一、配置文件
Spring#上传文件使用servlet:multipart:#单个文件最大上传大小max-file-size: 10MB#每次请求上传文件大小最大值max-request-size: 30MB
#自定义参数
define:nginx:path: D:\uploadFile\
二、service层
public interface FileService {void saveFile(byte[] file, String filePath, String fileName) throws Exception;void download(HttpServletResponse response, String filename, Model model);
}
三、serviceImpl层
@Service
public class FileServiceImpl implements FileService {private static final String UTF_8 = "UTF-8";@Value("${define.nginx.path}")private String nginxPath;@Overridepublic void saveFile(byte[] file, String filePath, String fileName) throws Exception {File targetFile = new File(filePath);if (!targetFile.exists()) {targetFile.mkdirs();}FileOutputStream out = new FileOutputStream(filePath + fileName);out.write(file);out.flush();out.close();}@Overridepublic void download(HttpServletResponse response, String filename, Model model) {response.setContentType("application/force-download");response.setCharacterEncoding(UTF_8);// 设置下载后的文件名以及headerresponse.addHeader("Content-disposition", "attachment;fileName=" + URLEncoder.encode(filename));byte[] buff = new byte[1024];//创建缓冲输入流BufferedInputStream bis = null;OutputStream outputStream = null;try {outputStream = response.getOutputStream();//这个路径为待下载文件的路径bis = new BufferedInputStream(new FileInputStream(new File(nginxPath + filename )));int read = bis.read(buff);//通过while循环写入到指定了的文件夹中while (read != -1) {outputStream.write(buff, 0, buff.length);outputStream.flush();read = bis.read(buff);}} catch ( IOException e ) {e.printStackTrace();//出现异常返回给页面失败的信息System.out.println("--------------------------------");model.addAttribute("result","下载失败");} finally {if (bis != null) {try {bis.close();} catch (IOException e) {e.printStackTrace();}}if (outputStream != null) {try {outputStream.close();} catch (IOException e) {e.printStackTrace();}}}}
}
四、controller层
@Api(tags = {"文件上传下载"})
@Controller
@RequestMapping("/upload")
public class UploadController {private static final String NULL_FILE = "";@Value("${define.nginx.path}")private String nginxPath;@Autowiredprivate FileService fileService;@GetMapping(value = "/goToUpload")public String goToUploadHtml() {return "upload";}@ApiOperation("单文件上传")@PostMapping("/uploadFile")@ResponseBodypublic String singleFileUpload(@RequestParam("file") MultipartFile file) {try {if (file == null || NULL_FILE.equals(file.getOriginalFilename())) {return "upload failure";}fileService.saveFile(file.getBytes(), nginxPath, file.getOriginalFilename());} catch (Exception e) {return "upload failure";}return "upload success";}@ApiOperation("批量文件上传")@PostMapping("/uploadFiles")@ResponseBodypublic String multiFileUpload(@RequestParam("file") MultipartFile[] files) {try {for (int i = 0; i < files.length; i++) {//check fileif (NULL_FILE.equals(files[i].getOriginalFilename())) {continue;}fileService.saveFile(files[i].getBytes(), nginxPath, files[i].getOriginalFilename());}} catch (Exception e) {return "upload failure";}return "upload success";}@ApiOperation("文件下传")@PostMapping("/download")@ApiImplicitParams({@ApiImplicitParam(value = "文件名",name = "fileName",dataType = "string")})public void testDownload(HttpServletResponse response,String fileName , Model model) {fileService.download(response,fileName,model);//成功后返回成功信息model.addAttribute("result","下载成功");}}
五、页面
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>SpringBoot上传文件</title>
</head>
<body>
<!--单文件上传-->
<form enctype="multipart/form-data" method="post" action="http://localhost:8080/upload/uploadFile">图片：<input type="file" name="file"/><input type="submit" value="上传"/>
</form>
<!--批量文件上传-->
<form enctype="multipart/form-data" method="post" action="http://localhost:8080/upload/uploadFiles">图片：<input type="file" name="file"/><br>图片：<input type="file" name="file"/><br>图片：<input type="file" name="file"/><br><input type="submit" value="上传全部"/>
</form>
<!--文件下载-->
<form action="http://localhost:8080/upload/download" method="post"><p><h1>下载文件</h1></p><p><h2>1.png</h2></p><p><input type="submit" value="下载"/></p>
</form>
</body>
</html>
