重要提示： fixed （社区发布）PrimeFaces 5.1 final此问题讨论的问题为released 2014年10月6日星期一（从现在开始几分钟前）。我尝试了JSF 2.2.8-02（或api，impl）。
因此，如果您碰巧使用该版本（或更高版本，无需提及），您甚至不需要再阅读此问题了。
我在
上运行了一个Web应用程序使用AJAX上传文件以外的所有内容都能正常运行。以下xhtml文件通过PrimeFaces命令按钮触发的AJAX请求发送多部分内容。
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:p="http://primefaces.org/ui"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<h:head>
<title>Test</title>
</h:head>
<h:body>
<h:form prependId="true" enctype="multipart/form-data">
<p:fileUpload id="txtCatImage"
value="#{testManagedBean.uploadedFile}"
mode="advanced"
dragDropSupport="true"
fileLimit="1"
sizeLimit="100000"
multiple="false"
allowTypes="/(\.|\/)(gif|jpe?g|png)$/"
fileUploadListener="#{testManagedBean.fileUploadListener}"/>
<p:message for="txtCatImage" showSummary="false"/>
<p:commandButton id="btnSubmit"
actionListener="#{testManagedBean.insert}"
ajax="true" icon="ui-icon-check" value="Save"/>
</h:form>
</h:body>
</html>
测试托管bean：
@ManagedBean
@ViewScoped
public final class TestManagedBean implements Serializable {
private static final long serialVersionUID = 1L;
private UploadedFile uploadedFile;
public TestManagedBean(){}
public UploadedFile getUploadedFile() {
return uploadedFile;
}
public void setUploadedFile(UploadedFile uploadedFile) {
this.uploadedFile = uploadedFile;
}
public void fileUploadListener(FileUploadEvent event){
uploadedFile=event.getFile();
}
public void insert(){
if(uploadedFile!=null){
System.out.println(uploadedFile.getFileName());
}
else{
System.out.println("The file object is null.");
}
}
}
从文件浏览器上传文件时，它会在其监听器中显示文件名 - fileUploadListener()。
上传文件后，当按下给定的命令按钮（ajax="true"）时，会导致抛出以下异常。
WARNING: javax.servlet.ServletException: The request content-type is not a multipart/form-data
javax.faces.FacesException: javax.servlet.ServletException: The request content-type is not a multipart/form-data
at org.primefaces.component.fileupload.NativeFileUploadDecoder.decode(NativeFileUploadDecoder.java:44)
at org.primefaces.component.fileupload.FileUploadRenderer.decode(FileUploadRenderer.java:44)
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:1225)
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:1220)
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1220)
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 org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:344)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:70)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
at filter.NoCacheFilter.doFilter(NoCacheFilter.java:28)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:316)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
at java.lang.Thread.run(Thread.java:722)
Caused by: javax.servlet.ServletException: The request content-type is not a multipart/form-data
at org.apache.catalina.fileupload.Multipart.getPart(Multipart.java:187)
at org.apache.catalina.connector.Request.getPart(Request.java:4535)
at org.apache.catalina.connector.RequestFacade.getPart(RequestFacade.java:1095)
at org.primefaces.component.fileupload.NativeFileUploadDecoder.decodeAdvanced(NativeFileUploadDecoder.java:60)
at org.primefaces.component.fileupload.NativeFileUploadDecoder.decode(NativeFileUploadDecoder.java:37)
... 48 more
SEVERE: javax.servlet.ServletException: The request content-type is not a multipart/form-data
at org.apache.catalina.fileupload.Multipart.getPart(Multipart.java:187)
