同样的，看你要导出的Excel后缀是xls格式还是xlsx格式，不同的格式代码稍微有些不同，下面是导出xlsx格式的Excel。

Maven:

 org.apache.poi            poi            3.9org.apache.poi            poi-ooxml            3.9

Controller层：

/**     * 导出Excel     * @param pageable     * @param date     * @param response     * @throws IOException     */    @GetMapping("test/export")    public void exportDormCheckScore(@PageableDefault(size = 1000000) Pageable pageable,                                     @RequestParam(value = "date",required = false) String date,                                     HttpServletResponse response) throws IOException {        Page page=testService.findTestList(pageable,date); //分页查询出来的数据        List list=page.getContent(); //获取数据        XSSFWorkbook wb = ExcelUtils.createdTestExcel(list);  //生成Excel文件        //响应到客户端        this.setResponseHeader(response, "测试" + System.currentTimeMillis() + ".xlsx");  //Excel文件命名        OutputStream os = response.getOutputStream();        wb.write(os);        os.flush();        os.close();    }     /**     * 设置响应流     *     * @param response     * @param fileName     */    public void setResponseHeader(HttpServletResponse response, String fileName) throws IOException {        fileName = new String(fileName.getBytes("utf-8"), "ISO-8859-1");        response.setCharacterEncoding("utf-8");        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");        response.setHeader("Content-Disposition", "attachment;filename=" + fileName);    }

ExcelUtils的createdTestExcel生成Excel方法：

/** * 创建excel文件 * * @param list * @return */public static XSSFWorkbook createdTestExcel(List list) {XSSFWorkbook workbook = new XSSFWorkbook();XSSFSheet sheet = workbook.createSheet();CellStyle headsStyle = workbook.createCellStyle();// 创建一个居中格式headsStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);//设置表头背景颜色headsStyle.setFillForegroundColor(HSSFColor.LIGHT_GREEN.index);headsStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);//下边框headsStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);//左边框headsStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);//上边框headsStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);//右边框headsStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);XSSFFont font = workbook.createFont();font.setFontName("黑体");//设置字体大小font.setFontHeightInPoints((short) 12);headsStyle.setFont(font);XSSFCellStyle borderStyle = workbook.createCellStyle();borderStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);//下边框borderStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);//左边框borderStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);//上边框borderStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);//右边框borderStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);XSSFFont borderFont = workbook.createFont();borderFont.setFontName("黑体");//设置字体大小borderFont.setFontHeightInPoints((short) 11);borderStyle.setFont(borderFont);XSSFRow row = sheet.createRow(0);Integer columnNum = 0;//第一行表头字段for (ExportTestColumnsEnum column : ExportTestColumnsEnum.values()) {XSSFCell cell = row.createCell(columnNum);cell.setCellValue(column.getColumnName());cell.setCellStyle(headsStyle);sheet.setColumnWidth(columnNum, 20 * 256);columnNum++;}Integer dataColumnNum = 1;//计算序号的计数器int count=1;  //序号//开始生成数据for (ReturnVO returnVO : list) {XSSFRow rows = sheet.createRow(dataColumnNum);doSetColumnValue(rows, borderStyle, 0, count);  //序号count++;doSetColumnValue(rows, borderStyle, 1, returnVO.getName());  //姓名doSetColumnValue(rows, borderStyle, 2, returnVO.getAge());   //年龄doSetColumnValue(rows, borderStyle, 3, returnVO.getDate()); //出身日期doSetColumnValue(rows, borderStyle, 4,returnVO.getHeight());   //身高dataColumnNum++;}return workbook;}

表头字段枚举类ExportTestColumnsEnum：

@Getter@AllArgsConstructorpublic enum ExportTestColumnsEnum {     /**     * 列     */    ROW1("序号"),    ROW2("姓名"),    ROW3("年龄"),    ROW4("性别"),    ROW5("出身日期"),    ROW16("身高"),    ;     private String columnName; }

上面就生成了xlsx格式的Excel文件，至于如何生成xls格式的Excel文件也很简单，只需要把XSSFWorkbook、XSSFSheet、XSSFRow这些以“XSSF”为前缀的改为“HSSF”就可以生成xls版本的Excel文件了。