Java中的扩展打印机信息 [英] Extended printer information in Java

问题描述

我正在尝试获取有关系统上打印机的一些信息。

在Windows和Linux上，使用此代码，只有 PrinterName 属性已填充：

I'm trying to get some information about the printers on my system.
On Windows and Linux, with this code, only the PrinterName attribute is filled:

PrintService[] printServices = PrintServiceLookup.lookupPrintServices(null,null);
for( PrintService printService : printServices ) {
    log.info("Found print service: "+printService);
    log.info(printService.getAttribute(PrinterName.class));
    log.info(printService.getAttribute(PrinterLocation.class));
    log.info(printService.getAttribute(PrinterMakeAndModel.class));
    log.info(printService.getAttribute(PrinterMessageFromOperator.class));
    log.info(printService.getAttribute(PrinterMoreInfo.class));
    log.info(printService.getAttribute(PrinterMoreInfoManufacturer.class));
    log.info(printService.getAttribute(PrinterState.class));
    log.info(printService.getAttribute(PrinterStateReasons.class));
    log.info(printService.getAttribute(PrinterURI.class));
}

使用 toArray（）后上面的功能......

After using the toArray() function on it...

log.info("Found print service: "+printService);
for( Attribute a : printService.getAttributes().toArray() ) {
    log.info("* "+a.getName()+": "+a);
}

...结果如下：

Found print service: Win32 Printer : Brother MFC-9420CN BR-Script3
* color-supported: supported
* printer-name: Brother MFC-9420CN BR-Script3
* printer-is-accepting-jobs: accepting-jobs
* queued-job-count: 0

如何获取更多信息，如打印机评论？

推荐答案

还有其他 PrintServiceAttribute 实现，但如果你想获取更多......

There are other PrintServiceAttribute implementations, but if you want to fetch more...

这只是一个脏代码，你可以还为doc flavor获取不受支持的值：

This is a dirty code only, you can also fetch unsupported values for doc flavor:

PrintService[] printServices =
        PrintServiceLookup.lookupPrintServices(null, null); //get printers

for (PrintService printService : printServices) {
    System.out.println("Found print service: " + printService);

    Set<Attribute> attribSet = new LinkedHashSet<Attribute>();

    Class<? extends Attribute>[] supportedAttributeCategories = (Class<? extends Attribute>[]) printService.getSupportedAttributeCategories();

    for (Class<? extends Attribute> category : supportedAttributeCategories) {
        DocFlavor[] flavors = printService.getSupportedDocFlavors();
        for (DocFlavor flavor : flavors) {
            Object supportedAttributeValues = printService.getSupportedAttributeValues(category, flavor, printService.getAttributes());
            if (supportedAttributeValues instanceof Attribute) {
                Attribute attr = (Attribute) supportedAttributeValues;
                attribSet.add(attr);
            } else if (supportedAttributeValues != null) {
                Attribute[] attrs = (Attribute[]) supportedAttributeValues;
                for (Attribute attr : attrs) {
                    attribSet.add(attr);
                }
            }
        }
    }

    for (Attribute attr : attribSet) {
        System.out.println(attr.getName());

        System.out.println(printService.getDefaultAttributeValue(attr.getCategory()));
    }
}

注意：你可以看到重复的值，但可以过滤它们。

Note: You may see repeated values, but they can be filtered.

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