excel导出，导出导出证件图片（png/jpeg）

深碍√TFBOYSˉ_ 2022-04-02 18:48 342阅读 0赞

>     List<File> fileList = FileExportImportUtil.bufferImage(pictureList, picDir, nameList);

下面为完成代码

excel 导出学员证件照并以手机号和姓名

@RequestMapping("/userGroup/export/{groupId}")
        public void userGroupInfoExport(HttpServletRequest request,
                                        @PathVariable("groupId") Long groupId,
                                        @ModelAttribute("studentGroupDto") StudentGroupDto studentGroupDto,
                                        HttpServletResponse response) {
            try {
                // 指定文件生成路径
    
    
                String dir = request.getSession().getServletContext().getRealPath("/excelfile/user");
    
                String picDir = request.getSession().getServletContext().getRealPath("/certificate/picture");
    
                // 文件名
                String expName = "学员信息_" + DateUtils.getStringDateShort();
    
                // 表头信息
                String[] headName = {"学员ID", "真实姓名", "性别", "工作单位", "身份证号","省","市","县", "地址", "邮编", "电话", "邮箱", "学员职务", "行政级别", "民族", "学员分类", "学员单位性质", "学历", "项目名称", "组名", "期末考试成绩", "考试时间", "出生时间"};
                // 拆分为一万条数据每Excel，防止内存使用太大
                PageEntity page = new PageEntity();
                page.setPageSize(10000);
                studentGroupDto.setId(groupId);
                page.setCurrentPage(1);
                studentGroupService.getStudentGroupListPage(studentGroupDto, page);
                int num = page.getTotalPageSize();// 总页数
                List<File> srcfile = new ArrayList<File>();// 生成的excel的文件的list
                for (int i = 1; i <= num; i++) {// 循环生成num个xls文件
                    page.setCurrentPage(i);
                    List<StudentGroupDto> studentGroupDtos2 = studentGroupService.getStudentGroupListPage(studentGroupDto, page);
                    List<List<String>> list = studentGroupDeal(studentGroupDtos2);
                    File file = FileExportImportUtil.createExcel(headName, list, expName + "_" + i, dir);
    
                    //学生的图片
                    List<String> pictureList = new ArrayList<>();
                    List<Long> userIdList = new ArrayList<>();
                    List<String> nameList = new LinkedList<>();
    
                    //存名字和手机号后四位的结合
                    Set<String> nameSet = new HashSet<>();
                    Set<String> sameNameSet = new HashSet<>();
                    if (ObjectUtils.isNotNull(studentGroupDto)) {
    
                        //      取出相同的姓名的集合
                        for (StudentGroupDto studentGroupDto1 : studentGroupDtos2) {
                            String realName = studentGroupDto1.getUserName();
                            if (StringUtils.isEmpty(realName)) {
                                continue;
                            }
                            System.out.println(nameSet.contains(realName));
                            if (!nameSet.contains(realName)) {
                                nameSet.add(realName.replace(" ", ""));
                            } else {
                                sameNameSet.add(realName);
                            }
                        }
    
                        for (StudentGroupDto studentGroupDto1 : studentGroupDtos2) {
                            Long userId = studentGroupDto1.getUserId();
                            //真实姓名
    
                            userIdList.add(userId);
                            if (StringUtils.isNotEmpty(String.valueOf(userId))) {
                                User user = userService.getUserById(userId);
                                if (StringUtils.isNotEmpty(String.valueOf(user.getCertificateId()))) {
                                    UserCertificate userCertificate = userCertificateService.getUserCertificateById(user.getCertificateId());
                                    if (ObjectUtils.isNotNull(userCertificate)) {
                                        if (StringUtils.isNotEmpty(userCertificate.getIdentityPhoto())) {
                                            //      导出证件照为姓名+手机号后四位
                                            String realName = studentGroupDto1.getUserName();
                                            if (StringUtils.isEmpty(realName)) {
                                                continue;
                                            }
                                            if (!sameNameSet.contains(realName)) {
                                                nameList.add(realName.replace(" ", ""));
    //                                            nameSet.add(realName);
                                            } else {
    //                                            nameList.add(realName + userId);
                                                if (StringUtils.isNotEmpty(studentGroupDto1.getMobile()) && studentGroupDto1.getMobile().length() == 11) {
                                                    nameList.add(realName + studentGroupDto1.getMobile().substring(7,11));
                                                }
                                            }
    
