Java - 检查文件是否在打印队列/正在使用中

Question

好的，我有一个程序:

1. 创建一个临时文件基于 用户输入
2. 打印文件(可选)
3. 删除文件(可选)

我的问题在阶段 2 和阶段 3 之间，我需要等待文件完成打印，直到我可以删除它。

仅供引用:打印需要 5-10 分钟(大文件在旧计算机上假脱机)

所以我需要从 Java 中检查是否:

• 默认打印队列为空

• 文件正在使用中(注意:打印时 File.canWrite() 返回 true)

Answer 1

您检查过 Java Print API 了吗？来自 http://download.oracle.com/javase/1.4.2/docs/api/javax/print/event/PrintJobListener.html :

public interface

PrintJobListener

Implementations of this listener interface should be attached to a DocPrintJob to monitor the status of the printer job.

我想你可以提交一个打印作业，然后通过它监控它的状态。

exampledepot.com/egs/javax.print/WaitForDone.html: 中还有一个相当完整的示例(注意:URL 似乎已经改变，并指向潜在的恶意软件)

try {
    // Open the image file
    InputStream is = new BufferedInputStream(
        new FileInputStream("filename.gif"));
    // Create the print job
    DocPrintJob job = service.createPrintJob();
    Doc doc = new SimpleDoc(is, flavor, null);

    // Monitor print job events
    PrintJobWatcher pjDone = new PrintJobWatcher(job);

    // Print it
    job.print(doc, null);

    // Wait for the print job to be done
    pjDone.waitForDone();

    // It is now safe to close the input stream
    is.close();
} catch (PrintException e) {
} catch (IOException e) {
}

class PrintJobWatcher {
    // true iff it is safe to close the print job's input stream
    boolean done = false;

    PrintJobWatcher(DocPrintJob job) {
        // Add a listener to the print job
        job.addPrintJobListener(new PrintJobAdapter() {
            public void printJobCanceled(PrintJobEvent pje) {
                allDone();
            }
            public void printJobCompleted(PrintJobEvent pje) {
                allDone();
            }
            public void printJobFailed(PrintJobEvent pje) {
                allDone();
            }
            public void printJobNoMoreEvents(PrintJobEvent pje) {
                allDone();
            }
            void allDone() {
                synchronized (PrintJobWatcher.this) {
                    done = true;
                    PrintJobWatcher.this.notify();
                }
            }
        });
    }
    public synchronized void waitForDone() {
        try {
            while (!done) {
                wait();
            }
        } catch (InterruptedException e) {
        }
    }
}