at org.apache.catalina.connector.Request.getPart(Request.java:4535)
at org.apache.catalina.connector.RequestFacade.getPart(RequestFacade.java:1095)
at org.primefaces.component.fileupload.NativeFileUploadDecoder.decodeAdvanced(NativeFileUploadDecoder.java:60)
at org.primefaces.component.fileupload.NativeFileUploadDecoder.decode(NativeFileUploadDecoder.java:37)
at org.primefaces.component.fileupload.FileUploadRenderer.decode(FileUploadRenderer.java:44)
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:1225)
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:1220)
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1220)
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 org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:344)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:70)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
at filter.NoCacheFilter.doFilter(NoCacheFilter.java:28)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:316)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
at java.lang.Thread.run(Thread.java:722)
只有当命令按钮的ajax属性设置为false时，它才能工作。ajax="false"。
我已将Tomcat 7.0.35中的Mojarra版本降级为2.1.9。它与此Mojarra版本以及PrimeFaces 4.0 final（以及PrimeFaces 4.0 RC1）一起工作 - 使用AJAX请求上传的文件。
我已尝试过以下Mojarra版本
在GlassFish 4.0中，但没有一个成功上传带有AJAX请求的文件，这是非常必要的，因为在PrimeFaces DataTable中使用<p:rowEditor/>（例如每行中的图像）编辑行始终是基于AJAX的
无论如何，我想保留GlassFish 4.0 。我还尝试在GlassFish 4.0中降级Mojarra 2.1.9，但它无法创建以异常结尾的bundle。 GlassFish 4.0似乎不适用于低于2.2.x的Mojarra。
那么，造成这种异常的原因是什么 - PrimeFaces或JSF？只是困惑。在这个给定的环境中，是否有使用AJAX请求上传文件的解决方法？
修改
web.xml中的过滤器映射：
<filter>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<filter-class>org.primefaces.webapp.filter.FileUploadFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<servlet-name>Faces Servlet</servlet-name>
</filter-mapping>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>
问题与2014年1月8日的Mojarra版2.2.5（或api，impl）released一起保持不变。
2014年3月4日再次尝试了Mojarra版本 2.2.6 （或api，impl）released。问题仍然存在完整。
2014年5月5日PrimeFaces 5.0最后released仍无效。
答案 0 :(得分：51)
正如Kai在当前问题的his answer中正确指出的那样，问题是由NativeFileUploadDecoder使用的FileUploadRenderer未检查请求是否为multipart/form-data引起的请求与否。当组件以提交“常规”ajax请求的形式出现时，这将导致麻烦。 CommonsFileUploadDecoder检查正确，这就是为什么它在没有本机文件上传解析器的JSF 2.1中正常工作的原因。
他使用自定义渲染器解决此问题的解决方案是正确的方向，但这种方法非常笨拙。在这种特殊情况下，绝对不需要对包含200多行的整个类进行复制，只是为了添加更多行。相反，只需完全扩展该类，并在委托给super之前使用if检查完全覆盖该方法，如下所示：
package com.example;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import org.primefaces.component.fileupload.FileUploadRenderer;
public class MyFileUploadRenderer extends FileUploadRenderer {
@Override
public void decode(FacesContext context, UIComponent component) {
if (context.getExternalContext().getRequestContentType().toLowerCase().startsWith("multipart/")) {
super.decode(context, component);
}
}
}
就是这样（尽管<renderer-kit>中保留了faces-config.xml条目。如果请求不是multipart请求，则无需继续解码。无论如何，文件部分都不可用（如果通过javax.servlet.*可以获得相同的功能，也无法回退到ExternalContext API。
答案 1 :(得分：34)
我有同样的问题。它似乎与<p:commandButton>比<p:fileUpload>组件更相关，因为它适用于<h:commandButton>（即使使用ajax）。
你可以尝试：
<h:commandButton id="btnSubmit" actionListener="#{testManagedBean.insert}" value="Save">
<f:ajax execute="@all" render="@form"/>
</h:commandButton>
我无法告诉你为什么或如何运作，但它解决了我的问题。 当然，缺点是，你必须自己做造型，至少要等到 Primefaces的人解决了这个问题。
修改：
