How can I read and work on a textual file starting from its path in Java?

Question

I have the following task that have to be implemented in Java.

I have a String that represent the path of a txt file, something like this:

String fileFatturePa = "C:\\Users\\Andrea\\Desktop\\D150316.T1642\\myFile.txt";

This textual file contains some text (that represent XML but this is not important because I do not have to operate on it with something like XPath but I have to do simple substring operation).

So I need to read this textual file (starting from its path) and then I have to do some textual operation.

This file could be very big.

What is the best way to read it stargint from its path?

Answer 1

一个好的起点是 Oracle 的官方 Java 文档： Basic I/O 。

Answer 2

 BufferedReader reader = new BufferedReader(new FileReader(fileFatturePa));

        try
        {                           
            String line = null;         
            while ((line = reader.readLine()) != null)
            {
                  ***operations(specific to each line of the text file) ***
            }               
        }
        catch (IOException ex)
        {
            ex.printStackTrace();
        }               

        finally
        {
            reader.close();
        }           

Answer 3

Simple, you create a new File: File f = new File(path) . For raed all the lines, you can use the class Fileutils from Apache Commons IO. And you will have something like: List<String> allLines=Fileutils.readlines(f)