java.net
Class ContentHandler

java.lang.Object sample code for java.lang.Object definition code for java.lang.Object 
  extended by java.net.ContentHandler

public abstract class ContentHandler
extends Object sample code for java.lang.Object definition code for java.lang.Object

The abstract class ContentHandler is the superclass of all classes that read an Object from a URLConnection.

An application does not generally call the getContent method in this class directly. Instead, an application calls the getContent method in class URL or in URLConnection. The application's content handler factory (an instance of a class that implements the interface ContentHandlerFactory set up by a call to setContentHandler) is called with a String giving the MIME type of the object being received on the socket. The factory returns an instance of a subclass of ContentHandler, and its getContent method is called to create the object.

If no content handler could be found, URLConnection will look for a content handler in a user-defineable set of places. By default it looks in sun.net.www.content, but users can define a vertical-bar delimited set of class prefixes to search through in addition by defining the java.content.handler.pkgs property. The class name must be of the form:

     {package-prefix}.{major}.{minor}
 e.g.
     YoyoDyne.experimental.text.plain
 
If the loading of the content handler class would be performed by a classloader that is outside of the the delegation chain of the caller, the JVM will need the RuntimePermission "getClassLoader".

Since:
JDK1.0
See Also:
getContent(java.net.URLConnection) sample code for java.net.ContentHandler.getContent(java.net.URLConnection) definition code for java.net.ContentHandler.getContent(java.net.URLConnection) , ContentHandlerFactory sample code for java.net.ContentHandlerFactory definition code for java.net.ContentHandlerFactory , URL.getContent() sample code for java.net.URL.getContent() definition code for java.net.URL.getContent() , URLConnection sample code for java.net.URLConnection definition code for java.net.URLConnection , URLConnection.getContent() sample code for java.net.URLConnection.getContent() definition code for java.net.URLConnection.getContent() , URLConnection.setContentHandlerFactory(java.net.ContentHandlerFactory) sample code for java.net.URLConnection.setContentHandlerFactory(java.net.ContentHandlerFactory) definition code for java.net.URLConnection.setContentHandlerFactory(java.net.ContentHandlerFactory)

Constructor Summary
ContentHandler sample code for java.net.ContentHandler.ContentHandler() definition code for java.net.ContentHandler.ContentHandler() ()
           
 
Method Summary
abstract  Object sample code for java.lang.Object definition code for java.lang.Object getContent sample code for java.net.ContentHandler.getContent(java.net.URLConnection) definition code for java.net.ContentHandler.getContent(java.net.URLConnection) (URLConnection sample code for java.net.URLConnection definition code for java.net.URLConnection  urlc)
          Given a URL connect stream positioned at the beginning of the representation of an object, this method reads that stream and creates an object from it.
 Object sample code for java.lang.Object definition code for java.lang.Object getContent sample code for java.net.ContentHandler.getContent(java.net.URLConnection, java.lang.Class[]) definition code for java.net.ContentHandler.getContent(java.net.URLConnection, java.lang.Class[]) (URLConnection sample code for java.net.URLConnection definition code for java.net.URLConnection  urlc, Class sample code for java.lang.Class definition code for java.lang.Class [] classes)
          Given a URL connect stream positioned at the beginning of the representation of an object, this method reads that stream and creates an object that matches one of the types specified.
 
Methods inherited from class java.lang.Object sample code for java.lang.Object definition code for java.lang.Object
clone sample code for java.lang.Object.clone() definition code for java.lang.Object.clone() , equals sample code for java.lang.Object.equals(java.lang.Object) definition code for java.lang.Object.equals(java.lang.Object) , finalize sample code for java.lang.Object.finalize() definition code for java.lang.Object.finalize() , getClass sample code for java.lang.Object.getClass() definition code for java.lang.Object.getClass() , hashCode sample code for java.lang.Object.hashCode() definition code for java.lang.Object.hashCode() , notify sample code for java.lang.Object.notify() definition code for java.lang.Object.notify() , notifyAll sample code for java.lang.Object.notifyAll() definition code for java.lang.Object.notifyAll() , toString sample code for java.lang.Object.toString() definition code for java.lang.Object.toString() , wait sample code for java.lang.Object.wait() definition code for java.lang.Object.wait() , wait sample code for java.lang.Object.wait(long) definition code for java.lang.Object.wait(long) , wait sample code for java.lang.Object.wait(long, int) definition code for java.lang.Object.wait(long, int)
 

Constructor Detail

ContentHandler sample code for java.net.ContentHandler() definition code for java.net.ContentHandler()

public ContentHandler()
Method Detail

getContent sample code for java.net.ContentHandler.getContent(java.net.URLConnection) definition code for java.net.ContentHandler.getContent(java.net.URLConnection)

public abstract Object sample code for java.lang.Object definition code for java.lang.Object  getContent(URLConnection sample code for java.net.URLConnection definition code for java.net.URLConnection  urlc)
                           throws IOException sample code for java.io.IOException definition code for java.io.IOException 
Given a URL connect stream positioned at the beginning of the representation of an object, this method reads that stream and creates an object from it.

Parameters:
urlc - a URL connection.
Returns:
the object read by the ContentHandler.
Throws:
IOException sample code for java.io.IOException definition code for java.io.IOException - if an I/O error occurs while reading the object.

getContent sample code for java.net.ContentHandler.getContent(java.net.URLConnection, java.lang.Class[]) definition code for java.net.ContentHandler.getContent(java.net.URLConnection, java.lang.Class[])

public Object sample code for java.lang.Object definition code for java.lang.Object  getContent(URLConnection sample code for java.net.URLConnection definition code for java.net.URLConnection  urlc,
                         Class sample code for java.lang.Class definition code for java.lang.Class [] classes)
                  throws IOException sample code for java.io.IOException definition code for java.io.IOException 
Given a URL connect stream positioned at the beginning of the representation of an object, this method reads that stream and creates an object that matches one of the types specified. The default implementation of this method should call getContent() and screen the return type for a match of the suggested types.

Parameters:
urlc - a URL connection.
classes - an array of types requested
Returns:
the object read by the ContentHandler that is the first match of the suggested types. null if none of the requested are supported.
Throws:
IOException sample code for java.io.IOException definition code for java.io.IOException - if an I/O error occurs while reading the object.