Java - Read line using InputStream [duplicate]

Question

I use InputStream to read some data, so I want to read characters until new line or '\n'.

Answer 1

TL;DR

Use BufferedReader within the try-with block, which will close the resource after finishing with it.

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It is possible to read the input stream with BufferedReader and with Scanner. If you don't have a good reason, it is better to use BufferedRead (for broad discussion BufferedReader vs Scanner see).

I would also suggest using the Buffered Reader with try-with-resources to make sure the resource are auto-closed. see

See the following code

try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
        while (reader.ready()) {
            String line = reader.readLine();
            System.out.println(line);
        }
    }catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

Answer 2

For files, the following will let you read each line:

import java.io.FileNotFoundException;
import java.util.Scanner;
import java.io.File;

public static void readText throws FileNotFoundException(){

     Scanner scan = new Scanner(new File("filename.txt"));

     while(scan.hasNextLine()){
         String line = scan.nextLine();

     }
}