How to read data from a text file into an array?

Question

Good day. Now there is an array of source folders:

Path[] paths = new Path[4]; paths[0] = Paths.get("\\\\komp\\D$\\logs"); paths[1] = Paths.get("\\\\komp\\D$\\logs2"); paths[2] = Paths.get("\\\\komp\\D$\\logs3"); paths[3] = Paths.get("\\\\komp\\D$\\logs4");

and one recipient folder:

 Path target = Paths.get("D:\\MyLogs\\");

There is a file Setting.txt, where these paths are contained line by line:

 \\\\komp\\D$\\logs \\\\komp\\D$\\logs2 \\\\komp\\D$\\logs3 \\\\komp\\D$\\logs4 D:\\MyLogs

Please show how to read these lines from a file and insert it into my code, so that there would be something like:

 Path[] paths = new Path[4]; paths[0] = Paths.get("Первая строка из файла Setting.txt"); paths[1] = Paths.get("Вторая строка из файла Setting.txt"); paths[2] = Paths.get("Третья строка из файла Setting.txt"); paths[3] = Paths.get("Четвёртая строка из файла Setting.txt");

and one recipient folder:

 Path target = Paths.get("Пятая строка из файла Setting.txt");

It is necessary to read one line from the file, then repeat five times.
Understandably, just a few questions here with each of which is easier to understand separately.

Accepted Answer · 2017-01-26T09:08:51

You just need to read the file line by line. Here's how to implement it:

 // метод возвращает строки из файла в массиве String[] // fileName - имя файла // linesAmount - кол-во. строк, которые необходимо считать из файла (в вашем случае - 5) public String[] getLinesFromFile(String fileName, int linesAmount) { String[] lines = new String[linesAmount]; try (BufferedReader reader = new BufferedReader( new InputStreamReader(new FileInputStream(fileName), Charset.forName("КОДИРОВКА_ВАШЕГО_ФАЙЛА")))) { String line; int i = 0; while ((line = reader.readLine()) != null && i < linesAmount) { lines[i++] = line; } } catch (IOException e) { e.printStackTrace(); } return lines; }

Now in your code:

 String[] lines = getLinesFromFile("Setting.txt", 5); Path[] paths = new Path[4]; paths[0] = Paths.get(lines[0]); paths[1] = Paths.get(lines[1]); paths[2] = Paths.get(lines[2]); paths[3] = Paths.get(lines[3]); Path target = Paths.get(lines[4]);

All the time, he swears at the line: FileInputStream (fileName), To be honest, I myself don’t understand what the FileInputStream is, but the idea asks to close it.
I / O streams are a separate topic, which I think is best dealt with separately.
I think the problem is in the Language level of your project in IDEA.
If you describe the error in more detail, I can give you a solution.
Simply new FileInputStream (fileName) is underlined in red, it is written on hover: Clouse this "FileInputStream".
@Alex, look in IDEA -> File -> Project Structure -> Project -> Project language level.

Answer 2 · 2017-01-26T10:19:02

I understand you need to read and write them to an array? Here is the code: where value is the line number; rail is the path to the file; MaxInt is the maximum
the number of read lines; everything checked, works!

|| ------------------------------------------------ --- ||

 import java.io.BufferedReader; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; public class НовыйClass { public static String rail = "C://Setting.txt"; public static int MaxInt = 6; public static String ReadLocal (int value) throws FileNotFoundException, IOException{ File Setting = new File(rail); FileReader reader = new FileReader(Setting); BufferedReader br = new BufferedReader(reader); String b = br.readLine(); byte i = 0; while (i < value-1) { b = br.readLine(); i++; if (i-1 == value-1) { return b; } } br.close(); reader.close(); return b; } //и второй отрывок кода,будет помещать прочтенное в массив. public static void AddArray() throws IOException{ String[] OutPut = new String[MaxInt]; for (int i = 0; i < MaxInt; i++) { OutPut[i] = ReadLocal(i); } System.out.println(OutPut[1]+ "\n" + OutPut[2]+ "\n" + OutPut[3]+ "\n" + OutPut[4]+ "\n" + OutPut[5]+ "\n"); } } '

|| ------------------------------------------------ --- || good luck

How to read data from a text file into an array?

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