Java Utililty Methods URL Connection

List of utility methods to do URL Connection

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Description

The list of methods to do URL Connection are organized into topic(s).

Method

booleanisValidUrl(String input)
is Valid Url 
if (!input.startsWith("http://") && !input.startsWith("https://")) {
    input = ("http://" + input);
try {
    URI uri = new URI(input);
    URL url = uri.toURL();
    java.net.URLConnection conn = url.openConnection();
    conn.connect();
...
booleanisZipName(URI documentIRI, URLConnection connection)
is Zip Name 
if (isZipFileName(documentIRI.toString())) {
    return true;
} else {
    String fileName = getFileNameFromContentDisposition(connection);
    return fileName != null && isZipFileName(fileName);
ListjarURLDirectories(URL jarURL)
Return the directories in a jar URI, relative to the jar entry, if any. 
List directories = new LinkedList();
JarURLConnection connection = (JarURLConnection) (jarURL.openConnection());
String jarEntryName = connection.getEntryName();
if (jarEntryName.endsWith("/")) {
    jarEntryName = jarEntryName.substring(0, jarEntryName.length() - 1);
JarFile jarFile = connection.getJarFile();
Enumeration entries = jarFile.entries();
...
URLjarURLEntryResource(String jarURLString)
Lookup a jar URL and return the resource. 
int jarEntry = jarURLString.indexOf("!/");
if (jarEntry == -1) {
    jarEntry = jarURLString.indexOf("!\\");
    if (jarEntry == -1) {
        return null;
try {
...
longlastModifiedURL(String urlstr)
last Modified URL 
long result = 0L;
if (urlstr != null) {
    try {
        URL url = new URL(urlstr);
        URLConnection conn = url.openConnection();
        result = conn.getLastModified();
    } catch (IOException ex) {
        ex.printStackTrace();
...
StringloadCookie(URL url)
load Cookie 
URLConnection conn = url.openConnection();
conn.connect();
Map<String, List<String>> headers = conn.getHeaderFields();
List<String> values = headers.get("Set-Cookie");
if (values.size() > 0) {
    return values.get(0);
return "";
...
ListloadJar(String path, URL resource)
load Jar 
JarURLConnection conn = (JarURLConnection) resource.openConnection();
JarFile jarFile = conn.getJarFile();
Enumeration<JarEntry> entries = jarFile.entries();
List<URL> result = new LinkedList<URL>();
String p = path;
if (p.endsWith("/") == false) {
    p = p + "/";
while (entries.hasMoreElements()) {
    JarEntry entry = entries.nextElement();
    if ((!entry.getName().equals(p))
            && (entry.getName().startsWith(p) || entry.getName().startsWith("WEB-INF/classes/" + p))) {
        URL url = new URL("jar:" + new URL("file", null, jarFile.getName() + "!/" + entry.getName()));
        result.add(url);
return result;
ListloadLinesUrl(String url)
Load the lines from a remote URL into a list of strings. 
try {
    URL resource = new URL(url);
    String filename = resource.getFile().replaceAll("/", "_");
    URLConnection conn = resource.openConnection();
    File file = new File(filename);
    if (!file.exists() || file.lastModified() < conn.getLastModified()) {
        byte buffer[] = new byte[4096];
        int n;
...
ObjectloadObjectFromURL(URL url)
return a object read from the URL 
try {
    URLConnection uc = url.openConnection();
    ObjectInputStream tis = new ObjectInputStream((InputStream) uc.getContent());
    Object obj = tis.readObject();
    tis.close();
    return obj;
} catch (Exception e) {
    e.printStackTrace();
...
URLmap2URL(final Properties properties)
map URL 
URLStreamHandler handler = new URLStreamHandler() {
    @Override
    protected URLConnection openConnection(URL u) throws IOException {
        return new URLConnection(u) {
            @Override
            public void connect() throws IOException {
            @Override
...