在深入挖掘源代码并进行一些调试后，如果发现实际上有两个请求（我在<p:wizard/>中尝试过）。第一个是实际上传文件的multipart/form-data。它会触发Bean中的fileUploadEvent。我按下了向导 next 按钮，提交了另一个带有enctype application/www-urlencoded的表单。这会导致异常。结论是，与我在评论中所写的不同，抑制异常是一种有效的解决方案。这甚至可以通过不包括更改Primefaces.jar的方式来完成，如果这些人在将来的版本中解决问题，这将很方便。
所以这是需要做的事情：
com.yourpackage.fileupload.FileUploadRenderer 将以下代码复制并粘贴到新课程中：
package com.yourpackage.fileupload.fileupload;
import java.io.IOException;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.servlet.http.HttpServletRequest;
import org.primefaces.component.fileupload.CommonsFileUploadDecoder;
import org.primefaces.component.fileupload.FileUpload;
import org.primefaces.component.fileupload.NativeFileUploadDecoder;
import org.primefaces.config.ConfigContainer;
import org.primefaces.context.RequestContext;
import org.primefaces.expression.SearchExpressionFacade;
import org.primefaces.renderkit.CoreRenderer;
import org.primefaces.util.HTML;
import org.primefaces.util.WidgetBuilder;
public class FileUploadRenderer extends CoreRenderer {
@Override
public void decode(FacesContext context, UIComponent component) {
FileUpload fileUpload = (FileUpload) component;
if (!fileUpload.isDisabled()) {
ConfigContainer cc = RequestContext.getCurrentInstance().getApplicationContext().getConfig();
String uploader = cc.getUploader();
boolean isAtLeastJSF22 = cc.isAtLeastJSF22();
if (uploader.equals("auto")) {
if (isAtLeastJSF22) {
if (isMultiPartRequest(context)) {
NativeFileUploadDecoder.decode(context, fileUpload);
}
} else {
CommonsFileUploadDecoder.decode(context, fileUpload);
}
} else if (uploader.equals("native")) {
if (!isAtLeastJSF22) {
throw new FacesException("native uploader requires at least a JSF 2.2 runtime");
}
NativeFileUploadDecoder.decode(context, fileUpload);
} else if (uploader.equals("commons")) {
CommonsFileUploadDecoder.decode(context, fileUpload);
}
}
}
@Override
public void encodeEnd(FacesContext context, UIComponent component) throws IOException {
FileUpload fileUpload = (FileUpload) component;
encodeMarkup(context, fileUpload);
if (fileUpload.getMode().equals("advanced")) {
encodeScript(context, fileUpload);
}
}
protected void encodeScript(FacesContext context, FileUpload fileUpload) throws IOException {
String clientId = fileUpload.getClientId(context);
String update = fileUpload.getUpdate();
String process = fileUpload.getProcess();
WidgetBuilder wb = getWidgetBuilder(context);
wb.initWithDomReady("FileUpload", fileUpload.resolveWidgetVar(), clientId, "fileupload");
wb.attr("auto", fileUpload.isAuto(), false)
.attr("dnd", fileUpload.isDragDropSupport(), true)
.attr("update", SearchExpressionFacade.resolveComponentsForClient(context, fileUpload, update), null)
.attr("process", SearchExpressionFacade.resolveComponentsForClient(context, fileUpload, process), null)
.attr("maxFileSize", fileUpload.getSizeLimit(), Long.MAX_VALUE)
.attr("fileLimit", fileUpload.getFileLimit(), Integer.MAX_VALUE)
.attr("invalidFileMessage", fileUpload.getInvalidFileMessage(), null)
.attr("invalidSizeMessage", fileUpload.getInvalidSizeMessage(), null)
.attr("fileLimitMessage", fileUpload.getFileLimitMessage(), null)
.attr("messageTemplate", fileUpload.getMessageTemplate(), null)
.attr("previewWidth", fileUpload.getPreviewWidth(), 80)
.attr("disabled", fileUpload.isDisabled(), false)
.callback("onstart", "function()", fileUpload.getOnstart())
.callback("onerror", "function()", fileUpload.getOnerror())
