MultipartFile中transferTo(File file)的路径问题及解决

 @ResponseBody @RequestMapping("/upload") public Map upload(HttpServletRequest request,MultipartFile file){ HashMap map=new HashMap(); if (!file.isEmpty()) { try { // getOriginalFilename()是包含源文件后缀的全名 String filePath = "D:/upload/test/"+file.getOriginalFilename(); System.out.println(filePath); File saveDir = new File(filePath); if (!saveDir.getParentFile().exists()) saveDir.getParentFile().mkdirs(); file.transferTo(saveDir); map.put("res","上传成功"); return map; } catch (Exception e) { e.printStackTrace(); } } map.put("res","上传失败"); return map; }

 String filePath = "D:/upload/test/"+file.getOriginalFilename();

 String filePath = "D:/upload/test";

 
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 /** * 使用 httpServletRequest作为参数 * @param  httpServletRequest * @return */ @PostMapping("/upload") @ResponseBody public Map upload(HttpServletRequest httpServletRequest){ boolean flag = false; MultipartHttpServletRequest multipartHttpServletRequest = null; //强制转换为MultipartHttpServletRequest接口对象 (它包含所有HttpServletRequest的方法) if(httpServletRequest instanceof MultipartHttpServletRequest){ multipartHttpServletRequest = (MultipartHttpServletRequest) httpServletRequest; }else{ return dealResultMap(false, "上传失败"); } //获取MultipartFile文件信息(注意参数为前端对应的参数名称) MultipartFile mf = multipartHttpServletRequest.getFile("file"); //获取源文件名称 String fileName = mf.getOriginalFilename(); //存储路径可在配置文件中指定 File pfile = new File("D:/fileupload1/"); if (!pfile.exists()) { pfile.mkdirs(); } File file = new File(pfile,  fileName); /* //指定好存储路径 File file = new File(fileName);*/ try { //保存文件 //使用此方法保存必须要绝对路径且文件夹必须已存在,否则报错 mf.transferTo(file); } catch (IOException e) { e.printStackTrace(); return dealResultMap(false, "上传失败"); } return dealResultMap(true, "上传成功"); } /** * 使用Spring MVC的multipartFile 类作为参数 * * @param multipartFile * @return */ @PostMapping("/upload/MultipartFile") @ResponseBody public Map uploadMultipartFile(@RequestParam("file") MultipartFile multipartFile){ String fileName = multipartFile.getOriginalFilename(); try { //获取文件字节数组 byte [] bytes = multipartFile.getBytes(); //文件存储路径(/fileupload1/ 这样会在根目录下创建问价夹) File pfile = new File("/fileupload1/"); //判断文件夹是否存在 if(!pfile.exists()){ //不存在时,创建文件夹 pfile.mkdirs(); } //创建文件 File file = new File(pfile, fileName); //写入指定文件夹 OutputStream out = new FileOutputStream(file); out.write(bytes); } catch (IOException e) { e.printStackTrace(); return dealResultMap(false, "上传失败"); } /*//如果配置文件指定目录,就可以直接这样写(不指定路径的,就需要自己填充保存路径) File file = new File(fileName); try { //使用此方法保存必须要绝对路径且文件夹必须已存在,否则报错 multipartFile.transferTo(file); } catch (IOException e) { e.printStackTrace(); return dealResultMap(false, "上传失败"); }*/ return dealResultMap(true, "上传成功"); } @PostMapping("/upload/part") @ResponseBody public Map uploadPart(@RequestParam("file") Part part){ System.out.println(part.getSubmittedFileName()); System.out.println(part.getName()); //输入流 InputStream inputStream = null; try { inputStream = part.getInputStream(); } catch (IOException e) { e.printStackTrace(); return dealResultMap(false, "上传失败"); } //保存到临时文件 //1K的数据缓冲流 byte[] bytes = new byte[1024]; //读取到的数据长度 int len; //输出的文件保存到本地文件 File pfile = new File("/fileupload1/"); if (!pfile.exists()) { pfile.mkdirs(); } File file = new File(pfile, part.getSubmittedFileName()); OutputStream out; try { out = new FileOutputStream(file); //开始读取 while ((len = inputStream.read(bytes)) != -1){ out.write(bytes, 0, len); } } catch (FileNotFoundException e) { e.printStackTrace(); return dealResultMap(false, "上传失败"); } catch (IOException e) { e.printStackTrace(); return dealResultMap(false, "上传失败"); } /*//配置文件配置的有默认上传路径 //获取提交文件的名字 String fileName = part.getSubmittedFileName(); try { //使用此方法保存必须要绝对路径且文件夹必须已存在,否则报错 part.write(fileName); } catch (IOException e) { e.printStackTrace(); return dealResultMap(false, "上传失败"); }*/ return dealResultMap(true, "上传成功"); } 

 //1.使用此方法保存必须指定盘符（在系统配置时要配绝对路径）; // 也可以通过 File f = new File(new File(path).getAbsolutePath()+ "/" + fileName); 取得在服务器中的绝对路径 保存即可 //      file.transferTo(f); //2.使用此方法保存可相对路径（/var/falcon/）也可绝对路径（D:/var/falcon/） byte [] bytes = file.getBytes(); OutputStream out = new FileOutputStream(f); out.write(bytes); 

 // 写一个Java Config @Configuration public class webMvcConfig implements org.springframework.web.servlet.config.annotation.WebMvcConfigurer{ // 定义在application.properties @Value("${file.upload.path}") private String path = "upload/"; public void addResourceHandlers(ResourceHandlerRegistry registry) { String p = new File(path).getAbsolutePath() + File.separator;//取得在服务器中的绝对路径 System.out.println("Mapping /upload/** from " + p); registry.addResourceHandler("/upload/**") // 外部访问地址 .addResourceLocations("file:" + p)// springboot需要增加file协议前缀 .setCacheControl(CacheControl.maxAge(30, TimeUnit.MINUTES));// 设置浏览器缓存30分钟 } } 

 @RestController @RequestMapping("/file") public class UploadFileController { @Autowired protected HttpServletRequest request; @Autowired protected HttpServletResponse response; @Autowired protected ConversionService conversionService; @Value("${file.upload.path}") private String path = "upload/"; @RequestMapping(value="/view", method = RequestMethod.GET) public Object view(@RequestParam("id") Integer id){ // 通常上传的文件会有一个数据表来存储，这里返回的id是记录id UploadFile file = conversionService.convert(id, UploadFile.class);// 这步也可以写在请求参数中 if(file==null){ throw new RuntimeException("没有文件"); } File source= new File(new File(path).getAbsolutePath()+ "/" + file.getPath()); response.setContentType(contentType); try { FileCopyUtils.copy(new FileInputStream(source), response.getOutputStream()); } catch (Exception e) { e.printStackTrace(); } return null; } }