我在从Android应用程序向web服务（Google Cloud和PHP）发出正确的POST请求时遇到了一些问题。
当我尝试从Android发送图像时，它会返回"200 OK"响应，但图像不会保存在谷歌云存储的存储桶中。我知道问题出在我的方法在Android应用程序中的POST请求上，因为我已经用Postman进行了测试，并使其顺利工作。因此，我的应用程序中的以下代码出现了问题：
public void uploadFile(String uploadUrl, String filename, String newFileName) throws IOException {
FileInputStream fileInputStream = new FileInputStream(new File(filename));
URL url = new URL(uploadUrl);
connection = (HttpURLConnection) url.openConnection();
// Allow Inputs & Outputs.
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setUseCaches(false);
// Set HTTP method to POST.
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
outputStream = new DataOutputStream(connection.getOutputStream() );
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
outputStream.writeBytes("Content-Disposition: form-data; name='"img'";filename='"" + filename + "'"" + lineEnd);
outputStream.writeBytes(lineEnd);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// Read file
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
outputStream.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// Responses from the server (code and message)
int serverResponseCode = connection.getResponseCode();
String serverResponseMessage = connection.getResponseMessage();
System.out.println(serverResponseMessage);
System.out.println(serverResponseCode);
fileInputStream.close();
outputStream.flush();
outputStream.close();
}
我已经测试过所有的参数都是100%正确的，所以你不需要担心。
如果您需要查看web服务中的PHP代码来接收请求，那么它就是：
<?php
$img = $_FILES['img']['tmp_name'];
move_uploaded_file($img, 'gs://routeimages/yeeeeeeees.jpg');
echo "done";
?>
此代码中的问题可能在哪里？
附加
除了文件/图像之外，我还需要添加一些文本。如何将其添加到请求中？
看起来您缺少要发送的图像文件的Content-type。
查看以下用于发送文件的HTTPPost标头
Content-type: multipart/form-data, boundary=AaB03x
--AaB03x
content-disposition: form-data; name="pics", filename="file2.gif"
Content-type: image/gif
Content-Transfer-Encoding: binary
...contents of file2.gif...
--AaB03x--
因此，您需要在代码中添加Content-type属性，如下所示：
outputStream = new DataOutputStream(connection.getOutputStream() );
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
outputStream.writeBytes("Content-Disposition: form-data; name='"img'";filename='"" + filename + "'"" + lineEnd);
outputStream.writeBytes("Content-type: image/gif" + lineEnd); // or whatever format you are sending.
outputStream.writeBytes("Content-Transfer-Encoding: binary" + lineEnd);
outputStream.writeBytes(lineEnd);
我希望这段代码能帮你解决问题。
附加：除了文件/图像之外，我还需要添加一些文本。如何将其添加到请求中对于发送一些额外的参数（一些文本），请查看以下http格式，该格式将发送图像和文本参数：
Content-type: multipart/form-data, boundary=AaB03x
--AaB03x
content-disposition: form-data; name="pics", filename="file2.gif"
Content-type: image/gif
Content-Transfer-Encoding: binary
...contents of file2.gif...
--AaB03x--
content-disposition: form-data; name="field1"
Joe Blow
--AaB03x
我希望你现在可以在上面的图片上传解释和这种格式的帮助下编写额外参数的代码。
为什么不使用Volley库？它的方式更简单、更干净。像这个例子：
private void uploadImage(){
//Showing the progress dialog
final ProgressDialog loading = ProgressDialog.show(this,"Uploading...","Please wait...",false,false);
StringRequest stringRequest = new StringRequest(Request.Method.POST, UPLOAD_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String s) {
//Disimissing the progress dialog
loading.dismiss();
//Showing toast message of the response
Toast.makeText(MainActivity.this, s , Toast.LENGTH_LONG).show();
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
//Dismissing the progress dialog
loading.dismiss();
//Showing toast
Toast.makeText(MainActivity.this, volleyError.getMessage().toString(), Toast.LENGTH_LONG).show();
}
}){
@Override
protected Map<String, String> getParams() throws AuthFailureError {
//Converting Bitmap to String
String image = getStringImage(bitmap);
//Getting Image Name
String name = editTextName.getText().toString().trim();
//Creating parameters
Map<String,String> params = new Hashtable<String, String>();
//Adding parameters
params.put(KEY_IMAGE, image);
params.put(KEY_NAME, name);
//returning parameters
return params;
}
};
//Creating a Request Queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue.add(stringRequest);
}
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