Java使用poi的Excel导出功能

pom.xml

<dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.6</version>
        </dependency>
           

Until

package com.zoomy.until;


import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

/**
 * @description:
 * @author: zmh
 * @date: 2021-09-16 13:59
 */
public class ExcelUtil {

    /**
     * 导出Excel
     *
     * @param sheetName sheet名称
     * @param title     标题
     * @param values    内容
     * @param wb        HSSFWorkbook对象
     * @return
     */
    public static HSSFWorkbook getHSSFWorkbook(String sheetName, String[] title, String[][] 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);

        // 第四步，创建单元格，并设置值表头 设置表头居中
        HSSFCellStyle style = wb.createCellStyle();
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式

        //声明列对象
        HSSFCell cell = null;

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

        //创建内容
        for (int i = 0; i < values.length; i++) {
            row = sheet.createRow(i + 1);
            for (int j = 0; j < values[i].length; j++) {
                //将内容按顺序赋给对应的列对象
                row.createCell(j).setCellValue(values[i][j]);
            }
        }
        return wb;
    }
}
           

Controller

package com.zoomy.controller.admin;

import com.zoomy.service.CommentService;
import com.zoomy.until.ExcelUtil;
import com.zoomy.vo.CommentVo;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.List;

/**
 * @description:
 * @author: zmh
 * @date: 2021-09-16 13:58
 */

@Controller
@RequestMapping(value = "/report")
public class UploadExcelController {


    @Autowired
    private CommentService commentService;

    /**
     * 导出报表
     *
     * @return
     */
    @GetMapping(value = "/export")
    @ResponseBody
    public void export(HttpServletRequest request, HttpServletResponse response) throws Exception {
        //获取数据
        List<CommentVo> list = commentService.listCommentByBlogId(4L);

        //excel标题
        String[] title = {"名称", "性别", "年龄", "学校", "班级"};

        //excel文件名
        String fileName = "学生信息表" + System.currentTimeMillis() + ".xls";

        //sheet名
        String sheetName = "学生信息表";


        String[][] content = new String[title.length][list.size()];
        for (int i = 0; i < list.size(); i++) {
            content[i] = new String[title.length];
            CommentVo obj = list.get(i);
            content[i][0] = obj.getNickname();
            content[i][1] = obj.getAvatar();
            content[i][2] = obj.getContent();
            content[i][3] = obj.getEmail();
            content[i][4] = obj.getParentNickname();
        }

        //创建HSSFWorkbook
        HSSFWorkbook wb = ExcelUtil.getHSSFWorkbook(sheetName, title, content, null);

        //响应到客户端
        try {
            this.setResponseHeader(response, fileName);
            OutputStream os = response.getOutputStream();
            wb.write(os);
            os.flush();
            os.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //发送响应流方法
    public void setResponseHeader(HttpServletResponse response, String fileName) {
        try {
//            try {
//                fileName = new String(fileName.getBytes(), "ISO8859-1");
//            } catch (UnsupportedEncodingException e) {
//                // TODO Auto-generated catch block
//                e.printStackTrace();
//            }
            response.setContentType("application/octet-stream;charset=ISO8859-1");
            response.setHeader( "Content-Disposition", "attachment;filename=" +  java.net.URLEncoder.encode(fileName, "UTF-8"));
            response.addHeader("Pargam", "no-cache");
            response.addHeader("Cache-Control", "no-cache");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}