                                            pictureList.add(CommonConstants.staticImageServer + userCertificate.getIdentityPhoto());
                                        }
                                    }
    //                                else {
    //                                    pictureList.add(CommonConstants.contextPath + "/static/edu/images/zhengjian.jpg");
    //                                }
                                }
                            }
                        }
                    }
                    srcfile.add(file);
    
                    //导出图片
                    List<File> fileList = FileExportImportUtil.bufferImage(pictureList, picDir, nameList);
                    if (ObjectUtils.isNotNull(fileList)) {
                        for (File file1 : fileList) {
                            srcfile.add(file1);
                        }
                    }
                }
                FileExportImportUtil.createRar(response, dir, srcfile, expName);// 生成的多excel的压缩包
    
    
            } catch (Exception e) {
                logger.error("StudentGroupController.userGroupInfoExport", e);
                e.printStackTrace();
            }
    
        }

List<File> fileList = FileExportImportUtil.bufferImage(pictureList, picDir, nameList);
        if (ObjectUtils.isNotNull(fileList)) {
           for (File file1 : fileList) {
                srcfile.add(file1);
           }
        }

导出png/jpeg格式的图片，如果png的不单独处理容易造成图片的模糊和失真

/**
         * @Description:生成图片
         *
         * @Param: [picList, dir]
         * @Return: java.io.File
         *
         */
        public static List<File> bufferImage(List<String> picList, String dir, List<String> nameList) throws Exception {
    
            List<File> fileList = new ArrayList<>();
            for (int i = 0; i < picList.size(); i++) {
                File file2 = new File(picList.get(i).toString());
                String tile = file2.getName();//获取图片名称
                String picUrl = dir + "/" +i+ tile;
    
                URL url = new URL(picList.get(i).toString());//声明url对象
                URLConnection connection = url.openConnection();
                String message = connection.getHeaderField(0);
                boolean b = false;
                if (StringUtils.isNotEmpty(message)) {
                    if (message.indexOf("200") > -1) {
                        b = true;
                        URL url1 = new URL(picList.get(i).toString());//声明url对象
                        System.out.println("url =======================" + picList.get(i).toString());
                        URLConnection connection1 = url1.openConnection();
                        connection1.setDoOutput(true);
                        BufferedImage src = ImageIO.read(connection1.getInputStream());
    
                        File file1 = new File(picUrl);
                        if (picUrl.contains(".png") || picUrl.contains(".PNG")) {
                            ImageIO.write(src, "PNG", file1);
                        } else {
                            ImageIO.write(src, "JPEG", file1);
                        }
    
                        String path = file1.getAbsolutePath();
                        for (int j = 0; j < nameList.size(); j++) {
                            if (i == j) {
                                String name = file1.getName();
                                String path1 = path.substring(0, path.length() - name.length() - 1);
                                File file3;
                                if (picUrl.contains(".png") || picUrl.contains(".PNG")) {
                                    file3 = new File(path1 + "/" + nameList.get(j) + ".png");
                                } else {
                                    file3 = new File(path1 + "/" + nameList.get(j) + ".jpg");
                                }
    
                                if (file3.exists()) {
                                    file3.delete();
                                }
                                file1.renameTo(file3);
                                fileList.add(file3);
                            }
                        }
                    }
                }
                if (!b) {
                    continue;
                }
            }
            return fileList;
        }

引入依赖

<dependency>
    	<groupId>com.twelvemonkeys.imageio</groupId>
    	<artifactId>imageio-jpeg</artifactId>
    	<version>3.3.2</version>
    </dependency>