检查Apache POI库中的单元格为空

Question

我是uisng Java Apache POI库。在这里，我想检查给定的单元格是否为空或不在下面的方法（getExcelContent）中。我如何检查？

public String getExcellContent(String sheetName, int row, int col){  
    String data = null; 
    sheet1    = wb.getSheet(sheetName);  
    int getType = sheet1.getRow(row).getCell(col).getCellType(); 
    if(getType == 0) { 
     Double data1 = sheet1.getRow(row).getCell(col).getNumericCellValue(); 
     int x1 = data1.intValue(); 
     data = String.valueOf(x1); 
    } 
    else if(getType == 1) { 
     data = sheet1.getRow(row).getCell(col).getStringCellValue(); 
    }else { 
     data = "Nothing"; 
    } 
    return data;   
} 

如果通过的单元是空的，我得到致命错误，如果我使用getCellType（）（ “INT的getType = sheet1.getRow（行）.getCell（COL）.getCellType（）;”） 。我想在使用getCellType之前检查给定的单元格是否为空。

int getType = sheet1.getRow（row）.getCell（col）.getCellType（）;

请参阅完整代码：

import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.IOException; 

import org.apache.poi.xssf.usermodel.XSSFComment; 
import org.apache.poi.xssf.usermodel.XSSFSheet; 
import org.apache.poi.xssf.usermodel.XSSFWorkbook; 

public class ReadExcellData { 
    XSSFWorkbook wb; 
    XSSFSheet sheet1; 

    public ReadExcellData(String excelPath){   
     try { 
      File src   = new File(excelPath); 
      FileInputStream fis = new FileInputStream(src); 
      wb     = new XSSFWorkbook(fis); 
      sheet1    = wb.getSheet("user"); 
     } catch (FileNotFoundException e) {   
      e.printStackTrace(); 
     } catch (IOException e) {   
      e.printStackTrace(); 
     } 
    } 

    public String getExcellData(String sheetName, int row, int col){   
     sheet1    = wb.getSheet(sheetName); 
     String data = sheet1.getRow(row).getCell(col).getStringCellValue(); 
     return data;   
    } 

    public String getExcellContent(String sheetName, int row, int col){  
     String data = null; 
     sheet1    = wb.getSheet(sheetName);  
     int getType = sheet1.getRow(row).getCell(col).getCellType(); 
     if(getType == 0) { 
      Double data1 = sheet1.getRow(row).getCell(col).getNumericCellValue(); 
      int x1 = data1.intValue(); 
      data = String.valueOf(x1); 
     } 
     else if(getType == 1) { 
      data = sheet1.getRow(row).getCell(col).getStringCellValue(); 
     }else { 
      data = "Nothing"; 
     } 
     return data;   
    } 

    public int getActualDataType(String sheetName, int row, int col){ 
     sheet1    = wb.getSheet(sheetName); 
     int getType = sheet1.getRow(row).getCell(col).getCellType(); 
     return getType; 
    } 

    public Double getExcellNumericData(String sheetName, int row, int col){  
     sheet1    = wb.getSheet(sheetName); 
     double data = sheet1.getRow(row).getCell(col).getNumericCellValue(); 
     return data;   
    } 

    public int getRowCount(String sheetName) { 
     int rowNum = wb.getSheet(sheetName).getLastRowNum(); 
     rowNum = rowNum + 1; 
     return rowNum; 
    } 
} 

请人帮忙。

Answer 1

正如评论所说，你需要创建细胞 &检查其空值。 您可能需要更改getExcelContent方法如下。

public String getExcellContent(String sheetName, int row, int col){  
     String data = null; 
     sheet1 = wb.getSheet(sheetName); 
     XSSFCell gcell=null; 
     XSSFRow row1=sheet1.getRow(row);//Create Row. 
     if(row1!=null) 
     { 

     gcell=row1.getCell(col);//Create Cell 
     if(gcell!=null) 
     { 
     int getType = gcell.getCellType(); 
     if(getType == 0) { 
      Double data1 = gcell.getNumericCellValue(); 
      int x1 = data1.intValue(); 
      data = String.valueOf(x1); 
     } 
     else if(getType == 1) { 
      data = gcell.getStringCellValue(); 
     }else { 
      data = "Nothing"; 
     } 
     } 
     } 
     return data;   
    } 

这是为我工作。试一试。