Class ContentHandler
- java.lang.Object
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- java.net.ContentHandler
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public abstract class ContentHandler extends Object
The abstract classContentHandleris the superclass of all classes that read anObjectfrom aURLConnection.An application does not generally call the
getContentmethod in this class directly. Instead, an application calls thegetContentmethod in classURLor inURLConnection. The application's content handler factory (an instance of a class that implements the interfaceContentHandlerFactoryset up by a call tosetContentHandler) is called with aStringgiving the MIME type of the object being received on the socket. The factory returns an instance of a subclass ofContentHandler, and itsgetContentmethod 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".
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Constructor Summary
Constructors Constructor and Description ContentHandler()
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method and Description abstract ObjectgetContent(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.ObjectgetContent(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.
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Method Detail
getContent
public abstract Object getContent(URLConnection urlc) throws 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:
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urlc- a URL connection. - Returns:
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the object read by the
ContentHandler. - Throws:
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IOException- if an I/O error occurs while reading the object.
getContent
public Object getContent(URLConnection urlc, Class[] classes) throws 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:
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urlc- a URL connection. -
classes- an array of types requested - Returns:
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the object read by the
ContentHandlerthat is the first match of the suggested types. null if none of the requested are supported. - Throws:
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IOException- if an I/O error occurs while reading the object. - Since:
- 1.3
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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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