Primefaces DataExporter 设置表格列宽 [英] Primefaces DataExporter Set Table Columns Width

问题描述

我有一个使用 Primefaces DataExporter 导出的 Primefaces DataGrid，但我不知道如何调整列的大小.

我添加了一个预处理器

<p:dataExporter type="pdf" target="tbl" fileName="cars" preProcessor="#{customizedDocumentsView.preProcessPDF}"/>

这是我的 bean 中的代码

public void preProcessPDF(Object document) {文档 pdf = (Document) 文档；pdf.open();pdf.setPageSize(PageSize.A4);//我需要做类似的事情//PdfPTable table = new PdfPTable(4);//float[] columnWidths = new float[] {10f, 20f, 30f, 10f};//table.setWidths(columnWidths);}

有没有办法做到这一点?

解决方案

最近我继承了许多已经存在的exporters 并且已经设置了options 标签的项目，所以我需要找到将保持所有这些完整的解决方案.

我从这个接受的

扩展此解决方案的建议:

Primefaces 导出器使用 iText 2.1.7 版.使用旧但仍然强大的 API.例如，在步骤 1 的 ExporterOptions 中，您可以添加

public int[] getColumnWidths();

设置绝对列宽或者您可以设置由您的项目要求驱动的任何其他选项.

I have a Primefaces DataGrid that I export whith Primefaces DataExporter but I can't figure out how to resize the columns.

I added a preporcessor

<p:dataExporter type="pdf" target="tbl" fileName="cars" preProcessor="#{customizedDocumentsView.preProcessPDF}" />

And this is the code in my bean

public void preProcessPDF(Object document) {
        Document pdf = (Document) document;
        pdf.open();
        pdf.setPageSize(PageSize.A4);

        //I need to do something like that
        //PdfPTable table = new PdfPTable(4);
        //float[] columnWidths = new float[] {10f, 20f, 30f, 10f};
        //table.setWidths(columnWidths);
    } 

Is there any way to do this ?

解决方案

Recently I inherited project with many already existing exporters with already set options tags so I needed to find solution that will keep all of them intact.

I got an idea from this accepted answer.

My solution sets column widths via options tag of p:dataExporter so there is no need for pre/post processing. I tested it using Primefaces ver 4.x and up.

Step by step procedure:

1. Create new package org.primefaces.component.export inside your project.

2. From Primefaces git repository fully copy following classes ExporterOptions ,PDFOptions, Exportedfactory and PDFExporter into newly created package.

3. In ExporterOptions add public float[] getColumnWidths();

4. In PDFOptions add float[] columnWidths; and add getter and setter.

5. In ExporterFactory modify line exporter = new PdfExporter(); to exporter = new CustomPdfExporter();

6. Rename PDFExporter class to CustomPDFExporter and keep just following export method fully

   public void export(FacesContext context, DataTable table, String filename, boolean pageOnly, boolean selectionOnly, String encodingType,MethodExpression preProcessor, MethodExpression postProcessor, ExporterOptions options) throws IOException
   

Delete code from other export methods but keep declarations.

7. Inside CustomPDFExporter add 2 lines in ExportPdfTable method

   protected PdfPTable exportPDFTable(FacesContext context, DataTable table, boolean pageOnly, boolean selectionOnly, String encoding) throws DocumentException {
      int columnsCount = getColumnsCount(table);
      PdfPTable pdfTable = new PdfPTable(columnsCount);
      this.cellFont = FontFactory.getFont(FontFactory.TIMES, encoding);
      this.facetFont = FontFactory.getFont(FontFactory.TIMES, encoding, Font.DEFAULTSIZE, Font.BOLD);
   
       if (this.expOptions != null) {
           applyFacetOptions(this.expOptions);
           applyCellOptions(this.expOptions);
           //line 1
           //sets columns column relative widths to iText PdfTable object
           pdfTable.setWidths(this.expOptions.getColumnWidths());
           //line 2
           //decreases page margins comparing to original 'Primefaces' layout
           pdfTable.setWidthPercentage(100);
       }
   
       //....
   

   }

8. Now you are ready to go managed bean and add pdf option. For example

   pdfOpt = new PDFOptions(); //add getter and setter too
   pdfOpt.setFacetBgColor("#F88017");
   ...
   //if, for example, your PDF table has 4 columns
   //1st column will occupy 10% of table's horizontal width,...3rd - 20%, 4th - 60% 
   float[] columnWidths = new float[]{0.1f, 0.1f, 0.2f, 0.6f};
   pdfOpt.setColumnWidths(columnWidths);
   ...
   

9. Finally your p:dataExporter component should look like this

   <p:dataExporter type="pdf" target="tbl" fileName="cars" options="#{customizedDocumentsView.pdfOpt}"/>
   

This solution using PF showcase produces following result

Suggestion for extending this solution:

Primefaces exporter uses iText ver 2.1.7. with old but still powerful API. For example, in ExporterOptions in step 1. you can add

public int[] getColumnWidths();

to set absolute column widths or you can set any other option driven by your project requirements.

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