java - 如何以编程方式设置内容类型？获取 org.jvnet.mimepull.MIMEParsingException : Missing start boundary

Question

我有一个命令行 java 实用程序，需要对 Jersey 休息服务进行休息调用。

@POST    
@Path("/{name}")
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.MULTIPART_FORM_DATA)
public Response insert(@PathParam("name") String nestName,
                           @QueryParam("id") String id,
                           @FormDataParam("file") InputStream fileStream,
                           @FormDataParam("file") FormDataContentDisposition fileDetail) throws IOException {}

并通过 java 命令行实用程序发出请求，如下所示:

Map<String,String> headers = new HashMap<String,String>();
headers.put(HttpHeaders.CONTENT_TYPE, MediaType.MULTIPART_FORM_DATA + "; boundary=--------------------------458269817398405552698839");
headers.put(HttpHeaders.ACCEPT, "*/*");
headers.put(HttpHeaders.CACHE_CONTROL, "no-cache");
headers.put(HttpHeaders.ACCEPT_ENCODING, "gzip, deflate");

URLConnection conn = url.openConnection();
if(headers!=null && !headers.isEmpty()) {
    for(Map.Entry<String, String> entry: headers.entrySet()) {
        conn.setRequestProperty(entry.getKey(),entry.getValue());
    }
}

ServiceHttpResponse response = new ServiceHttpResponse(con.getResponseCode(), con.getResponseMessage());

我收到以下异常。还有其他方法可以设置 mime 类型吗？

javax.ws.rs.BadRequestException: HTTP 400 Bad Request

at org.glassfish.jersey.media.multipart.internal.MultiPartReaderClientSide.readFrom(MultiPartReaderClientSide.java:188) at org.glassfish.jersey.media.multipart.internal.MultiPartReaderClientSide.readFrom(MultiPartReaderClientSide.java:93) at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.invokeReadFrom(ReaderInterceptorExecutor.java:256) at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.aroundReadFrom(ReaderInterceptorExecutor.java:235) at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:155) at org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundReadFrom(MappableExceptionWrapperInterceptor.java:74) at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:155) at org.glassfish.jersey.message.internal.MessageBodyFactory.readFrom(MessageBodyFactory.java:1085) at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:874) at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:808) at org.glassfish.jersey.server.ContainerRequest.readEntity(ContainerRequest.java:234) at org.glassfish.jersey.media.multipart.internal.FormDataParamValueFactoryProvider$ValueFactory.getEntity(FormDataParamValueFactoryProvider.java:126) at org.glassfish.jersey.media.multipart.internal.FormDataParamValueFactoryProvider$FormDataParamValueFactory.provide(FormDataParamValueFactoryProvider.java:280) at org.glassfish.jersey.server.spi.internal.ParamValueFactoryWithSource.provide(ParamValueFactoryWithSource.java:71) at org.glassfish.jersey.server.spi.internal.ParameterValueHelper.getParameterValues(ParameterValueHelper.java:90)

at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$AbstractMethodParamInvoker.getParamValues(JavaResourceMethodDispatcherProvider.java:127) at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:160)

at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99)

at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389)

at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347)

at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)

at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326)

at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)

at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)

at org.glassfish.jersey.internal.Errors.process(Errors.java:315)

at org.glassfish.jersey.internal.Errors.process(Errors.java:297) at org.glassfish.jersey.internal.Errors.process(Errors.java:267)

at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305)

at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154)

at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473) at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427)

at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388)

at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341)

at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228)

at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:808)

at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)

at com.cadence.adw.common.generic.xml.server.service.http.RequestInterceptor.doFilter(RequestInterceptor.java:95)

at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)

at org.eclipse.jetty.servlets.UserAgentFilter.doFilter(UserAgentFilter.java:83) at org.eclipse.jetty.servlets.GzipFilter.doFilter(GzipFilter.java:300)

at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)

at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)

at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)

at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)

at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)

at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)

at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)

at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)

at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)

at org.eclipse.jetty.server.Server.handle(Server.java:497)

at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)

at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)

at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)

at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)

at java.lang.Thread.run(Thread.java:748)

Caused by: org.jvnet.mimepull.MIMEParsingException: Missing start boundary

at org.jvnet.mimepull.MIMEParser.skipPreamble(MIMEParser.java:318)

at org.jvnet.mimepull.MIMEParser.access$300(MIMEParser.java:68)

at org.jvnet.mimepull.MIMEParser$MIMEEventIterator.next(MIMEParser.java:154)

at org.jvnet.mimepull.MIMEParser$MIMEEventIterator.next(MIMEParser.java:132)

at org.jvnet.mimepull.MIMEMessage.makeProgress(MIMEMessage.java:228) at org.jvnet.mimepull.MIMEMessage.parseAll(MIMEMessage.java:189)

at org.jvnet.mimepull.MIMEMessage.getAttachments(MIMEMessage.java:115)

at org.glassfish.jersey.media.multipart.internal.MultiPartReaderClientSide.getMimeParts(MultiPartReaderClientSide.java:272)

at org.glassfish.jersey.media.multipart.internal.MultiPartReaderClientSide.readMultiPart(MultiPartReaderClientSide.java:231)

at org.glassfish.jersey.media.multipart.internal.MultiPartReaderServerSide.readMultiPart(MultiPartReaderServerSide.java:91)

at org.glassfish.jersey.media.multipart.internal.MultiPartReaderClientSide.readFrom(MultiPartReaderClientSide.java:183)

... 58 more

Answer 1

设置请求参数不是发送多部分请求的正确方法。仅仅设置带有边界的内容类型是不够的。该边界在请求主体内部用于分隔请求的不同“部分”并结束主体。例如

Content-Type: multipart/form-data; boundary=AaB03x

--AaB03x
Content-Disposition: form-data; name="submit-name"

Larry
--AaB03x
Content-Disposition: form-data; name="files"; filename="file1.txt"
Content-Type: text/plain

... contents of file1.txt ...
--AaB03x--

UrlConnection (或 HttpUrlConnection )没有任何 API 可以轻松发送多部分请求。您需要手动创建此请求正文并通过连接的输出流发送出去。

multipart 的目的是发送多个参数，其中一些参数是二进制对象，例如图像文件等。如果所有参数都只是文本，则可以使用 application/x-www-form-urlencoded content-type。这就是当您发出 POST 请求时在 HttpUrlConnection 上设置请求参数所执行的操作。然后在服务器上，您将使用 @FormParam("param-name") 而不是 @FormDataParam。如果您发出 GET 请求，则为 @QueryParam。

如果您想要发出多部分请求，您应该寻找支持发送请求的客户端，而不必手动构建正确的正文格式。您可以查看Jersey Client及其 Multipart support 。还有许多其他客户端库。只需进行一些搜索即可。

还有

• What is difference between @FormDataParam and @FormParam?