public abstract class ContentHandler extends Object
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.plainIf the loading of the content handler class would be performed by a classloader that is outside of the delegation chain of the caller, the JVM will need the RuntimePermission "getClassLoader".
Constructor and Description |
---|
ContentHandler() |
Modifier and Type | Method and Description |
---|---|
abstract Object |
getContent(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 |
getContent(URLConnection urlc,
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.
|
public abstract Object getContent(URLConnection urlc) throws IOException
urlc
- a URL connection.ContentHandler
.IOException
- if an I/O error occurs while reading the object.public Object getContent(URLConnection urlc, Class[] classes) throws IOException
urlc
- a URL connection.classes
- an array of types requestedContentHandler
that is
the first match of the suggested types.
null if none of the requested are supported.IOException
- if an I/O error occurs while reading the object. Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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