Reading and displaying data from a .txt file

Question

How do you read and display data from .txt files?

Answer 1

In Java 8, you can read a whole file, simply with:

public String read(String file) throws IOException {
  return new String(Files.readAllBytes(Paths.get(file)));
}

or if its a Resource:

public String read(String file) throws IOException {
  URL url = Resources.getResource(file);
  return Resources.toString(url, Charsets.UTF_8);
}

Answer 2

I love this piece of code, use it to load a file into one String:

File file = new File("/my/location");
String contents = new Scanner(file).useDelimiter("\\Z").next();

Answer 3

public class PassdataintoFile {

    public static void main(String[] args) throws IOException  {
        try {
            PrintWriter pw = new PrintWriter("C:/new/hello.txt", "UTF-8");
            PrintWriter pw1 = new PrintWriter("C:/new/hello.txt");
             pw1.println("Hi chinni");
             pw1.print("your succesfully entered text into file");
             pw1.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        BufferedReader br = new BufferedReader(new FileReader("C:/new/hello.txt"));
           String line;
           while((line = br.readLine())!= null)
           {
               System.out.println(line);
           }
           br.close();
    }

}

Answer 4

In general:

• Create a FileInputStream for the file.
• Create an InputStreamReader wrapping the input stream, specifying the correct encoding
• Optionally create a BufferedReader around the InputStreamReader, which makes it simpler to read a line at a time.
• Read until there's no more data (e.g. readLine returns null)
• Display data as you go or buffer it up for later.

If you need more help than that, please be more specific in your question.