首先描述一下問題，spring boot 使用的是內(nèi)嵌的tomcat， 所以不清楚文件上傳到哪里去了， 而且spring boot 把靜態(tài)的文件全部在啟動的時(shí)候都會加載到classpath的目錄下的，所以上傳的文件不知相對于應(yīng)用目錄在哪，也不知怎么寫訪問路徑合適，對于新手的自己真的一頭霧水。
后面想起了官方的例子，沒想到一開始被自己找到的官方例子，后面太依賴百度谷歌了，結(jié)果發(fā)現(xiàn)只有官方的例子能幫上忙，而且?guī)蜕洗竺?，直接上密碼的代碼
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package hello; import static org.springframework.hateoas.mvc.ControllerLinkBuilder.linkTo; import static org.springframework.hateoas.mvc.ControllerLinkBuilder.methodOn; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Paths; import java.util.stream.Collectors; import javax.servlet.http.HttpServletRequest; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.core.io.ResourceLoader; import org.springframework.http.ResponseEntity; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.servlet.mvc.support.RedirectAttributes; @Controllerpublic class FileUploadController { private static final Logger log = LoggerFactory.getLogger(FileUploadController.class); public static final String ROOT = "upload-dir"; private final ResourceLoader resourceLoader; @Autowired public FileUploadController(ResourceLoader resourceLoader) { this.resourceLoader = resourceLoader; } @RequestMapping(method = RequestMethod.GET, value = "/") public String provideUploadInfo(Model model) throws IOException { model.addAttribute("files", Files.walk(Paths.get(ROOT)) .filter(path -> !path.equals(Paths.get(ROOT))) .map(path -> Paths.get(ROOT).relativize(path)) .map(path -> linkTo(methodOn(FileUploadController.class).getFile(path.toString())).withRel(path.toString())) .collect(Collectors.toList())); return "uploadForm"; } //顯示圖片的方法關(guān)鍵 匹配路徑像 localhost:8080/b7c76eb3-5a67-4d41-ae5c-1642af3f8746.png @RequestMapping(method = RequestMethod.GET, value = "/{filename:.+}") @ResponseBody public ResponseEntity<?> getFile(@PathVariable String filename) { try { return ResponseEntity.ok(resourceLoader.getResource("file:" + Paths.get(ROOT, filename).toString())); } catch (Exception e) { return ResponseEntity.notFound().build(); } } <strong>//上傳的方法</strong> @RequestMapping(method = RequestMethod.POST, value = "/") public String handleFileUpload(@RequestParam("file") MultipartFile file, RedirectAttributes redirectAttributes, HttpServletRequest request) { System.out.println(request.getParameter("member")); if (!file.isEmpty()) { try { Files.copy(file.getInputStream(), Paths.get(ROOT, file.getOriginalFilename())); redirectAttributes.addFlashAttribute("message", "You successfully uploaded " + file.getOriginalFilename() + "!"); } catch (IOException|RuntimeException e) { redirectAttributes.addFlashAttribute("message", "Failued to upload " + file.getOriginalFilename() + " => " + e.getMessage()); } } else { redirectAttributes.addFlashAttribute("message", "Failed to upload " + file.getOriginalFilename() + " because it was empty"); } return "redirect:/"; } } |
看完上面的代碼可以理解到spring boot 的存取文件思路了，存的時(shí)候的路徑為
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Paths.get(ROOT, filename).toString())) |
這個(gè)路徑會在本地的工程根目錄上創(chuàng)建，不應(yīng)用部署里的目錄，所以一般的訪問http訪問不可能 ，所以它提供了ResourceLoader,利于這個(gè)類可以加載非應(yīng)用目錄的里文件然后返回
所以就可以讀取文件，所以就要寫getFIle方法來顯示圖片
如果大家對spring boot不是很了解，大家可以參考下面兩篇文章。
以上所述是小編給大家介紹的spring boot 圖片上傳與顯示功能實(shí)例詳解，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時(shí)回復(fù)大家的。在此也非常感謝大家對服務(wù)器之家網(wǎng)站的支持！
原文鏈接：http://blog.csdn.net/a625013/article/details/52414470
