SpringBoot+Hutool+thymeleaf完成导出Excel的实现方法

<dependency>
	<groupId>org.projectlombok</groupId>
	<artifactId>lombok</artifactId>
	<optional>true</optional>
</dependency>
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<!-- 导出重要依赖|截止2022-03-09 hutool和poi-ooxml依赖是最新的 -->
<!--POI组件 设置字体样式-->
<dependency>
	<groupId>org.apache.poi</groupId>
	<artifactId>poi-ooxml</artifactId>
	<version>5.2.1</version>
</dependency>
<dependency>
	<groupId>cn.hutool</groupId>
	<artifactId>hutool-all</artifactId>
	<version>5.7.22</version>
</dependency>

import lombok.AllArgsConstructor;
import lombok.Data;

@Data
@AllArgsConstructor
public class User {
    private String name;
    private Integer age;
    private String sex;

}

import cn.hutool.poi.excel.ExcelUtil;
import cn.hutool.poi.excel.ExcelWriter;
import com.gzl.cn.hutoolexcel.domain.User;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.*;

@Controller
@RequestMapping("/test")
public class TestController {

    /**
     * 导出测试
     *
     * @param response
     * @param startDate
     * @param endDate
     */
    @PostMapping("/export")
    public void export2(HttpServletResponse response, String startDate, String endDate) {
        List<User> list = data();

        // 1.创建ExcelWriter
        // 通过工具类创建writer，默认创建xls格式
        ExcelWriter excelWriter = ExcelUtil.getWriter();
        //创建xlsx格式的
        //ExcelWriter writer = ExcelUtil.getWriter(true);

        // 2.设置一级标题
        // 合并单元格后的标题行，使用默认标题样式，从0开始
        excelWriter.merge(2, "学生记录");
        // 设置表头高度
        excelWriter.setRowHeight(0, 25);

        // 3.设置二级标题
        excelWriter.addHeaderAlias("name", "姓名");
        excelWriter.addHeaderAlias("age", "年龄");
        excelWriter.addHeaderAlias("sex", "性别");

        // 4.设置表头字体
        // 获取表头样式，获取样式后可自定义样式
        CellStyle headCellStyle = excelWriter.getHeadCellStyle();
        // 获取单元格样式
//        CellStyle cellStyle = excelWriter.getCellStyle();
        // 设置内容字体
        Font font = excelWriter.createFont();
        // 设置字体
        font.setFontName("宋体");
        // 设置字体大小
        font.setFontHeightInPoints((short) 14);
        // 字体加粗
        font.setBold(true);
        // 字体颜色
        font.setColor(Font.SS_NONE);
        headCellStyle.setFont(font);

        // 5.设置单元格宽度
        int[] arr = {30, 30, 25};
        for (int i = 0; i < arr.length; i++) {
            excelWriter.setColumnWidth(i, arr[i]);
        }

        // 只导出有别名的字段
        excelWriter.setOnlyAlias(true);
        // 一次性写出内容，使用默认样式，强制输出标题
        excelWriter.write(list, true);
        // 从第几行写入
//        excelWriter.setCurrentRow(1);
//        excelWriter.writeRow(data());
        // 设置某个单元格的样式
//        CellStyle orCreateCellStyle = excelWriter.getOrCreateCellStyle(0, 1);
        // 设置某行的样式
//        excelWriter.setRowStyle();

        try {
            String fileName = URLEncoder.encode("统计" + startDate + "日到" + endDate + "日", StandardCharsets.UTF_8.name());
            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
            response.setCharacterEncoding("utf-8");
            response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");
            // 将Excel Workbook刷出到输出流
            excelWriter.flush(response.getOutputStream());
        } catch (IOException e) {
            e.printStackTrace();
            throw new RuntimeException("文件写入失败！");
        }
        //关闭流
        excelWriter.close();
    }

    /**
     * 构造 导出的数据
     *
     * @return
     */
    public List<User> data() {
        List<User> users = new ArrayList<>();
        users.add(new User("张三", 2, "男"));
        users.add(new User("李四", 2, "女"));
        return users;
    }
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://ajax.aspnetcdn.com/ajax/jquery/jquery-3.5.1.min.js"></script>
</head>
<body>
<input type="button" id="clickme" value="导出"/>
</body>
<script type="text/javascript">
    function postExcelFile(params, url) { //params是post请求需要的参数，url是请求url地址
        var form = document.createElement("form");
        form.style.display = 'none';
        form.action = url;
        form.method = "post";
        document.body.appendChild(form);

        for (var key in params) {
            var input = document.createElement("input");
            input.type = "hidden";
            input.name = key;
            input.value = params[key];
            form.appendChild(input);
        }

        form.submit();
        form.remove();
    }

    //点击导出按钮导出excel表格
    clickme.onclick = function () {
        var params = {};
        params.startDate = '2022-01-01';
        params.endDate = '2022-03-03';
        postExcelFile(params, "/test/export");
    }

</script>
</html>