我需要知道打印机状态。我需要使用 Java 程序控制打印机状态。例子
- 检查打印机状态,天气是否接受作业,
- 没纸了
- 打印机队列
- 碳粉
- 等等..
我知道有一种方法可以检查基本信息,例如名称、颜色是否支持。但我找不到任何检查纸张、碳粉、作业队列的示例。我想知道是否可以使用 Java API。我找到了用于打印机功能的大 API,但他们没有给出如何使用它的简单示例。
看看这个PrinterStateReason。还有javax.print。
有人告诉我可以通过这种方式检查打印机状态:
PrintService printService = PrintServiceLookup.lookupDefaultPrintService();
AttributeSet attributes = printService.getAttributes();
String printerState = attributes.get(PrinterState.class).toString();
String printerStateReason = attributes.get(PrinterStateReason.class).toString();
System.out.println("printerState = " + printerState); // May be IDLE, PROCESSING, STOPPED or UNKNOWN
System.out.println("printerStateReason = " + printerStateReason); // If your printer state returns STOPPED, for example, you can identify the reason
if (printerState.equals(PrinterState.STOPPED.toString()) {
if (printerStateReason.equals(PrinterStateReason.TONER_LOW.toString()) {
System.out.println("Toner level is low.");
}
}
可悲的是,我的打印机似乎不支持printerState,所以我无法测试它。
无法获得打印机的完整状态。打印机有一个能够请求服务的本机驱动程序,但是因为有很多可能的打印机功能,Java 只支持它的一个子集。
您实际上可以通过调用为用户提供修改状态
PrinterJob pj = PrinterJob.getPrinterJob();
pj.printDialog()
它显示了本机打印机对话框。尽管 javax.print API 中提供了可以检查打印机状态的信息,但我无法为我的打印机执行此操作!。(佳能)。
要检查的代码:
import javax.print.*;
import javax.print.attribute.DocAttributeSet;
import javax.print.attribute.PrintServiceAttributeSet;
import javax.print.attribute.standard.PrinterStateReason;
import javax.print.attribute.standard.PrinterStateReasons;
import javax.print.attribute.standard.Severity;
import javax.print.event.*;
import java.awt.*;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import java.io.*;
import java.util.Set;
/**
* PrintTest
*/
public class PrintTest implements PrintServiceAttributeListener,PrintJobListener,Doc, Printable, PrintJobAttributeListener {
private static final transient String TEXT = "12345";
public static void main(String[] args) {
PrintTest test = new PrintTest();
test.checkPrinters();
}
public void checkPrinters() {
Thread newThread = new Thread(new Runnable() {
public void run() {
PrintService ps = PrinterJob.getPrinterJob().getPrintService();
DocFlavor[] myFlavors = ps.getSupportedDocFlavors();
ps.addPrintServiceAttributeListener(PrintTest.this);
DocPrintJob docJob = ps.createPrintJob();
docJob.addPrintJobAttributeListener(PrintTest.this, null);
docJob.addPrintJobListener(PrintTest.this);
try {
docJob.print(PrintTest.this,null);
}
catch (PrintException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
} });
newThread.start();
/**
PrintServiceAttributeSet attSet = ps.getAttributes();
PrinterStateReasons psr = ps.getAttribute(PrinterStateReasons.class);
if (psr != null) {
Set<PrinterStateReason> errors = psr.printerStateReasonSet(Severity.REPORT);
for (PrinterStateReason reason : errors)
System.out.printf(" Reason : %s",reason.getName());
System.out.println();
} */
}
public void attributeUpdate(PrintServiceAttributeEvent psae) {
System.out.println(psae.getAttributes());
}
public void printDataTransferCompleted(PrintJobEvent pje) {
System.out.println("Transfer completed");
}
public void printJobCompleted(PrintJobEvent pje) {
System.out.println("Completed");
}
public void printJobFailed(PrintJobEvent pje) {
