0/获取打印服务对象(寻找打印机) 1/继承Printable实现接口方法print，以便打印机进行打印 2/用Graphics2D直接输出、用TextLayout直接输出、用lineBreaker输出多行文本 -0/Get the print service objects (look for the printer) 1/Printable inherited interface method print, so the printer can print 2/using the