Excel Results Table (* .xlsx) using Apache POI

Question

I am trying to write a ResultSet table in Excel (* .xlsx) using Apache Poi.

Invalid table object error in Office Excel

However, despite the fact that he writes the Excel file without any errors, when I try to open it in Office Excel 2013, it shows an error and deletes the table object to provide only a simple view of the data.

Here is an example of sample code in this example :

public static void writeExcel(ResultSet rs, int sqliteRowCount, String dir) { System.out.println("Writing Excel(*.xlsx) File..."); XSSFWorkbook workbook = null; try { if (rs != null) { // Get ResultSet MetaData ResultSetMetaData rsmd = rs.getMetaData(); // Number of columns int numColumns = rsmd.getColumnCount(); // Number of rows // + 1 for headers int numRows = sqliteRowCount + 1; workbook = new XSSFWorkbook(); // Create Excel Table XSSFSheet sheet = workbook.createSheet("Text"); XSSFTable table = sheet.createTable(); table.setDisplayName("Test"); CTTable cttable; cttable = table.getCTTable(); // Style configurations CTTableStyleInfo style = cttable.addNewTableStyleInfo(); style.setName("TableStyleMedium16"); style.setShowColumnStripes(false); style.setShowRowStripes(true); // Set Table Span Area AreaReference reference = new AreaReference(new CellReference(0, 0), new CellReference(numRows - 1, numColumns - 1)); cttable.setRef(reference.formatAsString()); cttable.setId(1); cttable.setName("Test"); cttable.setDisplayName("Test"); cttable.setTotalsRowCount(numRows); cttable.setTotalsRowShown(false); // Create Columns CTTableColumns columns = cttable.addNewTableColumns(); columns.setCount(numColumns); // Create Column, Row, Cell Objects CTTableColumn column; XSSFRow row; // Add Header and Columns XSSFRow headerRow = sheet.createRow(0); for (int i = 0; i < numColumns; i++) { column = columns.addNewTableColumn(); column.setName("Column" + (i + 1)); column.setId(i + 1); headerRow.createCell(i).setCellValue(rsmd.getColumnLabel(i + 1)); } // Write each row from ResultSet int rowNumber = 1; while (rs.next()) { row = sheet.createRow(rowNumber); for (int y = 0; y < numColumns; y++) { row.createCell(y).setCellValue(rs.getString(y + 1)); } rowNumber++; } // Set AutoFilter CTAutoFilter fltr = CTAutoFilter.Factory.newInstance(); fltr.setRef((new AreaReference(new CellReference(0, 0), new CellReference(numRows - 1, numColumns - 1))).formatAsString()); cttable.setAutoFilter(fltr); // sheet.setAutoFilter(CellRangeAddress.valueOf((new AreaReference(new CellReference(0, 0), new CellReference(numRows - 1, numColumns - 1))).formatAsString())); // Freeze Pan sheet.createFreezePane(0, 1, 0, 2); } } catch (SQLException ex) { System.out.println("SQL Error while writing Excel file!"); } finally { try { // Let write the excel file now if (workbook != null) { String excelDir = dir + File.separator + "workbook.xlsx"; try (final FileOutputStream out = new FileOutputStream(excelDir)) { workbook.write(out); } } } catch (IOException ex) { System.out.println("IO Error while writing Excel summary file!"); } } } 

I know that something is wrong with my code, but I can not figure it out. Any idea why this is happening, where there will be a potential error in my code.

Update 1:

Table of XML file in Excel archive, if created using Apache POI

 <?xml version="1.0" encoding="UTF-8"?> <table displayName="Test" ref="A1:B881" id="1" name="Test" totalsRowCount="881" xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" totalsRowShown="0"><autoFilter ref="A1:B881"/><tableColumns count="2"><tableColumn name="ID" id="1"/><tableColumn name="Name" id="2"/><tableStyleInfo name="TableStyleMedium2" showColumnStripes="true" showRowStripes="true"/></table> 

The table of the XML file in the Excel archive, if the table is created manually

 <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <table xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" id="1" name="Table1" displayName="Table1" ref="A1:B881" totalsRowShown="0"><autoFilter ref="A1:B881"/><tableColumns count="2"><tableColumn id="1" name="ID"/><tableColumn id="2" name="Name"/></tableColumns><tableStyleInfo name="TableStyleLight9" showFirstColumn="0" showLastColumn="0" showRowStripes="1" showColumnStripes="0"/></table> 

In addition, if I open the Excel archive, it does not have a folder with a theme created by Apache POI, but it is present in the one that is created manually in Office Excel. It’s strange.

Update 2: Example executable code (using Netbeans):

