java最实用的excel导出（实用）

本是古典何须时尚 2023-10-11 20:46 15阅读 0赞

## 项目场景：java最实用的excel导出（实用） ##

/** 通用excel导出接口
         * fileName 导出的excel名称
         * allList 导出数据list
         * map 导出的列名 key:数据字段  value：字段名称
         * */
        public static <E> void allExcelResponse(HttpServletResponse response, String fileName, List<E> allList, Map<String,String> map){
        
            if(CollectionUtil.isEmpty(allList)){
        
                return;
            }
            cn.hutool.poi.excel.ExcelWriter writer = cn.hutool.poi.excel.ExcelUtil.getWriter();
            try {
        
                Set<String> strings = map.keySet();
                for (String key : strings) {
        
                    writer.addHeaderAlias(key,map.get(key));
                }
                writer.setOnlyAlias(true);
                writer.write(allList, true);
                Font font = writer.createFont();
                font.setFontHeight((short) 230);
                writer.getStyleSet().setFont(font, false);
                int columnCount = writer.getColumnCount();
                for (int i = 0; i < columnCount; ++i) {
        
                    double width = SheetUtil.getColumnWidth(writer.getSheet(), i, false);
                    if (width != -1.0D) {
        
                        width *= 256.0D;
                        //此处可以适当调整，调整列空白处宽度
                        width += 420D;
                        writer.setColumnWidth(i, Math.toIntExact(Math.round(width / 256D)));
                        writer.setRowHeight(i, 15);
                        if (i == (columnCount - 1)) {
        
                            writer.setColumnWidth(i, 19);
                        }
                    }
                }
                response.setContentType("application/vnd.ms-excel;charset=utf-8");
                response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8") + ".xls");
                ServletOutputStream out = response.getOutputStream();
                writer.flush(out, true);
                writer.close();
                IoUtil.close(out);
            } catch (IOException e) {
        
                e.printStackTrace();
            } finally {
        
                writer.close();
            }
        }

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