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Алексей
Asked:2022-09-23 16:57:05 +0800 CST2022-09-23 16:57:05 +0800 CST

在 Spring Boot 中打开上传到服务器的文件的问题

  • 772

有一个控制器，我在其中@GetMapping处理页面

orders/{id}/upload

实现以下功能的地方。

显示文件列表，其中包含目录中这些文件的链接

src/main/resources/static/layout/{id}/

并实现了一个多部分表单，通过该表单将文件上传到服务器到上面RestControllervia中指示的文件夹@PostMapping。

问题是：
当我将文件上传到服务器时，它会进入文件列表，但是如果我点击链接，我会收到 404 错误，尽管文件在服务器上。

我重新启动服务器并且链接开始工作（链接地址没有改变）。

告诉我可能是什么问题？

@Controller
public class OrderController {
  @GetMapping("/orders/{id}/upload")
  public String upload(@PathVariable(value = "id") long id, Model model) {
    model.addAttribute("order_number", id);
    String directory = "src/main/resources/static/layout/" + id + "/";
    File file = new File(directory);
    if (!file.exists()) {
        file.mkdirs();
    }
    File[] listFiles = file.listFiles();
    model.addAttribute("listfile", listFiles);
    return "upload";
  }
}

.

@Service
public class FileUploadService {
    public void uploadFile(MultipartFile file, long id) throws IOException {
        File uploadFile = new File("/Users/prisukhin/Documents/printing/src/main/resources/static/layout/" + id + "/" + file.getOriginalFilename());
        if(file != null) {
            file.transferTo(uploadFile);
        }
    }
}

.

@RestController
public class FileUploadRestController {

    @Autowired
    FileUploadService fileUploadService;

    @PostMapping("/orders/{id}/upload")
    public RedirectView fileUpload(@PathVariable(value = "id") long id, @RequestParam MultipartFile file_form, Model model) throws IOException {
        fileUploadService.uploadFile(file_form, id);
        return new RedirectView("/orders/{id}/upload");
    }

upload.html 文件的一部分

<table class="table table-hover">    
  <tbody th:each="l : ${listfile}">
    <tr>
      <td>
        <a th:text="${#strings.substringAfter(l, '/layout/'+order_number+'/')}" th:href="@{'../../'}+${#strings.substringAfter(l, '/static/')}" target="_blank"></a>. 
      </td>
     </tr>
  </tbody>
 </table>
 <form th:attr="action=@{'/orders/'} + ${order_number} + @{'/upload'}" method="POST" enctype="multipart/form-data" class="upload-form mx-auto">
   <div class="input-group mb-3">
     <input type="file" class="form-control" name="file_form" />
       <div class="input-group-append">
         <button class="btn btn-secondary" type="submit">Загрузить</button>
       </div>
   </div>
 </form>

白标错误页面

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Fri Sep 23 11:50:06 MSK 2022
There was an unexpected error (type=Not Found, status=404).
No message available

调试信息

2022-09-23 11:50:02.881 DEBUG 58415 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : POST "/orders/45/upload", parameters={multipart}
2022-09-23 11:50:02.947 DEBUG 58415 --- [nio-8080-exec-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to com.prisukhin.integral.controllers.FileUploadRestController#fileUpload(long, MultipartFile, Model)
2022-09-23 11:50:03.024 DEBUG 58415 --- [nio-8080-exec-1] o.s.web.servlet.view.RedirectView        : View [RedirectView], model {}
2022-09-23 11:50:03.038 DEBUG 58415 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed 302 FOUND
2022-09-23 11:50:03.046 DEBUG 58415 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : GET "/orders/45/upload", parameters={}
2022-09-23 11:50:03.047 DEBUG 58415 --- [nio-8080-exec-2] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to com.prisukhin.integral.controllers.OrderController#upload(long, Model)
2022-09-23 11:50:03.065 DEBUG 58415 --- [nio-8080-exec-2] o.s.w.s.v.ContentNegotiatingViewResolver : Selected 'text/html' given [text/html, application/xhtml+xml, image/avif, image/webp, image/apng, application/xml;q=0.9, application/signed-exchange;v=b3;q=0.9, */*;q=0.8]
2022-09-23 11:50:03.668 DEBUG 58415 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet        : GET "/css/style.css", parameters={}
2022-09-23 11:50:03.672 DEBUG 58415 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : GET "/img/logo-1.png", parameters={}
2022-09-23 11:50:03.675 DEBUG 58415 --- [nio-8080-exec-3] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped to ResourceHttpRequestHandler [classpath [META-INF/resources/], classpath [resources/], classpath [static/], classpath [public/], ServletContext [/]]
2022-09-23 11:50:03.675 DEBUG 58415 --- [nio-8080-exec-4] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped to ResourceHttpRequestHandler [classpath [META-INF/resources/], classpath [resources/], classpath [static/], classpath [public/], ServletContext [/]]
2022-09-23 11:50:03.691 DEBUG 58415 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : Completed 200 OK
2022-09-23 11:50:03.693 DEBUG 58415 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet        : Completed 200 OK
2022-09-23 11:50:03.728 DEBUG 58415 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : Completed 200 OK


