本文介绍了如何在客户端jsp上显示报告？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试在jsp页面中显示结果。在我的In dex.html中有一个链接，
< a href =vehicleReport.jsp>车辆报告< / a>
I am trying to display the result in jsp page. In my In dex.html has a link as ,<a href="vehicleReport.jsp">Vehicle Report</a>
在 vehicleReport.jsp 我显示报告为，
<body>
<%
Connection con=null;
try{
con=VehicleDetails.getConnection();
InputStream inputStream = new FileInputStream ("E:/ReportFld/report4.jrxml");
Map parameters = new HashMap();
JasperDesign jasperDesign = JRXmlLoader.load(inputStream);
JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);
@SuppressWarnings("unchecked")
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, con);
out.clear(); // where out is a JspWriter
out = pageContext.pushBody();
JasperExportManager.exportReportToPdfStream(jasperPrint, response.getOutputStream());
}
catch(Exception e){e.printStackTrace();}
finally{
con.close();
}
%>
</body>
但问题是报告不可见。在jsp中它显示一些不可读的文本。我收到错误信息，
But problem is report is not visible. In jsp it displays some unreadable text. and I am getting error message as,
SEVERE: Servlet.service() for servlet [jsp] in context with path [/Reports] threw exception [java.lang.IllegalStateException: getOutputStream() has already been called for this response] with root cause
java.lang.IllegalStateException: getOutputStream() has already been called for this response
at org.apache.catalina.connector.Response.getWriter(Response.java:636)
at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:213)
at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:125)
如何解决这个问题？
推荐答案
尝试使用
JasperExportManager.exportReportToPdfFile(JasperPrint jsperPring, String fileName);
而不是
JasperExportManager.exportReportToPdfStream(jasperPrint, response.getOutputStream());
然后在浏览器或任何你想要的地方显示你的PDF格式。
and then display your pdf in browser or anywhere you want.
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