java如何实现打印 demo

突然想到用JAVA来打印东西，就在网上找了个简单DEMO，先收藏。。。

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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;   public class MyPrint {       public static void main(String[] args) {               File file = new File("D:/test.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);                     fis.close();                 } catch (Exception e) {                     e.printStackTrace();                 }             } //        }     } }