Excel的导入V2优化版
有些时候文件上传这一步骤由前端来处理，只将上传后的 URL 传输给后端（可以参考上一文中的图片上传功能），也就是导入请求中并不会直接处理 MultipartFile 对象，而是通过文件 URL 将其下载，之后进行文件流处理，具体过程如下：
点击 “ 导入V2 ” 按钮，与 V1 按钮不同，此时出现的不是文件选择框，而是一个上传文件的弹框，点击弹框里的 “ 上传 Excel 文件 ” 按钮才会出现文件选择框，选择正确的文件后点击确定，请求完成后同 V1 版本的导入功能效果一样。
前端实现
HTML页面
<!-- Main content --><div class="content"><div class="row"><div class="col-12"><div class="card"><div class="card-body"><div class="grid-btn"><button class="btn btn-info" onclick="userAdd()"><i class="fa fa-plus"></i> 新增</button><button class="btn btn-success" onclick="userEdit()"><i class="fa fa-plus"></i> 编辑</button><button class="btn btn-danger" onclick="deleteUser()"><i class="fa fa-remove"></i> 删除</button><button class="btn btn-default" id="importV1Button"><i class="fa fa-upload"></i> 导入ExcelV1</button><button class="btn btn-default" onclick="importV2()"><iclass="fa fa-upload"></i> 导入ExcelV2</button><button class="btn btn-primary" onclick="window.location.href='/users/export'"><i class="fa fa-download"></i> 导出</button></div><table id="jqGrid" class="table table-bordered"></table><div id="jqGridPager"></div></div></div></div></div></div> </div>
HTML模态框(这里用的是Custombox)
<!--导入Excel模态框--><div class="content"><div class="modal" id="importV2Modal" tabindex="-1" role="dialog" aria-labelledby="importV2ModalLabel"><div class="modal-dialog" role="document"><div class="modal-content"><div class="modal-header"><h6 class="modal-title" id="importV2ModalLabel">用户导入</h6></div><div class="modal-body"><div class="form-group"><input type="hidden" id="fileUrl" value=""><div class="col-sm-10"><a class="btn btn-default" id="uploadExcelV2"><i class="fa fa-file">上传Excel文件</i></a></div></div></div><div class="modal-footer"><button type="button" class="btn btn-default" id="cancelImportV2">取消</button><button type="button" class="btn btn-primary" id="importV2Button">确认</button></div></div></div></div></div>
导入的JS
// 用户导入V2 function importV2() {var modal = new Custombox.modal({content: {effect: 'fadein',target: '#importV2Modal'}});modal.open(); }
new AjaxUpload('#uploadExcelV2', {action: 'upload/file',name: 'file',autoSubmit: 'true',responseType: 'json',onSubmit: function (file, extension) {if (!(extension && /^(xlsx)$/.test(extension.toLowerCase()))) {alert('只支持xlsx格式的文件！', {icon: "error",});return false;}},onComplete: function (file, r) {if (r.resultCode == 200) {$("#fileUrl").val(r.data);$("#uploadExcelV2").attr('class','btn-info');alert("上传Excel成功，请点击确认添加数据");return false;} else {alert(r.message);}}}); });
这里还是通过上传获取文件的url再通过流处理转换成File类型并把对应的Excel下载到服务器，其他的和V1版本是一样的
当点击确定导入的时候，如果之前上传没错，再访问一次后台
$("#importV2Button").click(function () {var fileUrl = $("#fileUrl").val();$.ajax({type: 'post',dataType: 'json',url: 'users/importV2?fileUrl=' + fileUrl,contentType:'application/json',success:function (result) {if (result.resultCode==200){closeModal();reload();alert("成功导入"+result.data+"条记录！");}else {closeModal();alert(result.message);};},error:function () {reset();alert("操作失败！");}});
}); 后端逻辑
控制层
