URL

URL

URL(
    protocol: String!, 
    host: String!, 
    port: Int, 
    file: String!)

Creates a URL object from the specified protocol, host, port number, and file.

host can be expressed as a host name or a literal IP address. If IPv6 literal address is used, it should be enclosed in square brackets ('[' and ']'), as specified by RFC 2732; However, the literal IPv6 address format defined in RFC 2373: IP Version 6 Addressing Architecture is also accepted.

Specifying a port number of -1 indicates that the URL should use the default port for the protocol.

If this is the first URL object being created with the specified protocol, a stream protocol handler object, an instance of class URLStreamHandler, is created for that protocol:

1. If the application has previously set up an instance of URLStreamHandlerFactory as the stream handler factory, then the createURLStreamHandler method of that instance is called with the protocol string as an argument to create the stream protocol handler.
2. If no URLStreamHandlerFactory has yet been set up, or if the factory's createURLStreamHandler method returns null, then the constructor finds the value of the system property:

   java.protocol.handler.pkgs
         

   If the value of that system property is not null, it is interpreted as a list of packages separated by a vertical slash character '|'. The constructor tries to load the class named:

   <<i>package</i>>.<<i>protocol</i>>.Handler
         

   where <package> is replaced by the name of the package and <protocol> is replaced by the name of the protocol. If this class does not exist, or if the class exists but it is not a subclass of URLStreamHandler, then the next package in the list is tried.
3. If the previous step fails to find a protocol handler, then the constructor tries to load from a system default package.

   <<i>system default package</i>>.<<i>protocol</i>>.Handler
         

   If this class does not exist, or if the class exists but it is not a subclass of URLStreamHandler, then a MalformedURLException is thrown.

Protocol handlers for the following protocols are guaranteed to exist on the search path :-

http, https, file, and jar
  

No validation of the inputs is performed by this constructor.

URL

URL(
    protocol: String!, 
    host: String!, 
    file: String!)

Creates a URL from the specified protocol name, host name, and file name. The default port for the specified protocol is used.

This method is equivalent to calling the four-argument constructor with the arguments being protocol, host, -1, and file. No validation of the inputs is performed by this constructor.

URL

URL(
    protocol: String!, 
    host: String!, 
    port: Int, 
    file: String!, 
    handler: URLStreamHandler!)

Creates a URL object from the specified protocol, host, port number, file, and handler. Specifying a port number of -1 indicates that the URL should use the default port for the protocol. Specifying a handler of null indicates that the URL should use a default stream handler for the protocol, as outlined for: java.net.URL#URL(java.lang.String, java.lang.String, int, java.lang.String)

If the handler is not null and there is a security manager, the security manager's checkPermission method is called with a NetPermission("specifyStreamHandler") permission. This may result in a SecurityException. No validation of the inputs is performed by this constructor.

URL

URL(spec: String!)

Creates a URL object from the String representation.

This constructor is equivalent to a call to the two-argument constructor with a null first argument.

URL

URL(
    context: URL!, 
    spec: String!)

Creates a URL by parsing the given spec within a specified context. The new URL is created from the given context URL and the spec argument as described in RFC2396 "Uniform Resource Identifiers : Generic * Syntax" :

<scheme>://<authority><path>?<query>#<fragment>
  

If the scheme component is defined in the given spec and does not match the scheme of the context, then the new URL is created as an absolute URL based on the spec alone. Otherwise the scheme component is inherited from the context URL.

If the authority component is present in the spec then the spec is treated as absolute and the spec authority and path will replace the context authority and path. If the authority component is absent in the spec then the authority of the new URL will be inherited from the context.

If the spec's path component begins with a slash character "/" then the path is treated as absolute and the spec path replaces the context path.

Otherwise, the path is treated as a relative path and is appended to the context path, as described in RFC2396. Also, in this case, the path is canonicalized through the removal of directory changes made by occurrences of ".." and ".".

For a more detailed description of URL parsing, refer to RFC2396.

URL

URL(
    context: URL!, 
    spec: String!, 
    handler: URLStreamHandler!)

Creates a URL by parsing the given spec with the specified handler within a specified context. If the handler is null, the parsing occurs as with the two argument constructor.

equals

fun equals(other: Any?): Boolean

Compares this URL for equality with another object.

If the given object is not a URL then this method immediately returns false.

Two URL objects are equal if they have the same protocol, reference equivalent hosts, have the same port number on the host, and the same file and fragment of the file.

Returns true if this URL equals o. URLs are equal if they have the same protocol, host, port, file, and reference.

