在使用JavaScript / AJAX向Jakarta EE 8后端提交multipart / form-data后，“从对象流反序列化对象时出错”

Question

我正在开发一个带有JavaScript前端的RESTful webapp和带有Netbeans 8.2的Jakarta EE后端，到目前为止一直都很好用。我有一个表单，用户上传他的图像，我想将此图像保存为我的数据库中的blob（我知道缺点，但我想以这种方式进行）。请参阅下面的代码段。

首先，表单上的POST请求提交：

 var file = URL.createObjectURL(document.getElementById("candidatePicture").files[0]);


    fetch(file).then(response => {
        response.blob().then(photo => {

            const reader = new FileReader();

            // Start reading the blob as text.
            reader.readAsText(photo);

            // This fires after the blob has been read/loaded.
            reader.addEventListener('loadend', (e) => {

                const text = e.srcElement.result;
                var ballotData = $("#addBallotForm").serializeArray();
                var ballot = {
                    "candidateName": ballotData[0].value,
                    "positionName": ballotData[1].value,
                    "candidateNIC": ballotData[2].value,
                    "partyname": ballotData[3].value,
                    "candidateSlogan": ballotData[4].value,
                    "candidatePicture": text,
                    "actionPlan": ""
                };
                console.log(JSON.stringify(ballot));

                $.ajax({
                    headers: {
                        'Content-Type': 'application/json'
                    },
                    crossDomain: true,
                    type: "POST",
                    enctype: 'application/json',
                    processData: false, // Important! prevent jQuery from transforming the data into a query string 
                    cache: false,
                    url: url,
                    data: JSON.stringify(ballot)
                }).done((data, textStatus, jqXHR) => {
                    if (jqXHR.status === 200) {
                        swal("The ballot has been succesfully created!", {icon: "success"})
                                .then((confirm) => {
                                    if (confirm) {
                                        table.ajax.reload();
                                        clearAddBallotModal(); // clear the form
                                        $("#addBallotModal").click(); // close the modal
                                        displayBallots(); // redisplay the ballots
                                    }
                                });
                    } else {
                        swal("Oops! Invalid ballot Input", {icon: "warning"});
                    }
                }).fail((jqXHR, textStatus, errorThrown) => {
                    swal("Error! An error occured!", {icon: "error"});
                });

            });

        });
    });

二，资源端点：

 @POST
@Path("{ipaddress}/{electionid}")
@ApiOperation(value = "Create new ballot item", notes = "This can only be done by logged in users.")
@ApiResponses(value = {
    @ApiResponse(code = 400, message = "Invalid ballot item Input"),
    @ApiResponse(code = 200, message = "Ballot item created")})
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public Response add(
        @ApiParam(value = "The ipaddress of the ballot item to be created", required = true) @PathParam("ipaddress") String ip,
        @ApiParam(value = "The election's id", required = true) @PathParam("electionid") String electionid,
        @ApiParam(value = "The ballot item that needs to be added", required = true) BallotItem newBallot) {

    Users curUser = UsersService.find(1l); 
    Election election = electionService.find(Long.parseLong(electionid));
    newBallot.setElectionID(election);
    ballotsService.create(newBallot);
    operationsService.create(new Operation(curUser, "Created a new ballot item", "Candidate name: " + newBallot.getCandidateName() + " and Election ID: " + electionid, new Date(), ip));
    return Response.ok(newBallot).build();
}