package com.ssm.demo.controller;import com.ssm.demo.common.Result; import com.ssm.demo.common.ResultGenerator; import com.ssm.demo.controller.enums.UploadFileTypeEnum; import com.ssm.demo.utils.FileUtil; import org.apache.commons.io.FileUtils; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile;import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import java.io.File; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Random;import static com.ssm.demo.common.Constants.FILE_PRE_URL;/*** Created by 13 on 2017/7/17.*/ @Controller @RequestMapping("/upload") public class UploadFileController {/*** 通用 文件上传接口(可以上传图片、视频、excel等文件，具体格式可在UploadFileTypeEnum中进行配置)** @return*/@RequestMapping(value = "/file", method = RequestMethod.POST)@ResponseBodypublic Result uploadFile(HttpServletRequest request, @RequestParam("file") MultipartFile file) {ServletContext sc = request.getSession().getServletContext();String type = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf(".") + 1, file.getOriginalFilename().length());String fileName = null;UploadFileTypeEnum uploadFileTypeEnum = UploadFileTypeEnum.getFileEnumByType(type);if (uploadFileTypeEnum == UploadFileTypeEnum.ERROR_TYPE) {//格式错误则不允许上传，直接返回错误提示return ResultGenerator.genFailResult("请检查文件格式！");} else {//生成文件名称通用方法SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss");Random r = new Random();StringBuilder tempName = new StringBuilder();tempName.append(sdf.format(new Date())).append(r.nextInt(100)).append(".").append(type);fileName = tempName.toString();}try {String dir = sc.getRealPath("/upload");FileUtils.writeByteArrayToFile(new File(dir, fileName), file.getBytes());} catch (IOException e) {//文件上传异常return ResultGenerator.genFailResult("文件上传失败！");}Result result = ResultGenerator.genSuccessResult();//返回文件的全路径StringBuilder fileUrl = new StringBuilder();fileUrl.append(FILE_PRE_URL).append("/upload/").append(fileName);result.setData(fileUrl.toString());return result;}/*** @param chunks 当前所传文件的分片总数* @param chunk 当前所传文件的当前分片数* @return* @Description: 大文件上传前分片检查* @author: 13*/@ResponseBody@RequestMapping(value = "/checkChunk")public Result checkChunk(HttpServletRequest request, String guid, Integer chunks, Integer chunk, String fileName) {try {String uploadDir = FileUtil.getRealPath(request);String ext = fileName.substring(fileName.lastIndexOf("."));// 判断文件是否分块if (chunks != null && chunk != null) {//文件路径StringBuilder tempFileName = new StringBuilder();tempFileName.append(uploadDir).append(File.separator).append("temp").append(File.separator).append(guid).append(File.separator).append(chunk).append(ext);File tempFile = new File(tempFileName.toString());//是否已存在分片,如果已存在分片则返回SUCCESS结果if (tempFile.exists()) {return ResultGenerator.genSuccessResult("分片已经存在！跳过此分片！");}}} catch (Exception ex) {ex.printStackTrace();return ResultGenerator.genFailResult("error");}return ResultGenerator.genNullResult("不存在分片");}/*** @param chunks 当前所传文件的分片总数* @param chunk 当前所传文件的当前分片数* @return* @Description: 大文件分片上传* @author: 13*/@ResponseBody@RequestMapping(value = "/files")public Result upload(HttpServletRequest request, String guid, Integer chunks, Integer chunk, String name, MultipartFile file) {String filePath = null;//上传存储路径String uploadDir = FileUtil.getRealPath(request);//后缀名String ext = name.substring(name.lastIndexOf("."));StringBuilder tempFileName = new StringBuilder();//等价于 uploadDir + "\\temp\\" + guid + "\\" + chunk + exttempFileName.append(uploadDir).append(File.separator).append("temp").append(File.separator).append(guid).append(File.separator).append(chunk).append(ext);File tempFile = new File(tempFileName.toString());// 判断文件是否分块if (chunks != null && chunk != null) {//根据guid 创建一个临时的文件夹if (!tempFile.exists()) {tempFile.mkdirs();}try {//保存每一个分片 file.transferTo(tempFile);} catch (Exception e) {e.printStackTrace();}//如果当前是最后一个分片，则合并所有文件if (chunk == (chunks - 1)) {StringBuilder tempFileFolder = new StringBuilder();//等价于 uploadDir + "\\temp\\" + guid + File.separatortempFileFolder.append(uploadDir).append(File.separator).append("temp").append(File.separator).append(guid).append(File.separator);String newFileName = FileUtil.mergeFile(chunks, ext, tempFileFolder.toString(), request);filePath = "upload/chunked/" + newFileName;}} else {//不用分片的文件存储到files文件夹中StringBuilder destPath = new StringBuilder();destPath.append(uploadDir).append(File.separator).append("files").append(File.separator);String newName = System.currentTimeMillis() + ext;// 文件新名称try {FileUtil.saveFile(destPath.toString(), newName, file);} catch (IOException e) {e.printStackTrace();}filePath = "upload/files/" + newName;}Result result = ResultGenerator.genSuccessResult();result.setData(filePath);return result;} }
FileUtil工具类
package com.ssm.demo.utils;import org.apache.commons.io.FileUtils; import org.springframework.web.multipart.MultipartFile;import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import java.io.*; import java.net.URL; import java.net.URLConnection; import java.util.UUID;public class FileUtil {/*** 转换MultipartFile对象为java.io.File类型** @param multipartFile* @return*/public static File convertMultipartFileToFile(MultipartFile multipartFile) {File result = null;try {/*** UUID.randomUUID().toString()是javaJDK提供的一个自动生成主键的方法。* UUID(Universally Unique Identifier)全局唯一标识符,是指在一台机器上生成的数字，* 它保证对在同一时空中的所有机器都是唯一的，是由一个十六位的数字组成,表现出来的形式。* 由以下几部分的组合：当前日期和时间(UUID的第一个部分与时间有关，如果你在生成一个UUID之后，* 过几秒又生成一个UUID，则第一个部分不同，其余相同)，时钟序列，* 全局唯一的IEEE机器识别号（如果有网卡，从网卡获得，没有网卡以其他方式获得），* UUID的唯一缺陷在于生成的结果串会比较长。*** File.createTempFile和File.createNewFile()的区别：* 后者只是创建文件，而前者可以给文件名加前缀和后缀*///这里对生成的文件名加了UUID随机生成的前缀,后缀是nullresult = File.createTempFile(UUID.randomUUID().toString(), null);multipartFile.transferTo(result);result.deleteOnExit();} catch (Exception e) {e.printStackTrace();}return result;}/*** 根据url获取文件对象** @param fileUrl* @return*/public static File downloadFile(String fileUrl) {File result = null;try {result = File.createTempFile(UUID.randomUUID().toString(), null);URL url = new URL(fileUrl);URLConnection connection = url.openConnection();connection.setConnectTimeout(3000);BufferedInputStream bis = new BufferedInputStream(connection.getInputStream());BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(result));byte[] car = new byte[1024];int l = 0;while ((l = bis.read(car)) != -1) {bos.write(car, 0, l);}bis.close();bos.close();} catch (Exception e) {e.printStackTrace();}return result;}/*** @param request* @return*/public static String getRealPath(HttpServletRequest request) {ServletContext sc = request.getSession().getServletContext();String uploadDir = sc.getRealPath("/upload");return uploadDir;}public static boolean saveFile(String savePath, String fileFullName, MultipartFile file) throws IOException {File uploadFile = new File(savePath + fileFullName);FileUtils.writeByteArrayToFile(new File(savePath, fileFullName), file.getBytes());return uploadFile.exists();}public static String mergeFile(int chunksNumber, String ext, String uploadFolderPath,HttpServletRequest request) {//合并分片流String mergePath = uploadFolderPath;String