java兑现调用打印机代码详解

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();
				}
			}
		}
	}
}