Question

我正在尝试将xls文件导入mysql，但收到错误Nullpointer EXCEPTION请给我解决方案

package abhi;

public class ImportData {

/**
 * @param args
 */
public static void main(String[] args) {
    // TODO Auto-generated method stub

    try{
        Class.forName("com.mysql.jdbc.Driver");  
        Connection con = (Connection) DriverManager.getConnection("jdbc:mysql://localhost/test","root","abhi1402");  
        con.setAutoCommit(false);  
        PreparedStatement pstm = null ;  
        FileInputStream input = new FileInputStream("D:/New Folder/apnakhata1.xls");  
        POIFSFileSystem fs = new POIFSFileSystem( input );  
        HSSFWorkbook wb = new HSSFWorkbook(fs);  
        HSSFSheet sheet = wb.getSheetAt(0);  
        Row row;
        for(int i=1; i<=sheet.getLastRowNum(); i++){
            row = sheet.getRow(i);
            String CountryName = row.getCell(1).getStringCellValue();
            String CountryCode = row.getCell(2).getStringCellValue();
            String BankName = row.getCell(3).getStringCellValue();
            String Website = row.getCell(4).getStringCellValue();
            String Name = row.getCell(5).getStringCellValue();
            String SMS = row.getCell(6).getStringCellValue();
            int SMSNumber = (int) row.getCell(7).getNumericCellValue();
            int CustomerCare = (int) row.getCell(8).getNumericCellValue();

String sql = "INSERT INTO Bank VALUES('"+CountryName+"','"+CountryCode

+"','"+BankName+"','"+Website+"','"+Name+"','"+SMS+"','"+SMSNumber

+"','"+CustomerCare+"')";

            pstm = (PreparedStatement) con.prepareStatement(sql);
            pstm.execute();
            System.out.println("Import rows "+i);
        }
        con.commit();
        pstm.close();
        con.close();
        input.close();
        System.out.println("Success import excel to mysql table");
    }catch(ClassNotFoundException e){
        System.out.println(e);
    }catch(SQLException ex){
        System.out.println(ex);
    }catch(IOException ioe){
        System.out.println(ioe);
    }

}

}


}

}

Answer 1

您的代码中NullPointerException的原因归于

for(int i=1; i<=sheet.getLastRowNum(); i++)

检查您的Excel文件。它可能包含一些空白行或可能是一些空白列值，然后运行您的代码。

Answer 2

你必须把

String CountryName = row.getCell(0).getStringCellValue();
String CountryCode = row.getCell(1).getStringCellValue();
String BankName = row.getCell(2).getStringCellValue();
String Website = row.getCell(3).getStringCellValue();
String Name = row.getCell(4).getStringCellValue();

用于将xls数据导入mysql数据库的java代码

2 个答案: