POI 导出excel 时Cannot get a error value from a numeric cell解决办法

POI 导出excel 时Cannot get a error value from a numeric cell

java.lang.IllegalStateException: Cannot get a error value from a numeric cell
	at org.apache.poi.xssf.streaming.SXSSFCell.typeMismatch(SXSSFCell.java:845)
	at org.apache.poi.xssf.streaming.SXSSFCell.getErrorCellValue(SXSSFCell.java:487)
	at org.apache.poi.xssf.streaming.SXSSFCell.convertCellValueToString(SXSSFCell.java:895)
	at org.apache.poi.xssf.streaming.SXSSFCell.setType(SXSSFCell.java:764)
	at org.apache.poi.xssf.streaming.SXSSFCell.ensureType(SXSSFCell.java:721)
	at org.apache.poi.xssf.streaming.SXSSFCell.setCellType(SXSSFCell.java:106)
	at com.zx.common.utils.msoffice.NewExcelHandle$StyleUtil.setCellValue(NewExcelHandle.java:222)
	at com.zx.common.utils.msoffice.NewExcelHandle$StyleUtil.setCellBorder(NewExcelHandle.java:456)
	at com.zx.outstock.service.OutStockService.WriteExcelFirstOutStockPhone(OutStockService.java:346)
	at com.zx.outstock.service.OutStockService.expAllLedgerDo(OutStockService.java:1495)
	at com.zx.outstock.service.OutStockService$$FastClassByCGLIB$$2fa33f31.invoke(<generated>)
	at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191)
	at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:700)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:635)
	at com.zx.outstock.service.OutStockService$$EnhancerByCGLIB$$fbba495b.expAllLedgerDo(<generated>)

用Poi的SXXFWorkbook导出excel2007的时候报的错，谁遇见过这个错误
------解决方案--------------------
应该是格子里是数字类型，但是没用数字类型去取

switch (cell.getCellType()) {
    		case Cell.CELL_TYPE_BLANK:
    			ret = "";
    			break;
    		case Cell.CELL_TYPE_BOOLEAN:
    			ret = String.valueOf(cell.getBooleanCellValue());
    			break;
    		case Cell.CELL_TYPE_ERROR:
    			ret = null;
    			break;
    		case Cell.CELL_TYPE_FORMULA:
    			Workbook wb = cell.getSheet().getWorkbook();
    			CreationHelper crateHelper = wb.getCreationHelper();
    			FormulaEvaluator evaluator = crateHelper.createFormulaEvaluator();
    			ret = getCellValue(evaluator.evaluateInCell(cell));
    			break;
    		case Cell.CELL_TYPE_NUMERIC:
    			if (DateUtil.isCellDateFormatted(cell)) { 
    				Date theDate = cell.getDateCellValue();
    				ret = simpleDateFormat.format(theDate);
    			} else { 
    				ret = NumberToTextConverter.toText(cell.getNumericCellValue());
    			}
    			break;
    		case Cell.CELL_TYPE_STRING:
    			ret = cell.getRichStringCellValue().getString();
    			break;
    		default:
    			ret = null;
    		}

这样试试
------解决方案--------------------
应该是类型问题。debug 看看数据。。
------解决方案--------------------
类型不正确，你应该先判断类型，再取值。