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:web.diva.server.model.JFreeImgGenerator.java

public synchronized String saveToFile(JFreeChart chart, double width, double height, String path,
        ChartRenderingInfo chartRenderingInfo, String imgName) {
    try {/* w  w  w  .ja v a2 s.  c om*/
        File f = new File(path, imgName + ".png");
        if (!f.exists()) {
            f.createNewFile();
        }
        try {
            ChartUtilities.saveChartAsPNG(f, chart, (int) width, (int) height, chartRenderingInfo);
        } catch (IOException e) {
            System.err.println(e.getMessage());
        }
        FileInputStream imageInFile = new FileInputStream(f);
        byte imageData[] = new byte[(int) f.length()];
        imageInFile.read(imageData);
        String base64 = Base64.encodeBase64String(imageData);
        base64 = "data:image/png;base64," + base64;
        f.delete();
        return base64;
    } catch (IOException e) {
        System.err.println(e.getMessage());
    }
    return "";

}

From source file:cn.org.citycloud.srdz.utils.FileUtils.java

/**
 * ZIP?//from  w  ww.  j  a v  a 2s.co  m
 * @param dirPath 
 * @param file 
 * @param zouts ?
 */
public static void zipFilesToZipFile(String dirPath, File file, ZipOutputStream zouts) {
    FileInputStream fin = null;
    ZipEntry entry = null;
    // ?
    byte[] buf = new byte[4096];
    int readByte = 0;
    if (file.isFile()) {
        try {
            // ?
            fin = new FileInputStream(file);
            // ZipEntry
            entry = new ZipEntry(getEntryName(dirPath, file));
            // ?
            zouts.putNextEntry(entry);
            // ?
            while ((readByte = fin.read(buf)) != -1) {
                zouts.write(buf, 0, readByte);
            }
            zouts.closeEntry();
            fin.close();
            System.out.println(" " + file.getAbsolutePath() + " zip!");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

From source file:css.controller.AdmissionResultsController.java

private void downloadFile(String file, HttpServletResponse httpServletResponse) throws Exception {
    OutputStream out = httpServletResponse.getOutputStream();
    FileInputStream in = new FileInputStream(file);
    byte[] buffer = new byte[4096];
    int length;//from w ww .  ja  va2s .c o  m
    while ((length = in.read(buffer)) > 0) {
        out.write(buffer, 0, length);
    }
    in.close();
    out.flush();
}

From source file:edu.internet2.middleware.shibboleth.common.config.security.FilesystemBasicCredentialBeanDefinitionParser.java

/** {@inheritDoc} */
protected byte[] getEncodedPrivateKey(String keyConfigContent) {
    try {/*from   www  . j  a va2  s .co m*/
        FileInputStream ins = new FileInputStream(keyConfigContent);
        byte[] encoded = new byte[ins.available()];
        ins.read(encoded);
        return encoded;
    } catch (IOException e) {
        throw new FatalBeanException("Unable to read private key from file " + keyConfigContent, e);
    }
}

From source file:edu.internet2.middleware.shibboleth.common.config.security.FilesystemBasicCredentialBeanDefinitionParser.java

/** {@inheritDoc} */
protected byte[] getEncodedSecretKey(String keyConfigContent) {
    try {/*from   ww w .  jav a  2 s  .com*/
        FileInputStream ins = new FileInputStream(keyConfigContent);
        byte[] encoded = new byte[ins.available()];
        ins.read(encoded);
        return encoded;
    } catch (IOException e) {
        throw new FatalBeanException("Unable to read secret key from file " + keyConfigContent, e);
    }
}

From source file:edu.internet2.middleware.shibboleth.common.config.security.FilesystemBasicCredentialBeanDefinitionParser.java

/** {@inheritDoc} */
protected byte[] getEncodedPublicKey(String keyConfigContent) {
    try {// ww w.ja  v  a  2 s.  c o  m
        FileInputStream ins = new FileInputStream(keyConfigContent);
        byte[] encoded = new byte[ins.available()];
        ins.read(encoded);
        return encoded;
    } catch (IOException e) {
        throw new FatalBeanException("Unable to read public key from file " + keyConfigContent, e);
    }
}

From source file:net.opentsdb.tsd.GraphHandler.java

/**
 * Reads a file into a byte array./*w  w w  . j  a  v  a 2 s  .  c  o  m*/
 * @param query The query being handled (for logging purposes).
 * @param file The file to read.
 * @param max_length The maximum number of bytes to read from the file.
 * @return {@code null} if the file doesn't exist or is empty or couldn't be
 * read, otherwise a byte array of up to {@code max_length} bytes.
 */
private static byte[] readFile(final HttpQuery query, final File file, final int max_length) {
    final int length = (int) file.length();
    if (length <= 0) {
        return null;
    }
    FileInputStream in;
    try {
        in = new FileInputStream(file.getPath());
    } catch (FileNotFoundException e) {
        return null;
    }
    try {
        final byte[] buf = new byte[Math.min(length, max_length)];
        final int read = in.read(buf);
        if (read != buf.length) {
            logError(query, "When reading " + file + ": read only " + read + " bytes instead of " + buf.length);
            return null;
        }
        return buf;
    } catch (IOException e) {
        logError(query, "Error while reading " + file, e);
        return null;
    } finally {
        try {
            in.close();
        } catch (IOException e) {
            logError(query, "Error while closing " + file, e);
        }
    }
}