上传下载到本地

package com.cqyy.oa.web.controller;

import com.cqyy.oa.common.base.BaseResponse;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

@Api(tags = "上传下载文档")
@RestController
@RequestMapping("file")
public class FileController {

    /**
     * 上传图片
     *
     * @param file
     * @throws IOException
     */
    @ApiOperation(value = "上传图片接口",notes = "上传图片")
    @RequestMapping(value = "upload", method = RequestMethod.POST)
    public BaseResponse upload(@RequestParam("file") MultipartFile file) throws IOException {
        String fileName = file.getOriginalFilename();
        String name = fileName.substring(0,fileName.lastIndexOf("."));

        /*String fileName = UUID.randomUUID().toString();*/
        String ext = StringUtils.getFilenameExtension(file.getOriginalFilename());
        if (StringUtils.isEmpty(ext)) {
            ext = "png";
        }
       /* FTPUtils.uploadFile(name+"."+ext, "D:/file/"+name+"."+ext);*/
        /*boolean flag = FTPUtils.downFile("ftp://172.16.3.16/hhl.png", "D:/file/hhl.png");*/
        /*file.transferTo(new File("f://file/" + name + "." + ext));*/
        BaseResponse baseResponse = new BaseResponse();
        baseResponse.setMessage(name);
        return baseResponse;
    }


    /**
     * 文件流
     *
     * @param response
     * @return
     */
    @ApiOperation(value = "下载文件接口",notes = "下载文件")
    @RequestMapping(value = "stream/{fileName}/{ext}", method = RequestMethod.GET)
    public String thumbnail(HttpServletResponse response, @PathVariable("fileName") String fileName, @PathVariable("ext") String ext) {
        try {
            InputStream inputStream = new FileInputStream("f://file/" + fileName + "." + ext);
            OutputStream os = response.getOutputStream();
            response.reset();
            response.setContentType("bin");
            response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName+ "." + ext + "\"");
            byte[] b = new byte[1024];
            int length;
            while ((length = inputStream.read(b)) > 0) {
                os.write(b, 0, length);
            }
            // 这里主要关闭。
            os.close();
            inputStream.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}