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我有下面的代码,但是当我运行它时,我得到一个消息框出现说OPeration失败,为什么这样做,它是什么解决方案aviable运行,代码应该只是让用户从一个txt文件打印java - 执行失败
代码:
import java.io.*;
import javax.swing.JOptionPane;
import javax.print.*;
import javax.print.attribute.DocAttributeSet;
import javax.print.attribute.HashDocAttributeSet;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
public class printimg
{
public void printimg() throws FileNotFoundException, PrintException, InterruptedException {
String filename = ("item.text"); // THIS IS THE TEXT FILE TO PRINT
try{
PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
DocFlavor flavor = DocFlavor.INPUT_STREAM.TEXT_PLAIN_UTF_8; // FILE IS .txt TYPE
PrintService printService[] =
PrintServiceLookup.lookupPrintServices(flavor, pras);
PrintService defaultService =
PrintServiceLookup.lookupDefaultPrintService();
PrintService service = ServiceUI.printDialog(null, 200, 200,
printService, defaultService, flavor, pras);
if (service != null) {
DocPrintJob job = service.createPrintJob();
FileInputStream fis = new FileInputStream(filename);
DocAttributeSet das = new HashDocAttributeSet();
Doc doc = new SimpleDoc(fis, flavor, das);
job.print(doc, pras);
}
}
catch(Exception a){
JOptionPane.showMessageDialog(null, "OPeration Failed");
}
}
}
我现在收到此错误:
java.lang.IllegalArgumentException: services must be non-null and non-empty
at javax.print.ServiceUI.printDialog(ServiceUI.java:167)
at printimg.printimg(printimg.java:20)
at __SHELL8.run(__SHELL8.java:8)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at bluej.runtime.ExecServer$3.run(ExecServer.java:725)
异常堆栈跟踪将有帮助 – MrSmith42
您应该记录或打印异常('a')来找出问题 –
我正在使用bluej,并且看不到任何堆栈跟踪或任何东西,正在尝试调试它 – user1892955