【发布时间】：2016-05-17 04:51:55
【问题描述】：
我讨厌发布像这样很长的代码示例，但我就是不知道为什么它不起作用，所以我唯一能想到的就是分享这些烂摊子。
我在这里遵循本指南： http://www.coderefer.com/android-upload-file-to-server/
我正在通过 webview 处理它，因此我必须对界面部分的工作方式进行一些更改，并且我必须添加一些代码以获得权限，因为我在 Marshmallow 上：
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
MY_PERMISSIONS_REQUEST_READ_CONTACTS);
但据我所知，一切都在 android 活动上正常工作，因为现在我获得了权限，因此我没有收到任何错误。
我在这里将我能够成功收集的路径传递给这个函数：
public int uploadFile(final String selectedFilePath){
int serverResponseCode = 0;
HttpURLConnection connection;
DataOutputStream dataOutputStream;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead,bytesAvailable,bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
File selectedFile = new File(selectedFilePath);
String[] parts = selectedFilePath.split("/");
final String fileName = parts[parts.length-1];
if (!selectedFile.isFile()){
// dialog.dismiss();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this,"Source File Doesn't Exist: " + selectedFilePath,Toast.LENGTH_SHORT).show();
}
});
return 0;
}else{
try{
FileInputStream fileInputStream = new FileInputStream(selectedFile);
URL url = new URL(SERVER_URL);
connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);//Allow Inputs
connection.setDoOutput(true);//Allow Outputs
connection.setUseCaches(false);//Don't use a cached Copy
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("ENCTYPE", "multipart/form-data");
connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
connection.setRequestProperty("uploaded_file",selectedFilePath);
//creating new dataoutputstream
dataOutputStream = new DataOutputStream(connection.getOutputStream());
//writing bytes to data outputstream
dataOutputStream.writeBytes(twoHyphens + boundary + lineEnd);
dataOutputStream.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\""
+ selectedFilePath + "\"" + lineEnd);
dataOutputStream.writeBytes(lineEnd);
//returns no. of bytes present in fileInputStream
bytesAvailable = fileInputStream.available();
//selecting the buffer size as minimum of available bytes or 1 MB
bufferSize = Math.min(bytesAvailable,maxBufferSize);
//setting the buffer as byte array of size of bufferSize
buffer = new byte[bufferSize];
//reads bytes from FileInputStream(from 0th index of buffer to buffersize)
bytesRead = fileInputStream.read(buffer,0,bufferSize);
//loop repeats till bytesRead = -1, i.e., no bytes are left to read
while (bytesRead > 0){
//write the bytes read from inputstream
dataOutputStream.write(buffer,0,bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable,maxBufferSize);
bytesRead = fileInputStream.read(buffer,0,bufferSize);
}
dataOutputStream.writeBytes(lineEnd);
dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
serverResponseCode = connection.getResponseCode();
String serverResponseMessage = connection.getResponseMessage();
final String result = getStringFromInputStream(connection.getInputStream());
//Log.i(TAG, "Server Response is: " + serverResponseMessage + ": " + serverResponseCode);
//response code of 200 indicates the server status OK
if(serverResponseCode == 200){
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this,result,Toast.LENGTH_SHORT).show();
}
});
}
//closing the input and output streams
fileInputStream.close();
dataOutputStream.flush();
dataOutputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this,"File Not Found",Toast.LENGTH_SHORT).show();
}
});
} catch (MalformedURLException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "URL error!", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "Cannot Read/Write File!", Toast.LENGTH_SHORT).show();
}
// dialog.dismiss();
return serverResponseCode;
}
}
我能够使用他的 php 方法从我的服务器返回“失败”响应：
$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";
}
?>
但是，在我看来 $_FILES['uploaded_file'] 是空的，因为我每次都会收到失败作为响应。当我在其上使用 var_dump($_FILES['uploaded_file']) 时，我从输入流中得到了它为空的 toast 消息。什么都没有得救。我正在尝试发送不超过 100kb 的小图片，并且可以通过浏览器上传图片。
非常感谢您提供任何帮助，感谢您的宝贵时间！
【问题讨论】：
-
在
ini_set('memory_limit', '512M');987654325@等php文件中添加文件大小限制 -
如果没有成功，然后尝试从android代码中删除
connection.setRequestProperty("ENCTYPE", "multipart/form-data");和connection.setRequestProperty("uploaded_file",selectedFilePath);行。 -
感谢您的回复。我尝试了这两种方法，但不幸的是没有成功。仍然从我的 var 转储中获取 null。
-
尝试将 end
dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);替换为dataOutputStream.writeBytes(twoHyphens + boundary + lineEnd); -
那里也没有运气。
标签： php android stream httpurlconnection