2022-09-23 11:50:06.162 DEBUG 58415 --- [nio-8080-exec-5] **o.s.web.servlet.DispatcherServlet        : GET "/layout/45/0000005z.xml", parameters={}
2022-09-23 11:50:06.163 DEBUG 58415 --- [nio-8080-exec-5] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped to ResourceHttpRequestHandler [classpath [META-INF/resources/], classpath [resources/], classpath [static/], classpath [public/], ServletContext [/]]
2022-09-23 11:50:06.164 DEBUG 58415 --- [nio-8080-exec-5] o.s.w.s.r.ResourceHttpRequestHandler     : Resource not found
2022-09-23 11:50:06.165 DEBUG 58415 --- [nio-8080-exec-5] o.s.web.servlet.DispatcherServlet        : Completed 404 NOT_FOUND
2022-09-23 11:50:06.173 DEBUG 58415 --- [nio-8080-exec-5] o.s.web.servlet.DispatcherServlet        : "ERROR" dispatch for GET "/error", parameters={}
2022-09-23 11:50:06.177 DEBUG 58415 --- [nio-8080-exec-5] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController#errorHtml(HttpServletRequest, HttpServletResponse)
2022-09-23 11:50:06.226 DEBUG 58415 --- [nio-8080-exec-5] o.s.w.s.v.ContentNegotiatingViewResolver : Selected 'text/html' given [text/html, text/html;q=0.8]
2022-09-23 11:50:06.229 DEBUG 58415 --- [nio-8080-exec-5] o.s.web.servlet.DispatcherServlet        : Exiting from "ERROR" dispatch, status 404**
java

0 个回答

  1. Best Answer

    该文件夹/src/main/resources/不用于上传用户文件。
    源中的此文件夹用于应用程序资源。

    组装完成后，这个文件夹的所有内容都转移到

    • 文件夹target/classes
      以及已编译的类和导入
      的依赖项（如果项目是由 maven 构建的）
    • 或到一个文件夹build/resources
      （如果项目是由 gradle 构建的）
      编译的类被移动到build/classes

    从哪里（target/ build）启动应用程序。

    这就是为什么在重新启动之前您什么都看不到的原因。

    当您发出请求时，/layout/45/0000005z.xml您的请求ResourceHttpRequestHandler不是沿着路径/Users/prisukhin/Documents/printing/src/main/resources/static/layout/45/0000005z.xml（如您所料）而是沿着路径找到它

    • /Users/prisukhin/Documents/printing/target/static/layout/45/0000005z.xml
      （如果项目是由 maven 构建的）
    • /Users/prisukhin/Documents/printing/build/resources/static/layout/45/0000005z.xml
      （如果项目是 gradle 构建的）

    我求你了，不要下载任何东西。

    • 既不在target/classes/
    • 既不在build/resources/

    它们也不适用于加载用户文件。
    这些是用于构建项目的临时文件夹。

    如何进行？

    您需要在源文件夹和项目构建文件夹之外创建一个单独的文件夹。
    如果您希望它在附近，您可以创建如下内容：

    • /Users/prisukhin/Documents/printing/storage/

    并调整静力学的回归就可以了。

    为此，请将以下几行添加到方法中的 MVC 配置文件（配置类实现WebMvcConfigurer）中：addResourceHandlers(ResourceHandlerRegistry registry)

    registry
    .addResourceHandler("/storage/**")
    .addResourceLocations("file:/Users/prisukhin/Documents/printing/storage/")
    ;

    然后你需要修复控制器

    @Controller
public class OrderController {
  @GetMapping("/orders/{id}/upload")
  public String upload(@PathVariable(value = "id") long id, Model model) {
    model.addAttribute("order_number", id);
    String directory = "/Users/prisukhin/Documents/printing/storage/layout/" + id + "/";
    File file = new File(directory);
    if (!file.exists()) {
        file.mkdirs();
    }
    File[] listFiles = file.listFiles();
    model.addAttribute("listfile", listFiles);
    return "upload";
  }
}

    服务

    @Service
public class FileUploadService {
    public void uploadFile(MultipartFile file, long id) throws IOException {
        File uploadFile = new File("/Users/prisukhin/Documents/printing/storage/layout/" + id + "/" + file.getOriginalFilename());
        if(file != null) {
            file.transferTo(uploadFile);
        }
    }
}

    并修复链接...

    他们需要参考/storage/layout/45/0000005z.xml

    配置

    最好将此路径放入 application.properties 通过添加如下行：

    app.storage.path=/Users/prisukhin/Documents/printing/storage/

    之后，您可以在服务（和任何地方）中实现它，如下所示

    @Value("${app.storage.path}")
String storagePath;

    在役：

    @Service
public class FileUploadService {

    @Value("${app.storage.path}")
    String storagePath;

    public void uploadFile(MultipartFile file, long id) throws IOException {
        File uploadFile = new File(storagePath + "layout/" + id + "/" + file.getOriginalFilename());
        if(file != null) {
            file.transferTo(uploadFile);
        }
    }
}

    在控制器中：

    @Controller
public class OrderController {

  @Value("${app.storage.path}")
  String storagePath;

  @GetMapping("/orders/{id}/upload")
  public String upload(@PathVariable(value = "id") long id, Model model) {
    model.addAttribute("order_number", id);
    String directory = storagePath + "layout/" + id + "/";
    File file = new File(directory);
    if (!file.exists()) {
        file.mkdirs();
    }
    File[] listFiles = file.listFiles();
    model.addAttribute("listfile", listFiles);
    return "upload";
  }
}

    然后，您可以轻松地移动此应用程序，而不必担心您的应用程序被固定在您的个人计算机上。您始终可以为所需的环境指定所需的路径，它可以在您的计算机和某处的服务器上同时工作/var/www/

    • 1

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