Java FileInputStream Read readFile(String filename)

Description

read File

License

Open Source License

Declaration

public static String readFile(String filename) throws Exception 

Method Source Code

//package com.java2s;
/**/*from w  w w.j  av  a 2  s . c  om*/
 * Copyright 2009, Google Inc.  All rights reserved.
 * Licensed to PSF under a Contributor Agreement.
 */

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

import java.io.IOException;
import java.io.InputStream;

public class Main {
    private static final String UTF_8 = "UTF-8";

    public static String readFile(String filename) throws Exception {
        return readFile(new File(filename));
    }

    public static String readFile(File path) throws Exception {
        // Don't use line-oriented file read -- need to retain CRLF if present
        // so the style-run and link offsets are correct.
        return new String(getBytesFromFile(path), UTF_8);
    }

    public static byte[] getBytesFromFile(File file) throws IOException {
        InputStream is = null;

        try {
            is = new FileInputStream(file);
            long length = file.length();
            if (length > Integer.MAX_VALUE) {
                throw new IOException("file too large: " + file);
            }

            byte[] bytes = new byte[(int) length];
            int offset = 0;
            int numRead = 0;
            while (offset < bytes.length
                    && (numRead = is.read(bytes, offset, bytes.length
                            - offset)) >= 0) {
                offset += numRead;
            }
            if (offset < bytes.length) {
                throw new IOException("Failed to read whole file " + file);
            }
            return bytes;
        } finally {
            if (is != null) {
                is.close();
            }
        }
    }
}

Related

1. readFile(String filename)
2. readFile(String filename)
3. readFile(String filename)
4. readFile(String fileName)
5. readFile(String fileName)
6. readFile(String filename)
7. readFile(String filename)
8. readFile(String fileName)
9. readFile(String fileName, String charset)