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

POI操作Excel中，导出的数据不是很大时，则不会有问题，而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，故一般可以把cellstyle设置放到循环外面

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

 

 

-------------实例----------------

错误代码：

for (int i = 0; i < 10000; i++) {  
    Row row = sheet.createRow(i);   
    Cell cell = row.createCell((short) 0);   
    CellStyle style = workbook.createCellStyle();  
    Font font = workbook.createFont();   
    font.setBoldweight(Font.BOLDWEIGHT_BOLD);   
    style.setFont(font);   
    cell.setCellStyle(style);  
}  

修改后代码：

CellStyle style = workbook.createCellStyle();  
Font font = workbook.createFont();  
font.setBoldweight(Font.BOLDWEIGHT_BOLD);  
style.setFont(font);  
for (int i = 0; i < 10000; i++) {   
    Row row = sheet.createRow(i);   
    Cell cell = row.createCell((short) 0);   
    cell.setCellStyle(style);  
}