JDK14/Java14源码在线阅读

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/**
 * Provides the principal classes and interfaces for the Java™ Print
 * Service API. The Java Print Service API enables client and server
 * applications to:
 * <ul>
 *   <li>Discover and select print services based on their capabilities
 *   <li>Specify the format of print data
 *   <li>Submit print jobs to services that support the document type to be
 *   printed.
 * </ul>
 *
 * <h2>Print Service Discovery</h2>
 * An application invokes the static methods of the abstract class
 * {@link javax.print.PrintServiceLookup PrintServiceLookup} to locate print
 * services that have the capabilities to satisfy the application's print
 * request. For example, to print a double-sided document, the application first
 * needs to find printers that have the double-sided printing capability.
 * <p>
 * The JDK includes {@code PrintServiceLookup} implementations that can locate
 * the standard platform printers. To locate other types of printers, such as
 * IPP printers or JINI printers, a print-service provider can write
 * implementations of {@code PrintServiceLookup}. The print-service provider can
 * dynamically install these {@code PrintServiceLookup} implementations using
 * the {@link java.util.ServiceLoader} facility.
 *
 * <h2>Attribute Definitions</h2>
 * The {@link javax.print.attribute} and {@link javax.print.attribute.standard}
 * packages define print attributes, which describe the capabilities of a print
 * service, specify the requirements of a print job, and track the progress of a
 * print job.
 * <p>
 * The {@code javax.print.attribute} package describes the types of attributes
 * and how they can be collected into sets. The
 * {@code javax.print.attribute.standard} package enumerates all of the standard
 * attributes supported by the API, most of which are implementations of
 * attributes specified in the IETF Specification,
 * <a href="http://www.ietf.org/rfc/rfc2911.txt">RFC 2911 Internet Printing
 * Protocol, 1.1: Model and Semantics</a>, dated September 2000. The attributes
 * specified in {@code javax.print.attribute.standard} include common
 * capabilities, such as: resolution, copies, media sizes, job priority, and
 * page ranges.
 *
 * <h2>Document Type Specification</h2>
 * The {@link javax.print.DocFlavor DocFlavor} class represents the print data
 * format, such as JPEG or PostScript. A {@code DocFlavor} object consists of a
 * MIME type, which describes the format, and a document representation class
 * name that indicates how the document is delivered to the printer or output
 * stream. An application uses the {@code DocFlavor} and an attribute set to
 * find printers that can print the document type specified by the
 * {@code DocFlavor} and have the capabilities specified by the attribute set.
 *
 * <h2>Using the API</h2>
 * A typical application using the Java Print Service API performs these steps
 * to process a print request:
 * <ol>
 *   <li>Chooses a {@code DocFlavor}.
 *   <li>Creates a set of attributes.
 *   <li>Locates a print service that can handle the print request as specified
 *   by the {@code DocFlavor} and the attribute set.
 *   <li>Creates a {@link javax.print.Doc Doc} object encapsulating the
 *   {@code DocFlavor} and the actual print data, which can take many forms
 *   including: a Postscript file, a JPEG image, a {@code URL}, or plain text.
 *   <li>Gets a print job, represented by
 *   {@link javax.print.DocPrintJob DocPrintJob}, from the print service.
 *   <li>Calls the print method of the print job.
 * </ol>
 * The following code sample demonstrates a typical use of the Java Print
 * Service API: locating printers that can print five double-sided copies of a
 * Postscript document on size A4 paper, creating a print job from one of the
 * returned print services, and calling print.
 * <blockquote>
 * <pre>{@code
 * FileInputStream psStream;
 * try {
 *     psStream = new FileInputStream("file.ps");
 * } catch (FileNotFoundException ffne) {
 * }
 * if (psStream == null) {
 *     return;
 * }
 * DocFlavor psInFormat = DocFlavor.INPUT_STREAM.POSTSCRIPT;
 * Doc myDoc = new SimpleDoc(psStream, psInFormat, null);
 * PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
 * aset.add(new Copies(5));
 * aset.add(MediaSizeName.ISO_A4);
 * aset.add(Sides.DUPLEX);
 * PrintService[] services =
 * PrintServiceLookup.lookupPrintServices(psInFormat, aset);
 * if (services.length > 0) {
 *     DocPrintJob job = services[0].createPrintJob();

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