用jsf primefaces生成和下载jsf格式的jsper报表 [英] Jasper report Generation and downloading pdf in jsf primefaces

问题描述

我可以生成pdf格式的Jasper报告。我有如下所示的对话框

    <p:dialog id="courseListDia" header="Student Profile" widgetVar="courseEdit" resizable="true"  
               showEffect="fade" hideEffect="fade" appendTo="@(body)">  


                     <h:form id="courseForm">
                     <h:panelGrid columns="2" id="profile"> 
                         <p:graphicImage id="photo1" alt="No Image" value="/images/#{studentDetailsBeans.clickedStudent.imageUrl}" width="100px" />     
                           <h:panelGrid columns="2" id="Details"> 
                           <p:outputLabel value="Student Name"/>
                           <p:outputLabel value="#{studentDetailsBeans.clickedStudent.studentFirstName} #{studentDetailsBeans.clickedStudent.studentLastName}"  />
                           <p:outputLabel value="Date of Birth"/> 
                           <h:outputText value="#{studentDetailsBeans.clickedStudent.studentDob}">                       
                           <f:convertDateTime pattern="dd.MM.yyyy"/>
                           </h:outputText>
                           <p:outputLabel value="Age: #{studentDetailsBeans.age}"/> 
                           <p:outputLabel value=""/> 
                           <p:outputLabel value="Emergency Number:   "/> 
                            <p:outputLabel value=" #{studentDetailsBeans.clickedStudent.studentEmno}"/> 

                           </h:panelGrid>
                     </h:panelGrid>
                      <h:panelGrid columns="2" id="cyclegroup"> 
                    <p:outputLabel for="cycle" value="Cycle:" />
                     <p:selectOneRadio id="cycle" value="#{studentDetailsBeans.selectedCycle}" converter="cycconv"  >
                       <f:selectItems value="#{studentDetailsBeans.cycleListForStudent}" var="cyc" itemLabel="#{cyc.cycleNo}" itemValue="#{cyc}"/>
                       <p:ajax listener="#{studentDetailsBeans.changeCycle}"    update="timinggroup" process="cycle" />
                     </p:selectOneRadio>
                     </h:panelGrid>
                     <h:panelGrid columns="2" id="timinggroup"> 
                            <p:outputLabel for="course_8" value="Course Starting At 8" />  
                    <p:selectOneMenu id="course_8" value="#{studentDetailsBeans.selectedCourse8}" effect="fade"  converter="courseconv"  >  
                     <f:selectItem itemLabel="Select One" itemValue="" />  
                     <f:selectItems value="#{studentDetailsBeans.courseAt8}" var="c" itemValue="#{c}" itemLabel="#{c.courseName}" />  
                     <p:ajax update="timinggroup" listener="#{studentDetailsBeans.courseChangeListener()}"/>
                    </p:selectOneMenu>  
                     <p:outputLabel for="course_9" value="Course Starting At 9" />                          
                     <p:selectOneMenu id="course_9" value="#{studentDetailsBeans.selectedCourse9}" effect="fade"  converter="courseconv"  >  
                     <f:selectItem itemLabel="Select One" itemValue="" />  
                     <f:selectItems value="#{studentDetailsBeans.courseAt9}" var="c" itemValue="#{c}" itemLabel="#{c.courseName}" />  
                      <p:ajax  process="course_9" update="course_10" listener="#{studentDetailsBeans.courseChangeListener()}"/>
                     </p:selectOneMenu>  
                     <p:outputLabel for="course_10" value="Course Starting At 10" />                          
                     <p:selectOneMenu id="course_10" value="#{studentDetailsBeans.selectedCourse10}" effect="fade"  converter="courseconv" disabled="#{admissionFormBean.pd1}" >  
                     <f:selectItem itemLabel="Select One" itemValue="" />  
                     <f:selectItems value="#{studentDetailsBeans.courseAt10}" var="c" itemValue="#{c}" itemLabel="#{c.courseName}" />  
                      <p:ajax update="timinggroup" listener="#{studentDetailsBeans.courseChangeListener()}"/>
                     </p:selectOneMenu>  
                        <p:outputLabel for="course_11" value="Course Starting At 11" />                          
                        <p:selectOneMenu id="course_11" value="#{studentDetailsBeans.selectedCourse11}" effect="fade"  converter="courseconv"  >  
                     <f:selectItem itemLabel="Select One" itemValue="" />  
                     <f:selectItems value="#{studentDetailsBeans.courseAt11}" var="c" itemValue="#{c}" itemLabel="#{c.courseName}" />  
                     <p:ajax process="course_11" update="course_12" listener="#{studentDetailsBeans.courseChangeListener()}"/>
                        </p:selectOneMenu>  
                         <p:outputLabel for="course_12" value="Course Starting At 12" />                          
                         <p:selectOneMenu id="course_12" value="#{studentDetailsBeans.selectedCourse12}" effect="fade"  converter="courseconv" disabled="#{admissionFormBean.pd2}" >  
                     <f:selectItem itemLabel="Select One" itemValue="" />  
                     <f:selectItems value="#{studentDetailsBeans.courseAt12}" var="c" itemValue="#{c}" itemLabel="#{c.courseName}" />  
                     <p:ajax  update="timinggroup" listener="#{studentDetailsBeans.courseChangeListener()}"/>
                         </p:selectOneMenu>  
                         <p:commandButton value="ID Card" process="@this" actionListener="#{studentDetailsBeans.getIdCardPDF()}"/>

