Java Reader Read Line readLines(Reader input)

Description

read Lines

License

Open Source License

Declaration

public static List<String> readLines(Reader input) throws IOException 

Method Source Code

//package com.java2s;

import java.io.BufferedReader;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.Reader;

import java.util.ArrayList;
import java.util.List;

public class Main {
    /**/*from   www.  ja v a2 s  .c o m*/
     * Get the contents of an <code>InputStream</code> as a list of Strings,
      * one entry per line, using the specified character encoding.
      * 
     * @param file
     * @param encoding
     * @return
     * @throws IOException
     */
    public static List<String> readLines(File file, String encoding) throws IOException {
        InputStreamReader reader = null;
        try {
            reader = new InputStreamReader(openInputStream(file), encoding);
            return readLines(reader);
        } finally {
            reader.close();
        }
    }

    public static List<String> readLines(Reader input) throws IOException {
        BufferedReader reader = new BufferedReader(input);
        List<String> list = new ArrayList<String>();
        String line = reader.readLine();
        while (line != null) {
            list.add(line);
            line = reader.readLine();
        }
        return list;
    }

    /**
      * Opens a {@link FileInputStream} for the specified file, providing better
      * error messages than simply calling <code>new FileInputStream(file)</code>.
      * <p>
      * At the end of the method either the stream will be successfully opened,
      * or an exception will have been thrown.
      * <p>
      * An exception is thrown if the file does not exist.
      * An exception is thrown if the file object exists but is a directory.
      * An exception is thrown if the file exists but cannot be read.
      * 
      * @param file  the file to open for input, must not be <code>null</code>
      * @return a new {@link FileInputStream} for the specified file
      * @throws FileNotFoundException if the file does not exist
      * @throws IOException if the file object is a directory
      * @throws IOException if the file cannot be read
      */
    public static FileInputStream openInputStream(File file) throws IOException {
        if (file.exists()) {
            if (file.isDirectory()) {
                throw new IOException("File '" + file + "' exists but is a directory");
            }
            if (file.canRead() == false) {
                throw new IOException("File '" + file + "' cannot be read");
            }
        } else {
            throw new FileNotFoundException("File '" + file + "' does not exist");
        }
        return new FileInputStream(file);
    }
}

Related

1. readLines(Reader input)
2. readLines(Reader input)
3. readLines(Reader input)
4. readLines(Reader input)
5. readLines(Reader input)
6. readLines(Reader input)
7. readLines(Reader r, List lines)
8. readLines(Reader reader)
9. readLines(Reader reader)