java控制打印机打印小票

Question

急求！！！！！！！！！！！！！！知道的说下谢谢！！  Doc doc = new SimpleDoc(this, flavor, das);
这里的this应该表示的打印对象，

Answer 1

this打印的结果是：TicketTest[frame0,0,0,0x0,invalid,hidden,layout=java.awt.BorderLayout,title=,resizable,normal,defaultCloseOperation=HIDE_ON_CLOSE,rootPane=javax.swing.JRootPane[,0,0,0x0,invalid,layout=javax.swing.JRootPane$RootLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777673,maximumSize=,minimumSize=,preferredSize=],rootPaneCheckingEnabled=true]
flavor打印的结果是：
application/x-java-jvm-local-objectref; class="java.awt.print.Printable"
das打印的结果是：
javax.print.attribute.HashDocAttributeSet@0

Answer 2

SimpleDoc函数源码是： try {
            repClass = Class.forName(flavor.getRepresentationClassName());
       } catch (Throwable e) {
           throw new IllegalArgumentException("unknown representation class");
       }
  
       if (!repClass.isInstance(printData)) {
           throw new IllegalArgumentException("data is not of declared type");
       }
repClass:interface java.awt.print.Printable
printData:TicketTest[frame0,0,0,0x0,invalid,hidden,layout=java.awt.BorderLayout,title=,resizable,normal,defaultCloseOperation=HIDE_ON_CLOSE,rootPane=javax.swing.JRootPane[,0,0,0x0,invalid,layout=javax.swing.JRootPane$RootLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777673,maximumSize=,minimumSize=,preferredSize=],rootPaneCheckingEnabled=true]
所以抛出异常，，知道怎么改的说下，急求！！

Answer 3

在类名那添加一个  implements ActionListener,Printable，实现了Printable接口，打印程序就能正常运行！