我正在尝试使用“流式”Apache Commons File Upload API 上传一个大文件。
我使用 Apache Commons File Uploader 而不是默认的 Spring Multipart uploader 的原因是当我们上传非常大的文件大小 (~2GB) 时它会失败。我正在开发一个 GIS 应用程序，这种文件上传很常见。
我的文件上传 Controller 的完整代码如下:
@Controller
public class FileUploadController {
@RequestMapping(value="/upload", method=RequestMethod.POST)
public void upload(HttpServletRequest request) {
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (!isMultipart) {
// Inform user about invalid request
return;
}
//String filename = request.getParameter("name");
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload();
// Parse the request
try {
FileItemIterator iter = upload.getItemIterator(request);
while (iter.hasNext()) {
FileItemStream item = iter.next();
String name = item.getFieldName();
InputStream stream = item.openStream();
if (item.isFormField()) {
System.out.println("Form field " + name + " with value " + Streams.asString(stream) + " detected.");
} else {
System.out.println("File field " + name + " with file name " + item.getName() + " detected.");
// Process the input stream
OutputStream out = new FileOutputStream("incoming.gz");
IOUtils.copy(stream, out);
stream.close();
out.close();
}
}
}catch (FileUploadException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
}
@RequestMapping(value = "/uploader", method = RequestMethod.GET)
public ModelAndView uploaderPage() {
ModelAndView model = new ModelAndView();
model.setViewName("uploader");
return model;
}
}
问题在于 getItemIterator(request) 总是返回一个没有任何项目的迭代器(即 iter.hasNext() )总是返回 false .
我的application.properties文件如下:
spring.datasource.driverClassName=org.postgresql.Driver
spring.datasource.url=jdbc:postgresql://localhost:19095/authdb
spring.datasource.username=georbis
spring.datasource.password=asdf123
logging.level.org.springframework.web=DEBUG
spring.jpa.hibernate.ddl-auto=update
multipart.maxFileSize: 128000MB
multipart.maxRequestSize: 128000MB
server.port=19091
/uploader 的 JSP View 如下:
<html>
<body>
<form method="POST" enctype="multipart/form-data" action="/upload">
File to upload: <input type="file" name="file"><br />
Name: <input type="text" name="name"><br /> <br />
Press here to upload the file!<input type="submit" value="Upload">
<input type="hidden" name="${_csrf.parameterName}" value="${_csrf.token}" />
</form>
</body>
</html>
我可能做错了什么？
最佳答案
感谢 M.Deinum 的一些非常有用的评论，我设法解决了这个问题。我已经清理了一些原始帖子，并将其发布为完整的答案以供将来引用。
我犯的第一个错误是没有禁用 Spring 提供的默认 MultipartResolver。这最终在解析器处理 HttpServeletRequest 并因此在我的 Controller 可以对其采取行动之前消耗它。
感谢M. Deinum，禁用它的方法如下:
multipart.enabled=false
然而，在这之后还有另一个隐藏的陷阱在等着我。一旦我禁用了默认的多部分解析器，我在尝试上传时就开始收到以下错误:
Fri Sep 25 20:23:47 IST 2015
There was an unexpected error (type=Method Not Allowed, status=405).
Request method 'POST' not supported
在我的安全配置中，我启用了 CSRF 保护。这需要我以以下方式发送我的 POST 请求:
<html>
<body>
<form method="POST" enctype="multipart/form-data" action="/upload?${_csrf.parameterName}=${_csrf.token}">
<input type="file" name="file"><br>
<input type="submit" value="Upload">
</form>
</body>
</html>
我还稍微修改了我的 Controller :
@Controller
public class FileUploadController {
@RequestMapping(value="/upload", method=RequestMethod.POST)
public @ResponseBody Response<String> upload(HttpServletRequest request) {
try {
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (!isMultipart) {
// Inform user about invalid request
Response<String> responseObject = new Response<String>(false, "Not a multipart request.", "");
return responseObject;
}
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload();
// Parse the request
FileItemIterator iter = upload.getItemIterator(request);
while (iter.hasNext()) {
FileItemStream item = iter.next();
String name = item.getFieldName();
InputStream stream = item.openStream();
if (!item.isFormField()) {
String filename = item.getName();
// Process the input stream
OutputStream out = new FileOutputStream(filename);
IOUtils.copy(stream, out);
stream.close();
out.close();
}
}
} catch (FileUploadException e) {
return new Response<String>(false, "File upload error", e.toString());
} catch (IOException e) {
return new Response<String>(false, "Internal server IO error", e.toString());
}
return new Response<String>(true, "Success", "");
}
@RequestMapping(value = "/uploader", method = RequestMethod.GET)
public ModelAndView uploaderPage() {
ModelAndView model = new ModelAndView();
model.setViewName("uploader");
return model;
}
}
其中 Response 只是我使用的一个简单的通用响应类型:
public class Response<T> {
/** Boolean indicating if request succeeded **/
private boolean status;
/** Message indicating error if any **/
private String message;
/** Additional data that is part of this response **/
private T data;
public Response(boolean status, String message, T data) {
this.status = status;
this.message = message;
this.data = data;
}
// Setters and getters
...
}
关于SpringBoot : Large Streaming File Upload Using Apache Commons FileUpload，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32782026/