我正在尝试通过按钮生成 pdf 但我的问题是这种方法
JasperRunManager.runReportToPdfStream(reportStream,servletOutputStream, new HashMap<Object, Object>(), resultSetDataSource);
它不支持 Hashmap 它给出以下错误
The method runReportToPdfStream(InputStream, OutputStream, Map<String,Object>, Connection) in the type JasperRunManager is
not applicable for the arguments (InputStream, ServletOutputStream, HashMap<Object,Object>, JRResultSetDataSource)
它支持字符串参数，例如Hashmap<String,Object>在生成 pdf 时会出现以下错误
net.sf.jasperreports.engine.JRException: Error loading object from InputStream
at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:219)
at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:632)
at net.sf.jasperreports.engine.JasperRunManager.runToPdfStream(JasperRunManager.java:428)
at net.sf.jasperreports.engine.JasperRunManager.runReportToPdfStream(JasperRunManager.java:849)
at com.p41.jasper.Jasper.doPost(Jasper.java:103)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:546)
at com.sun.faces.application.view.JspViewHandlingStrategy.executePageToBuildView(JspViewHandlingStrategy.java:364)
at com.sun.faces.application.view.JspViewHandlingStrategy.buildView(JspViewHandlingStrategy.java:154)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:100)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) …