我在netbeans控制台中收到以下错误：Severe: javax.ws.rs.ProcessingException: Error deserializing object from entity stream. javax.ws.rs.ProcessingException: Error deserializing object from entity stream. at org.glassfish.jersey.jsonb.internal.JsonBindingProvider.readFrom(JsonBindingProvider.java:101) at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.invokeReadFrom(ReaderInterceptorExecutor.java:257) at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.aroundReadFrom(ReaderInterceptorExecutor.java:236) at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:156) at org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundReadFrom(MappableExceptionWrapperInterceptor.java:73) at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:156) at org.glassfish.jersey.message.internal.MessageBodyFactory.readFrom(MessageBodyFactory.java:1093) at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:874) at org.glassfish.jersey.server.ContainerRequest.readEntity(ContainerRequest.java:271) at org.glassfish.jersey.server.internal.inject.EntityParamValueParamProvider$EntityValueSupplier.apply(EntityParamValueParamProvider.java:98) at org.glassfish.jersey.server.internal.inject.EntityParamValueParamProvider$EntityValueSupplier.apply(EntityParamValueParamProvider.java:81) at org.glassfish.jersey.server.spi.internal.ParamValueFactoryWithSource.apply(ParamValueFactoryWithSource.java:75) at org.glassfish.jersey.server.spi.internal.ParameterValueHelper.getParameterValues(ParameterValueHelper.java:93) at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$AbstractMethodParamInvoker.getParamValues(JavaResourceMethodDispatcherProvider.java:133) at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:200) at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:103) at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:493) at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:415) at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:104) at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:277) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:272) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:268) at org.glassfish.jersey.internal.Errors.process(Errors.java:316) at org.glassfish.jersey.internal.Errors.process(Errors.java:298) at org.glassfish.jersey.internal.Errors.process(Errors.java:268) at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:289) at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:256) at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:704) at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:416) at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:370) at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:389) at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:342) at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:229) at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1628) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:258) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:755) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:575) at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:159) at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:371) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:238) at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:516) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:213) at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:182) at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:156) at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:218) at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:95) at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:260) at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:177) at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:109) at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:88) at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:53) at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:524) at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:89) at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:94) at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:33) at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:114) at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:569) at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:549) at java.lang.Thread.run(Thread.java:745) Caused by: javax.json.bind.JsonbException: Internal error: Event START_ARRAY not found. Last data: [EVENT: START_OBJECT KEY_NAME: candidatePicture] at org.eclipse.yasson.internal.JsonbRiParser.moveTo(JsonbRiParser.java:203) at org.eclipse.yasson.internal.serializer.AbstractArrayDeserializer.moveToFirst(AbstractArrayDeserializer.java:82) at org.eclipse.yasson.internal.serializer.AbstractContainerDeserializer.deserializeInternal(AbstractContainerDeserializer.java:75) at org.eclipse.yasson.internal.serializer.AbstractContainerDeserializer.deserialize(AbstractContainerDeserializer.java:61) at org.eclipse.yasson.internal.serializer.ObjectDeserializer.deserializeNext(ObjectDeserializer.java:165) at org.eclipse.yasson.internal.serializer.AbstractContainerDeserializer.deserializeInternal(AbstractContainerDeserializer.java:85) at org.eclipse.yasson.internal.serializer.AbstractContainerDeserializer.deserialize(AbstractContainerDeserializer.java:61) at org.eclipse.yasson.internal.Unmarshaller.deserializeItem(Unmarshaller.java:62) at org.eclipse.yasson.internal.Unmarshaller.deserialize(Unmarshaller.java:52) at org.eclipse.yasson.internal.JsonBinding.deserialize(JsonBinding.java:45) at org.eclipse.yasson.internal.JsonBinding.fromJson(JsonBinding.java:85) at org.glassfish.jersey.jsonb.internal.JsonBindingProvider.readFrom(JsonBindingProvider.java:99) ... 60 more

我将'application / json'更改为'mulitpart / form-data'，将MediaType.APPLICATION_JSON更改为其他mediatypes，但我得到的是我的浏览器控制台中的415错误作为响应。请问有没有人有想法解决这个问题。提前致谢

Answer 1

JSONB支持反序列化字节数组。问题是您的特定用例。

默认情况下使用BYTE编码。在这种情况下，你的candidatePicture属性应该是一个数组，看起来类似于：

"candidatePicture":[89,97,115,115,111,110,32,105,115,32,112,101,114,102,101,99,116,33]

我发现这不是你的情况。

如果使用BASE_64编码，这有点标准，您应该告诉JSONB引擎在自定义配置中使用它：

JsonbConfig config = new JsonbConfig()
                .withBinaryDataStrategy(BinaryDataStrategy.BASE_64);
Jsonb jsonb = JsonbBuilder.newBuilder()
                .withConfig(config)
                .build();
jsonb.fromJson(...);

在这种情况下，您的属性应该是BASE64编码的字符串，如下所示：

"candidatePicture":"WWFzc29uIGlzIHBlcmZlY3Qh"

我想这是你的情况，但你的字符串看起来不像BASE64编码。尝试一下，如果不起作用，请检查用于编码二进制数据的编码。

Answer 2

问题是你的BallotItem类包含字段byte[] candidatePicture，JSON绑定默认情况下不知道如何从传入的JSON设置。 JSON只包含一个带二进制数据的字符串（我不确定它是否用base64编码）。 Jakarta EE Server尝试将字符串保存到字节数组中并失败。

这可能是您的Jakarta EE服务器中的错误，或者可能未指定。 JSON-Binding规范http://json-b.net/没有提到它应该如何工作。它仅指定默认情况下使用“byte”策略将字节数组转换为JSON，但没有提及如何从JSON转换二进制数据。

我建议用candidatePicture在BallotItem中为你的JsonbTypeDeserializer字段添加一个自定义反序列化器。这应该工作，但需要几行代码来实现。

在使用JavaScript / AJAX向Jakarta EE 8后端提交multipart / form-data后，“从对象流反序列化对象时出错”

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在使用JavaScript / AJAX向Jakarta EE 8后端提交multipart / form-data后，“从对象流反序列化对象时出错”

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