Examples of java.net.ContentHandler

java.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". @author James Gosling @version 1.20, 04/07/06 @see java.net.ContentHandler#getContent(java.net.URLConnection) @see java.net.ContentHandlerFactory @see java.net.URL#getContent() @see java.net.URLConnection @see java.net.URLConnection#getContent() @see java.net.URLConnection#setContentHandlerFactory(java.net.ContentHandlerFactory) @since JDK1.0

        // IMPLEMENTATION NOTE: Caching is not strictly necessary for
        // stream handlers since the Java runtime caches them. Caching is
        // performed for code consistency between stream and content
        // handlers and also because caching behavior may not be guaranteed
        // across different JRE implementations.
        ContentHandler handler = getFromContentCache(mimeType);


        if (handler != null)
        {
            return handler;
        }

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     *        java.lang.Class[])
     */
    public void test_getContent() throws IOException {
        URLConnection conn = new URL("http://www.apache.org").openConnection();
        Class[] classes = { Foo.class, String.class, };
        ContentHandler handler = new ContentHandlerImpl();
        ((ContentHandlerImpl) handler).setContent(new Foo());
        Object content = handler.getContent(conn, classes);
        assertEquals("Foo", ((Foo) content).getFoo());


        ((ContentHandlerImpl) handler).setContent(new FooSub());
        content = handler.getContent(conn, classes);
        assertEquals("FooSub", ((Foo) content).getFoo());


        Class[] classes2 = { FooSub.class, String.class, };
        ((ContentHandlerImpl) handler).setContent(new Foo());
        content = handler.getContent(conn, classes2);
        assertNull(content);
    }

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    public ContentHandler createContentHandler(final String mimeType) {
        for (Module module : modules) {
            ServiceLoader<ContentHandlerFactory> loader = module.loadService(ContentHandlerFactory.class);
            for (ContentHandlerFactory factory : loader) try {
                final ContentHandler handler = factory.createContentHandler(mimeType);
                if (handler != null) {
                    return handler;
                }
            } catch (RuntimeException e) {
                // ignored

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    public ContentHandler createContentHandler(final String mimeType) {
        for (Module module : modules) {
            ServiceLoader<ContentHandlerFactory> loader = module.loadService(ContentHandlerFactory.class);
            for (ContentHandlerFactory factory : loader) try {
                final ContentHandler handler = factory.createContentHandler(mimeType);
                if (handler != null) {
                    return handler;
                }
            } catch (RuntimeException e) {
                // ignored

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