import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;

public class FileReadExample {

    public List<String> readAllLines(String filePath) throws IOException {

        // Java7以降(NIO2利用)
        return Files.readAllLines(Paths.get(filePath), StandardCharsets.UTF_8);
    }

    public List<String> readAllLinesOld(String filePath) throws IOException {

        // Java6以下の場合
        // (StandardCharsetsもJava7から)
        BufferedReader reader = new BufferedReader(
                new InputStreamReader(new FileInputStream(filePath), "UTF-8"));

        List<String> allLines = new ArrayList<>();

        try {
            String line;
            while ((line = reader.readLine()) != null) {
                allLines.add(line);
            }

            return allLines;

        } finally {
            reader.close();
        }
    }
}