[英]Cannot get a NUMERIC value from a STRING cell with POI
要使用POI和Java从excel文件中读取列,请执行以下操作:
package main;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
public class ReadExcel {
public static void main(String[] args) {
try {
InputStream fs = new FileInputStream("/.../ListProducts.xls");
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
Map<String, Integer> map = new HashMap<String,Integer>(); //Create map
HSSFRow row = sheet.getRow(0); //Get first row
//following is boilerplate from the java doc
short minColIx = row.getFirstCellNum(); //get the first column index for a row
short maxColIx = row.getLastCellNum(); //get the last column index for a row
for(short colIx=minColIx; colIx<maxColIx; colIx++) { //loop from first to last index
HSSFCell cell = row.getCell(colIx); //get the cell
map.put(cell.getStringCellValue(),cell.getColumnIndex()); //add the cell contents (name of column) and cell index to the map
}
List<ReportRow> listOfDataFromReport = new ArrayList<ReportRow>();
for(int x = 1; x<=sheet.getPhysicalNumberOfRows(); x++){
ReportRow rr = new ReportRow();
HSSFRow dataRow = sheet.getRow(x);
int idxForColumn1 = map.get("Id");
int idxForColumn2 = map.get("Name");
int idxForColumn3 = map.get("Price");
HSSFCell cell1 = dataRow.getCell(idxForColumn1);
HSSFCell cell2 = dataRow.getCell(idxForColumn2);
HSSFCell cell3 = dataRow.getCell(idxForColumn3);
rr.setColumn1(cell1.getNumericCellValue());
rr.setColumn2(cell2.getNumericCellValue());
rr.setColumn3(cell3.getNumericCellValue());
listOfDataFromReport.add(rr);
}
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
我注意到setColumn1,setColumn2,setColumn3
方法的变量是double
。
当我尝试运行程序以读取数据时,出现以下错误:
Exception in thread "main" java.lang.IllegalStateException: Cannot get a NUMERIC value from a STRING cell
at org.apache.poi.hssf.usermodel.HSSFCell.typeMismatch(HSSFCell.java:654)
at org.apache.poi.hssf.usermodel.HSSFCell.getNumericCellValue(HSSFCell.java:679)
请提出任何建议,我在excel文件中的所有单元格都带有数字类型...
您要做的是使用DataFormatter类。 您为此传递一个单元格,它会尽力返回一个字符串,其中包含Excel将对该单元格显示的内容。 如果将字符串单元格传递给它,则将字符串取回。 如果您向其传递一个应用了格式设置规则的数字单元格,它将根据它们格式化数字并返回字符串。
对于您的情况,如果您要求DataFormatter格式化这些单元格,它将返回一个带有双精度字符串的字符串。
尝试使用
DataFormatter formatter = new DataFormatter();
String str = formatter.formatCellValue(cell1);
double dnum = Double.parseDouble(str );
System.out.println("In formated Cell Value--" + dnum);
rr.setColumn1(dnum);
要获取更多参考,请看一下这些链接,我认为它将对您有所帮助。 http://massapi.com/class/da/DataFormatter.html
如果确定3个值是数字,则可以在读取之前修改它的类型:
HSSFCell cell1 = dataRow.getCell(idxForColumn1);
HSSFCell cell2 = dataRow.getCell(idxForColumn2);
HSSFCell cell3 = dataRow.getCell(idxForColumn3);
cell1.setCellType(CellType.NUMERIC);
cell2.setCellType(CellType.NUMERIC);
cell3.setCellType(CellType.NUMERIC);
rr.setColumn1(cell1.getNumericCellValue());
rr.setColumn2(cell2.getNumericCellValue());
rr.setColumn3(cell3.getNumericCellValue());
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