如何扫描和打印文件内容？

Question

Using java, I need to make a program that asks the user which file to scan, and to do some work with the data in the file.

My program is supposed to select a file, scan the file for a specific character that the user specifies, and return with how many specific characters there are in that file.

This is my code so far:

import java.io.*;
import java.util.Scanner;

public class CharSearch {
    public static void main(String[] args) throws Exception{

    Scanner scanner = new Scanner(System.in);

    System.out.println("Enter the name of the file you want to search.");
    String fileInput = scanner.nextLine();

    System.out.println("What character would you like to look for in " + fileInput + "?");

    Scanner fileScanner = new Scanner(fileInput);
    System.out.println(fileScanner);
    }
}

I imported io and scanner, then set up the scanner to read which file the user inputs. I print back out that file name. The last two lines are where I need help. How can I make the scanner return with the data in the file.

There is a file in my folder called data.txt and all that is written in it is "dataWord." For starters, I want the scanner to read the file and the program to display dataWord, but its not working. I am a rookie, so please work with me. Thanks.

Answer 1

Instead of passing path of file as String pass it as a File

    Scanner fileScanner = new Scanner(new File(fileInput));
    while (fileScanner.hasNext()) {
        System.out.println(fileScanner.next());
    }
    scanner.close();
    fileScanner.close();

If the file is an external file or not in your project, you can specify the absolute path of file.

If it is in classpath you can read using ClassLoader

     java.io.InputStream inputStream = this.getClassLoader().getResourceAsStream("file_path")

Scanner has a constructor with InputStream