Java - Read line using InputStream

You should use BufferedReader with FileInputStreamReader if your read from a file

BufferedReader reader = new BufferedReader(new FileInputStreamReader(pathToFile));

or with InputStreamReader if you read from any other InputStream

BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));

Then use its readLine() method in a loop

while(reader.ready()) {
     String line = reader.readLine();
}

But if you really love InputStream then you can use a loop like this

InputStream stream; 
char c; 
String s = ""; 
do {
   c = stream.read(); 
   if (c == '\n')
      break; 
   s += c + "";
} while (c != -1);

TL;DR

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

---

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();
    }

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();

     }
}