.callback("oncomplete", "function()", fileUpload.getOncomplete());
if (fileUpload.getAllowTypes() != null) {
wb.append(",allowTypes:").append(fileUpload.getAllowTypes());
}
wb.finish();
}
protected void encodeMarkup(FacesContext context, FileUpload fileUpload) throws IOException {
if (fileUpload.getMode().equals("simple")) {
encodeSimpleMarkup(context, fileUpload);
} else {
encodeAdvancedMarkup(context, fileUpload);
}
}
protected void encodeAdvancedMarkup(FacesContext context, FileUpload fileUpload) throws IOException {
ResponseWriter writer = context.getResponseWriter();
String clientId = fileUpload.getClientId(context);
String style = fileUpload.getStyle();
String styleClass = fileUpload.getStyleClass();
styleClass = styleClass == null ? FileUpload.CONTAINER_CLASS : FileUpload.CONTAINER_CLASS + " " + styleClass;
boolean disabled = fileUpload.isDisabled();
writer.startElement("div", fileUpload);
writer.writeAttribute("id", clientId, "id");
writer.writeAttribute("class", styleClass, styleClass);
if (style != null) {
writer.writeAttribute("style", style, "style");
}
//buttonbar
writer.startElement("div", fileUpload);
writer.writeAttribute("class", FileUpload.BUTTON_BAR_CLASS, null);
//choose button
encodeChooseButton(context, fileUpload, disabled);
if (!fileUpload.isAuto()) {
encodeButton(context, fileUpload.getUploadLabel(), FileUpload.UPLOAD_BUTTON_CLASS, "ui-icon-arrowreturnthick-1-n");
encodeButton(context, fileUpload.getCancelLabel(), FileUpload.CANCEL_BUTTON_CLASS, "ui-icon-cancel");
}
writer.endElement("div");
//content
writer.startElement("div", null);
writer.writeAttribute("class", FileUpload.CONTENT_CLASS, null);
writer.startElement("table", null);
writer.writeAttribute("class", FileUpload.FILES_CLASS, null);
writer.startElement("tbody", null);
writer.endElement("tbody");
writer.endElement("table");
writer.endElement("div");
writer.endElement("div");
}
protected void encodeSimpleMarkup(FacesContext context, FileUpload fileUpload) throws IOException {
encodeInputField(context, fileUpload, fileUpload.getClientId(context));
}
protected void encodeChooseButton(FacesContext context, FileUpload fileUpload, boolean disabled) throws IOException {
ResponseWriter writer = context.getResponseWriter();
String clientId = fileUpload.getClientId(context);
String cssClass = HTML.BUTTON_TEXT_ICON_LEFT_BUTTON_CLASS + " " + FileUpload.CHOOSE_BUTTON_CLASS;
if (disabled) {
cssClass += " ui-state-disabled";
}
writer.startElement("span", null);
writer.writeAttribute("class", cssClass, null);
//button icon
writer.startElement("span", null);
writer.writeAttribute("class", HTML.BUTTON_LEFT_ICON_CLASS + " ui-icon-plusthick", null);
writer.endElement("span");
//text
writer.startElement("span", null);
writer.writeAttribute("class", HTML.BUTTON_TEXT_CLASS, null);
writer.writeText(fileUpload.getLabel(), "value");
writer.endElement("span");
if (!disabled) {
encodeInputField(context, fileUpload, clientId + "_input");
}
writer.endElement("span");
}
protected void encodeInputField(FacesContext context, FileUpload fileUpload, String clientId) throws IOException {
ResponseWriter writer = context.getResponseWriter();
writer.startElement("input", null);
writer.writeAttribute("type", "file", null);
writer.writeAttribute("id", clientId, null);
writer.writeAttribute("name", clientId, null);
if (fileUpload.isMultiple()) {
