fileoutputstream

问题 I am trying to get Japanese input from a JTextField (with the getText() method) and saving that to a File. I am confident that it does get Japanese format from the JTextField since I can append() that String to a JTextArea and it will be in the correct Japanese Format. However, when I try to write to a File it only turns to gibberish! I have tried to use an OutputStreamWriter instantiated with StandardCharsets.UTF_8 and I have tried with a plain FileOutputStream where I send in the bytes from

问题 In Reference to this android file download problem Can anyone explain what does this line mean in the code FileOutputStream f = new FileOutputStream(new File(root,"Video.mp4")); And what does it mean by the parameter root within the File() . Do I need to specify the root path to save the file? If it is the case then how do we specify the root path in android ? Regards 回答1: And what does it mean by the parameter root within the File(). Do I need to specify the root path to save the file? if it

问题 1)Target set to Android Q with ""android.permission.WRITE_EXTERNAL_STORAGE"" 2) use getExternalStorageDirectory or getExternalStoragePublicDirectory and FileOutputStream(file) saving file throws java.io.FileNotFoundException: /storage/emulated/0/myfolder/mytext.txt: open failed: ENOENT (No such file or directory) 3) use getExternalFilesDir api and saving is success but wont show up even after MediaScannerConnection.scanFile. /storage/emulated/0/Android/data/my.com.ui/files/Download/myfolder

问题 1)Target set to Android Q with ""android.permission.WRITE_EXTERNAL_STORAGE"" 2) use getExternalStorageDirectory or getExternalStoragePublicDirectory and FileOutputStream(file) saving file throws java.io.FileNotFoundException: /storage/emulated/0/myfolder/mytext.txt: open failed: ENOENT (No such file or directory) 3) use getExternalFilesDir api and saving is success but wont show up even after MediaScannerConnection.scanFile. /storage/emulated/0/Android/data/my.com.ui/files/Download/myfolder

问题 I am confused about this. Since when doing implementation of Serializable class, we need to use classes like FileOutputStream , ObjectOutputStream or something like that. Then why not we just use those classes to do things like output a object to a file and input a object from a file to maintain the status of a object directly? Why should we first implement Serializable and then do the same thing? 回答1: Understand it like this... Serializable is marker interface which denotes that the object

问题 I have an app that saves into a file (internal storage) data input by the user and at startup it loads this file and shows the contents. I would like to know: where can I find my file ( data.txt )? In addition, if I input "Hello" and then "World" when I load the file, I see "HelloWorld" in the same line but I want "Hello" and "World" printed on two different lines. For saving file: public void writeToFile(String data) { try { FileOutputStream fou = openFileOutput("data.txt", MODE_APPEND);

问题 I have created a file with an asynctask. Afterwards scheduled an executor to write information to said file once every second. Once I touch a button the executor is shut down and the file closed but more often than not nothing is written in the file. Code: startButton.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { preferences.edit().putBoolean(GlobalConstants.stopPreference,false).commit(); loc_thr = new LocationThread(preferences, getApplicationContext()); loc

问题 I am trying to make app with set as ringtone feature but I got a problem. When I Set as ringtone once it's working. But when I try to set as ringtone for second time, nothing happens. Now the problem is because file already exist. How can I set my code to like...If file already exist proceed to next step Here is my code: private File rsound; private final File rpath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_RINGTONES); private void s1ring() { Boolean success =

问题 In my spring project, one of my service classes has this method to save a file named database.properties in disk: public void create_properties(String maquina, String usuario, String senha) { System.out.println("create_properties"); Properties props = new Properties(); props.setProperty("jdbc.Classname", "org.postgresql.Driver"); props.setProperty("jdbc.url", "jdbc:postgresql://"+maquina+"/horario" ); props.setProperty("jdbc.user", usuario ); props.setProperty("jdbc.pass", senha ); props

问题 Here is my snippet. File file = new File(Thread.currentThread().getName()); for(each element of the list){ createStringWriterAndPopulateDataToBeWritten FileOutputStream fo = new FileOutputStream(file); OutputStreamWriter out = new OutputStreamWriter(fo,"UTF-8"); out.write(sw.toString()); out.close(); } Now say i have a newFixedThreadPool of size S ; i pass this thread pool a list of work to be done. Now everytime a thread is called, it creates a file with name as the name of thread and then