excel导入到java/导出到excel

package com.test.order.config;

import com.test.order.domain.HavalDO;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.xssf.usermodel.*;

import java.io.*;
import java.util.ArrayList;
import java.util.List;

/**
 * @program: TestDemo
 * @Date: 2018/8/19 12:55
 * @Author: Mr.Niu
 * @Description:
 */
public class ExcelHelper {

    public List<HavalDO> excleIn() {
        List<HavalDO> list = new ArrayList<HavalDO>();
        HavalDO havalDO = null;
        try {
            InputStream is = new FileInputStream("E:\bzk.xlsx");
            XSSFWorkbook xssfWorkbook = new XSSFWorkbook(is);
            // 获取选项卡对象 第0个选项卡 , 因为们这里只有一个选项卡，如果你每个选项卡的内容是一样，可以通过循环取出
            XSSFSheet xssfSheet = xssfWorkbook.getSheetAt(0);
            // 循环取出每行的值
            for (int rowNum = 1; rowNum <= xssfSheet.getLastRowNum(); rowNum++) {
                XSSFRow xssfRow = xssfSheet.getRow(rowNum);
                havalDO = new HavalDO();
                //注意Poi读取的内容是有类型的，处理起来也jxl有所不同
                String str = null;
                if(xssfRow.getCell(0)!=null){
                    xssfRow.getCell(0).setCellType(Cell.CELL_TYPE_STRING);
                    str = xssfRow.getCell(0).getStringCellValue();
                }
                String [] strs=str.split("-");
                String append = null;
                for (String s1 :strs){
                    append+=s1;
                }
                String strss = append.substring(4,append.length());
                havalDO.setOem(strss);
                havalDO.setName(xssfRow.getCell(1).getStringCellValue());
                havalDO.setPrice(xssfRow.getCell(2).getNumericCellValue());
                list.add(havalDO);
            }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return list;
    }

    /**
     * 针对Book类进行导出的操作
     *
     * @param list
     */
    public void excleOut(List<HavalDO> list) {
        // 创建Excel文档
        XSSFWorkbook hwb = new XSSFWorkbook();
        // 通过excle对象创建一个选项卡对象
        XSSFSheet sheet = hwb.createSheet("sheet1");
        HavalDO havalDO = null;
        // 循环list创建行
        // 新建一行
        XSSFRow row = sheet.createRow(0);
            // 设置i+1行第0列的数据
            row.createCell(0).setCellValue("oem");
            // 设置i+1行第1列的数据
            row.createCell(1).setCellValue("name");
            // 设置i+1行第2列的数据
            row.createCell(2).setCellValue("price_4s");
        //
        for (int i = 1; i < list.size(); i++) {
            // 新建一行
            row = sheet.createRow(i);
            havalDO = list.get(i);
            // 设置i+1行第0列的数据
            row.createCell(0).setCellValue(havalDO.getOem());
            // 设置i+1行第1列的数据
            row.createCell(1).setCellValue(havalDO.getName());
            // 设置i+1行第2列的数据
            row.createCell(2).setCellValue(havalDO.getPrice());
        }
        OutputStream out = null;
        try {
            out = new FileOutputStream("E:/bookPoi1.xlsx");
            hwb.write(out);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                out.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    public static void main(String[] args) {
            ExcelHelper eh = new ExcelHelper();
            List<HavalDO> lh = eh.excleIn();
            Integer i = 0;
            for (HavalDO hd : lh) {
                i++;
                System.out.println("第" + i + "行数据：" + hd.toString());
            }
            eh.excleOut(lh);
        }
}