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[]) throws IOException

Source Link

Document

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

Usage

From source file:Main.java

public static String getFileMacEncrypt(File file, SecretKey key) throws IOException {
    String algorithm = key.getAlgorithm();
    Mac mac = null;//  ww  w.  j  a v a2s.  c o m
    try {
        mac = Mac.getInstance(algorithm);
        mac.init(key);
        FileInputStream in = new FileInputStream(file);
        byte[] buffer = new byte[1024 * 1024];
        int len = 0;
        while ((len = in.read(buffer)) > 0) {
            mac.update(buffer, 0, len);
        }
        in.close();
        return bytes2String(mac.doFinal());
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {
        e.printStackTrace();
    }
    return null;
}

From source file:Main.java

public static String readTextFromSDcard(String fileName) {

    File file = new File(fileName);
    if (!file.exists()) {
        return null;
    }//from   w  ww  .  j ava 2  s.  c o  m
    try {
        FileInputStream fileInputStream = new FileInputStream(file);
        int availableLength = fileInputStream.available();
        byte[] buffer = new byte[availableLength];
        fileInputStream.read(buffer);
        fileInputStream.close();

        return new String(buffer, "UTF-8");

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

From source file:com.domnian.BotConfiguration.java

public static void load(File file) throws Exception {
    if (file.createNewFile()) {
        BotConfiguration.writeDefault(file);
    }//  w ww .  jav a 2s.c om
    FileInputStream fis = new FileInputStream(file);
    byte[] buffer = new byte[1024];
    fis.read(buffer);
    JSONObject configJson = new JSONObject(new String(buffer));
    connectJson = configJson.getJSONObject("connect");
    identJson = configJson.getJSONObject("ident");
    nickServJson = configJson.getJSONObject("auth");
    manage = configJson.getString("manage");
}

From source file:Main.java

public static byte[] getBytesFromFile(File f) {
    if (f == null) {
        return null;
    }//from   w w w  . j a v  a 2s .  c o m
    try {
        FileInputStream stream = new FileInputStream(f);
        ByteArrayOutputStream out = new ByteArrayOutputStream(1000);
        byte[] b = new byte[1000];
        for (int n; (n = stream.read(b)) != -1;) {
            out.write(b, 0, n);
        }
        stream.close();
        out.close();
        return out.toByteArray();
    } catch (IOException e) {
    }
    return null;
}

From source file:Main.java

public static byte[] readFileToByteArray2(File file) {
    try {//from   w  ww. ja  v  a 2s  .  com
        FileInputStream fis = new FileInputStream(file);
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        byte[] buf = new byte[1024];

        for (int readNum; (readNum = fis.read(buf)) != -1;) {
            bos.write(buf, 0, readNum);
        }
        bos.flush();
        byte[] bytes = bos.toByteArray();
        fis.close();
        bos.close();
        return bytes;

    } catch (IOException e) {
        return null;
    }
}

From source file:Main.java

public static void copyFile(File fromFile, File toFile) throws IOException {
    FileInputStream inputStream = new FileInputStream(fromFile);
    FileOutputStream outputStream = new FileOutputStream(toFile);
    byte[] buffer = new byte[4096];
    for (int numRead; (numRead = inputStream.read(buffer)) != -1;)
        outputStream.write(buffer, 0, numRead);
    inputStream.close();/*  ww  w . ja  v a2s.  c  om*/
    outputStream.close();
}

From source file:Main.java

static private void addFileToZip(String path, String srcFile, ZipOutputStream zip) throws IOException {

    File folder = new File(srcFile);
    if (folder.isDirectory()) {
        addFolderToZip(path, srcFile, zip, false);
    } else {/*from w  w  w. j  a  v  a 2 s  .c o m*/
        byte[] buf = new byte[1024];
        int len;
        FileInputStream in = new FileInputStream(srcFile);
        try {
            zip.putNextEntry(new ZipEntry(path + "/" + folder.getName()));
            while ((len = in.read(buf)) > 0) {
                zip.write(buf, 0, len);
            }
        } finally {
            in.close();
        }
    }
}

From source file:Main.java

public static byte[] File2byte(String filePath) {
    byte[] buffer = null;
    try {/*from  w  w w .  j a v  a2 s .  c  om*/
        File file = new File(filePath);
        FileInputStream fis = new FileInputStream(file);
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        byte[] b = new byte[1024];
        int n;
        while ((n = fis.read(b)) != -1) {
            bos.write(b, 0, n);
        }
        fis.close();
        bos.close();
        buffer = bos.toByteArray();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return buffer;
}

From source file:Main.java

public static void zipMutiCompress(File[] srcfile, File destFile) {
    byte[] buf = new byte[BUFFERED_SIZE];
    try {/*from   w  ww  .  ja va 2 s  .  c  om*/
        ZipOutputStream out = new ZipOutputStream(new FileOutputStream(destFile));
        if (null != srcfile && srcfile.length > 0) {
            for (int i = 0; i < srcfile.length; i++) {
                File file = srcfile[i];
                if (null != file) {
                    FileInputStream in = new FileInputStream(file);
                    out.putNextEntry(new ZipEntry(file.getName()));
                    int len;
                    while ((len = in.read(buf)) > 0) {
                        out.write(buf, 0, len);
                    }
                    out.closeEntry();
                    in.close();
                }
            }
        }
        out.close();
    } catch (IOException e) {

    }
}

From source file:Main.java

/**
 * Copies source file to destination.//from  www. j  a  va2s.  c om
 * If destination file exists it will be overwritten silently.
 *
 * @param source file
 * @param target file
 */
public static void copyFile(final File source, final File target) {
    try {
        FileInputStream in = new FileInputStream(source);
        FileOutputStream out = new FileOutputStream(target);
        byte[] buf = new byte[4096];
        int len;
        while ((len = in.read(buf)) > 0) {
            out.write(buf, 0, len);
        }
        out.close();
        in.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}