UploadController.java

package com.kyungjoon777.test.com;


import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

@Controller
public class UploadController {


    @GetMapping("/index")
    public String test(Model model) {

        model.addAttribute("kyungjoon", "kyungjoon is genius");

        return "index";
    }

    @PostMapping("/upload")
    @ResponseStatus(HttpStatus.CREATED)
    public ModelAndView upload(
            @RequestPart List<MultipartFile> reg_file,
            @RequestParam(value = "name", required = true) String name,
            @RequestParam(value = "nickname", required = true) String nickname
    )
            throws Exception {
        List<String> list = new ArrayList<>();
        int index = 0;
        for (MultipartFile file : reg_file) {
            String originalfileName = file.getOriginalFilename();
            String newFileName = "reg_file_" + index + "." + originalfileName.split("\\.")[1];
            File dest = new File("/Users/gilzako/java_pjt/uploaddemo/images/" + newFileName);
            file.transferTo(dest);
            index++;
        }

        ModelAndView model = new ModelAndView();
        model.setViewName("jsonView");
        model.addObject("result", "upload complete");
        return model;
    }

}