<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.16</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.16</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.16</version>
</dependency>

//前端
<td id="sadd" name="oo">sadd</td>
//js
var oo=$("#sadd").text();
window.location.href = "ha?sadd="+oo;
//后端@RequestMapping("ha")public String ha(Model m,@RequestParam String sadd) {String oosda=sadd;System.out.println(oosda);m.addAttribute("name", "hah");return "hello";}

@RequestMapping("export")public ResponseEntity<byte[]> userExcel() throws Exception {/*所有表头*/Map<String,Map<String,String>> titleMaps=new LinkedHashMap<String,Map<String,String>>();/*所有数据*/Map<String,List<Map>> results=new HashMap<String,List<Map>>();/*每个表格的列标题*/Map<String,String> title=new LinkedHashMap<String, String>();title.put("uid", "Id");title.put("username", "用户名");title.put("password", "密码");//行初始化为空值List<Map> nullRows=new ArrayList<Map>();Map nullMap=new HashMap();nullMap.put("uid", "");nullMap.put("username", "");nullMap.put("password", "");nullRows.add(nullMap);//文件名String filename="用户信息";titleMaps.put(filename, title);//从数据库查询数据List<Map> collentList=userService.userExcel();        results.put(filename, collentList);ByteArrayOutputStream out = new ByteArrayOutputStream();ExcelUtilNew.exportExcelDocument(titleMaps, results,out);System.out.println("我来了");HttpHeaders headers = new HttpHeaders();headers.add("Content-Disposition", "attchement;filename=" + URLEncoder.encode(filename, "utf-8")+".xlsx");return new ResponseEntity<byte[]>(out.toByteArray(), headers, HttpStatus.CREATED);}

/*** 导出Excel文档* * @throws FileNotFoundException*/public static void exportExcelDocument(Map<String, String> titleMap, List<Map> result, OutputStream out)throws Exception {Map<String, Map<String, String>> titleMaps = new HashMap<String, Map<String, String>>();titleMaps.put("Sheet1", titleMap);Map<String, List<Map>> results = new HashMap<String, List<Map>>();results.put("Sheet1", result);exportExcelDocument(titleMaps, results, out);}public static void exportExcelDocument(Map<String, Map<String, String>> titleMaps, Map<String, List<Map>> results,OutputStream out) throws Exception {// 声明一个工作薄Workbook workbook = new HSSFWorkbook();for (String s : titleMaps.keySet()) {Map<String, String> titleMap = titleMaps.get(s);List<Map> result = results.get(s);// 生成一个表格Sheet sheet = workbook.createSheet((s == null || "".equals(s)) ? "未命名" : s);// 网格线sheet.setDisplayGridlines(true);// 设置默认表宽sheet.setDefaultColumnWidth(20);// 产生表格标题行Row row = sheet.createRow(0);// 生成一个样式CellStyle titleStyle = workbook.createCellStyle();// 设置这些样式
            titleStyle.setAlignment(CellStyle.ALIGN_CENTER);titleStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);// 生成一个字体Font titleFont = workbook.createFont();titleFont.setFontName("Arial");titleFont.setFontHeightInPoints((short) 12);titleFont.setBoldweight(Font.BOLDWEIGHT_BOLD);// 把字体应用到当前的样式
            titleStyle.setFont(titleFont);int count = 0;for (String key : titleMap.keySet()) {Cell cell = row.createCell(count);cell.setCellStyle(titleStyle);cell.setCellValue(titleMap.get(key));count++;}if (result != null) {for (int i = 0, iSize = result.size(); i < iSize; i++) {Map<String, Object> resultMap = result.get(i);// 生成一个字体Font contentFont = workbook.createFont();contentFont.setFontName("宋体");contentFont.setFontHeightInPoints((short) 10);contentFont.setBoldweight(Font.BOLDWEIGHT_NORMAL);// 生成一个样式CellStyle contentStyle = workbook.createCellStyle();contentStyle.setAlignment(CellStyle.ALIGN_LEFT);contentStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);row = sheet.createRow(i + 1);// 把字体添加到样式中去
                    contentStyle.setFont(contentFont);count = 0;for (String key : titleMap.keySet()) {Cell cell = row.createCell(count);cell.setCellStyle(contentStyle);cell.setCellValue(String.valueOf(resultMap.get(key)));count++;}}}}workbook.write(out);out.flush();out.close();}