SpringMVC之文件上传和下载

@RequestMapping("/testDown")
publicResponseEntity<byte[]>testResponseEntity(HttpSessionsession) throwsIOException {
//获取ServletContext对象ServletContextservletContext=session.getServletContext();
//获取服务器中文件的真实路径StringrealPath=servletContext.getRealPath("/static/img/1.jpg");
//创建输入流InputStreamis=newFileInputStream(realPath);
//创建字节数组byte[] bytes=newbyte[is.available()];
//将流读到字节数组中is.read(bytes);
//创建HttpHeaders对象设置响应头信息MultiValueMap<String, String>headers=newHttpHeaders();
//设置要下载方式以及下载文件的名字headers.add("Content-Disposition", "attachment;filename=1.jpg");
//设置响应状态码HttpStatusstatusCode=HttpStatus.OK;
//创建ResponseEntity对象ResponseEntity<byte[]>responseEntity=newResponseEntity<>(bytes, headers, statusCode);
//关闭输入流is.close();
returnresponseEntity;
}

@RequestMapping("/testUp")
publicStringtestUp(MultipartFilephoto, HttpSessionsession) throwsIOException {
//获取上传的文件的文件名StringfileName=photo.getOriginalFilename();
//处理文件重名问题StringhzName=fileName.substring(fileName.lastIndexOf("."));
fileName=UUID.randomUUID().toString() +hzName;
//获取服务器中photo目录的路径ServletContextservletContext=session.getServletContext();
StringphotoPath=servletContext.getRealPath("photo");
Filefile=newFile(photoPath);
if(!file.exists()){
file.mkdir();
    }
StringfinalPath=photoPath+File.separator+fileName;
//实现上传功能photo.transferTo(newFile(finalPath));
return"success";
}