我正在尝试在对话框中显示打印机位置。但令我惊讶的是，似乎没有打印服务具有位置属性——尽管我验证了我的一些打印机确实在 Windows 打印机控制面板中显示了位置。
我使用此代码打印位置（它始终为该位置打印“null”）。我的 Java 版本是 1.7.0_21：
public class PrintLocation {
public static void main(String[] argv) {
PrintService[] services = PrintServiceLookup.lookupPrintServices(null, null);
for (PrintService service : services) {
Object location = service.getAttribute(PrinterLocation.class);
System.out.println(service.getName() + " - " + location);
}
}
}
这是 JRE 不支持/实现的还是我在这里做错了什么？如何获取打印机的位置？
编辑：我机器上的输出是：
\\srv51\SIR-2725-01_KX_color - null
\\srv51\SIR-2725-01_KX_sw - null
Microsoft XPS Document Writer - null
Microsoft Office Document Image Writer - null
FreePDF XP - null
EDIT2：按照建议，我打印出所有属性：
PrintService[] services = PrintServiceLookup.lookupPrintServices(null, null);
for (PrintService service : services) {
PrintServiceAttributeSet attrs = service.getAttributes();
System.out.println("Service: " + service.getName());
int i = 1;
for (Object attr : attrs.toArray()) {
System.out.println("Attr #" + i + ": " + attr.getClass().getSimpleName()
+ ", " + attr);
++i;
}
}
我得到了：
Service: \\srv51\SIR-2725-01_KX_color
Attr #1: ColorSupported, supported
Attr #2: PrinterName, \\srv51\SIR-2725-01_KX_color
Attr #3: QueuedJobCount, 0
Attr #4: PrinterIsAcceptingJobs, accepting-jobs
Service: \\srv51\SIR-2725-01_KX_sw
Attr #1: ColorSupported, supported
Attr #2: PrinterName, \\srv51\SIR-2725-01_KX_sw
Attr #3: QueuedJobCount, 0
Attr #4: PrinterIsAcceptingJobs, accepting-jobs
Service: Microsoft XPS Document Writer
Attr #1: ColorSupported, supported
Attr #2: PrinterName, Microsoft XPS Document Writer
Attr #3: QueuedJobCount, 0
Attr #4: PrinterIsAcceptingJobs, accepting-jobs
Service: Microsoft Office Document Image Writer
Attr #1: ColorSupported, not-supported
Attr #2: PrinterName, Microsoft Office Document Image Writer
Attr #3: QueuedJobCount, 0
Attr #4: PrinterIsAcceptingJobs, accepting-jobs
Service: FreePDF XP
Attr #1: ColorSupported, supported
Attr #2: PrinterName, FreePDF XP
Attr #3: QueuedJobCount, 0
Attr #4: PrinterIsAcceptingJobs, accepting-jobs
因此，我的机器上的任何打印机都不存在 PrinterLocation。