t:inputFileUpload 在提交表单时总是返回 null答案

【问题标题】：t:inputFileUpload always return null while submitting formt:inputFileUpload 在提交表单时总是返回 null
【发布时间】：2012-12-29 18:23:02
【问题描述】：

<h:body>
  <div id="main" align="center" style="width:100%;height: 100%">
    <f:view>
      <h:form id="catform" enctype="multipart/form-data">
        <p:panel styleClass="ui-panel-titlebar"  id="panel1" header="Add New Category" >
          <h:panelGrid columns="3" style="border:0px"  styleClass="ui-panel-content">
            <h:outputText value="Parent Category:"  />
            <h:selectOneMenu id="parentcat" value="#{CategoryMB.selectedCatId}">
              <f:selectItems value="#{CategoryMB.categories}" var="cat" itemLabel="#{cat.categoryName}" itemValue="#{CategoryMB.categoryId}" />
            </h:selectOneMenu>

            <p:message for="parentcat" />

            <h:outputText value="Category Name:" />
            <p:inputText id="catname" value="#{CategoryMB.catName}" required="true" requiredMessage="Category must requried !" />

            <p:message for="catname" />

            <h:outputText value="Category Logo:" />

            <t:inputFileUpload storage="file" id="catImageUpload" value="#{CategoryMB.file}" style="display: inline;vertical-align: baseline;margin-bottom: 10px;"/>

            <h:message for="catImageUpload" />

            <h:outputText value="Description" />

            <p:inputTextarea id="desc" cols="10"  autoResize="false" rows="4" value="#{CategoryMB.description}"></p:inputTextarea>

            <p:message for="desc" id="descmsg" />

            <f:facet name="footer">

              <p:commandButton value="Add Category" update="growl" action="#{CategoryMB.addCategory}" icon="ui-icon-check" />

            </f:facet>
          </h:panelGrid>
        </p:panel>

        <p:growl id="growl" showDetail="true" life="5000" />

      </h:form>
    </f:view>

public void UploadImage() { 

    System.out.println("hi");

    UploadedFile myfile = getFile();

    byte[] buffer = null;

    File tempfile=null;

    if(myfile!=null)
    {
        String prefix = FilenameUtils.getBaseName(myfile.getName());
        String suffix = FilenameUtils.getExtension(myfile.getName());

        try
        {

            realPath= FacesContext.getCurrentInstance().getExternalContext().getRealPath("/Resources/CategoryImage");

            tempfile = File.createTempFile(prefix + "_", "." + suffix, new File(realPath));

            OutputStream out = new FileOutputStream(tempfile);

            InputStream in = new BufferedInputStream(myfile.getInputStream());

            this.catImage = tempfile.getName();                

            try {

                buffer = new byte[64 * 1024];

                int count;

                while ((count = in.read(buffer)) > 0)
                    out.write(buffer, 0, count);

            } finally {

                in.close();

                out.close();

            }   

            FacesContext context = FacesContext.getCurrentInstance();  

            context.addMessage(null, new FacesMessage("Successful", "Successfully added category! " + catName));  

        }
        catch(IOException e)
        {   
            e.printStackTrace();
        }   
    }

【问题讨论】：

标签： jsf file-upload primefaces myfaces tomahawk

【解决方案1】：

<p:commandButton>默认发送ajax请求，不支持ajax上传文件。为此，您应该改用<p:fileUpload mode="advanced">。

将ajax="false" 添加到<p:commandButton> 以将其关闭。

<p:commandButton ... ajax="false" />

请注意，<p:fileUpload mode="simple">，也可以用来代替战斧<t:inputFileUpload>，也需要这个。

与具体问题无关，将上传的文件写入扩展的 WAR 文件夹是一个非常糟糕的想法。原因 #1 是当您重新部署 WAR 甚至重新启动服务器时，它们都会丢失，原因很简单，它们不包含在原始 WAR 中。将它们存放在其他更永久的位置。另请参阅此相关答案：Uploaded image only available after refreshing the page。

【讨论】：