 /* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package apachepoi_exceltest; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.HashMap; import java.util.Map; import org.apache.poi.ss.util.AreaReference; import org.apache.poi.ss.util.CellRangeAddress; import org.apache.poi.ss.util.CellReference; import org.apache.poi.xssf.usermodel.XSSFRow; import org.apache.poi.xssf.usermodel.XSSFSheet; import org.apache.poi.xssf.usermodel.XSSFTable; import org.apache.poi.xssf.usermodel.XSSFWorkbook; import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTable; import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableColumn; import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableColumns; import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableStyleInfo; /** * */ public class ApachePOI_ExcelTest { /** * @param args the command line arguments */ public static void main(String[] args) { String outputDir = "Your Local Directory Here"; // TODO code application logic here HashMap<String, String> dataMap = new HashMap<>(); dataMap.put("ID 1", "Dummy Name 1"); dataMap.put("ID 2", "Dummy Name 2"); dataMap.put("ID 3", "Dummy Name 3"); dataMap.put("ID 4", "Dummy Name 4"); writeExcel(dataMap, outputDir); } private static void writeExcel(HashMap<String, String> dataMap, String outputDir) { System.out.println("Writing Excel(*.xlsx) Summary File..."); XSSFWorkbook workbook = null; try { // Number of columns int numColumns = 2; // ID and Name // Number of rows int numRows = dataMap.size() + 1; // +1 for header // Create Workbook workbook = new XSSFWorkbook(); // Create Excel Table XSSFSheet sheet = workbook.createSheet("Summary"); XSSFTable table = sheet.createTable(); table.setDisplayName("Test"); CTTable cttable; cttable = table.getCTTable(); // Style configurations CTTableStyleInfo style = cttable.addNewTableStyleInfo(); style.setName("TableStyleMedium16"); style.setShowColumnStripes(false); style.setShowRowStripes(true); // Set Tabel Span Area AreaReference reference = new AreaReference(new CellReference(0, 0), new CellReference(numRows - 1, numColumns - 1)); cttable.setRef(reference.formatAsString()); cttable.setId(1); cttable.setName("Test"); cttable.setDisplayName("Test"); cttable.setTotalsRowCount(numRows); cttable.setTotalsRowShown(false); // Create Columns CTTableColumns columns = cttable.addNewTableColumns(); columns.setCount(numColumns); // Create Column, Row, Cell Objects CTTableColumn column; XSSFRow row; // Add ID Header column = columns.addNewTableColumn(); column.setName("Column" + (1)); column.setId(1); // Add Name Header column = columns.addNewTableColumn(); column.setName("Column" + (1)); column.setId(1); // Add Header Row XSSFRow headerRow = sheet.createRow(0); headerRow.createCell(0).setCellValue("ID"); headerRow.createCell(1).setCellValue("Name"); int rowNumber = 1; for (Map.Entry<String, String> entry : dataMap.entrySet()) { String id = entry.getKey(); String name = entry.getValue(); row = sheet.createRow(rowNumber); row.createCell(0).setCellValue(id); row.createCell(1).setCellValue(name); rowNumber++; } // Set Filter (Below three lines code somehow not working in this example, so setting AutoFilter to WorkSheet) // CTAutoFilter fltr = CTAutoFilter.Factory.newInstance(); // fltr.setRef((new AreaReference(new CellReference(0, 0), new CellReference(numRows - 1, numColumns - 1))).formatAsString()); // cttable.setAutoFilter(fltr); sheet.setAutoFilter(CellRangeAddress.valueOf((new AreaReference(new CellReference(0, 0), new CellReference(numRows - 1, numColumns - 1))).formatAsString())); // Freeze First Row as header Row sheet.createFreezePane(0, 1, 0, 2); } catch (Exception ex) { System.out.println("Error while writing Excel summary file!"); } finally { try { // Lets write the Excel File Now if (workbook != null) { String excelDir = outputDir + File.separator + "workbook.xlsx"; try (final FileOutputStream out = new FileOutputStream(excelDir)) { workbook.write(out); } } } catch (IOException ex) { System.out.println("IO Error while writing Excel summary file!"); } } } } 

Used libraries:

OOXML Schemas-1.1.jar

poi-3.11-beta2-20140822.jar

poi-OOXML-3,11-beta2-20140822.jar

XMLBeans-2.6.0.jar

Answer 1

What is wrong with your code is the presence of one line. "cttable.setTotalsRowCount (NumRows);" Remove it and everything will work. When in doubt, compare the XML definitions of some manually created worksheet in Excel with those created using Apache POI

Answer 2

I had the same problem.

Digging deeply, I found that for some XML data, tables in XLSX package Excel changes one > to > after performing repairs. XML from a POI makes sense (use < and > to surround XML elements), so I have no idea why Microsoft decides to break it.

If it would be the same case for you, I would not worry too much about it.

If you want to know if you have this particular difference:

• Create XLSX with POI
• Restore XLSX with Excel and save to a new file
• Open both files with a ZIP editor (e.g. 7Zip)
• Find xl / tables / table1.xml
• Export both XML files (restore POI and Excel)
• Reset files

Answer 3

You did not create your table correctly. Check:

• Have you created header columns in cttable?
• Did you create the same header columns through cell.setCellValue?

• Delete blank first header column (POI BUG) at the end

  CTTable () getTableColumns () removeTableColumn (0); ..

Put the debug in XSSFTable.class, the updateHeaders () method.

If your table is not created properly,

 XSSFRow row = sheet.getRow(headerRow); 

will be null in

 /** * Synchronize table headers with cell values in the parent sheet. * Headers <em>must</em> be in sync, otherwise Excel will display a * "Found unreadable content" message on startup. */ @SuppressWarnings("deprecation") public void updateHeaders(){ XSSFSheet sheet = (XSSFSheet)getParent(); CellReference ref = getStartCellReference(); if(ref == null) return; int headerRow = ref.getRow(); int firstHeaderColumn = ref.getCol(); XSSFRow row = sheet.getRow(headerRow); if (row != null && row.getCTRow().validate()) { int cellnum = firstHeaderColumn; for (CTTableColumn col : getCTTable().getTableColumns().getTableColumnArray()) { XSSFCell cell = row.getCell(cellnum); if (cell != null) { col.setName(cell.getStringCellValue()); } cellnum++; } } }