Java Path File Read nio readAllLines(String path)

Description

Read file at path.

License

Open Source License

Parameter

Parameter	Description
path	path of file

Exception

Parameter	Description
IOException	If a non UTF-8 character is found, this exception isthrown.

Return

List of lines split by '\n' character.

Declaration

public static List<String> readAllLines(String path) throws IOException 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.io.BufferedReader;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

public class Main {
    /**/*  w ww .  ja  va 2s. c  o  m*/
     * Read file at path. Returns list of lines split by '\n' character.
     * 
     * Ensures file is in UTF-8.
     * 
     * @param path path of file
     * @return List of lines split by '\n' character.
     * @throws IOException If a non UTF-8 character is found, this exception is
     *             thrown.
     */
    public static List<String> readAllLines(String path) throws IOException {
        List<String> lines = new ArrayList<String>();

        CharsetEncoder encoder = Charset.forName(StandardCharsets.ISO_8859_1.toString()).newEncoder();
        boolean ignoreBOM = true; // https://en.wikipedia.org/wiki/Byte_order_mark
        BufferedReader br = null;
        String currentLine;
        int lineNumber = 1;
        try {
            br = new BufferedReader(new InputStreamReader(new FileInputStream(path), StandardCharsets.UTF_8));
            while ((currentLine = br.readLine()) != null) {
                if (!encoder.canEncode(currentLine) && !ignoreBOM) { // ensure line is UTF-8
                    throw new IOException(String.format("Line %d: \"%s\" not UTF-8", lineNumber, currentLine));
                }
                lines.add(currentLine.trim());
                ignoreBOM = false;
                ++lineNumber;
            }
        } finally {
            br.close();
        }

        return lines;
    }
}

Related

1. read(String aPathString)
2. read(String filePath)
3. read(String filePath)
4. read(String path)
5. readAllLines(Path path)
6. readAllLinesOrExit(Path path)
7. readAndConsume(String filePath, Consumer consumer)
8. readAsString(Path path)
9. readAsString(String path)