download Document object using spring mvc without jsp - spring

Question

I am trying to create pdf file using POJO and download it using spring mvc.i have got the Document object but can not download the file. it gives error "could not find convertor".
#RequestMapping(value = "/downloadPDF", method = RequestMethod.GET)
public Document downloadPDF() throws FileNotFoundException, DocumentException {
// create some sample data
List<EmployeeInfo> employeeList = new ArrayList<EmployeeInfo>();
employeeList.add(new EmployeeInfo("1", "Anish", "surat"));
return downloadPDFService.createPDF(employeeList);
how can i download this file.
please provide answer
public Document createPDF( List<EmployeeInfo> employeeList) throws FileNotFoundException, DocumentException {
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("AddTableExample.pdf"));
document.open();
PdfPTable table = new PdfPTable(3);
table.setWidthPercentage(100); //Width 100%
table.setSpacingBefore(10f); //Space before table
table.setSpacingAfter(10f); //Space after table
PdfPCell cell = new PdfPCell();
cell.setBackgroundColor(BaseColor.BLUE);
cell.setPadding(5);
Font font = FontFactory.getFont(FontFactory.HELVETICA);
font.setColor(BaseColor.WHITE);
cell.setPhrase(new Phrase("Id", font));
table.addCell(cell);
cell.setPhrase(new Phrase("Name", font));
table.addCell(cell);
cell.setPhrase(new Phrase("Address", font));
table.addCell(cell);
for (EmployeeInfo aBook : employeeList) {
table.addCell(aBook.getEmpId());
table.addCell(aBook.getEmpName());
table.addCell(aBook.getEmpAddress());
}
document.add(table);
document.close();
writer.close();
return document;
}
this is a view creator.next is stack trace
HTTP Status 500 - Request processing failed; nested exception is java.lang.IllegalArgumentException:
No converter found for return value of type: class com.itextpdf.text.Document
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: No converter found for return value of type: class com.itextpdf.text.Document
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.IllegalArgumentException: No converter found for return value of type: class com.itextpdf.text.Document
org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:178)
org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:153)
org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:165)
org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:80)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:126)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:814)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

Answer 1

Though you don't want jsp, you still can use ModelAndView.
Change your DownloadPDFService as below.
#Component
public class DownloadPDFService extends AbstractPdfView {
#Override
protected void buildPdfDocument(Map<String, Object> model, Document doc,
PdfWriter writer, HttpServletRequest req, HttpServletResponse resp)
throws Exception {
// Retrieve your model as below
List<EmployeeInfo> employeeList = (List<EmployeeInfo>) model.get("employeeList");
// continue your document build logic
}
}
Change your controller as below
#RequestMapping(value = "/downloadPDF", method = RequestMethod.GET)
public Document downloadPDF() throws FileNotFoundException, DocumentException {
// create some sample data
List<EmployeeInfo> employeeList = new ArrayList<EmployeeInfo>();
employeeList.add(new EmployeeInfo("1", "Anish", "surat"));
return new ModelAndView("pdfView", "employeeList", employeeList);
}
Add below views configuration in views.properties
pdfView.(class)= YourpackageName.DownloadPDFService
Configure a new ResourceBundleViewResolver for above "views" properties.