java 导入Excel -- 套路及代码分析

 1 var actionPath = contextPath + "/alumni-import";
 2 
 3 $(function() {
 4     //加载数据
 5     loadData();
 6     //上传文件
 7     uploadFile({
 8         subfix: [‘xls‘],
 9         subfixTip: "请选择Excel的xls文件！",
10         successCall: function(data, status, a) {
11             $(‘[name=attachementPath]‘).val(data.fileName);
12             $.post(actionPath + "!importExcel", { "f_id": data.f_id }, function(data) {
13                 if (data.success) {
14                     alertify.alert(data.message);
15                     $("#myModal-import").modal("hide");
16                     loadData();
17                 } else {
18                     alertify.alert(data.message);
19                 }
20 
21             }, "json");
22         }
23     });
24     //导入
25     $("#btn-import").click(function() {
26         var html = template("importTpl");
27         $("#import-body").html(html);
28         $("#myModal-import").modal();
29     });
30     //确认导入
31     $("#btn-sure").click(function() {
32         var type = $("#indentity-type").val();
33         alertify.confirm("确定要全部导入吗？", function(e) {
34             if (!e) { return; } else {
35                 $.post("/alumni-import!saveReal?type=" + type, function(data) {
36                     alertify.alert("导入成功!", function() {
37                         location.href = "/alumni!hrefPage";
38                     });
39                 }, "json");
40             }
41         });
42     });
43 });50 
51 function loadData() {
52     var options = {
53         url: actionPath + "!page"
54     };
55     loadPaginationData(options);
56 }

 1     //上传文件后调用
 2     public void importExcel() {
 3         try {
 4             //清空临时表的数据
 5             baseAlumniImportSrv.deleteAll();
 6             //读取文件
 7             File file = gridFsDao.readFile(f_id);
 8             //把文件信息给临时表
 9             int count = excelXYSrv.importExcel(file);
10             //清空上传的文件
11             file.delete();
12             sendSuccessMsg(count, "上传成功" + count + "条数据");
13         } catch (IOException e) {
14             LOGGER.error(e);
15             sendFailMsg(null, "上传失败");
16         }
17     }

 1     @Override    //使用MongoDB GridFS，具体详解请各自初学者自行百度，注释写不下去了，我也不会，心态爆炸~~~
 2     public File readFile(String f_id) {
 3         //拿到文件
 4         GridFSDBFile gridFSFile = mongoGridFs.findOne(new Query(Criteria.where(F_ID).is(f_id)));
 5         if (gridFSFile == null) {
 6             return null;
 7         }
 8         String fileName = gridFSFile.getFilename();
 9         String extension = fileName.substring(fileName.lastIndexOf("."), fileName.length());
10         InputStream ins = gridFSFile.getInputStream();
11         String tmpFile = UUID.randomUUID().toString() + extension;
12         File file = new File(tmpFile);
13 　　　　　
14         try {
15             OutputStream os = new FileOutputStream(file);
16             int bytesRead = 0;
17             byte[] buffer = new byte[8192];
18             while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {
19                 os.write(buffer, 0, bytesRead);
20             }
21             os.close();
22             ins.close();
23         } catch (IOException e) {
24             e.printStackTrace();
25         }
26 
27         return file;
28 
29     }

 1     /**
 2      * @param excelFile
 3      *            从excel中读取数据，并存储到数据库临时表中
 4      * @return
 5      * @throws IOException
 6      */
 7     @Override
 8     public int importExcel(File excelFile) throws IOException {
 9         List<List<Object>> datas = ExcelImportUtil.readExcel(excelFile);
10         int count = 0;
11         for (int i = 1; i < datas.size(); i++) {
12             BaseAlumniImport entity = this.convert2Entity(datas.get(i));
13             this.baseAlumniImportSrv.save(entity);
14             count++;
15         }
16         return count;
17     }

 1     public void saveReal() {
 2         int count = 0;
 3         List<BaseAlumniImport> importList = this.baseAlumniImportSrv.findAll();
 4         for (int i = 0; i < importList.size(); i += 10) {
 5             List<BaseAlumniImport> newlist = new ArrayList<>();
 6             if ((i + 10) < importList.size()) {
 7                 newlist = importList.subList(i, i + 10);
 8             } else {
 9                 newlist = importList.subList(i, importList.size());
10             }
11             count += excelXYSrv.saveReal(newlist, this.type);
12         }
13         sendSuccessMsg(count, "导入成功" + importList.size() + "条数据");
14     }

 1     @Override
 2     public int saveReal(List<BaseAlumniImport> importList, String type) {
 3         int count = 0;
 4         String alumniIdentityName = dicSrv.findById(DicAlumniIdentity.class, Integer.parseInt(type)).getValue();
 5         for (BaseAlumniImport inst : importList) {
 6             LOGGER.info(inst.getId());
 7             BaseAlumni v = this.importExportSrv.convert(inst);
 8             v.setId(IdKit.uuid());
 9             v.setCreateTime(new Date());
10             v.setLastUpdate(new Date());
11             this.baseAlumnidDao.save(v);
12             this.baseAlumniImportSrv.deleteById(inst.getId());
13             count++;
14         }
15         return count;
16     }

 1     @Override
 2     public int saveReal(List<BaseAlumniImport> importList, String type) {
 3         int count = 0;
 4         String alumniIdentityName = dicSrv.findById(DicAlumniIdentity.class, Integer.parseInt(type)).getValue();
 5         for (BaseAlumniImport inst : importList) {
 6             LOGGER.info(inst.getId());
 7             BaseAlumni v = this.importExportSrv.convert(inst);
 8             v.setId(IdKit.uuid());
 9             v.setCreateTime(new Date());
10             v.setLastUpdate(new Date());
11             this.baseAlumnidDao.save(v);
12             this.baseAlumniImportSrv.deleteById(inst.getId());
13             count++;
14         }
15         return count;
16     }