Network I/O Warning

Some implementations of URL.equals() resolve host names over the network. This is problematic:

• The network may be slow. Many classes, including core collections like Map and Set expect that equals and hashCode will return quickly. By violating this assumption, this method posed potential performance problems.
• Equal IP addresses do not imply equal content. Virtual hosting permits unrelated sites to share an IP address. This method could report two otherwise unrelated URLs to be equal because they're hosted on the same server.
• The network may not be available. Two URLs could be equal when a network is available and unequal otherwise.
• The network may change. The IP address for a given host name varies by network and over time. This is problematic for mobile devices. Two URLs could be equal on some networks and unequal on others.

This problem is fixed in Android 4.0 (Ice Cream Sandwich). In that release, URLs are only equal if their host names are equal (ignoring case).

getAuthority

fun getAuthority(): String!

Gets the authority part of this URL.

getContent

fun getContent(): Any!

Gets the contents of this URL. This method is a shorthand for:

openConnection().getContent()
  

getContent

fun getContent(classes: Array<Class<Any!>!>!): Any!

Gets the contents of this URL. This method is a shorthand for:

openConnection().getContent(Class[])
  

getDefaultPort

fun getDefaultPort(): Int

Gets the default port number of the protocol associated with this URL. If the URL scheme or the URLStreamHandler for the URL do not define a default port number, then -1 is returned.

getFile

fun getFile(): String!

Gets the file name of this URL. The returned file portion will be the same as getPath(), plus the concatenation of the value of getQuery(), if any. If there is no query portion, this method and getPath() will return identical results.

getHost

fun getHost(): String!

Gets the host name of this URL, if applicable. The format of the host conforms to RFC 2732, i.e. for a literal IPv6 address, this method will return the IPv6 address enclosed in square brackets ('[' and ']').

getPath

fun getPath(): String!

Gets the path part of this URL.

getPort

fun getPort(): Int

Gets the port number of this URL.

getProtocol

fun getProtocol(): String!

Gets the protocol name of this URL.

getQuery

fun getQuery(): String!

Gets the query part of this URL.

getRef

fun getRef(): String!

Gets the anchor (also known as the "reference") of this URL.

getUserInfo

fun getUserInfo(): String!

Gets the userInfo part of this URL.

hashCode

fun hashCode(): Int

Creates an integer suitable for hash table indexing.

The hash code is based upon all the URL components relevant for URL comparison. As such, this operation is a blocking operation.

openConnection

fun openConnection(): URLConnection!

Returns a URLConnection instance that represents a connection to the remote object referred to by the URL.

A new instance of URLConnection is created every time when invoking the URLStreamHandler.openConnection(URL) method of the protocol handler for this URL.

It should be noted that a URLConnection instance does not establish the actual network connection on creation. This will happen only when calling URLConnection.connect().

If for the URL's protocol (such as HTTP or JAR), there exists a public, specialized URLConnection subclass belonging to one of the following packages or one of their subpackages: java.lang, java.io, java.util, java.net, the connection returned will be of that subclass. For example, for HTTP an HttpURLConnection will be returned, and for JAR a JarURLConnection will be returned.

openConnection

fun openConnection(proxy: Proxy!): URLConnection!

Same as openConnection(), except that the connection will be made through the specified proxy; Protocol handlers that do not support proxing will ignore the proxy parameter and make a normal connection. Invoking this method preempts the system's default ProxySelector settings.

openStream

fun openStream(): InputStream!

Opens a connection to this URL and returns an InputStream for reading from that connection. This method is a shorthand for:

openConnection().getInputStream()
  

sameFile

fun sameFile(other: URL!): Boolean

Compares two URLs, excluding the fragment component.

Returns true if this URL and the other argument are equal without taking the fragment component into consideration.

setURLStreamHandlerFactory

static fun setURLStreamHandlerFactory(fac: URLStreamHandlerFactory!): Unit

Sets an application's URLStreamHandlerFactory. This method can be called at most once in a given Java Virtual Machine.

The URLStreamHandlerFactory instance is used to construct a stream protocol handler from a protocol name.

If there is a security manager, this method first calls the security manager's checkSetFactory method to ensure the operation is allowed. This could result in a SecurityException.

toExternalForm

fun toExternalForm(): String!

Constructs a string representation of this URL. The string is created by calling the toExternalForm method of the stream protocol handler for this object.

toString

fun toString(): String

Constructs a string representation of this URL. The string is created by calling the toExternalForm method of the stream protocol handler for this object.

toURI

fun toURI(): URI!

Returns a java.net.URI equivalent to this URL. This method functions in the same way as new URI (this.toString()).

Note, any URL instance that complies with RFC 2396 can be converted to a URI. However, some URLs that are not strictly in compliance can not be converted to a URI.