运行时替换，应该这样
复制内容到剪贴板
代码:
ReportJob job = new ReportJob(new FileInputStream("d:/a.xml"));
DatasetNodeSource dns = job.getDocument().getNodeSource().getNodeSourceByTagName("学生表");
SqlReader sr = new SqlReader();
sr.setSql("SELECT * FROM 订单查询");
sr.setConn(getConnection33());
sr.setName("订单明细");
dns.setReader((jatools.data.reader.DatasetReader)sr);
//dns.setTagName("RESULT_0");
job.printAsXLS(new FileOutputStream("d:/a.xls"));