destPath = getRealPath(request);// 文件路径String newName = System.currentTimeMillis() + ext;// 文件新名称 SequenceInputStream s;InputStream s1;try {s1 = new FileInputStream(mergePath + 0 + ext);String tempFilePath;InputStream s2 = new FileInputStream(mergePath + 1 + ext);s = new SequenceInputStream(s1, s2);for (int i = 2; i < chunksNumber; i++) {tempFilePath = mergePath + i + ext;InputStream s3 = new FileInputStream(tempFilePath);s = new SequenceInputStream(s, s3);}//分片文件存储到/upload/chunked目录下StringBuilder filePath = new StringBuilder();filePath.append(destPath).append(File.separator).append("chunked").append(File.separator);saveStreamToFile(s, filePath.toString(), newName);// 删除保存分块文件的文件夹 deleteFolder(mergePath);} catch (FileNotFoundException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();}return newName;}private static boolean deleteFolder(String mergePath) {File dir = new File(mergePath);File[] files = dir.listFiles();if (files != null) {for (File file : files) {try {file.delete();} catch (Exception e) {e.printStackTrace();}}}return dir.delete();}private static void saveStreamToFile(SequenceInputStream inputStream, String filePath, String newName)throws Exception {File fileDirectory = new File(filePath);synchronized (fileDirectory) {if (!fileDirectory.exists()) {if (!fileDirectory.mkdir()) {throw new Exception("文件夹创建失败,路径为：" + fileDirectory);}}if (!fileDirectory.exists()) {if (!fileDirectory.mkdir()) {throw new Exception("文件夹创建失败,路径为：" + fileDirectory);}}}OutputStream outputStream = new FileOutputStream(filePath + newName);byte[] buffer = new byte[1024];int len = 0;try {while ((len = inputStream.read(buffer)) != -1) {outputStream.write(buffer, 0, len);outputStream.flush();}} catch (Exception e) {e.printStackTrace();throw e;} finally {outputStream.close();inputStream.close();}} }
其他的和V1版本是一样的
mapper
<update id="deleteUser">update tb_admin_user set is_deleted = 1where id in<foreach collection="array" item="id" open="(" separator="," close=")">#{id}</foreach></update>
效果展示
Excel的导出实现
前端实现
<button class="btn btn-primary" onclick="window.location.href='/users/export'"><i class="fa fa-download"></i> 导出</button>
点击的时候会直接访问到Controller层来获取下载
后端逻辑
/*** 导出功能*/@RequestMapping(value = "/export", method = RequestMethod.GET)public void exportUsers(HttpServletRequest request, HttpServletResponse response) {List<AdminUser> userList = adminUserService.getUsersForExport();//单元格表头String[] excelHeader = {"用户id", "用户名", "账号状态", "添加时间"};//字段名称String[] fileds = {"userId", "userName", "status", "createTime"};//单元格宽度内容格式int[] formats = {4, 2, 1, 1};//单元格宽度int[] widths = {256 * 14, 512 * 14, 256 * 14, 512 * 14};try {List<Map<String, Object>> excelData = new ArrayList<Map<String, Object>>();SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");if (CollectionUtils.isNotEmpty(userList)) {for (AdminUser user : userList) {Map<String, Object> map = new HashMap<>();map.put("userId", user.getId());map.put("userName", user.getUserName());map.put("status", user.getIsDeleted() == 0 ? "正常账号" : "废弃账号");map.put("createTime", formatter.format(user.getCreateTime()));excelData.add(map);}}String excelName = "用户数据_" + System.currentTimeMillis();PoiUtil.exportFile(excelName, excelHeader, fileds, formats, widths, excelData, request, response);} catch (Exception e) {e.printStackTrace();}}
注：这里的一些工具类在上一篇写过了