                     </h:panelGrid>

                     </h:form>

                 </p:dialog>   




                         <p:commandButton value="ID Card" process="@this" actionListener="#{studentDetailsBeans.getIdCardPDF()}"/>

这将触发我的操作侦听器，它正在生成报告并将其写入我的系统驱动器。但我无法将该文件作为可下载项目获取。

public void PDF(String name) throws JRException, IOException{  
       init();  
       HttpServletResponse httpServletResponse=(HttpServletResponse)FacesContext.getCurrentInstance().getExternalContext().getResponse();  
       httpServletResponse.addHeader("Content-disposition", "attachment; filename="+name+".pdf");  
       ServletOutputStream servletOutputStream=httpServletResponse.getOutputStream();  
       JasperExportManager.exportReportToPdfStream(jasperPrint, servletOutputStream);  
       System.out.println("All done the report is done");
       servletOutputStream.flush();
       servletOutputStream.close(); 
       FacesContext.getCurrentInstance().responseComplete();  
   }  

我正在把报告放到我的驱动器里。在我看来什么都不会发生。我仍然站在同一个对话框中。我期待一个pdf下载或点击这个命令按钮直接打印。请给出您的建议。我已经读到来自P：Dialog的AJAX调用将不会呈现为pdf。我已在正常链接中实现了报告下载。但无法从对话框或使用命令按钮进行下载。

jsf

您应该在FacesContext上调用responseComplete，以通知推荐答案运行时它应该缩短响应生命周期，将控制权移交给您

  public void PDF(String name) throws JRException, IOException{  
   init();  
   HttpServletResponse httpServletResponse=(HttpServletResponse)FacesContext.getCurrentInstance().getExternalContext().getResponse();  
   httpServletResponse.addHeader("Content-disposition", "attachment; filename="+name+".pdf");  

   FacesContext.getCurrentInstance().responseComplete();


   ServletOutputStream servletOutputStream=httpServletResponse.getOutputStream();  
   JasperExportManager.exportReportToPdfStream(jasperPrint, servletOutputStream);  
   System.out.println("All done the report is done");
   servletOutputStream.flush();
   servletOutputStream.close(); 
   FacesContext.getCurrentInstance().responseComplete();  
  }  

还请记住，您不能使用Ajax请求来生成文件下载。需要完整的HTTP请求。这意味着您必须在<p:commandButton/>上使用ajax="false"或使用<h:commandButton/>

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