Java操作excel文件插入数据

读取一个表数据根据自己的需求将数据插入到另外一个表中，复制代码下载excel及jar包即可

注意：读取表数据时，表格中的格子没有数据时会读取报错

excel文件及相关jar包：

连接：https://pan.baidu.com/s/1BpLGxBz2dPRvq_eCxFofzA，提取码：aczc

excel表格：（一下插入数据是从表格内随机获取插入数据）

package kf.ats.gvnsvr.client.taizhou.test;

import org.apache.commons.io.FileUtils;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;


public class TestEditExcel {
	//第一行每一列的title
	private static String[] title = new String[] {"部门名称","事项编码","事项名称","创建时间","状态"};
	//生成文件名
	private static String newfilepath = "e:/testNew.xls";
	
	public static void main(String[] args) throws IOException{
		//读取excel表数据
        List<BumenEnity> listMaps = getExcelOne();
        //封装需要写入excel表的数据
        List<Map<String,String>> BodyMap = excelDataList(listMaps);
        //写入数据
		exportXlsgl(BodyMap);
	}

	/**
	 * 读取excel表数据
	 * @return，list对象集合
	 */
	public static List<BumenEnity> getExcelOne(){
		 List<BumenEnity> listMaps = new ArrayList<BumenEnity>();
        File file = new File("D:\\2020CodeFile\\yhs.xlsx");
        /IP地址
        FileInputStream in;
        XSSFWorkbook wb;
		try {
			in = new FileInputStream(file);
			wb = new XSSFWorkbook(in);
	        Sheet sheet = wb.getSheetAt(0); //取得“测试.xlsx”中的第一个表单
	        int firstRowNum = sheet.getFirstRowNum(); 
	        int lastRowNum = sheet.getLastRowNum(); 
	        Row row = null; 
	        for (int i = firstRowNum+1; i <= lastRowNum; i++) { 
	        	 try { 
	        		 BumenEnity map = new BumenEnity();
			         row = sheet.getRow(i);          //取得第i行 （从第二行开始取，因为第一行是表头）
			         map.setDepartment(row.getCell(1).getStringCellValue());
			         map.setName(row.getCell(2).getStringCellValue());
			         map.setService(row.getCell(3).getStringCellValue());
			          
			         listMaps.add(map);
	        	 } catch (Exception e) { 
	                 e.printStackTrace(); 
	             } 
	         }
		} catch (Exception e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		return listMaps;
	}
	
	public static List<Map<String,String>> excelDataList(List<BumenEnity> map){
		List<Map<String,String>> BodyMap = new ArrayList<Map<String, String>>();
        Random r = new Random(1);
        for (int i=0;i<5;i++){
        	int ret = r.nextInt(100);
            Date date = randomDate("2020-09-01","2020-11-20");
            System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date) + "  " + 
            ret + "  " + map.get(ret).getDepartment()  + "  " + map.get(ret).getName() + "  " + 
            map.get(ret).getService());
            
            int max=17,min=8;
            long randomNum = System.currentTimeMillis();
            int ran3 = (int) (randomNum%(max-min)+min);
            DecimalFormat g1=new DecimalFormat("00");
            String startZeroStr = g1.format(Integer.valueOf(ran3));
            Map<String,String> mapdata = new HashMap<String,String>();
            mapdata.put("name1", map.get(ret).getName());
            mapdata.put("name2", map.get(ret).getDepartment());
            mapdata.put("name3", map.get(ret).getService());
            mapdata.put("name4", new SimpleDateFormat("yyyy-MM-dd "+startZeroStr+":mm:ss").format(date));
            mapdata.put("name5", "SUCCESS");
            BodyMap.add(mapdata);
        }
		return BodyMap;
	}
	
	/**
	 * 生成随机时间
	 * @param beginDate开始时间
	 * @param endDate结束时间
	 * @return
	 */
	 private static Date randomDate(String beginDate,String endDate){
        try {
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
            Date start = format.parse(beginDate);
            Date end = format.parse(endDate);
 
            if(start.getTime() >= end.getTime()){
                return null;
            }
            long date = random(start.getTime(),end.getTime());
            return new Date(date);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
 
	 /**
	  * 生成随机数
	  * @param begin
	  * @param end
	  * @return
	  */
    private static long random(long begin,long end){
        long rtn = begin + (long)(Math.random() * (end - begin));
        if(rtn == begin || rtn == end){
            return random(begin,end);
        }
        return rtn;
    }
	
    /**
     * 创建excel文件并插入数据
     * @param BodyMap
     */
	public static void exportXlsgl(List<Map<String,String>> BodyMap){
		//1.创建Excel工作簿
		HSSFWorkbook workbook = new HSSFWorkbook();
		//2.创建一个工作表
		HSSFSheet sheet = workbook.createSheet("sheet2");
		//3.创建第一行
		HSSFRow row = sheet.createRow(0);
		HSSFCell cell = null;
		//4.插入第一行数据
		for (int i = 0; i < title.length; i++) {
			cell=row.createCell(i);
			cell.setCellValue(title[i]);
		}
		//5.追加数据
		int i=1;
		for (Map<String, String> m : BodyMap){ 
			HSSFRow row2=sheet.createRow(i);
			HSSFCell cell2=row2.createCell(0);
			cell2.setCellValue(m.get("name1"));
			cell2=row2.createCell(1);
			cell2.setCellValue(m.get("name2"));
			cell2=row2.createCell(2);
			cell2.setCellValue(m.get("name3"));
			cell2=row2.createCell(3);
			cell2.setCellValue(m.get("name4"));
			cell2=row2.createCell(4);
			cell2.setCellValue(m.get("name5"));
			cell2=row2.createCell(5);
			i++;
		}
		//创建一个文件,将Excel内容存盘
		File file=new File(newfilepath);
		try {
			file.createNewFile();
			FileOutputStream stream=FileUtils.openOutputStream(file);
			workbook.write(stream);
			stream.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

实体类：BumenEnity

插入表数据输出结果：