spring cloud feign 文件上传和文件下载

import feign.codec.Encoder;
import feign.form.spring.SpringFormEncoder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class FeignMultipartSupportConfig {
    @Bean
    public Encoder feignFormEncoder() {
        return new SpringFormEncoder();
    }
}　　

     <!--feign upload file-->
        <dependency>
            <groupId>io.github.openfeign.form</groupId>
            <artifactId>feign-form</artifactId>
            <version>3.0.3</version>
        </dependency>
        <dependency>
            <groupId>io.github.openfeign.form</groupId>
            <artifactId>feign-form-spring</artifactId>
            <version>3.0.3</version>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.3</version>
        </dependency>　　

   @PostMapping(value = "upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public R upload(MultipartFile file) {
        try {
            String fileName = file.getOriginalFilename();
            fileName = FileUtils.renameToUUID(fileName);
            String resPath = FileUtils.saveFile(file.getBytes(), filePath, fileName);
//            fileService.save(new FileDO() {{
//                setCreateDate(new Date());
//                setUrl("http://localhost:8004" + filePre + "/"+resPath);
//                setType(1);
//            }});
            return R.ok().put("resPath", resPath);
        } catch (IOException e) {
            e.printStackTrace();
            return R.error("文件上传失败");
        }
    }

    @GetMapping("/download")
    public void downLoad(HttpServletResponse response) throws IOException {
　　　　//这里示意下载excel文件，自己随便下载点东西
　　　　
        /*我们先定义一个嵌套的List，List的元素也是一个List，内层的一个List代表一行数据，
        每行都有4个单元格，最终list对象代表多行数据。*/

        List<String> row1 = CollUtil.newArrayList("aa", "bb", "cc", "dd");
        List<String> row2 = CollUtil.newArrayList("aa1", "bb1", "cc1", "dd1");
        List<String> row3 = CollUtil.newArrayList("aa2", "bb2", "cc2", "dd2");
        List<String> row4 = CollUtil.newArrayList("aa3", "bb3", "cc3", "dd3");
        List<String> row5 = CollUtil.newArrayList("aa4", "bb4", "cc4", "dd4");

        List<List<String>> rows = CollUtil.newArrayList(row1, row2, row3, row4, row5);
        // 然后我们创建ExcelWriter对象后写出数据：

        // 通过工具类创建writer，默认创建xls格式
        ExcelWriter writer = ExcelUtil.getWriter();
        // 一次性写出内容，使用默认样式
        writer.write(rows);
        //out为OutputStream，需要写出到的目标流

        //response为HttpServletResponse对象
        response.setContentType("application/vnd.ms-excel;charset=utf-8");
        //test.xls是弹出下载对话框的文件名，不能为中文，中文请自行编码
        response.setHeader("Content-Disposition", "attachment;filename=test.xls");
        ServletOutputStream out = response.getOutputStream();

        writer.flush(out);
        // 关闭writer，释放内存
        writer.close();

    }

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.UUID;

public class FileUtils {
    public static String saveFile(byte[] file, String filePath, String fileName) {
        int random = (int) (Math.random() * 100 + 1);
        int random1 = (int) (Math.random() * 100 + 1);
        filePath = filePath + random + File.separator + random1 + File.separator;
        File targetFile = new File(filePath);
        if (!targetFile.exists()) {
            targetFile.mkdirs();
        }
        FileOutputStream fileOutputStream = null;
        try {
            fileOutputStream = new FileOutputStream(filePath + fileName);
            FileChannel fileChannel = fileOutputStream.getChannel();
            ByteBuffer buf = ByteBuffer.wrap(file);
            while (fileChannel.write(buf) != 0) {
            }
        } catch (Exception e) {

        } finally {
            if (fileOutputStream != null) {
                try {
                    fileOutputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        //url
        return random + "/" + random1 + "/" + fileName;
    }

    public static boolean deleteFile(String fileName) {
        File file = new File(fileName);
        // 如果文件路径所对应的文件存在，并且是一个文件，则直接删除
        if (file.exists() && file.isFile()) {
            if (file.delete()) {
                return true;
            } else {
                return false;
            }
        } else {
            return false;
        }
    }

    public static String renameToUUID(String fileName) {
        return UUID.randomUUID() + "." + fileName.substring(fileName.lastIndexOf(".") + 1);
    }
}