springboot如何实现文件上传与下载？

Hmll表单上传文件

控制器

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

import javax.servlet.http.COOKIE;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.net.http.HttpResponse;
import java.util.List;

@Controller
public class HelloController {
 
    @GetMapping("/multiUpload")
    public String multiUpload() {
        return "multiUpload";
    }

    @PostMapping("/multiUpload")
    @ResponseBody
    public String multiUpload(HttpServletRequest request) {
        List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");
        String file...

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