System.out.println("Failed");
PrinterStateReasons psr = pje.getPrintJob().getPrintService().getAttribute(PrinterStateReasons.class);
if (psr != null) {
Set<PrinterStateReason> errors = psr.printerStateReasonSet(Severity.REPORT);
for (PrinterStateReason reason : errors)
System.out.printf(" Reason : %s",reason.getName());
System.out.println();
}
}
public void printJobCanceled(PrintJobEvent pje) {
System.out.println("Canceled");
}
public void printJobNoMoreEvents(PrintJobEvent pje) {
System.out.println("No more events");
}
public void printJobRequiresAttention(PrintJobEvent pje) {
System.out.println("Job requires attention");
PrinterStateReasons psr = pje.getPrintJob().getPrintService().getAttribute(PrinterStateReasons.class);
if (psr != null) {
Set<PrinterStateReason> errors = psr.printerStateReasonSet(Severity.REPORT);
for (PrinterStateReason reason : errors)
System.out.printf(" Reason : %s",reason.getName());
System.out.println();
}
}
public DocFlavor getDocFlavor() {
return DocFlavor.SERVICE_FORMATTED.PRINTABLE; //To change body of implemented methods use File | Settings | File Templates.
}
public Object getPrintData() throws IOException {
return this;
}
public DocAttributeSet getAttributes() {
return null; //To change body of implemented methods use File | Settings | File Templates.
}
public Reader getReaderForText() throws IOException {
return null; //To change body of implemented methods use File | Settings | File Templates.
}
public InputStream getStreamForBytes() throws IOException {
return null; //To change body of implemented methods use File | Settings | File Templates.
}
public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException {
return pageIndex == 0 ? PAGE_EXISTS : NO_SUCH_PAGE; //To change body of implemented methods use File | Settings | File Templates.
}
public void attributeUpdate(PrintJobAttributeEvent pjae) {
System.out.println("Look out");
}
}
我试图通过故意打开机箱或取出纸张来获得 PrinterReasonsState,但我没有成功。也许其他人可以展示它是如何实现的,但到目前为止,API 似乎提供了更多实际上不可用的功能。
或者简而言之:它不起作用,至少不适用于我的打印机。
更新: 而不是查询 WMI“win32_printer”对象,我建议直接像这样使用 Powershell,它的 API 更简洁:
Get-Printer | where PrinterStatus -like 'Normal' | fl
要查看所有打印机和状态:
Get-Printer | fl Name, PrinterStatus
查看所有属性:
Get-Printer | fl
您仍然可以在 Java 中使用 ProcessBuilder,如下所述。
更新前:
仅适用于 Windows 的解决方案。在 Windows 中,您可以查询 WMI "win32_printer" 类,因此您可以检查操作系统层上的状态:Win32_Printer 类
在 Java 中,您可以像这样使用 ProcessBuilder 来启动 PowerShell 并像这样执行 PS 脚本:
String printerName = "POS_PRINTER";
ProcessBuilder builder = new ProcessBuilder("powershell.exe", "get-wmiobject -class win32_printer | Select-Object Name, PrinterState, PrinterStatus | where {$_.Name -eq '"+printerName+"'}");
String fullStatus = null;
Process reg;
builder.redirectErrorStream(true);
try {
reg = builder.start();
fullStatus = getStringFromInputStream(reg.getInputStream());
reg.destroy();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
System.out.print(fullStatus);
将 InputStream 转换为 String 后,您应该得到类似的结果:
Name PrinterState PrinterStatus
---- ------------ -------------
POS_PRINTER 0 3
状态和状态应根据各种情况(打印机关闭、缺纸、盖板打开……)而变化。
这应该可以,但取决于打印机和驱动程序。我将它与带有 ESDPRT 端口的 EPSON TM 打印机一起使用,我可以获得如下信息:无纸、盖板打开、打印机离线/关闭、打印机暂停。
这里有更全面的答案:-我的 StackOverflow 对类似问题的回答。