Example usage for java.net URLConnection guessContentTypeFromStream

Introduction

In this page you can find the example usage for java.net URLConnection guessContentTypeFromStream.

Prototype

public static String guessContentTypeFromStream(InputStream is) throws IOException 

Source Link

Document

Tries to determine the type of an input stream based on the characters at the beginning of the input stream.

Usage

From source file:com.gargoylesoftware.htmlunit.WebClient.java

/**
 * Tries to guess the content type of the file.<br>
 * This utility could be located in an helper class but we can compare this functionality
 * for instance with the "Helper Applications" settings of Mozilla and therefore see it as a
 * property of the "browser"./*from www .  j  av a 2  s  . c o  m*/
 * @param file the file
 * @return "application/octet-stream" if nothing could be guessed
 */
public String guessContentType(final File file) {
    String contentType = URLConnection.guessContentTypeFromName(file.getName());
    if (file.getName().endsWith(".xhtml")) {
        // Java's mime type map doesn't know about XHTML files (at least in Sun JDK5).
        contentType = "application/xhtml+xml";
    }
    if (contentType == null) {
        InputStream inputStream = null;
        try {
            inputStream = new BufferedInputStream(new FileInputStream(file));
            contentType = URLConnection.guessContentTypeFromStream(inputStream);
        } catch (final IOException e) {
            // Ignore silently.
        } finally {
            IOUtils.closeQuietly(inputStream);
        }
    }
    if (contentType == null) {
        if (file.getName().endsWith(".js")) {
            contentType = "text/javascript";
        } else {
            contentType = "application/octet-stream";
        }
    }
    return contentType;
}

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From source file:edu.cmu.cylab.starslinger.view.HomeActivity.java

private long getOutStreamSizeAndData(Uri uri, String contentType) throws IOException {

    String name = null;/*from  w  ww . j a v a 2  s .co  m*/
    try {
        Cursor c = getContentResolver().query(uri, new String[] { MediaColumns.DISPLAY_NAME }, null, null,
                null);
        if (c != null) {
            try {
                if (c.moveToFirst()) {
                    name = c.getString(c.getColumnIndex(MediaColumns.DISPLAY_NAME));
                }
            } finally {
                c.close();
            }
        }
    } catch (IllegalArgumentException e) {
        // column may not exist
    }

    long size = -1;
    try {
        Cursor c = getContentResolver().query(uri, new String[] { MediaColumns.SIZE }, null, null, null);
        if (c != null) {
            try {
                if (c.moveToFirst()) {
                    size = c.getInt(c.getColumnIndex(MediaColumns.SIZE));
                }
            } finally {
                c.close();
            }
        }
    } catch (IllegalArgumentException e) {
        // column may not exist
    }

    String data = null;
    try {
        Cursor c = getContentResolver().query(uri, new String[] { MediaColumns.DATA }, null, null, null);
        if (c != null) {
            try {
                if (c.moveToFirst()) {
                    data = c.getString(c.getColumnIndex(MediaColumns.DATA));
                }
            } finally {
                c.close();
            }
        }
    } catch (IllegalArgumentException e) {
        // column may not exist
    }

    if (name == null) {
        name = uri.getLastPathSegment();
    }

    File f = null;
    if (size <= 0) {
        String uriString = uri.toString();
        if (uriString.startsWith("file://")) {
            MyLog.v(TAG, uriString.substring("file://".length()));
            f = new File(uriString.substring("file://".length()));
            size = f.length();
        } else {
            MyLog.v(TAG, "not a file: " + uriString);
        }
    }

    ContentResolver cr = getContentResolver();
    InputStream is;
    // read file bytes
    try {
        is = cr.openInputStream(uri);
    } catch (FileNotFoundException e) {
        if (!TextUtils.isEmpty(data)) {
            is = new FileInputStream(data);
        } else {
            return -1; // unable to load file at all
        }
    }

    if ((contentType != null) && (contentType.indexOf('*') != -1)) {
        contentType = getContentResolver().getType(uri);
    }

    if (contentType == null) {
        contentType = URLConnection.guessContentTypeFromStream(is);
        if (contentType == null) {
            String extension = SSUtil.getFileExtensionOnly(name);
            contentType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
            if (contentType == null) {
                contentType = SafeSlingerConfig.MIMETYPE_OPEN_ATTACH_DEF;
            }
        }
    }
    ByteArrayOutputStream baos = new ByteArrayOutputStream();

    byte[] buf = new byte[4096];
    while (is.read(buf) > -1) {
        baos.write(buf);
    }
    baos.flush();

    final byte[] fileBytes = baos.toByteArray();
    DraftData d = DraftData.INSTANCE;
    d.setFileData(fileBytes);
    d.setFileSize(fileBytes.length);
    d.setFileType(contentType);
    d.setFileName(name);
    if (f != null && f.exists()) {
        d.setFileDir(f.getAbsolutePath());
    } else if (!TextUtils.isEmpty(data)) {
        d.setFileDir(new File(data).getAbsolutePath());
    }
    return d.getFileSize();
}

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From source file:edu.cmu.cylab.starslinger.view.HomeActivity.java

private void doLoadAttachment(String path) throws FileNotFoundException {
    File phy = new File(path); // physical
    File vir = new File(path); // virtual, change if needed
    DraftData d = DraftData.INSTANCE;//from   w w  w  .  j a  va2  s .c  o  m

    try {
        FileInputStream is = new FileInputStream(phy.getAbsolutePath());
        try {
            byte[] outFileData = new byte[is.available()];
            is.read(outFileData);
            d.setFileData(outFileData);
            d.setFileSize(outFileData.length);

            if (d.getFileSize() > SafeSlingerConfig.MAX_FILEBYTES) {
                is.close();
                showNote(String.format(getString(R.string.error_CannotSendFilesOver),
                        SafeSlingerConfig.MAX_FILEBYTES));
                refreshView();
                return;
            }

            String type = URLConnection.guessContentTypeFromStream(is);
            if (type != null)
                d.setFileType(type);
            else {
                String extension = SSUtil.getFileExtensionOnly(vir.getName());
                type = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
                if (type != null) {
                    d.setFileType(type);
                } else {
                    d.setFileType(SafeSlingerConfig.MIMETYPE_OPEN_ATTACH_DEF);
                }
            }
        } finally {
            is.close();
        }
    } catch (OutOfMemoryError e) {
        showNote(R.string.error_OutOfMemoryError);
        refreshView();
        return;
    } catch (IOException e) {
        showNote(e);
        refreshView();
        return;
    }
    d.setFileName(vir.getName());
    d.setFileDir(phy.getPath());
    d.setMsgHash(null);
}

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