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

/**
 * Converts a file specified by the path, to the String.
 *//*from  w  w w .  j a  va  2s .c om*/
public static String fileToString(String fileName) {
    if (fileName != null) {
        //String sLine;
        byte[] utf8Bytes;
        String sFile = new String();
        // Reading input by lines:
        try {
            FileInputStream fis = new FileInputStream(fileName);
            int noOfBytes = fis.available();
            if (noOfBytes > 0) {
                utf8Bytes = new byte[noOfBytes];
                fis.read(utf8Bytes);
                sFile = new String(utf8Bytes, "UTF8");
            }
        } catch (Exception ex) {
            return null;
        }
        return sFile;
    }
    return null;
}

From source file:core.SHA256Hash.java

public static String CalculateCheckSum(String FileName, String url) throws Exception {
    MessageDigest md = MessageDigest.getInstance(getHashAlgType(url));
    FileInputStream fis = new FileInputStream(FileName);

    byte[] dataBytes = new byte[1024];

    int nread = 0;
    while ((nread = fis.read(dataBytes)) != -1) {
        md.update(dataBytes, 0, nread);//  www . jav a  2 s  .  co m
    }
    ;
    byte[] mdbytes = md.digest();

    // Store byte array as string and return it
    String value = new String(mdbytes);
    System.out.println("Encoded " + getHashAlgType(url) + " hash: " + value);

    return value;
}

From source file:Main.java

/**
 * Reads content of the file into string buffer
 * @param tempFile instance of java.io.File that points to an actual file on the file system.
 * @return instance of java.lang.StringBuffer
 *///from w w  w.  j  a  v a 2 s  . co  m
public static StringBuffer readFromFile(File tempFile) {
    StringBuffer stringBuffer = new StringBuffer();
    FileInputStream is = null;

    try {
        is = new FileInputStream(tempFile);

        byte[] buffer = new byte[1024];
        int count = 0;

        while ((count = is.read(buffer)) != -1) {
            stringBuffer.append(new String(buffer, 0, count));
        }

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (is != null) {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    return stringBuffer;
}

From source file:eu.stratosphere.nephele.jobmanager.web.LogfileInfoServlet.java

private static void writeFile(OutputStream out, File file) throws IOException {
    byte[] buf = new byte[4 * 1024]; // 4K buffer

    FileInputStream is = null;
    try {/*from   w w  w  .j  a  v  a  2s.  c  om*/
        is = new FileInputStream(file);

        int bytesRead;
        while ((bytesRead = is.read(buf)) != -1) {
            out.write(buf, 0, bytesRead);
        }
    } finally {
        if (is != null) {
            is.close();
        }
    }
}

From source file:com.recomdata.transmart.data.export.util.ZipUtil.java

/**
 * This method will bundle all the files into a zip file. 
 * If there are 2 files with the same name, only the first file is part of the zip.
 * /*from  w w w  .java2 s  .  c  om*/
 * @param zipFileName
 * @param files
 * 
 * @return zipFile absolute path
 * 
 */
public static String bundleZipFile(String zipFileName, List<File> files) {
    File zipFile = null;
    Map<String, File> filesMap = new HashMap<String, File>();

    if (StringUtils.isEmpty(zipFileName))
        return null;

    try {
        zipFile = new File(zipFileName);
        if (zipFile.exists() && zipFile.isFile() && zipFile.delete()) {
            zipFile = new File(zipFileName);
        }

        ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(zipFile));
        zipOut.setLevel(ZipOutputStream.DEFLATED);
        byte[] buffer = new byte[BUFFER_SIZE];

        for (File file : files) {
            if (filesMap.containsKey(file.getName())) {
                continue;
            } else if (file.exists() && file.canRead()) {
                filesMap.put(file.getName(), file);
                zipOut.putNextEntry(new ZipEntry(file.getName()));
                FileInputStream fis = new FileInputStream(file);
                int bytesRead;
                while ((bytesRead = fis.read(buffer)) != -1) {
                    zipOut.write(buffer, 0, bytesRead);
                }
                zipOut.flush();
                zipOut.closeEntry();
            }
        }
        zipOut.finish();
        zipOut.close();
    } catch (IOException e) {
        //log.error("Error while creating Zip file");
    }

    return (null != zipFile) ? zipFile.getAbsolutePath() : null;
}

From source file:cz.cas.lib.proarc.common.imports.InputUtils.java

/**
 * Checks a file for magic numbers.//www.  j av a2  s  .  c  om
 * @param f file to check
 * @param magics list of magic numbers
 * @return {@code true} if the file starts with some of magic numbers.
 * @throws IOException file access failure
 */
public static boolean hasMagicNumber(File f, byte[]... magics) throws IOException {
    int maxlength = 0;
    int minlength = 0;
    for (byte[] magic : magics) {
        maxlength = Math.max(maxlength, magic.length);
        minlength = Math.min(minlength, magic.length);
    }
    FileInputStream fis = new FileInputStream(f);
    try {
        byte[] buf = new byte[maxlength];
        int length = fis.read(buf);
        if (length < minlength) {
            return false;
        }
        for (byte[] magic : magics) {
            if (startWith(buf, length, magic)) {
                return true;
            }
        }
        return false;
    } finally {
        IOUtils.closeQuietly(fis);
    }
}

From source file:Main.java

public static byte[] fileToByte(String filePath) throws Exception {
    byte[] data = new byte[0];
    File file = new File(filePath);
    if (file.exists()) {
        FileInputStream in = new FileInputStream(file);
        ByteArrayOutputStream out = new ByteArrayOutputStream(2048);
        byte[] cache = new byte[CACHE_SIZE];
        int nRead = 0;
        while ((nRead = in.read(cache)) != -1) {
            out.write(cache, 0, nRead);//from  w  ww  . j  a  va2  s.  c o m
            out.flush();
        }
        out.close();
        in.close();
        data = out.toByteArray();
    }
    return data;
}

From source file:com.recomdata.transmart.data.export.util.ZipUtil.java

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

    File folder = new File(srcFile);
    if (folder.isDirectory()) {
        addFolderToZip(path, srcFile, zip);
    } else {/*from  w  w  w  . j av  a  2  s.com*/
        byte[] buf = new byte[BUFFER_SIZE];
        int len;
        FileInputStream in = new FileInputStream(srcFile);
        zip.putNextEntry(new ZipEntry(path + "/" + folder.getName()));
        while ((len = in.read(buf)) > 0) {
            zip.write(buf, 0, len);
        }
    }
}

From source file:Main.java

public static void CopyFile(String source, String destination) throws IOException {
    FileInputStream fin = new FileInputStream(source);
    FileOutputStream fout = new FileOutputStream(destination);

    byte[] b = new byte[1024 * 1024];
    int noOfBytes = 0;

    while ((noOfBytes = fin.read(b)) != -1) {
        fout.write(b, 0, noOfBytes);//from w  w w  .  ja  v  a 2s .  c  om
    }

    fin.close();
    fout.close();
}

From source file:Main.java

private static void movefile(String srcPath, String dstPath) throws IOException {
    File srcFile = new File(srcPath);
    File dstFile = new File(dstPath);

    if (srcFile.exists()) {
        FileInputStream inputStream = new FileInputStream(srcFile);
        FileOutputStream outputStream = new FileOutputStream(dstFile);
        byte[] bytes = new byte[1024];
        int reads = 0;
        while ((reads = inputStream.read(bytes)) != -1) {
            outputStream.write(bytes, 0, reads);
        }//from  w  w  w.j  a va  2s.  com
        srcFile.delete();
    }

}