我能够生成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()}"/>
这将触发我的动作侦听器，并且它正在生成报告并将其写入我的系统驱动器中。但是我没有将文件作为可下载项获得。
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();
}
我正在开车中得到报告。我认为不会发生任何事情。我仍然站在同一对话框中。我希望单击此命令按钮可以下载pdf或直接打印。请提供您的建议。我已阅读到P：dialog的ajax调用将不会呈现pdf。我已经通过常规链接实现了报告下载。但是我无法通过对话框或使用命令按钮来完成报告。
您应该在responseComplete上调用FacesContext，以向JSF运行时发信号通知它应该缩短响应生命周期，并将控制权移交给您
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(); }还要记住，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
ajax="false"上使用<p:commandButton/>或使用<h:commandButton/>
JREmptyDataSource dataSource = new JREmptyDataSource();
JasperDesign desing = JRXmlLoader.load(this.getClass().getResourceAsStream("/com/po_life_report.jrxml"));
JasperReport report = JasperCompileManager.compileReport(desing);
JasperPrint jasperPrint = JasperFillManager.fillReport(report, item, dataSource);
response.setHeader("Content-Disposition", "inline; filename=report.pdf");
OutputStream outputStream = response.getOutputStream();
response.setContentType("application/pdf");
File f = File.createTempFile("test123", ".pdf");
JasperExportManager.exportReportToPdfStream(jasperPrint, new FileOutputStream(f));
byte[] bytes = Base64.encodeBase64(FileUtils.readFileToByteArray(f));// FileUtils.readFileToByteArray(f);// ;
byte[] output = new String(bytes, StandardCharsets.US_ASCII).getBytes();;
outputStream.write(output);
outputStream.flush();
outputStream.close();
在您的命令按钮处使用ajax =“ false”，否则碧玉报告将不起作用。