Spark Java:由于未提供多零件配置，因此无法处理零件 [英] Spark Java: Unable to process parts as no multi-part configuration has been provided
问题描述
我想使用spark从html表单上载文件.以下是我的Java函数来处理发布路线:
I want to upload a file from an html form using spark. Following is my java function to handle the post route:
Spark.post("/upload", "multipart/form-data", (request, response) -> {
String location = "temporary"; // the directory location where files will be stored
long maxFileSize = 100000000; // the maximum size allowed for uploaded files
long maxRequestSize = 100000000; // the maximum size allowed for multipart/form-data requests
int fileSizeThreshold = 1024; // the size threshold after which files will be written to disk
MultipartConfigElement multipartConfigElement = new MultipartConfigElement(
location, maxFileSize, maxRequestSize, fileSizeThreshold);
request.raw().setAttribute("org.eclipse.multipartConfig",
multipartConfigElement);
Collection<Part> parts = request.raw().getParts(); //Line 50 where error is there
for (Part part : parts) {
System.out.println("Name: " + part.getName());
System.out.println("Size: " + part.getSize());
System.out.println("Filename: " + part.getSubmittedFileName());
}
String fName = request.raw().getPart("xmlfile").getSubmittedFileName();
System.out.println("Title: " + request.raw().getParameter("title"));
System.out.println("File: " + fName);
Part uploadedFile = request.raw().getPart("xmlFile");
Path out = Paths.get("temporary/" + fName);
try (final InputStream in = uploadedFile.getInputStream()) {
Files.copy(in, out);
uploadedFile.delete();
}
// cleanup
multipartConfigElement = null;
//parts = null;
uploadedFile = null;
return "OK";
});
以下是HTML表单:
<form class="ui fluid action input" id="fileForm" method="post" action="/sparkapp/upload" enctype = "multipart/form-data">
<input type="text" name="filePath" readonly>
<input type="file" name="xmlFile">
<button type="submit" value="Submit">
</form>
上传文件时，我得到500:内部服务器错误，并显示以下堆栈跟踪:
When I'm uploading a file, I'm getting 500: Internal server error with the following stack trace:
java.lang.IllegalStateException: Unable to process parts as no multi-part configuration has been provided
at org.apache.catalina.connector.Request.parseParts(Request.java:2734)
at org.apache.catalina.connector.Request.getParts(Request.java:2701)
at org.apache.catalina.connector.Request.getPart(Request.java:2885)
at org.apache.catalina.connector.RequestFacade.getPart(RequestFacade.java:1089)
at javax.servlet.http.HttpServletRequestWrapper.getPart(HttpServletRequestWrapper.java:362)
at com.amulya.Application$2.handle(Application.java:50)
at spark.RouteImpl$1.handle(RouteImpl.java:61)
at spark.http.matching.Routes.execute(Routes.java:61)
at spark.http.matching.MatcherFilter.doFilter(MatcherFilter.java:127)
at spark.servlet.SparkFilter.doFilter(SparkFilter.java:173)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1100)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:687)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
遵循以下问题，但答案不起作用: SparkJava:上载文件在Spark Java框架中不起作用
Followed the following question but the answer didn't work: SparkJava: Upload file did't work in Spark java framework
我正在使用Eclipse IDE和tomcat服务器.
I'm using eclipse IDE and tomcat server.
请帮助我解决这个问题.
Please help me with this problem.
推荐答案
我刚刚发现，当我使用带有spark的tomcat服务器时，我已经设置了过滤器，即spark.servlet.SparkFilter.
I just found out that as I'm using tomcat server with spark, I had set up filter i.e. spark.servlet.SparkFilter.
通过此答案，我发现实际上我需要设置
Through this answer I found out that actually, I needed to set
allowCasualMultipartParsing="true"
，以便Tomcat在调用HttpServletRequest.getPart*或HttpServletRequest.getParameter*时自动解析multipart/form-data请求主体，即使目标servlet未被标记为@MultipartConfig注释.
in the webapp's <Context> element in Webapp/META-INF/context.xml or Tomcat/conf/server.xml so that Tomcat should automatically parse multipart/form-data request bodies when HttpServletRequest.getPart* or HttpServletRequest.getParameter* is called, even when the target servlet isn't marked with the @MultipartConfig annotation.
请参阅以下链接以供参考:
Please see the following links for reference:
http://sparkjava.com/documentation.html#other-webserver
https://stackoverflow.com/a/8050589/2256258
http://tomcat.apache.org/tomcat-7.0 -doc/config/context.html
https://examples.javacodegeeks. com/enterprise-java/tomcat/tomcat-context-xml-configuration-example/
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