Java Utililty Methods Resource File

List of utility methods to do Resource File

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Description

The list of methods to do Resource File are organized into topic(s).

Method

voidgetEntriesFromResourceBundle(String rbName, Map map)
This method loads the resource bundle & puts all the values in map 
ResourceBundle rb = ResourceBundle.getBundle(rbName);
for (Enumeration e = rb.getKeys(); e.hasMoreElements();) {
    String key = (String) e.nextElement();
    map.put(key, rb.getString(key));
FilegetFile(Class clazz, String resource)
Get a file handle for the class's resource. 
File result = null;
if (clazz != null) {
    try {
        final URL url = clazz.getResource(resource);
        result = new File(url.toURI());
    } catch (URISyntaxException eat) {
if (result == null) {
    final String filename = getFilename(clazz, resource);
    result = filename == null ? null : getFile(filename);
return result;
FilegetFile(Class resourceClass, String fileName)
Returns a File named fileName associated with Class resourceClass . 
try {
    return new File(URLDecoder.decode(resourceClass.getResource(fileName).getFile(), "UTF-8"));
} catch (UnsupportedEncodingException e) {
    return new File(resourceClass.getResource(fileName).getFile());
FilegetFile(Class cls, String resource)
get File 
URL url = cls.getResource(resource);
if (url == null)
    return null;
return new File(url.getFile());
FilegetFile(String resource)
Multi protocol resource loader. 
File directFile = new File(resource);
if (directFile.exists()) {
    return directFile;
URL classLoader = Thread.currentThread().getContextClassLoader().getResource(resource);
if (classLoader == null) {
    throw new FileNotFoundException("Unable to locate '" + resource + "' as direct File or on classpath");
String fromURL = classLoader.getFile();
if (fromURL == null || fromURL.isEmpty()) {
    throw new FileNotFoundException("Unable to convert URL '" + fromURL + "' to File");
return new File(fromURL);
FilegetFile(String resourceOrFile, Class cls, boolean deleteTmpOnExit)
Use getInputStream instead, because Files are trouble, when in (maven) JARs 
try {
    URI uri = getURL(resourceOrFile, cls).toURI();
    String uriStr = uri.toString();
    if (uriStr.startsWith("jar")) {
        if (uriStr.endsWith("/")) {
            throw new UnsupportedOperationException("cannot unjar directories, only files");
        String jarPath = uriStr.substring(4, uriStr.indexOf("!")).replace("file:", "");
...
FilegetFileByResources(String fileName, Class clazz)
get File By Resources 
String strFile = clazz.getResource(fileName).getFile();
return new File(URLDecoder.decode(strFile, "utf-8"));
FilegetFileFromRelativeResource(final Class type, final String relativeResourceName)
Returns the specified file from a resource relative to the given type. 
final URL url = type.getResource(relativeResourceName);
final File file = getFileFrom(url);
return file;
FilegetFileFromSystemResources(String fileName)
get File From System Resources 
File file = null;
ClassLoader classLoader = ClassLoader.getSystemClassLoader();
if (classLoader != null) {
    URL url = classLoader.getResource(fileName);
    if (url == null) {
        url = classLoader.getResource(File.separator + fileName);
    try {
...
StringgetFilename(Class clazz, String resource)
Get the filename for the class's resource suitable for opening. 
String filename = null;
if (clazz == null) {
    filename = resource;
} else {
    final URL url = getUrl(clazz, resource);
    if (url != null) {
        filename = url.toString();
return filename;