[英]Printing text file with Java
我正在嘗試使用給定的代碼打印文本文件。 一切順利:作業進入打印機的打印隊列。 然而,經過一段時間后,它消失了,沒有打印出來。 此外,代碼中沒有異常或錯誤。 一切都很順利,除了它不打印。 我沒有使用打印API。
public class PipedPrint implements Runnable {
PipedOutputStream pos = new PipedOutputStream();
PipedInputStream pis = new PipedInputStream();
byte[] abPrinterBytes = null;
private void mainProcess() throws IOException, PrintException, InterruptedException {
abPrinterBytes = getBytesFromFile();
pis.connect(pos);
Thread randWriter = new Thread(this);
randWriter.start();
PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE;
PrintService printService[] = PrintServiceLookup.lookupPrintServices(flavor, pras);
PrintService defaultService = PrintServiceLookup.lookupDefaultPrintService();
PrintService service = ServiceUI.printDialog(null, 200, 200, printService, defaultService, flavor, pras);
if (defaultService != null) {
DocPrintJob job = defaultService.createPrintJob();
DocAttributeSet das = new HashDocAttributeSet();
Doc doc = new SimpleDoc(pis, flavor, das);
System.out.println("Main::Fired Print");
job.print(doc, pras);
System.out.println("Main::Done Print");
}
randWriter.join();
System.out.println("Main::Join Over");
}
private byte[] getBytesFromFile() throws IOException {
File fFile = new File("C:\\Users\\Wijdan\\Documents\\NetBeansProjects\\demo_print\\src\\demo_print\\pass.txt"); //File to print
byte[] abFileBytes = new byte[(int) fFile.length()];
BufferedInputStream in = new BufferedInputStream(new FileInputStream(fFile));
for (int i = 0; i < abFileBytes.length; i += in .read(abFileBytes, i, (abFileBytes.length - i)));
return abFileBytes;
}
public void run() {
try {
Thread.sleep(5000);
System.out.println("RandWriter started Writing");
for (int i = 0; i < abPrinterBytes.length; i += 400) {
pos.write(abPrinterBytes, i, ((i + 400) < abPrinterBytes.length) ? 400 : (abPrinterBytes.length - i));
System.out.println("Thread:: Wrote bytes. Sleeping....");
Thread.sleep(500);
}
pos.close();
System.out.println("Thread::Closed pos. Exitting Thread...");
} catch (Exception ie) {
ie.printStackTrace();
}
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
PipedPrint t1 = new PipedPrint();
try {
t1.mainProcess();
} catch (Exception e) {
e.printStackTrace();
}
}
}
檢查是否
所有進口都是:
import java.io.BufferedInputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.PipedInputStream; import java.io.PipedOutputStream;
import javax.print.Doc; import javax.print.DocFlavor; import javax.print.DocPrintJob; import javax.print.PrintException; import javax.print.PrintService; import javax.print.PrintServiceLookup; import javax.print.ServiceUI; import javax.print.SimpleDoc; import javax.print.attribute.DocAttributeSet; import javax.print.attribute.HashDocAttributeSet; import javax.print.attribute.HashPrintRequestAttributeSet; import javax.print.attribute.PrintRequestAttributeSet;
確保文件路徑有效
您當前的打印機在系統中設置為默認打印機,如果它正在工作
我試過你的代碼它在我的情況下運行正常。 我的打印機名稱是HP LaserJet 4250。
我認為它們可能是您要打印的文件大小的問題。 請嘗試以塊的形式發送文件,而不是一次發送所有文件。
然而,即使我在UI屏幕部分中單擊“取消”以取消打印,它仍然提供打印輸出。
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