Angularjs + springmvc upload and download

Jsp:

<form ng-submit="uploadFile()" class="form-horizontal" enctype="multipart/form-data">
                <input type="file" name="file" ng-model="document.fileInput" id="file" onchange="document.getElementById(‘filepath‘).value=this.value;" />
                <input  name=‘filepath‘ id=‘filepath‘>
                <button class="btn btn-primary" type="submit">
                    Submit
                </button>
            </form>

Js:

$scope.uploadFile=function(){
            var formData=new FormData();
            formData.append("file",file.files[0]);
            $http.post(VX.CONFIG.rootPath+‘/uploadFile‘, formData, {
                transformRequest: function(data, headersGetterFunction) {
                    return data;
                },
                headers: { ‘Content-Type‘: undefined }
            }).success(function(data, status) {
                console.log(data);
                console.log("Success ... " + status);
            }).error(function(data, status) {
                console.log("Error ... " + status);
                console.log(data);
            });
            };

Java:

Package com.nirvanainfo.salesleads.api.controller.common;

Import com.nirvanainfo.salesleads.api.utils.Global;
Import com.nirvanainfo.salesleads.api.utils.ImageHandleUtill;
Import com.nirvanainfo.salesleads.api.utils.ResultBean;
Import com.nirvanainfo.salesleads.api.utils.ResultPageBean;
Import com.nirvanainfo.salesleads.service.convert.CsvUtil;
Import org.apache.commons.fileupload.FileItem;
Import org.apache.commons.fileupload.FileItemFactory;
Import org.apache.commons.fileupload.FileUpload;
Import org.apache.commons.fileupload.disk.DiskFileItemFactory;
Import org.apache.commons.fileupload.servlet.ServletFileUpload;
Import org.apache.commons.logging.Log;
Import org.apache.commons.logging.LogFactory;
Import org.json.simple.JSONObject;
Import org.springframework.stereotype.Controller;
Import org.springframework.web.bind.annotation.RequestMapping;
Import org.springframework.web.bind.annotation.RequestParam;
Import org.springframework.web.bind.annotation.ResponseBody;
Import org.springframework.web.multipart.MultipartFile;

Import javax.imageio.ImageIO;
Import javax.servlet.http.HttpServletRequest;
Import javax.servlet.http.HttpServletResponse;
Import java.awt.image.BufferedImage;
Import java.io.File;
Import java.io.FileInputStream;
Import java.io.IOException;
Import java.io.PrintWriter;
Import java.text.NumberFormat;
Import java.text.SimpleDateFormat;
Import java.util.*;

/**
 * Created by Choice on 2016/4/25.
 */
@Controller
@RequestMapping("uploadFile")
Public class UploadFileController extends BaseController{

    Private static Log log = LogFactory.getLog(UploadFileController.class);

    @RequestMapping("")
    Public @ResponseBody Object UploadFile(@RequestParam(value="file", required=true) MultipartFile file, HttpServletRequest request, HttpServletResponse response) {
        PrintWriter out = null;
        Try {

            / / File save directory path
            String savePath = Global.getUploadPath() + "";

            / / File save directory URL
            String saveUrl = "/";

            / / Define the file extension allowed to upload
            HashMap<String, String> extMap = new HashMap<String, String>();
            extMap.put("file", "xls,xlsx,csv");

            //Maximum file size
            Long maxSize = 20*1024*1024;

            response.setContentType("text/html; charset=UTF-8");
            Out = response.getWriter();

            / / Get the community personal file directory
            String permissionsDir = "";

            If(!ServletFileUpload.isMultipartContent(request)){
                Return new ResultBean<>(201, "Please select a file.");
            }
            / / Check the directory
            File uploadDir = new File(savePath);
            If (!uploadDir.exists()) {
                uploadDir.mkdirs();
            }

            String dirName = request.getParameter("dir");
            If (dirName == null) {
                dirName = "file";
            }
            / / Create a folder
            savePath += permissionsDir.length() > 0 ? permissionsDir + "/" + dirName + "/" : "/" + dirName + "/";
            saveUrl += permissionsDir.length() > 0 ? permissionsDir + "/" + dirName + "/": "/" + dirName + "/";
            File saveDirFile = new File(savePath);
            If (!saveDirFile.exists()) {
                saveDirFile.mkdirs();
            }
            SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
            String ymd = sdf.format(new Date());
            savePath += ymd + "/";
            saveUrl += ymd + "/";
            File dirFile = new File(savePath);
            If (!dirFile.exists()) {
                dirFile.mkdirs();
            }

            If (dirName.equals("file")) {
                file.transferTo(new File(savePath+file.getOriginalFilename()));
                System.out.println(savePath+file.getOriginalFilename());
                CsvUtil util = new CsvUtil(savePath+file.getOriginalFilename());
                Int rowNum = util.getRowNum();
                Int colNum = util.getColNum();
                If(rowNum<=101){
                    Boolean delResult=deleteFile(savePath+file.getOriginalFilename());
                    If(delResult){
                        Log.info("del success");
                    }else{
                        Log.info("del fail");
                    }
                    Return new ResultBean<>(201, "The content of the file should be at least 100.");
                }
                List<String> columns=new ArrayList<String>();
                For(int j=0;j<colNum;j++){
                    String key=null;
                    Key=util.getString(0, j);
                    Columns.add(key);
                }
                System.out.println(columns);
                Boolean result=true;
                If(result){
                    Result=columns.contains("FirstName");
                    If(result){
                        Result=columns.contains("LastName");
                        If(result){
                            Result=columns.contains("Company");
                            If(result){
Result=columns.contains("Address1");
                                If(result){
                                    Result=columns.contains("City");
                                    If(result){
                                        Result=columns.contains("State");
                                        If(result){
                                            Result=columns.contains("Zip");
                                            If(result){
                                                Result=columns.contains("Email");
                                                If(result){
                                                    Result=columns.contains("Phone");
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }

                If(!result){
                    Boolean delResult=deleteFile(savePath+file.getOriginalFilename());
                    If(delResult){
                        Log.info("del success");
                    }else{
                        Log.info("del fail");
                    }
                    Return new ResultBean<>(201, "File must contain the following columns: FirstName, LastName, Company, Address1, City, State, Zip, Email, Phone.");
                }

            }
        } catch (Exception e) {
            Return new ResultBean<>(300, "fail");
        }
        Return new ResultBean<>(200, "success");
    }


    Private static boolean deleteFile(String path){
        Boolean del=false;
        File file=new File(path);
        If(file.isFile()){
            File.delete();
            Del=true;
        }
        Return del;
    }
}  

Java upload Download reference: http://www.cnblogs.com/lcngu/p/5471610.html

Angularjs + springmvc upload and download