Export Grid or Listbox to PDF or Excel"

From Documentation
Line 102: Line 102:
 
public void render(PdfPTable table, Food food, boolean isOddRow) {
 
public void render(PdfPTable table, Food food, boolean isOddRow) {
 
Font font = fontFactory.getFont(FontFactory.FONT_TYPE_CELL);
 
Font font = fontFactory.getFont(FontFactory.FONT_TYPE_CELL);
 +
 
PdfPCell cell = cellFactory.getCell(isOddRow);
 
PdfPCell cell = cellFactory.getCell(isOddRow);
 
 
cell.setPhrase(new Phrase(food.getName(), font));
 
cell.setPhrase(new Phrase(food.getName(), font));
 
table.addCell(cell);
 
table.addCell(cell);

Revision as of 08:23, 26 November 2012

Export Grid or Listbox to PDF or Excel

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DocumentationSmall Talks2012DecemberExport Grid or Listbox to PDF or Excel
Export Grid or Listbox to PDF or Excel

Author
Sam Chuang, Engineer, Potix Corporation
Date
November 26, 2012
Version
ZK 6.0 and later

Introduction

Web application developers often require to transform data into different format. For instance, to PDF format that enhance read accessibility and to Excel format that can further analyze data. This smalltalk is going to introduce a easy way that can transform from Grid or Listbox to PDF/Excel.

Demo

Grid/Listbox
Export Grid or Listbox to PDF or Excel demo.png

PDF
Export Grid or Listbox to PDF or Excel PDF Format.png

Excel
Export Grid or Listbox to PDF or Excel Excel Format.png

Usage

Export Listbox/Grid

As you can see the following sample code, export Listbox/Grid to PDF or Excel is quite straightforward.

PDF

	@Command
	public void exportGrid(@BindingParam("ref") Grid grid) throws Exception {
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		
		PdfExporter exporter = new PdfExporter();
		exporter.export(grid, out);
		
		AMedia amedia = new AMedia("FirstReport.pdf", "pdf", "application/pdf", out.toByteArray());
		Filedownload.save(amedia);		
		out.close();
	}

Excel

	@Command
	public void exportListboxToExcel(@BindingParam("ref") Listbox listbox) throws Exception {
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		
		ExcelExporter exporter = new ExcelExporter();
		exporter.export(listbox, out);
		
		AMedia amedia = new AMedia("FirstReport.xlsx", "xls", "application/file", out.toByteArray());
		Filedownload.save(amedia);
		out.close();
	}

Export data by Renderer

Although export Listbox/Grid to PDF or Excel is quite straightforward. However, it does have some limitation. For instance, it cannot export full contents with Grid/Listbox ROD enabled. In such use case, you can use renderer to render raw data to PDF/Excel directly. Another advantage of renderer is that you can highly customize the rendering result.

PDF

ZK Exporter leverage the famous iText library to create PDF documents. Renderer will use iText API directly.

  • Render header using Interceptor.beforeRendering API
		final PdfExporter exporter = new PdfExporter();
		final PdfPCellFactory cellFactory = exporter.getPdfPCellFactory();
		final FontFactory fontFactory = exporter.getFontFactory();
		
		final String[] headers = new String[]{"Name", "Top Nutrients", "% of Daily", "Calories", "Quantity"};
		exporter.setInterceptor(new Interceptor <PdfPTable> () {
			
			@Override
			public void beforeRendering(PdfPTable table) {
				for (int i = 0; i < headers.length; i++) {
					String header = headers[i];
					Font font = fontFactory.getFont(FontFactory.FONT_TYPE_HEADER);
					
					PdfPCell cell = cellFactory.getHeaderCell();
					cell.setPhrase(new Phrase(header, font));
					if ("% of Daily".equals(header) || "Calories".equals(header)) {
						cell.setHorizontalAlignment(Element.ALIGN_CENTER);
					}
					table.addCell(cell);
				}
				table.completeRow();
			}
			
			@Override
			public void afterRendering(PdfPTable table) {
			}
		});
  • Render contents using GroupRenderer
		exporter.export(headers.length, _model.getData(), new GroupRenderer<PdfPTable, Food>() {

			@Override
			public void render(PdfPTable table, Food food, boolean isOddRow) {
				Font font = fontFactory.getFont(FontFactory.FONT_TYPE_CELL);

				PdfPCell cell = cellFactory.getCell(isOddRow);
				cell.setPhrase(new Phrase(food.getName(), font));
				table.addCell(cell);
				
				cell = cellFactory.getCell(isOddRow);
				cell.setPhrase(new Phrase(food.getTopNutrients(), font));
				table.addCell(cell);
				
				cell = cellFactory.getCell(isOddRow);
				cell.setPhrase(new Phrase("" + food.getDailyPercent(), font));
				cell.setHorizontalAlignment(Element.ALIGN_CENTER);
				table.addCell(cell);
				
				cell = cellFactory.getCell(isOddRow);
				cell.setPhrase(new Phrase("" + food.getCalories(), font));
				cell.setHorizontalAlignment(Element.ALIGN_CENTER);
				table.addCell(cell);
				
				cell = cellFactory.getCell(isOddRow);
				cell.setPhrase(new Phrase(food.getQuantity(), font));
				table.addCell(cell);
				
				table.completeRow();
			}

			@Override
			public void renderGroup(PdfPTable table, Collection<Food> foods) {
				Iterator<Food> iterator = foods.iterator();
				if (iterator.hasNext()) {
					Food food = iterator.next();
					Font font = fontFactory.getFont(FontFactory.FONT_TYPE_GROUP);
					PdfPCell cell = cellFactory.getGroupCell();
					
					cell.setPhrase(new Phrase(food.getCategory(), font));
					cell.setColspan(headers.length);
					table.addCell(cell);
					
					table.completeRow();
				}
			}

			@Override
			public void renderGroupfoot(PdfPTable table, Collection<Food> foods) {
				Font font = fontFactory.getFont(FontFactory.FONT_TYPE_GROUPFOOT);
				PdfPCell cell = cellFactory.getGroupCell();
				cell.setPhrase(new Phrase("Total size: " + (foods != null ? foods.size() : 0), font));
				table.addCell(cell);
				
				cell = cellFactory.getCell(false);
				cell.setColspan(headers.length - 1);
				table.addCell(cell);
				table.completeRow();
			}
		}, out);

Excel

Summary

Download

  • The demo web application can be downloaded here - Github
  • The export.jar can be downloaded here- Github


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