javax.servlet.ServletException：UT010016：在 io.undertow.servlet.spec.HttpServletRequestImpl.loadParts 不是多部分请求

Question

我有一个 JSF 2.2 页面，其中包含部署到 WildFly 8.2.0 的以下文件上传表单。

<h:form>
    <h:inputFile value="#{filePair.miscPart}" />
    <h:commandButton value="submit" action="validationResult" />
</h:form>

提交时，出现以下异常：

javax.servlet.ServletException: UT010016: Not a multi part request
    at io.undertow.servlet.spec.HttpServletRequestImpl.loadParts(HttpServletRequestImpl.java:508)
    at io.undertow.servlet.spec.HttpServletRequestImpl.getParts(HttpServletRequestImpl.java:459)
    at com.sun.faces.renderkit.html_basic.FileRenderer.decode(FileRenderer.java:91)
    at javax.faces.component.UIComponentBase.decode(UIComponentBase.java:831)
    at javax.faces.component.UIInput.decode(UIInput.java:771)
    at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1226)
    at javax.faces.component.UIInput.processDecodes(UIInput.java:676)
    at javax.faces.component.UIForm.processDecodes(UIForm.java:225)
    at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1221)
    at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1221)
    at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:929)
    at com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:78)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:61)
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
    at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
    at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:56)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:51)
    at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:45)
    at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:63)
    at io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:56)
    at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58)
    at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70)
    at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:261)
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:247)
    at io.undertow.servlet.handlers.ServletInitialHandler.access[=13=]0(ServletInitialHandler.java:76)
    at io.undertow.servlet.handlers.ServletInitialHandler.handleRequest(ServletInitialHandler.java:166)
    at io.undertow.server.Connectors.executeRootHandler(Connectors.java:197)
    at io.undertow.server.HttpServerExchange.run(HttpServerExchange.java:759)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

这是怎么造成的，我该如何解决？

Answer 1

您忘记通过 enctype 属性设置表单编码类型。

<h:form>

默认为application/x-www-form-urlencoded，不适合发送二进制数据，例如通过<input type="file">发送的二进制文件。使用 <input type="file"> 元素（由 JSF <h:inputFile> 生成）时，您需要根据 HTML specification 将其设置为 multipart/form-data。这是 HTML 规范中的相关引用：

enctype = This attribute specifies the content type used to submit the form to the server (when the value of method is "post"). The default value for this attribute is "application/x-www-form-urlencoded". The value "multipart/form-data" should be used in combination with the INPUT element, type="file".

因此，相应地修复它：

<h:form enctype="multipart/form-data">

另请参阅：

• What is multipart/form-data
• How to upload file using JSF 2.2 <h:inputFile>? Where is the saved File?