将Excel日期数据保存到MySQL时Java Date Formatter不起作用

Question

My goal is to save every rows of data in excel into MySQL database. In my excel file, the date format is dd.MM.yyyy, whereas yyyy-MM-dd is the date format in MySQL.

Here are my codes:

import java.io.FileInputStream;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelReader {

    public static void main(String[] args) throws Exception {

        try {

            Class.forName("com.mysql.jdbc.Driver");
            Connection con = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/activity", "root", "password");
            con.setAutoCommit(false);
            PreparedStatement pstm = null ;
            FileInputStream input = new FileInputStream("testing.xlsx");
            //POIFSFileSystem fs = new POIFSFileSystem( input );
            XSSFWorkbook wb = new XSSFWorkbook(input);
            XSSFSheet sheet = wb.getSheetAt(0);
            Row row;
            for(int i=1; i<=sheet.getLastRowNum(); i++){
                row = sheet.getRow(i);
                String activityName= row.getCell(5).getStringCellValue();
                Integer activityAllocation = (int) row.getCell(8).getNumericCellValue();
                //DataFormatter dataFormatter = new DataFormatter();
                //String activityDate = dataFormatter.formatCellValue(row.getCell(10));
                Date activityDate = row.getCell(10).getDateCellValue();                
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                String Date = sdf.format(activityDate);
                String activityPersonInCharge = row.getCell(11).getStringCellValue();

                String sql = "INSERT INTO activity(ACTIVITY_NAME,ACTIVITY_ALLOCATION,ACTIVITY_DATE,ACTIVITY_MADE_BY) VALUES('"+activityName+"','"+activityAllocation +"','"+activityDate +"','"+activityPersonInCharge +"')";
                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 (IOException e) {
            e.printStackTrace();
        }
    }

}

I tried to format the date of the excel cell but failed to work. The exception:

Exception in thread "main" java.lang.IllegalStateException: Cannot get a NUMERIC value from a STRING cell
    at org.apache.poi.xssf.usermodel.XSSFCell.typeMismatch(XSSFCell.java:1062)
    at org.apache.poi.xssf.usermodel.XSSFCell.getNumericCellValue(XSSFCell.java:307)
    at org.apache.poi.xssf.usermodel.XSSFCell.getDateCellValue(XSSFCell.java:776)
    at ExcelReader.main(ExcelReader.java:35)

Which part of the codes that I did wrongly? Also, if I use the commented line of codes for the date formatter, no exception shown but it save the wrong dates. Please guide me. Thanks in advance

Answer 1

Get the value as a String

String activityDate = row.getCell(10).getStringCellValue();                

According to you the format is 19.06.2014

so

SimpleDateFormat sdf = new SimpleDateFormat("dd.MM.yyyy");

then parse it into a Date

Date dt = sdf.parse(activityDate);

Use PreparedStatment to insert

Set the value (column 3 ?)

ps.setDate (3, dt);