注意所有的编码都改成utf-8

同上传一样

新建一个FileInfo类 来接受前端的信息

import java.io.Serializable;

import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;
@Component
public class FileInfo implements Serializable {
    private static final long serialVersionUID = 1L;
    private MultipartFile file;

    public MultipartFile getFile() {
        return file;
    }

    public void setFile(MultipartFile file) {
        this.file = file;
    }

}

Controller

    
     // 文件下载
    @GetMapping(value="/download")
    public ResponseEntity<byte[]> download(HttpServletRequest request,@RequestParam("filename") String filename) throws Exception{
        // 下载路径
        String path = request.getServletContext().getRealPath("/file/");
        File file = new File(path+File.separator+filename);
        HttpHeaders headers = new HttpHeaders();
        // 解决中文乱码
        String downloadfile =  new String(filename.getBytes("UTF-8"),"iso-8859-1");
        // 以下载方式打开文件
        headers.setContentDispositionFormData("attachment", downloadfile);
        // 二进制流
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);

        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers,HttpStatus.CREATED);

    }

html

<a href="download?filename=${fileinfo.file.originalFilename }">${fileinfo.file.originalFilename}</a>