java调用打印机

   import java.io.File;     import java.io.FileInputStream;     import javax.print.Doc;     import javax.print.DocFlavor;     import javax.print.DocPrintJob;     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.swing.JFileChooser;     /**     * 建立与打印机的连接     * @author Administrator     */     public class PrintDemo {     public static void main(String[] args) {     JFileChooser fileChooser = new JFileChooser(); //创建打印作业     int state = fileChooser.showOpenDialog(null);     if(state == fileChooser.APPROVE_OPTION){     File file = new File("D:/zkyzl.txt"); //获取选择的文件     //构建打印请求属性集     HashPrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();     //设置打印格式，因为未确定类型，所以选择autosense     DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE;     //查找所有的可用的打印服务     PrintService printService[] = PrintServiceLookup.lookupPrintServices(flavor, pras);     //定位默认的打印服务     PrintService defaultService = PrintServiceLookup.lookupDefaultPrintService();     //显示打印对话框     PrintService service = ServiceUI.printDialog(null, 200, 200, printService,     defaultService, flavor, pras);     if(service != null){     try {     DocPrintJob job = service.createPrintJob(); //创建打印作业     FileInputStream fis = new FileInputStream(file); //构造待打印的文件流     DocAttributeSet das = new HashDocAttributeSet();     Doc doc = new SimpleDoc(fis, flavor, das);     job.print(doc, pras);     } catch (Exception e) {     e.printStackTrace();     }     }     }     }     }