Document views PDFExcel Property
23.10 Document views PDFExcel
Introduction Returning an HTML page isn’t always the best way for the user to view the model output, and Spring makes it simple to generate a PDF document or an Excel spreadsheet dynamically from the model data. The document is the view and will be streamed from the server with the correct content type to hopefully enable the client PC to run their spreadsheet or PDF viewer application in response. In order to use Excel views, you need to add the poi library to your classpath, and for PDF generation, the iText library. 4.3.9.RELEASE Spring Framework 591 Configuration and setup Document based views are handled in an almost identical fashion to XSLT views, and the following sections build upon the previous one by demonstrating how the same controller used in the XSLT example is invoked to render the same model as both a PDF document and an Excel spreadsheet which can also be viewed or manipulated in Open Office. Document view definitions First, let’s amend the views.properties file or xml equivalent and add a simple view definition for both document types. The entire file now looks like this with the XSLT view shown from earlier: home.class=xslt.HomePage home.stylesheetLocation=WEB-INFxslhome.xslt home.root=words xl.class=excel.HomePage pdf.class=pdf.HomePage If you want to start with a template spreadsheet or a fillable PDF form to add your model data to, specify the location as the url property in the view definition Controller code The controller code we’ll use remains exactly the same from the XSLT example earlier other than to change the name of the view to use. Of course, you could be clever and have this selected based on a URL parameter or some other logic - proof that Spring really is very good at decoupling the views from the controllers Subclassing for Excel views Exactly as we did for the XSLT example, we’ll subclass suitable abstract classes in order to implement custom behavior in generating our output documents. For Excel, this involves writing a subclass of org.springframework.web.servlet.view.document.AbstractExcelView for Excel files generated by POI or org.springframework.web.servlet.view.document.AbstractJExcelView for JExcelApi- generated Excel files and implementing the buildExcelDocument method. Here’s the complete listing for our POI Excel view which displays the word list from the model map in consecutive rows of the first column of a new spreadsheet: 4.3.9.RELEASE Spring Framework 592 package excel; imports omitted for brevity public class HomePage extends AbstractExcelView { protected void buildExcelDocumentMap model, HSSFWorkbook wb, HttpServletRequest req, HttpServletResponse resp throws Exception { HSSFSheet sheet; HSSFRow sheetRow; HSSFCell cell; Go to the first sheet getSheetAt: only if wb is created from an existing document sheet = wb.getSheetAt0; sheet = wb.createSheet Spring ; sheet.setDefaultColumnWidth short 12; write a text at A1 cell = getCellsheet, 0, 0; setTextcell, Spring-Excel test ; List words = List model.get wordList ; for int i=0; i words.size; i++ { cell = getCellsheet, 2+i, 0; setTextcell, String words.geti; } } } And the following is a view generating the same Excel file, now using JExcelApi: package excel; imports omitted for brevity public class HomePage extends AbstractJExcelView { protected void buildExcelDocumentMap model, WritableWorkbook wb, HttpServletRequest request, HttpServletResponse response throws Exception { WritableSheet sheet = wb.createSheet Spring , 0; sheet.addCell new Label0, 0, Spring-Excel test ; List words = List model.get wordList ; for int i = 0; i words.size; i++ { sheet.addCell new Label2+i, 0, String words.geti; } } } Note the differences between the APIs. We’ve found that the JExcelApi is somewhat more intuitive, and furthermore, JExcelApi has slightly better image-handling capabilities. There have been memory problems with large Excel files when using JExcelApi however. If you now amend the controller such that it returns xl as the name of the view return new ModelAndViewxl, map; and run your application again, you should find that the Excel spreadsheet is created and downloaded automatically when you request the same page as before. 4.3.9.RELEASE Spring Framework 593 Subclassing for PDF views The PDF version of the word list is even simpler. This time, the class extends org.springframework.web.servlet.view.document.AbstractPdfView and implements the buildPdfDocument method as follows: package pdf; imports omitted for brevity public class PDFPage extends AbstractPdfView { protected void buildPdfDocumentMap model, Document doc, PdfWriter writer, HttpServletRequest req, HttpServletResponse resp throws Exception { List words = List model.get wordList ; for int i=0; iwords.size; i++ { doc.add new ParagraphString words.geti; } } } Once again, amend the controller to return the pdf view with return new ModelAndViewpdf, map; , and reload the URL in your application. This time a PDF document should appear listing each of the words in the model map.23.11 JasperReports
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