JSP调用Crystal Report Viewer

Question

我遇到来自JSP的call crystal reports viewer的问题，这是我的项目结构：

CrystalReport-viewer.jsp可以调用水晶报表查看器（Web内容中的文件），但名为Viewer1.jsp的文件无法调用水晶报表查看器。为什么？因为目录文件夹是jsp吗？错误显示：

The viewer was unable to find the resources required to render the report.
Please check the following to resolve the issue.
1. Verify that ../crystalreportviewers/ is accessible to your WebApp and is the correct path to the viewer resources.
2. You may customize this location by altering the crystal_image_uri and crystal_image_use_relative properties in the web.xml.
3. Validate that the file crv.js exists at ../crystalreportviewers/js/crviewer/crv.js.

Viewer1.jsp

<%
    String report_name = "/modules/testing/Report2016.rpt";

    ReportClientDocument reportClientDoc = new ReportClientDocument();
    reportClientDoc.open(report_name, OpenReportOptions._openAsReadOnly);

    ParameterFieldController parameterFieldController = reportClientDoc
            .getDataDefController().getParameterFieldController();

    CrystalReportViewer crystalReportPageViewer = new CrystalReportViewer();
    IReportSource reportSource = reportClientDoc.getReportSource();
    crystalReportPageViewer.setReportSource(reportSource);
    crystalReportPageViewer.setReportSource(reportSource);
    crystalReportPageViewer.setOwnPage(true);
    crystalReportPageViewer.processHttpRequest(request, response,
            application, null);
%>

我用java servlet调用jsp。是否必须在web.xml中创建配置？如何解决这个问题？感谢。