writer.writeAttribute("multiple", "multiple", null);
}
if (fileUpload.getStyle() != null) {
writer.writeAttribute("style", fileUpload.getStyle(), "style");
}
if (fileUpload.getStyleClass() != null) {
writer.writeAttribute("class", fileUpload.getStyleClass(), "styleClass");
}
if (fileUpload.isDisabled()) {
writer.writeAttribute("disabled", "disabled", "disabled");
}
writer.endElement("input");
}
protected void encodeButton(FacesContext context, String label, String styleClass, String icon) throws IOException {
ResponseWriter writer = context.getResponseWriter();
String cssClass = HTML.BUTTON_TEXT_ICON_LEFT_BUTTON_CLASS + " ui-state-disabled " + styleClass;
writer.startElement("button", null);
writer.writeAttribute("type", "button", null);
writer.writeAttribute("class", cssClass, null);
writer.writeAttribute("disabled", "disabled", null);
//button icon
String iconClass = HTML.BUTTON_LEFT_ICON_CLASS;
writer.startElement("span", null);
writer.writeAttribute("class", iconClass + " " + icon, null);
writer.endElement("span");
//text
writer.startElement("span", null);
writer.writeAttribute("class", HTML.BUTTON_TEXT_CLASS, null);
writer.writeText(label, "value");
writer.endElement("span");
writer.endElement("button");
}
private boolean isMultiPartRequest(FacesContext context) {
if (context == null) {
return false;
}
return ((HttpServletRequest) context.getExternalContext().getRequest()).getContentType().startsWith("multipart");
}
}
在faces-config.xml：
<render-kit>
<renderer>
<component-family>org.primefaces.component</component-family>
<renderer-type>org.primefaces.component.FileUploadRenderer</renderer-type>
<renderer-class>com.yourpackage.fileupload.FileUploadRenderer</renderer-class>
</renderer>
</render-kit>
你准备好了！
我们做了什么？我们创建了自己的FileUploadRenderer，它使用方法multipart/form-data检查contentType是否真的isMultiPartRequest()。只有在返回true时才执行其余代码。在任何其他情况下都不会发生任何事情，这意味着不会抛出任何异常。如果Primefaces修复了此问题，您只需要删除faces-config.xml中的行以使用他们的类。
请告诉我这是否适合您！
修改
此代码检查给定请求是否为multipart / form-data类型。如果不是执行被停止。无论如何，原始Primefaces代码将继续。正如我上面提到的，如果你在Primefaces组件中上传文件，实际上有两个请求：
<p:fileUpload/>的Ajax-FileUpload（enctype：multipart/form-data）<p:editRow/>或<p:wizard/>中的Ajax操作（enctype：application/www-form-urlencoded）第一个由渲染器处理，而第二个在原始代码中导致异常，因为渲染器尝试处理它不具备的内容。通过代码中所做的更改，只有multipart/form-data表单由呈现器处理，因此不会发生异常。 IMO显然是Primefaces来源中的一个错误。代码差异只是方法private boolean isMultiPartRequest(FacesContext context)及其在代码中的一次出现。很高兴我能帮到你！
答案 2 :(得分：9)
虽然这已经过时并且已经回答了，但我想分享一些内容，以防万一你错过了： PrimeFaces 4+现在有一个上下文参数，您可以使用它（在web.xml中）手动选择应该使用哪个上传器（native-servlet3或commons）。您可以使用它来强制这样的公共上传者：
<context-param>
<param-name>primefaces.UPLOADER</param-name>
<param-value>commons</param-value>
</context-param>
（当然你仍然需要FileUploadFilter，如上所述和指南中所述）。 有关详细信息，请参阅PrimeFaces用户指南。
答案 3 :(得分：2)
@BalusC - 您对扩展现有FileUploadRenderer的建议非常简洁。谢谢！
根据您使用的JSF版本，您可能会看到随机弹出的iFrame。这是一个错误：JAVASERVERFACES-2843
在我第一次尝试修复此问题时（无需升级到2.2.1）我只是用CSS隐藏了iFrame。
#JSFFrameId {
visibility:hidden;
}
这有效但由于某种原因，其他AJAX提交不会触发。然后我调用了一个小脚本来删除iFrame并修复了问题。
<h:commandButton id="btnSubmit" action="#{fileUploadController.upload}" value="Save" >
<f:ajax execute="@all" render="frmMain" onevent="removeIFrame()" />
</h:commandButton>
JavaScript的：
function removeIFrame()
{
document.getElementById("JSFFrameId").removeNode();
}
答案 4 :(得分：0)
我有同样的问题， 在我的情况下，我在数据表中使用了primefaces文件上传器，尝试使用onRowEdit修改现有图像，最终导致上面提到的相同错误。 然后我将primefaces jar更改为5.1版本。现在工作正常。