用java实现打印功能用java实现打印，java.awt中提供了一些打印的API,要实现打印，首先要获得打印对象，然后继承Printable实现接口方法print，以便打印机进行打印，最后用用Graphics2D直接输出直接输出。-Using java to achieve print function to print using java, java.awt provides some printing API, to achieve print, we must first obtain a print object, and then implement the interface methods inherited Printable print, so the printer to print, and finally with direct output with Graphics2D direct output.