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jdk.net.ContentHandler

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 delegation chain of the caller, the JVM will need the RuntimePermission getClassLoader.

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 delegation chain of the caller,
the JVM will need the RuntimePermission `getClassLoader`.
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->content-handlerclj

(->content-handler)

Constructor.

Constructor.
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get-contentclj

(get-content this urlc)
(get-content this urlc 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.

The default implementation of this method should call getContent() and screen the return type for a match of the suggested types.

urlc - a URL connection. - java.net.URLConnection classes - an array of types requested - java.lang.Class[]

returns: the object read by the ContentHandler that is the first match of the suggested types. null if none of the requested are supported. - java.lang.Object

throws: java.io.IOException - if an I/O error occurs while reading the object.

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.

urlc - a URL connection. - `java.net.URLConnection`
classes - an array of types requested - `java.lang.Class[]`

returns: the object read by the ContentHandler that is
                 the first match of the suggested types.
                 null if none of the requested  are supported. - `java.lang.Object`

throws: java.io.IOException - if an I/O error occurs while reading the object.
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