一：上传
方式一：通过request请求获取解析
1.web部分。

html:
<form>
    <div class="form-group col-lg-2" th:if="${session.permissions.hotelAdd}">
         <input id="fileUpload" accept="application/vnd.sealed-xls" type="file">
    </div>
<form>
js:
  //初始化文件上传
        $('#fileUpload').fileinput({
            uploadUrl: '/project/getFlieListHotExecl',
            dropZoneEnabled: false,
            allowedFileTypes: ['xls', 'xlsx'],
            maxFileCount: 1,
            maxFileSize:10240,
            language: 'zh'
        }).on("filebatchselected", function (event, files) {
            $(this).fileinput("upload");
        }).on("fileuploaded", function (event, data) {
            $('#blogTable').bootstrapTable('refresh');
        });

2:java部分。

@RequestMapping("/getFlieListHotExecl")
@ResponseBody
public void fileUpload(HttpServletRequest request) {
    MultipartFile file = null;
    // 创建一个通用的多部分解析器
    CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
    // 判断 request 是否有文件上传,即多部分请求
    if (multipartResolver.isMultipart(request)) {
        // 转换成多部分request
        MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
        // 取得request中的所有文件名
        Iterator<String> iter = multiRequest.getFileNames();
        while (iter.hasNext()) {
             file = multiRequest.getFile(iter.next());
        }
    }
    //解析
    if (null!=file){
        // 创建输入流，读取流
        try {
            InputStream is = file.getInputStream();
            //处理流
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

方式二：spring boot 项目
1.web部分。

html:
 <form action="fileUpload" method="post" enctype="multipart/form-data">
    <p>选择文件: <input type="file" name="fileName"/></p>
    <p><input type="submit" value="提交"/></p>
</form>

2.java部分。

@RequestMapping("/fileUpload")
@ResponseBody
public void fileUpload(@RequestParam("fileName") MultipartFile file){
    //解析
    if (null!=file){
        // 创建输入流，读取流
        try {
            InputStream is = file.getInputStream();
            //处理流
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

三：上传多文件
htlm:

<form action="multifileUpload" method="post" enctype="multipart/form-data" >
       <p>选择文件1: <input type="file" name="fileName"/></p>
       <p>选择文件2: <input type="file" name="fileName"/></p>
       <p>选择文件3: <input type="file" name="fileName"/></p>
       <p><input type="submit" value="提交"/></p>
</form>

java:

@RequestMapping(value = "/batch/upload", method = RequestMethod.POST)
@ResponseBody
public void handleFileUpload(HttpServletRequest request) {
    MultipartHttpServletRequest params=((MultipartHttpServletRequest) request);
    List<MultipartFile> files = ((MultipartHttpServletRequest) request)
            .getFiles("file");
    String name=params.getParameter("name");
    System.out.println("name:"+name);
    String id=params.getParameter("id");
    System.out.println("id:"+id);
    MultipartFile file = null;
    BufferedOutputStream stream = null;
    for (int i = 0; i < files.size(); ++i) {
        file = files.get(i);
        //解析
    }
}

二：解析
1.解析excel

public static List<T> getExeclObject(MultipartFile file,List<T> T) {
        try {
            // 创建输入流，读取Excel
            InputStream is = file.getInputStream();
            // jxl提供的Workbook类
            Workbook wb = Workbook.getWorkbook(is);
            // Excel的页签数量
            int sheet_size = wb.getNumberOfSheets();
            for (String str : wb.getSheetNames()) {
                System.out.println("===========str==========" + str);
            }
            for (int index = 0; index < sheet_size; index++) {
                // 获得页签名称
                Sheet sheet = wb.getSheet(index);
                for (int i = 1; i < sheet.getRows(); i++) {
                    T t = new T();
                    // 对t赋值
                    if (!StringUtil.isEmpty(sheet.getCell(0, i).getContents())) {
                        sheet.getCell(0, i).getContents();//第i行，第1列数据
                        sheet.getCell(1, i).getContents();//第i行，第2列数据
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return T;
    }