Java Utililty Methods Class Path

List of utility methods to do Class Path

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Description

The list of methods to do Class Path are organized into topic(s).

Method

StringgetClassFilePath(final Class cls)
Get the path of the class file for a given class. 
int end = 0;
String urlStr = null;
String clsName = cls.getName();
final int clsNameLen = clsName.length() + CLASS_EXT.length();
int pos = clsName.lastIndexOf(CLASS_SEPARATOR);
if (pos > -1) {
    clsName = clsName.substring(pos + 1);
clsName = clsName + CLASS_EXT;
final URL url = cls.getResource(clsName);
if (url != null) {
    urlStr = url.toString();
    pos = urlStr.indexOf(JAR_SEPARATOR);
    if (pos > -1) {
        urlStr = urlStr.substring(0, pos);
        end = urlStr.lastIndexOf(URL_SEPARATOR) + 1;
    } else {
        end = urlStr.length() - clsNameLen;
    pos = urlStr.lastIndexOf(FILE_PREFIX);
    if (pos > -1) {
        pos += FILE_PREFIX.length() + 1;
    } else {
        pos = 0;
    urlStr = urlStr.substring(pos, end);
    urlStr = urlStr.replaceAll("%20", " ");
return urlStr;
StringgetClassFilePath(String package_name, String class_name)
get Class File Path 
String path = null;
try {
    Class c = Class.forName(package_name + "." + class_name);
    path = getClassFilePath(c);
} catch (ClassNotFoundException e) {
    System.err.println("Could not locate class " + package_name + "." + class_name);
    path = null;
return path;
ListgetClassNameByFile(String filePath, List className, boolean childPackage)
get Class Name By File 
List<String> myClassName = new ArrayList<String>();
filePath = URLDecoder.decode(filePath, "utf-8");
File file = new File(filePath);
File[] childFiles = file.listFiles();
for (File childFile : childFiles) {
    if (childFile.isDirectory()) {
        if (childPackage) {
            myClassName.addAll(getClassNameByFile(childFile.getPath(), myClassName, childPackage));
...
StringgetDirectoryPath(Class owner)
Get directory path according to Class. 
String packageName = owner.getPackage().getName().replace(".", String.valueOf(File.separator));
URL resource = owner.getClassLoader().getResource(packageName);
if (resource != null) {
    return resource.getPath();
return null;
FilegetFile(Class base, String path)
get File 
return urlToFile(base.getResource(path));
StringgetFullPathOfClass(Class cls)
get Full Path Of Class 
URL url = cls.getProtectionDomain().getCodeSource().getLocation();
String path = url.getPath();
String[] dirs = cls.getName().split("\\.");
for (int i = 0; i < dirs.length - 1; i++)
    path += dirs[i] + "/";
return path;
StringgetFullpathRessources(Class c, String ressource)
get Fullpath Ressources 
URL url = c.getResource(ressource);
if (url == null) {
    return null;
try {
    Class<?> fl = Class.forName("org.eclipse.core.runtime.FileLocator");
    url = (URL) fl.getMethod("toFileURL", URL.class).invoke(null, url);
} catch (Exception e) {
...
InputStreamgetInputStream(Class cls, String path)
This method attempts to create an input stream from the given path by:
  1. Trying to parse it as a URL
  2. Trying to find it on the classpath, relative to the given class
  3. Trying to find it as a file on the file system
InputStream inputStream;
try {
    inputStream = new URL(path).openStream();
} catch (MalformedURLException e) {
    inputStream = cls.getResourceAsStream(path);
    if (inputStream == null) {
        try {
            inputStream = new FileInputStream(path);
...
StringgetPath(Class tClass)
get Path 
String rtn = null;
URL url = getURL(tClass);
if (url != null) {
    rtn = url.getPath();
    rtn = rtn.replace(tClass.getSimpleName() + ".class", "");
return rtn;
StringgetPath(final String aPath, final Class aClass)
get Path 
final URL url = getClasspathUrl(aClass, aPath);
return url != null ? url.toString() : aPath;