Android File to Byte Array Read getBytes(File file)

Description

get Bytes

License

Apache License

Declaration

public static byte[] getBytes(File file) throws IOException 

Method Source Code

//package com.java2s;
/*/*from   w  w  w . ja v  a2s . c  om*/
 * Copyright 2004-2005 Germinus XXI, Liferay LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License")
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * This is a derived work from source code taken from Liferay.
 */

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;

import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

import java.util.Enumeration;

import java.util.Properties;

public class Main {
    public static byte[] getBytes(File file) throws IOException {
        if (file == null || !file.exists()) {
            return null;
        }

        ByteArrayOutputStream out = new ByteArrayOutputStream();
        FileInputStream in = new FileInputStream(file);

        int c = in.read();

        while (c != -1) {
            out.write(c);
            c = in.read();
        }

        in.close();
        out.close();

        return out.toByteArray();
    }

    public static boolean exists(String fileName) {
        File file = new File(fileName);

        return file.exists();
    }

    public static String read(String fileName) throws IOException {
        return read(new File(fileName));
    }

    public static String read(File file) throws IOException {
        BufferedReader br = new BufferedReader(new FileReader(file));

        StringBuffer sb = new StringBuffer();
        String line = null;

        while ((line = br.readLine()) != null) {
            sb.append(line).append('\n');
        }

        br.close();

        return sb.toString().trim();
    }

    public static void write(File file, String s) throws IOException {
        if (file.getParent() != null) {
            mkdirs(file.getParent());
        }

        BufferedWriter bw = new BufferedWriter(new FileWriter(file));

        bw.flush();
        bw.write(s);
        bw.flush();

        bw.close();
    }

    public static void write(String fileName, String s) throws IOException {
        write(new File(fileName), s);
    }

    public static void write(String pathName, String fileName, String s)
            throws IOException {

        write(new File(pathName, fileName), s);
    }

    public static void write(File dest, Properties props)
            throws IOException {
        write(dest, propertiesToString(props));
    }

    public static void mkdirs(String pathName) {
        File file = new File(pathName);
        file.mkdirs();
    }

    public static String propertiesToString(Properties p) {
        StringBuffer sb = new StringBuffer();

        Enumeration enu = p.propertyNames();

        while (enu.hasMoreElements()) {
            String key = (String) enu.nextElement();

            sb.append(key);
            sb.append("=");
            sb.append(p.getProperty(key));
            sb.append("\n");
        }

        return sb.toString();
    }
}

Related

1. getBytes(File file)
2. getBytesFromFile(File file)
3. getBytesFromFile(File file, long startPostion, long numberOfBytesToRead)
4. getFileAsByteArray(File file)
5. getFileAsByteArrayOutputStream( File file)