Example usage for java.io FileInputStream read

Introduction

In this page you can find the example usage for java.io FileInputStream read.

Prototype

public int read(byte b[], int off, int len) throws IOException 

Source Link

Document

Reads up to len bytes of data from this input stream into an array of bytes.

Usage

From source file:Main.java

public static String imgCacheRead(Context context, String cacheImgFileName) {
    int len = 1024;
    byte[] buffer = new byte[len];
    try {//from   www. j  a v  a  2 s  .  c o  m
        FileInputStream fis = context.openFileInput(cacheImgFileName);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        int nrb = fis.read(buffer, 0, len); // read up to len bytes
        while (nrb != -1) {
            baos.write(buffer, 0, nrb);
            nrb = fis.read(buffer, 0, len);
        }
        buffer = baos.toByteArray();
        fis.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {
        return new String(buffer, "utf-8");
    } catch (UnsupportedEncodingException e) {

        return null;
    }
}

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From source file:Main.java

public static String getFileHeader(String filePath) {
    FileInputStream is = null;
    String value = null;//from w ww  .jav a2  s .  c  om
    try {
        is = new FileInputStream(filePath);
        byte[] b = new byte[3];
        is.read(b, 0, b.length);
        value = bytesToHexString(b);
    } catch (Exception e) {
    } finally {
        if (null != is) {
            try {
                is.close();
            } catch (IOException e) {
            }
        }
    }
    return value;
}

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From source file:Main.java

/**
 * (java) read from file/*from   ww  w. ja v a2  s. c  om*/
 * 
 * @param path
 * @return
 */
public static String readFile(File file) {
    String str = "";
    FileInputStream in;
    try {
        in = new FileInputStream(file);
        int length = (int) file.length();
        byte[] temp = new byte[length];
        in.read(temp, 0, length);
        str = EncodingUtils.getString(temp, FILE_ENCODING);
        in.close();
    } catch (IOException e) {
        Log.e("", "read error!");

    }
    return str;
}

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From source file:Main.java

public static String getSHA(File f, int length) {
    if (!f.isFile() || length <= 0) {
        return null;
    }/* w w w  .  j  a  va 2  s.c o  m*/
    FileInputStream f1;
    byte[] buf = new byte[length];
    int n;
    try {
        f1 = new FileInputStream(f);
        n = f1.read(buf, 0, length);
        f1.close();
    } catch (IOException e) {
        return null;
    }
    return getSHA(buf);
}

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From source file:gov.nasa.arc.geocam.talk.UIUtils.java

/**
 * Play the audio of a {@link GeoCamTalkMessage} if available.
 *
 * @param context The activity context to send the intent from.
 * @param msg The {@link GeoCamTalkMessage} to play audio of.
 * @param player An instance of an {@link IAudioPlayer}
 * @param siteAuth The {@link ISiteAuth} to use to get attain audio from if not local
 * @throws ClientProtocolException the client protocol exception
 * @throws AuthenticationFailedException the authentication failed exception
 * @throws IOException Signals that an I/O exception has occurred.
 *///from   w  w w.j  a v a  2 s.c o m
public static void playAudio(Context context, GeoCamTalkMessage msg, IAudioPlayer player, ISiteAuth siteAuth)
        throws ClientProtocolException, AuthenticationFailedException, IOException {

    String audioUrl = msg.getAudioUrl();

    // No audio recorded with message
    if (msg.getAudio() == null && audioUrl == null) {
        return;
    }
    // We have audio, but not locally
    else if (msg.getAudio() == null && audioUrl != null) {
        String localFileName = siteAuth.getAudioFile(audioUrl, null);
        player.startPlaying(localFileName);
        File audioFile = new File(localFileName);
        int length = (int) audioFile.length();
        byte[] audioBytes = new byte[length];

        FileInputStream fis = new FileInputStream(audioFile);
        fis.read(audioBytes, 0, length);
        msg.setAudio(audioBytes);
    }
    player.startPlaying(msg.getAudio());
}

