Question

How to convert an InputStream to String in Java

Answer 1

package javaapplication1;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.stream.Collectors;

public class JavaApplication1 {
 
    public static void main(String[] args) throws IOException {
 
        InputStream is = new FileInputStream("d://data.txt");

        String s = new BufferedReader(new InputStreamReader(is)).
                                                            lines().
                                                            collect(Collectors.joining("\n"));
        System.out.println(s);
     }
}
 
 
/*
 
run:
                    
java c c++ c# php 
javascript 
python
  
*/

 

70+ SQL courses for beginners and professionals

Answer 2

package javaapplication1;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.stream.Collectors;

public class JavaApplication1 {
 
    public static void main(String[] args) throws IOException {
 
        InputStream is = new FileInputStream("d://data.txt");

        String s = new BufferedReader(new InputStreamReader(is)).
                                                         lines().
                                                         parallel().
                                                         collect(Collectors.joining("\n"));
        
        System.out.println(s);
     }
}
 
 
/*
 
run:
                    
java c c++ c# php 
javascript 
python
  
*/

 

70+ SQL courses for beginners and professionals

Answer 3

package javaapplication1;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Scanner;

public class JavaApplication1 {
 
    public static void main(String[] args) throws IOException {
 
        InputStream is = new FileInputStream("d://data.txt");

        Scanner s = new Scanner(is).useDelimiter("\\A");
        
        String str = s.hasNext() ? s.next() : "";
        
        System.out.println(str);
     }
}
 
 
/*
 
run:
                    
java c c++ c# php 
javascript 
python
  
*/

 

70+ SQL courses for beginners and professionals