使用hutool和poi优雅导出excle

需求:

• 1. 首行字体单独设置,背景颜色按指定需求输出
• 2.不同列限制不同字数,字数达到限制数后,要求自动换行输出

主要代码参考如下:

如果涉及大量请求,需要单独做异步处理

    @RequestMapping("export")
    @ResponseBody
    public void export(HttpServletResponse response) {
        try (
                //不适于大量数据情况
                ExcelWriter writer = ExcelUtil.getWriter();
                ServletOutputStream out = response.getOutputStream();
                HSSFWorkbook hssfworkbook = (HSSFWorkbook) writer.getWorkbook();
        ) {
            List<User> list = new ArrayList<>();
            list.add(new User("zhangsanddddddddddddddddddddddddddddddddddddddddddddddddd", "1231", new Date()));
            list.add(new User("zhangsan1ddddddddddddddddddddddddddddddd", "1232", new Date()));
            list.add(new User("zhangsan2dddddddddddddddddd", "1233", new Date()));
            list.add(new User("zhangsan3", "1234", new Date()));
            list.add(new User("zhangsan4", "1235", new Date()));
            list.add(new User("zhangsan5", "1236", DateUtil.date(new Date())));

            //自定义单元格样式,获取头部样式编辑
            CellStyle headCellStyle = writer.getHeadCellStyle();
            //预定义填充样式
            headCellStyle.setFillForegroundColor(HSSFColor.HSSFColorPredefined.LIME.getIndex());
            //拿到palette颜色板
            HSSFPalette palette = hssfworkbook.getCustomPalette();
            //把预填充的HSSFColor.HSSFColorPredefined.LIME.getIndex()替换为期望RGB颜色
            palette.setColorAtIndex(HSSFColor.HSSFColorPredefined.LIME.getIndex(), (byte) 192, (byte) 0, (byte) 0);

            Font font = writer.createFont();
            font.setColor(IndexedColors.WHITE.getIndex());
            font.setBold(true);
            //设置字体
            font.setFontName("微软雅黑");
            headCellStyle.setFont(font);

            //设置对应列间距,不设置默认10,即最终达到9个字符时会自动换行
            writer.setColumnWidth(0, 40);
            writer.setColumnWidth(1, 20);
            writer.setColumnWidth(2, 30);
            writer.setColumnWidth(3, 40);

            //设置所有单元格超过设置列间距自动换行
            StyleSet ss = writer.getStyleSet();
            ss.setWrapText();
            writer.setStyleSet(ss);

            //自定义标题别名,可能因为版本导致顺序问题,如果需要加别名,建议所有字段都加上别名
            writer.addHeaderAlias("name", "姓名");
            writer.addHeaderAlias("age", "年龄");
            writer.addHeaderAlias("birthday", "生日");

            // 合并单元格后的标题行，使用默认标题样式
            //writer.merge(2, "自定义标题");

            // 一次性写出内容，使用默认样式，强制输出标题
            writer.write(list, true);
            //out为OutputStream，需要写出到的目标流
            //response为HttpServletResponse对象
            response.setContentType("application/vnd.ms-excel;charset=utf-8");
            //需要转码
            String name = "测试11UTF-8";
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(name, "UTF-8") + ".xls");
            writer.flush(out, true);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

pom

        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.4.5</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>4.1.2</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>3.17</version>
        </dependency>

导出后结果

image.png

参考:
https://blog.csdn.net/AlbenXie/article/details/109712434
https://www.coder.work/article/4682438