poi excel 导入导出

<!--excel-poi
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>RELEASE</version>
        </dependency>
-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>RELEASE</version>
        </dependency>

package com.king.king.admin.util;

import com.king.king.admin.model.entity.School;
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 javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.text.DateFormat;
import java.util.Date;
import java.util.List;

/**
 * Created by Administrator on 2019/3/21.
 * excel
 */
public class OutExcelUtil {

    public Boolean ExcelPoI(List<School> values, HttpServletResponse response) {
        //sheet名
        String sheetName = "信息表";
        //excel标题
        String[] title = {"编号", "名称", "日期", "说明"};
        //excel文件名

        String fileName = DateFormat.getDateTimeInstance().format(new Date()) + "--" + System.currentTimeMillis() + ".xls";
        //创建HSSFWorkbook
        HSSFWorkbook wb = getHSSFWorkbook(sheetName, title, values, null);
        //响应到客户端
        try {
            fileName = new String(fileName.getBytes(), "UTF-8");

            response.setContentType("application/octet-stream;charset=UTF-8");
            response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
            response.addHeader("Pargam", "no-cache");
            response.addHeader("Cache-Control", "no-cache");

            OutputStream os = response.getOutputStream();
            wb.write(os);
            os.flush();
            os.close();
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }


    public HSSFWorkbook getHSSFWorkbook(String sheetName, String[] title, List<SchoolTimeTable> values, HSSFWorkbook wb) {

        // 第一步，创建一个HSSFWorkbook，对应一个Excel文件
        if (wb == null) {
            wb = new HSSFWorkbook();
        }

        // 第二步，在workbook中添加一个sheet,对应Excel文件中的sheet
        HSSFSheet sheet = wb.createSheet(sheetName);

        // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制
        HSSFRow row = sheet.createRow(0);

        //声明列对象
        HSSFCell cell;

        //创建标题
        for (int i = 0; i < title.length; i++) {
            cell = row.createCell(i);
            cell.setCellValue(title[i]);
        }

        //创建内容
        int i = 0;
        for (School user : values) {
            row = sheet.createRow(i + 1);
            for (int j = 0; j < title.length; j++) {
                //将内容按顺序赋给对应的列对象
                if (j == 0) {
                    row.createCell(j).setCellValue(user.getClassId());
                } else if (j == 1) {
                    row.createCell(j).setCellValue(user.getClassName());
                } else if (j == 2) {
                    row.createCell(j).setCellValue(user.getClassroom());
                } else if (j == 3) {
                    row.createCell(j).setCellValue(user.getCourseName());
                }
            }
            i++;
        }
        return wb;
    }

}

 

 

import javax.servlet.http.HttpServletResponse;

/**
     * 导出
     *
     * @param response
     * @return
     */
    @RequestMapping("/outSchool")
    public R<Boolean> outSchoolData(HttpServletResponse response) {

        return new R<>(new OutExcelUtil().ExcelPoI(schoolTimeService.selectList
(new EntityWrapper<>()), response));
    }