The maximum number of cell styles was exceeded. You can define up to 4000 styles



The maximum number of cell styles was exceeded. You can define up to 4000 styles错误的解决方法。POI操作Excel中，导出的数据很多或者比较多时，就会报以下的错误，是由于cell styles太多create造成，可以把cellstyle设置放到循环外面解决问题。

报错如下：

Caused by: java.lang.IllegalStateException: The maximum number of cell styles was exceeded. You can define up to 4000 styles in a .xls workbook
at org.apache.poi.hssf.usermodel.HSSFWorkbook.createCellStyle(HSSFWorkbook.java:1144)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.createCellStyle(HSSFWorkbook.java:88)
at com.trendmicro.util.toExcel.ExcelExporter.addWorkbook(ExcelExporter.java:612)
at com.trendmicro.util.toExcel.ExcelExporter.exportToExcel(ExcelExporter.java:112)
at com.trendmicro.util.toExcel.ReportExporter.exportAutomationReport(ReportExporter.java:190)
at com.trendmicro.view.reports.TestCaseAutomationBean.exportAutoReport(TestCaseAutomationBean.java:856)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.el.parser.AstValue.invoke(AstValue.java:191)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
at org.apache.jasper.el.JspMethodExpression.invoke(JspMethodExpression.java:68)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
… 33 more

————-示例————–

错误示例：

  1. for (int i = 0; i < 10000; i++) {
  2.     Row row = sheet.createRow(i);
  3.     Cell cell = row.createCell((short) 0);
  4.     CellStyle style = workbook.createCellStyle();
  5.     Font font = workbook.createFont();
  6.     font.setBoldweight(Font.BOLDWEIGHT_BOLD);
  7.     style.setFont(font);
  8.     cell.setCellStyle(style);
  9. }

 

改正后正确代码

  1. CellStyle style = workbook.createCellStyle();
  2. Font font = workbook.createFont();
  3. font.setBoldweight(Font.BOLDWEIGHT_BOLD);
  4. style.setFont(font);
  5. for (int i = 0; i < 10000; i++) {
  6.     Row row = sheet.createRow(i);
  7.     Cell cell = row.createCell((short) 0);
  8.     cell.setCellStyle(style);
  9. }

以上方法原地址：http://blog.csdn.net/hoking_in/article/details/7919530
方法二(不推荐，影响性能)：

1.4000最大样式错误


java.lang.IllegalStateException: The maximum number of cell styles was exceeded. You can define up to 4000 styles in a .xls workbook错误

找到zpoi.jar中org.zkoss.poi.hssf.usermodel.HSSFWorkbook修改createCellStyle函数内的最大样式数量即可。重新打zpoi.jar即可。

 

  1. public HSSFCellStyle createCellStyle()
  1. {
  2.     if(workbook.getNumExFormats() == MAX_STYLES) {
  3.         throw new IllegalStateException(“The maximum number of cell styles was exceeded. ” +
  4.                 ”You can define up to 4000 styles in a .xls workbook”);
  5.     }
  6.     ExtendedFormatRecord xfr = workbook.createCellXF();
  7.     short index = (short) (getNumCellStyles() - 1);
  8.     HSSFCellStyle style = new HSSFCellStyle(index, xfr, this);
  9.     workbook.createCellXFExt(index);
  10.     return style;
  11. }

 

IE兼容问题

如果IE系列的浏览器出现了兼容问题（具体就是显示不出报表来），我已知的可能出现的问题有，Excel模板里有数字已字符串形式写入，或者是写日期格式的单元格出现了写入错误。具体的解决如下。

数字形式写入代码

  1. public static Cell writeNumericValue(Sheet sheet, int row, int column,
  2.         Double value) {
  3.     Row poiRow = sheet.getRow(row);
  4.     if (poiRow == null) {
  5.         poiRow = sheet.createRow(row);
  6.     }
  7.     Cell poiCell = poiRow.getCell(column);
  9.     if (poiCell != null) {
  10.         poiRow.removeCell(poiCell);
  11.     }
  12.     poiCell = poiRow.createCell(column);
  13.     poiCell.setCellType(Cell.CELL_TYPE_NUMERIC);
  14.     poiCell.setCellValue(value);
  15.     return poiCell;
  16. }

写入日期代码

  1. public static Cell writeDateValue(Workbook book, Sheet sheet, int row,
  2.         int column, Date value) {
  3.     Row poiRow = sheet.getRow(row);
  4.     CreationHelper createHelper = book.getCreationHelper();
  5.     if (poiRow == null) {
  6.         poiRow = sheet.createRow(row);
  7.     }
  8.     Cell poiCell = poiRow.getCell(column);
  10.     if (poiCell == null) {
  11.         poiCell = poiRow.createCell(column);
  12.     }
  14.     CellStyle cellStyle = book.createCellStyle();
  15.     cellStyle.setDataFormat(createHelper.createDataFormat().getFormat(
  16.             ”yyyy-mm-dd”));
  17.     if (value != null) {
  18.         poiCell.setCellValue(value);
  19.     } else {
  20.         poiCell.setCellValue(new Date());
  21.     }
  22.     poiCell.setCellStyle(cellStyle);
  24.     return poiCell;
  25. }

 以上方法原地址：http://realgodo.iteye.com/blog/1105529