this, "Entered else block",
Toast.LENGTH_SHORT).show();
}
});
try
{
// open a URL connection to the Servlet
FileInputStream fileInputStream = new FileInputStream(sourceFile);
URL url = new URL(upLoadServerUri);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true); // Allow Inputs
conn.setDoOutput(true); // Allow Outputs
conn.setUseCaches(false); // Don't use a Cached Copy
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("ENCTYPE", "multipart/form-data");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
conn.setRequestProperty("uploaded_file", "Thumbnail"+user_id);
dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=uploaded_file;filename=Thumbnail"+
user_id+ 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);
// Responses from the server (code and message)
serverResponseCode = conn.getResponseCode();
String serverResponseMessage = conn.getResponseMessage();
Log.i("uploadFile", "HTTP Response is : "
+ serverResponseMessage + ": " + serverResponseCode);
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(SettingsActivity.this, "reached reponses's if",
Toast.LENGTH_SHORT).show();
}
});
if(serverResponseCode == 200)
{
runOnUiThread(new Runnable() {
public void run()
{
Toast.makeText(SettingsActivity.this, "File Upload Complete.",
Toast.LENGTH_SHORT).show();
}
});
}
//close the streams //
fileInputStream.close();
dos.flush();
dos.close();
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(SettingsActivity.this, "End of Try",
Toast.LENGTH_SHORT).show();
}
});
}
catch (MalformedURLException ex)
{
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(SettingsActivity.this, "in first catch",
Toast.LENGTH_SHORT).show();
}
});
dialog.dismiss();
ex.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(SettingsActivity.this, "MalformedURLException",
Toast.LENGTH_SHORT).show();
}
});
Log.e("Upload file to server", "error: " + ex.getMessage(), ex);
}
catch (Exception e)
{
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(SettingsActivity.this, "in second catch",
Toast.LENGTH_SHORT).show();
}
});
dialog.dismiss();
e.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(SettingsActivity.this, "Something went wrong..",
Toast.LENGTH_SHORT).show();
}
});
Log.e("Upload file to server Exception", "Exception : "
+ e.getMessage(), e);
}
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(SettingsActivity.this, "end of else",
Toast.LENGTH_SHORT).show();
}
});
dialog.dismiss();
} // End else block
}
}).start();
}
=============================
PHP 脚本：
<?php
$file_path = "uploads/";
$file_path = $file_path . basename( $_FILES['uploaded_file']['name']);
if(move_uploaded_file($_FILES['uploaded_file']['tmp_name'], $file_path)) {
echo "success";
} else{
echo "fail";
}
?>
【问题讨论】：