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From source file:Main.java

/**
 * Reads the given file, translating {@link IOException} to a
 * {@link RuntimeException} of some sort.
 *
 * @param file {@code non-null;} the file to read
 * @return {@code non-null;} contents of the file
 */// w w  w  . j av a 2 s  . c o  m
public static byte[] readFile(File file) {
    if (!file.exists()) {
        throw new RuntimeException(file + ": file not found");
    }

    if (!file.isFile()) {
        throw new RuntimeException(file + ": not a file");
    }

    if (!file.canRead()) {
        throw new RuntimeException(file + ": file not readable");
    }

    long longLength = file.length();
    int length = (int) longLength;
    if (length != longLength) {
        throw new RuntimeException(file + ": file too long");
    }

    byte[] result = new byte[length];

    try {
        FileInputStream in = new FileInputStream(file);
        int at = 0;
        while (length > 0) {
            int amt = in.read(result, at, length);
            if (amt == -1) {
                throw new RuntimeException(file + ": unexpected EOF");
            }
            at += amt;
            length -= amt;
        }
        in.close();
    } catch (IOException ex) {
        throw new RuntimeException(file + ": trouble reading", ex);
    }

    return result;
}

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From source file:Main.java

public static String getFileMD5(File file) {
    if (!file.isFile()) {
        return null;
    }//from w  w  w  .  j a  v  a 2 s.  co m
    MessageDigest digest = null;
    FileInputStream in = null;
    byte buffer[] = new byte[1024];
    int len;
    try {
        digest = MessageDigest.getInstance("MD5");
        in = new FileInputStream(file);
        while ((len = in.read(buffer, 0, 1024)) != -1) {
            digest.update(buffer, 0, len);
        }
        in.close();
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
    BigInteger bigInt = new BigInteger(1, digest.digest());
    return bigInt.toString(16);
}

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From source file:Main.java

public static String mergeFlockedFiles(String FilePath) {

    String result = null;/*from  w w w  . ja v  a  2  s .  c  om*/
    try {
        result = java.net.URLDecoder.decode(FilePath, "UTF-8");
    } catch (UnsupportedEncodingException e2) {
        // TODO Auto-generated catch block
        e2.printStackTrace();
    }
    String fileName = result.substring(result.lastIndexOf('/') + 1);
    if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) {

        File flockedFilesFolder = new File(
                Environment.getExternalStorageDirectory() + File.separator + "FlockLoad");
        System.out.println("FlockedFileDir: " + flockedFilesFolder);
        long leninfile = 0, leng = 0;
        int count = 1, data = 0;
        int bytesRead = 0;
        try {
            File filename = new File(flockedFilesFolder.toString() + "/" + fileName);
            if (filename.exists())
                filename.delete();
            //BUFFER_SIZE = (int) filename.length();
            System.out.println("filename: " + filename);
            FileOutputStream fos = new FileOutputStream(filename, true);

            while (true) {
                File filepart = new File(filename + ".part" + count);
                System.out.println("part filename: " + filepart);
                if (filepart.exists()) {
                    FileInputStream fis = new FileInputStream(filepart);
                    byte fileBytes[] = new byte[(int) filepart.length()];
                    bytesRead = fis.read(fileBytes, 0, (int) filepart.length());
                    assert (bytesRead == fileBytes.length);
                    assert (bytesRead == (int) filepart.length());
                    fos.write(fileBytes);
                    fos.flush();
                    fileBytes = null;
                    fis.close();
                    fis = null;
                    count++;
                    filepart.delete();
                } else
                    break;
            }
            fos.close();
            fos = null;
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return fileName;
}

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From source file:Utils.java

public static byte[] readAsByteArray(File file, long length) {
    try {/*w  w  w .ja  v a  2s  . co m*/
        byte[] bytes = new byte[(int) length];
        int offset = 0;
        int numRead = 0;
        FileInputStream is = new FileInputStream(file);
        while (offset < bytes.length && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
            offset += numRead;
        }
        is.close();
        return bytes;
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

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From source file:Main.java

private static byte[] readELFHeadrIndentArray(File libFile) {
    if (libFile != null && libFile.exists()) {
        FileInputStream inputStream = null;
        try {/*from  w  w w  . ja  v a2  s.co  m*/
            inputStream = new FileInputStream(libFile);
            if (inputStream != null) {
                byte[] tempBuffer = new byte[16];
                int count = inputStream.read(tempBuffer, 0, 16);
                if (count == 16) {
                    return tempBuffer;
                } else {
                    if (LOGENABLE) {
                        Log.e("readELFHeadrIndentArray",
                                "Error: e_indent lenght should be 16, but actual is " + count);
                    }
                }
            }
        } catch (Throwable t) {
            if (LOGENABLE) {
                Log.e("readELFHeadrIndentArray", "Error:" + t.toString());
            }
        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }

    return null;
}

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