Java Utililty Methods Content Type Get

String contentType = URLConnection.guessContentTypeFromName(file.getName());
if (contentType == null || !contentType.startsWith("image/")) {
    throw new IllegalArgumentException(file.getCanonicalPath() + " is not a supported image file.");
return contentType;

String contentType = (URLConnection.guessContentTypeFromName(file.getName()));
if ("".equals(contentType) || contentType == null) {
    if (file.getName().contains(".jhtml")) {
        contentType = "text/jhtml";
    if (file.getName().contains(".jap")) {
        contentType = "application/jap";
    if (file.getName().contains(".css")) {
        contentType = "text/css";
    if (file.getName().contains(".js")) {
        contentType = "text/javascript";
return contentType;

return getContentType(file.getName());

FileNameMap mapNew = URLConnection.getFileNameMap();
String temp = mapNew.getContentTypeFor("." + getExtension(filename));
return (temp == null) ? "application/octet-stream" : temp;

return "multipart/form-data; boundary=" + boundary;

String foundContentType = null;
file = file.trim();
if (fileNameMap != null)
    foundContentType = fileNameMap.getContentTypeFor(file);
if (foundContentType != null)
    return foundContentType;
else
    return "application/octet-stream";
...

return URLConnection.guessContentTypeFromName(fileName);

return filename.endsWith(".html") ? "text/html"
        : filename.endsWith(".css") ? "text/css"
                : filename.endsWith(".js") ? "text/javascript"
                        : URLConnection.guessContentTypeFromName(filename);

String contentType;
FileNameMap fileNameMap = URLConnection.getFileNameMap();
contentType = fileNameMap.getContentTypeFor(name);
if (contentType == null) {
    int index = name.lastIndexOf(".");
    if (index > -1) {
        contentType = localFileNameMap.getProperty(name.substring(index));
return contentType;