Java利用POI實現導入導出Excel表格
本文實例為大傢分享瞭Java利用POI實現導入導出Excel表格的具體代碼,供大傢參考,具體內容如下
一、Java利用POI實現導入導出Excel表格demo
1.引入依賴
<dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>4.1.2</version> </dependency>
2.導入demo
2.1 controller層
/** * Excel導入 */ @PostMapping("/import") public Result userImport2(@RequestParam("file") MultipartFile file) throws Exception{ Result result=userService.userImportExcel(file); return result; }
2.2 service實現類層
public Result userImportExcel(MultipartFile file){ try { InputStream inputStream = file.getInputStream(); XSSFWorkbook sheets = new XSSFWorkbook(inputStream); //獲取表單sheet 第一個 XSSFSheet sheetAt = sheets.getSheetAt(0); //獲取第一行 int firstRowNum = sheetAt.getFirstRowNum(); //最後一行 int lastRowNum = sheetAt.getLastRowNum(); //存入數據集合 List<User> users=new ArrayList<>(); //遍歷數據 for(int i=firstRowNum+1;i<lastRowNum+1;i++){ XSSFRow row = sheetAt.getRow(i); if(row!=null){ /* //獲取第一行的第一列 int firstCellNum = row.getFirstCellNum(); //獲取第一行的最後列 short lastCellNum = row.getLastCellNum(); for (int j=firstCellNum;j<lastCellNum+1;j++){ //放入集合中需要可以用這種方法 String cellValue = getValue(row.getCell(firstCellNum)); }*/ //這裡我就直接賦值 User user = new User(); user.setUname(row.getCell(0).getStringCellValue()); user.setUpassword(row.getCell(1).getStringCellValue()); user.setUsex(row.getCell(2).getStringCellValue()); user.setRole(row.getCell(3).getStringCellValue()); user.setUlove((int) row.getCell(4).getNumericCellValue()); user.setUphoto(row.getCell(5).getStringCellValue()); user.setUaddress(row.getCell(6).getStringCellValue()); users.add(user); } } //保存數據 saveBatch(users); return Result.success(); }catch (Exception e){ e.printStackTrace(); log.info("error:{}",e); } return Result.error("300","導入失敗"); } /** * 判斷值的類型 */ public String getValue(HSSFCell cell) { if(cell==null){ return ""; } String cellValue= ""; try { DecimalFormat df=new DecimalFormat("0.00"); if(cell.getCellType()== CellType.NUMERIC){ //日期時間轉換 if(HSSFDateUtil.isCellDateFormatted(cell)){ cellValue=DateFormatUtils.format(cell.getDateCellValue(),"yyyy-MM-dd"); }else{ NumberFormat instance = NumberFormat.getInstance(); cellValue=instance.format(cell.getNumericCellValue()).replace(",",""); } }else if(cell.getCellType() == CellType.STRING){ //字符串 cellValue=cell.getStringCellValue(); }else if(cell.getCellType() == CellType.BOOLEAN){ //Boolean cellValue= String.valueOf(cell.getBooleanCellValue()); }else if(cell.getCellType() == CellType.ERROR){ //錯誤 }else if(cell.getCellType() == CellType.FORMULA){ //轉換公式 保留兩位 cellValue=df.format(cell.getNumericCellValue()); }else{ cellValue=null; } } catch (Exception e) { e.printStackTrace(); cellValue="-1"; } return cellValue; }
3.導出demo
3.1 controller層
/** * 導出 * @param response * @return * @throws Exception */ @GetMapping("/export") public Result userExport2(HttpServletResponse response) throws Exception{ Result result=userService.userExportExcel(response); return result; }
3.2 service實現類
public Result userExportExcel(HttpServletResponse response) { try { //創建excel XSSFWorkbook sheets = new XSSFWorkbook(); //創建行 XSSFSheet sheet = sheets.createSheet("用戶信息"); //格式設置 XSSFCellStyle cellStyle = sheets.createCellStyle(); //橫向居中 cellStyle.setAlignment(HorizontalAlignment.CENTER); //創建單元格第一列 XSSFRow row = sheet.createRow(0); //表頭 this.titleExcel(row,cellStyle); //查詢全部的用戶數據 mybatis-plus List<User> list = list(); //遍歷設置值 for(int i=0;i<list.size();i++){ XSSFRow rows = sheet.createRow(i+1); User user=list.get(i); //表格裡賦值 this.titleExcelValue(user,rows,cellStyle); } //設置瀏覽器響應格式 response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8"); String filName= URLEncoder.encode("用戶信息","UTF-8"); response.setHeader("Content-Disposition","attachment;filename="+filName+".xls"); ServletOutputStream outputStream=response.getOutputStream(); sheets.write(outputStream); outputStream.close(); sheets.close(); return Result.success(); }catch (Exception e){ e.printStackTrace(); log.info("error:{}",e); } return Result.error("300","導出失敗"); } /** *表格裡賦值 **/ public void titleExcelValue(User user, XSSFRow row,XSSFCellStyle