微服务中的文件上传下载

https://blog.csdn.net/weixin_34235457/article/details/88231392

文件上传下载rest接口定义
import cn.hutool.core.io.FileUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.crypto.digest.DigestUtil;

@Api(value = "文件controller", tags = {"文件上传下载接口"})
@RestController
@RequestMapping("/file")
public class FileController{

private static final String SAVE_PATH = System.getProperty("user.home");
/**
* 上传文件
*
* @param file
* @return
*/
@ApiOperation(value = "上传文件")
@PostMapping("/upload")
public String upload(@NotNull MultipartFile file) {
//文件MD5值
String md5File = DigestUtil.md5Hex(file.getInputStream());
//文件后缀
String extName = StrUtil.subAfter(file.getOriginalFilename(), ".", true);
//文件如果不存在，则保存，否则直接返回文件的MD5名
File localFile = new File(SAVE_PATH, md5File)
if (!FileUtil.exist(localFile)) {
//创建一个新文件
File attachFile = FileUtil.touch(SAVE_PATH, md5File);
//将文件流写入文件中
FileUtil.writeFromStream(file.getInputStream(), attachFile);
return "文件上传成功"
}
return "文件已存在";
}



/**
* 文献下载
*
* @return
*/
@ApiOperation(value = "求助文件下载")
@ApiImplicitParam(name = "fileName", value = "文件名", dataType = "String", paramType = "query")
@GetMapping("/download")
public ResponseEntity download(@RequestParam String fileName) {
File file = new File(SAVE_PATH, fileName);
if (!file.exists()) {
return ResponseEntity.notFound().build();
}
HttpHeaders headers = new HttpHeaders();
headers.add("Cache-Control", "no-cache, no-store, must-revalidate");
//chrome浏览器下载文件可能出现：ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_DISPOSITION，
//产生原因：可能是因为文件名中带有英文半角逗号,
//解决办法：确保 filename 参数使用双引号包裹[1]
headers.add("Content-Disposition", "attachment; filename="" + file.getName()+""");
headers.add("Pragma", "no-cache");
headers.add("Expires", "0");
return ResponseEntity
.ok()
.headers(headers)
.contentLength(downloadModel.getDocFile().length())
.contentType(MediaType.parseMediaType("application/octet-stream"))
.body(new FileSystemResource(file));
}
}
restTemplat调用api上传
public void uploadFile(@NotNull MultipartFile file){
File newFile = FileUtil.writeFromStream(file.getInputStream(),"F:/upload/"+file.getOriginalFilename());
FileSystemResource fs =new FileSystemResource(newFile);
MultiValueMap<String, Object> param = new LinkedMultiValueMap<>();
//这里不能直接传参File或MultipartFile，需要用FileSystemResource包装一下
param.add("file",fs);
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.MULTIPART_FORM_DATA);
HttpEntity<MultiValueMap<String,Object>> httpEntity = new HttpEntity<>(param,headers);
ResponseEntity<String> responseEntity = new RestTemplate().exchange("http://cloud.test.hnlat.com/zuul/resources-server/file/upload", HttpMethod.POST, httpEntity,String.class);
String fileName = responseEntity.getBody().toString();
}
附：
[1]http://codeverge.com/embarcadero.delphi.intraweb/chrome-err_response_headers_multi/1061174
---------------------
作者：weixin_34235457
来源：CSDN
原文：https://blog.csdn.net/weixin_34235457/article/details/88231392
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