我成功地将文本文件从（json_string）写入Android手机的内部存储器，但是我写给PHP服务器的同一文件正在上传空白。请看下面的代码，让我知道我哪里错了？请帮助我，我是PHP和Android的新手。
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity.java";
private static final int SURVEY_REQUEST = 1337;
private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
verifyStoragePermissions(this); // for permission in marshallow and up operating system
//buttons
Button button_survey_example_1 = (Button) findViewById(R.id.button_survey_example_1);
button_survey_example_1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i_survey = new Intent(MainActivity.this, SurveyActivity.class);
//you have to pass as an extra the json string.
i_survey.putExtra("json_survey", loadSurveyJson("feedback1.json"));
startActivityForResult(i_survey, SURVEY_REQUEST);
}
});
}
public static void verifyStoragePermissions(Activity activity) {
// Check if we have read or write permission
int writePermission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE);
int readPermission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.READ_EXTERNAL_STORAGE);
if (writePermission != PackageManager.PERMISSION_GRANTED || readPermission != PackageManager.PERMISSION_GRANTED) {
// We don't have permission so prompt the user
ActivityCompat.requestPermissions(
activity,
PERMISSIONS_STORAGE,
REQUEST_EXTERNAL_STORAGE
);
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
File file = null;
if (requestCode == SURVEY_REQUEST) {
if (resultCode == RESULT_OK) {
String answers_json = data.getExtras().getString("answers");
Log.d("****", "****************** WE HAVE ANSWERS ******************");
final int v = Log.v("ANSWERS JSON", answers_json);
Log.d("****", "*****************************************************");
final File path =
Environment.getExternalStoragePublicDirectory
(
//Environment.DIRECTORY_PICTURES
Environment.DIRECTORY_DOWNLOADS + "/QA/"
);
if (!path.exists()) {
// Make it, if it doesn't exit
path.mkdirs();
}
Date date = new Date();
file = new File(path, date + ".txt");
JsonFlattener parser = new JsonFlattener();
CSVWriter writer = new CSVWriter();
List<Map<String, String>> flatJson = null;
try {
flatJson = parser.parseJson(answers_json);
} catch (Exception e) {
e.printStackTrace();
}
try {
writer.writeAsCSV(flatJson, path + " " + date + ".csv");
// file = new File(path, date + ".csv");
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
file.createNewFile();
FileOutputStream fOut = new FileOutputStream(file);
OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
myOutWriter.append(answers_json);
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
FileBody fileBody = new FileBody(file);
builder.addPart("file", fileBody);
HttpEntity reqEntity = builder.build();
URL url = null;
try {
url = new URL("http://localhost/UploadToServer.php");
} catch (MalformedURLException e) {
e.printStackTrace();
}
HttpURLConnection conn = null;
try {
conn = (HttpURLConnection) url.openConnection();
} catch (IOException e) {
e.printStackTrace();
}
conn.setReadTimeout(10000);
conn.setConnectTimeout(15000);
conn.setRequestMethod("POST");
conn.setUseCaches(false);
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setRequestProperty("Connection", "Keep-Alive");
conn.addRequestProperty("Content-length", reqEntity.getContentLength()+"");
conn.addRequestProperty(reqEntity.getContentType().getName(), reqEntity.getContentType().getValue());
OutputStream os = conn.getOutputStream();
reqEntity.writeTo(conn.getOutputStream());
os.flush();
os.close();
conn.connect();
if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
Log.d("UPLOAD", "HTTP 200 OK.");
return readStream(conn.getInputStream(In));
This return returns the response from the upload.
} else {
Log.d("UPLOAD", "HTTP "+conn.getResponseCode()+" "+conn.getResponseMessage()+".");
String stream = readStream(conn.getInputStream());
Log.d("UPLOAD", "Response: "+stream);
return stream;
}
AlertDialog.Builder dlgAlert = new AlertDialog.Builder(this, R.style.MyDialogTheme);
dlgAlert.setMessage("Thank you for your time");
dlgAlert.setTitle("QA APP");
dlgAlert.setPositiveButton("Ok", null);
dlgAlert.setCancelable(true);
dlgAlert.create().show();
myOutWriter.close();
fOut.flush();
fOut.close();
} catch (IOException e) {
Log.e("Exception", "File write failed: " + e.toString());
}
}
}
}
我的PHP代码是
<?php
$name = $_FILES['file']['name'];
$temp_name = $_FILES['file']['tmp_name'];
if(isset($name)){
if(!empty($name)){
$location = 'upload/';
if(move_uploaded_file($temp_name, $location.$name)){
echo 'File uploaded successfully';
}
}
}
else {
echo 'failed !!';
}
?>
答案 0 :(得分：0)
我做到了。在我开始连接之前，我必须刷新OutStreamWriter
file.createNewFile();
FileOutputStream fOut = new FileOutputStream(file);
OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
myOutWriter.append(answers_json);
myOutWriter.close();
fOut.flush();
fOut.close();
现在它完全正常工作。感谢您使用此平台。