cellStyle) { XSSFCell cellId = row.createCell(0); cellId.setCellValue(user.getUid()); cellId.setCellStyle(cellStyle); XSSFCell cellUserName = row.createCell(1); cellUserName.setCellValue(user.getUname()); cellUserName.setCellStyle(cellStyle); XSSFCell cellPassword = row.createCell(2); cellPassword.setCellValue(user.getUpassword()); cellPassword.setCellStyle(cellStyle); XSSFCell cellSex = row.createCell(3); cellSex.setCellValue(user.getUsex()); cellSex.setCellStyle(cellStyle); XSSFCell cellRole = row.createCell(4); cellRole.setCellValue(user.getRole()); cellRole.setCellStyle(cellStyle); XSSFCell cellLoveValue = row.createCell(5); cellLoveValue.setCellValue(user.getRole()); cellLoveValue.setCellStyle(cellStyle); XSSFCell cellPhone = row.createCell(6); cellPhone.setCellValue(user.getUphoto()); cellPhone.setCellStyle(cellStyle); XSSFCell cellAddress = row.createCell(7); cellAddress.setCellValue(user.getUaddress()); cellAddress.setCellStyle(cellStyle); } /** 表頭 **/ public void titleExcel(XSSFRow row,XSSFCellStyle cellStyle){ XSSFCell cellId = row.createCell(0); cellId.setCellValue("用戶ID"); cellId.setCellStyle(cellStyle); XSSFCell cellUserName = row.createCell(1); cellUserName.setCellValue("用戶名"); cellUserName.setCellStyle(cellStyle); XSSFCell cellPassword = row.createCell(2); cellPassword.setCellValue("密碼"); cellPassword.setCellStyle(cellStyle); XSSFCell cellSex = row.createCell(3); cellSex.setCellValue("性別"); cellSex.setCellStyle(cellStyle); XSSFCell cellRole = row.createCell(4); cellRole.setCellValue("角色"); cellRole.setCellStyle(cellStyle); XSSFCell cellLoveValue = row.createCell(5); cellLoveValue.setCellValue("愛心值"); cellLoveValue.setCellStyle(cellStyle); XSSFCell cellPhone = row.createCell(6); cellPhone.setCellValue("電話號碼"); cellPhone.setCellStyle(cellStyle); XSSFCell cellAddress = row.createCell(7); cellAddress.setCellValue("地址"); cellAddress.setCellStyle(cellStyle); }
二、Hutool工具類封裝方法導出導入Excel
1.引入依賴
把poi封裝到工具類方法裡面
<!-- hutool --> <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.7.20</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>4.1.2</version> </dependency>
2.導入demo
/** * Excel導入 */ @PostMapping("/import") public Result userImport(@RequestParam("file") MultipartFile file) throws Exception{ System.out.println(file.toString()); //InputStream inputStream = multipartFile.getInputStream(); InputStream inputStream = file.getInputStream(); ExcelReader reader = ExcelUtil.getReader(inputStream); //讀取表的內容 List<List<Object>> list = reader.read(1); List<User> users = new ArrayList<>(); for(List<Object> row : list){ User user = new User(); user.setUname(row.get(0).toString()); user.setUpassword(row.get(1).toString()); user.setUsex(row.get(2).toString()); user.setRole(row.get(3).toString()); user.setUlove(Integer.valueOf(row.get(4).toString())); user.setUphoto(row.get(5).toString()); user.setUaddress(row.get(6).toString()); users.add(user); } //批量插入用戶信息 mybatis-plus userService.saveBatch(users); return Result.success(); }
3.導出demo
/** * Excel導出 方法一 */ @GetMapping("/export") public Result userExport(HttpServletResponse response) throws Exception{ //查詢全部的用戶數據 List<User> list = userService.list(); //在內存裡做操作,保存到瀏覽器 ExcelWriter writer = ExcelUtil.getWriter(true); //自定義標題別名 writer.addHeaderAlias("uname","用戶名"); writer.addHeaderAlias("upassword","密碼"); writer.addHeaderAlias("usex","性別"); writer.addHeaderAlias("role","角色"); writer.addHeaderAlias("ulove","愛心值"); writer.addHeaderAlias("uphoto","電話號碼"); writer.addHeaderAlias("uaddress","地址"); //一次性寫出list內的對象的Excel,使用默認樣式,強制輸出標題 writer.write(list,true); //設置瀏覽器響應格式 response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8"); String filName= URLEncoder.encode("用戶信息","UTF-8"); response.setHeader("Content-Disposition","attachment;filename="+filName+".xls"); ServletOutputStream outputStream=response.getOutputStream(); writer.flush(outputStream,true); outputStream.close(); writer.close(); return Result.success(); }
以上就是本文的全部內容,希望對大傢的學習有所幫助,也希望大傢多多支持WalkonNet。
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