org.apache.poi.hssf之讀取，寫入單元格操作

1.寫入

package test.testcase;

import java.io.*;
import java.util.Date;

import org.apache.poi.hssf.usermodel.*;


/**
 * @Author: zhanglh
 * @Date: 2019/2/13 16:15
 * @Description:
 */
public class CreateWorkbook {

    public static void main(String args[]){
        HSSFWorkbook hssfworkbook=new HSSFWorkbook();
        File file=new File("test.xls");
        if(file.exists()){System.out.println("existing");}
        else
        {
            try
            {
                file.createNewFile();
            }
            catch(IOException e){
                e.printStackTrace();
            }
        }

        try
        {
            HSSFSheet sheet=hssfworkbook.createSheet("time");
            HSSFRow row=sheet.createRow(0);
            HSSFCell cell=row.createCell(0);
            cell.setCellValue(new Date());
            HSSFCell cell1=row.createCell(1);
            cell1.setCellValue("verify");
            FileOutputStream out=new FileOutputStream(file);
            hssfworkbook.write(out);
            out.close();
        }
        catch(IOException e1){
            e1.printStackTrace();
        }


        System.out.println("create xlsx successfully");


        System.out.println("create sheet successfully");
    }

}

 

2.讀出

package test.testcase;

import java.io.*;
import org.apache.poi.hssf.usermodel.*;

/**
 * @Author: zhanglh
 * @Date: 2019/2/13 17:53
 * @Description:
 */
public class OpenWorkbook {
    public  static void main(String args[]) {
        File file = new File("test.xls");
        try {
            FileInputStream input = new FileInputStream(file);
            HSSFWorkbook workbook = new HSSFWorkbook(input);
            HSSFSheet sheet = workbook.getSheetAt(0);
            HSSFRow row = sheet.getRow(0);
            HSSFCell cell = row.getCell(0);
            /*switch (cell.getCellType()) {
                case Cell.CELL_TYPE_NUMERIC:*/
                    System.out.println("cell value:" + cell.getNumericCellValue());


                    //System.out.println("cell value:" + cell.getStringCellValue());


            }
        catch (IOException e) {
            e.printStackTrace();
        }

        if (file.exists()) {
            System.out.println("open");
        } else {
            System.out.println("failure");
        }

        System.out.println("read successfully");
    }
}

output：