Java处理excel根据某列的值查询，并将结果显示在其他列中

package cn.netmis.cmd;

import cn.netmis.cmd.other.Xls;
import cn.netmis.core.util.DBUtils;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.*;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

/**
 * 操作excel表格
 * 读取表格中的工号，同时查询该员工所在部门，填入
 */
public class operExcel {
    private static final String XLS = "xls";
    private static final String XLSX = "xlsx";

    /**
     * 检查文件是否存在
     * 并检查是否是xls或xlsx文件
     * @param file
     * @throws IOException
     */
    public static void checkFile(File file) throws IOException {
        //判断文件是否存在
        if(!file.exists()){
            throw new FileNotFoundException("文件不存在");
        }
        //获取文件名
        String fileName=file.getName();
        //判断文件是否是excel文件
        if (!fileName.endsWith(XLS)&&!fileName.endsWith(XLSX)){
            throw new IOException(fileName+"不是excel文件");
        }
        System.out.println("文件存在且格式正确!");
    }


    /**
     * 获取表格
     * @param file
     * @return
     * @throws IOException
     */
    public static Workbook getWookBook(File file) throws IOException {
        //获取文件名
        String fileName=file.getName();
        //创建Workbook工作簿对象，表示整个excel
        Workbook workbook=null;
        //获取Excel文件的io流
        InputStream is=new FileInputStream(file);
        //根据文件后缀名不同，获得不通的Wookbook实现类对象
        if(fileName.endsWith(XLS)){
            workbook=new HSSFWorkbook(is);

        }else if(fileName.endsWith(XLSX)){
            workbook=new XSSFWorkbook(is);
        }

        return workbook;
    }

    /**
     * 获取一行中所有单元格的内容并存入集合
     * @param file
     * @return
     * @throws IOException
     */
    public static List<String> getTableHanderList(File file,Connection yntv,String filePath,String fileName,Integer statIndex,Integer endIndex) throws IOException, SQLException {
        checkFile(file);
        Workbook wb=getWookBook(file);
        List<String> handList=new ArrayList<>();
        Sheet sheet=wb.getSheetAt(0);
        Row row=null;
        //循环获取所有员工的消费刷卡记录
        //获取到工号并存入集合
        for (int j=statIndex;j<endIndex;j++){
            row=sheet.getRow(j);

            if(row==null){
                return handList;
            }

            Cell cell=row.getCell(3);//获取到表格中所有员工的工号
            String cellVal=getCellValue(cell);
            System.out.println("-------工号:"+cellVal);
            //通过工号查询到该员工的部门
            String bmmc=findBm(cellVal,yntv,handList);
            System.out.println("-------bmmc:"+bmmc);

            Cell setCellVal=row.getCell(1);//要放入部门的列
            setCellVal.setCellValue(bmmc);
            setCellVal.setCellType(Cell.CELL_TYPE_STRING);
            File file1=new File(filePath,fileName);
            OutputStream out=new FileOutputStream(file1);
            wb.write(out);

//            handList.add(getCellValue(cell));
        }
        return handList;
    }

    /**
     * 获取单元格的内容
     * @param cell
     * @return
     */
    public static String getCellValue(Cell cell){
        String cellValue="";
        if(cell==null){
            return cellValue;
        }
        if(cell.getCellType()==cell.CELL_TYPE_NUMERIC){
            cell.setCellType(cell.CELL_TYPE_STRING);
        }
        //判断类型
        switch (cell.getCellType()){
            case Cell.CELL_TYPE_NUMERIC: //数字
                cellValue=String.valueOf(cell.getNumericCellValue()).trim();
                break;
            case Cell.CELL_TYPE_STRING: //字符串
                cellValue=String.valueOf(cell.getStringCellValue()).trim();
                break;
        }
        return cellValue;
    }

    /**
     * 通过工号查询部门并存入集合
     * @param cellVal
     * @param yntv
     * @param handList
     * @throws SQLException
     */
    public static String findBm(String cellVal,Connection yntv,List<String> handList) throws SQLException {
        String sql = "select bmmc from sys_user where userno="+cellVal;
        Statement st = yntv.createStatement();
        ResultSet rs = st.executeQuery(sql);

        if (rs.next()){
            return rs.getString("bmmc");
        }
        rs.close();
        st.close();

        return null;
    }

    public static void main(String [] args) throws IOException, SQLException {
        Connection yntv = DBUtils.createConn("config/websql.properties");
//        String fileName="hzst.xls";//食堂就餐卡刷卡挂账情况统计表(汉族)
        String fileName="qzst.xls";//清真食堂就餐卡刷卡挂账情况统计表
        String filePath="/home/ljc/Desktop/st/";//读取时的路径
        String descfilePath="/home/ljc/Desktop/st/finishing";//修改后保存的路径
        File file=new File(filePath,fileName);
        Integer statIndex=3;//行数的开始
        Integer endIndex=258;//行数的结束
        List<String> cellVal=getTableHanderList(file,yntv,descfilePath,fileName,statIndex,endIndex);
        for (String str:cellVal){
            System.out.println(str);
        }
    }


}

原文地址：https://www.cnblogs.com/qfmy07/p/11009678.html