java调用虚拟打印机,该怎么解决

java调用虚拟打印机
要实现  将上传的word 或者 excel 在下载过程中，可以调用虚拟打印机，输出 PDF 格式。具体怎么操作和代码编写。求大神指点啊、。。急急急
------解决思路----------------------

public void saveExcelAsPdf(String filePath, String outFile) 

		throws SystemException {

		ComThread.InitSTA();

		ActiveXComponent actcom = new ActiveXComponent("Excel.Application");

		Dispatch workbooks = null;

		Dispatch workbook = null;


		try {			

			actcom.setProperty("Visible", new Variant(false));


			workbooks = actcom.getProperty("Workbooks").toDispatch();

			workbook = Dispatch.invoke(

					workbooks,

					"Open",

					Dispatch.Method,

					new Object[] { filePath, 

							new Variant(false),

							new Variant(false) //readonly

					}, new int[9]).toDispatch();



			Dispatch.invoke(workbook, "SaveAs", Dispatch.Method, new Object[] {

					outFile, new Variant(57), new Variant(false),

					new Variant(57), new Variant(57), new Variant(false),

					new Variant(true), new Variant(57), new Variant(false),

					new Variant(true), new Variant(false) }, new int[1]);


			Dispatch.call(workbook, "Close", new Object[] { new Variant(false) });

			if (actcom != null) {

				actcom.invoke("Quit", new Variant[] {});

				actcom = null;

			}

			ComThread.Release();


		} catch (Exception e) {

			throw new SystemException(e.getMessage());

		} finally {

			if (actcom != null) {

				actcom.invoke("Quit", new Variant[] {});

				actcom = null;

			}

			ComThread.Release();

		}

	}



public  static void  print(String path)throws SystemException {   

		String PRINT_NAME="xxxxxxxxx";//打印机名称

		//初始化COM线程

        ComThread.InitSTA();

        ActiveXComponent xl=new ActiveXComponent("Excel.Application");

        try { 

        	

            //设置是否显示打开Excel  

            Dispatch.put(xl, "Visible", new Variant(true));

            //打开具体的工作簿

            Dispatch workbooks = xl.getProperty("Workbooks").toDispatch(); 

            Dispatch excel=Dispatch.call(workbooks,"Open",path).toDispatch(); 

            

            //设置打印属性并打印

            Dispatch.callN(excel,"PrintOut",new Object[]{Variant.VT_MISSING, Variant.VT_MISSING, new Integer(1),

                    new Boolean(false),PRINT_NAME, new Boolean(true),Variant.VT_MISSING, ""});

            

            //关闭文档

           Dispatch.call(excel, "Close", new Variant(false));  

        } catch (Exception e) { 

            e.printStackTrace();

            throw new SystemException(e.getMessage());

        } finally{

            xl.invoke("Quit",new Variant[0]);

            //始终释放资源 

            ComThread.Release(); 

        } 

	}

word 也差不多，具体很多参数去网上搜搜看看。