Question

这是参考以下主题 [File upload doesn't work with AJAX in PrimeFaces 4.0/JSF 2.2.x - javax.servlet.ServletException: The request content-type is not a multipart/form-data

我遇到的问题是单击命令按钮时的Nullpointer。

从 web.xml

开始

<context-param>
    <param-name>primefaces.UPLOADER</param-name>
    <param-value>commons</param-value>
</context-param>

XHTML

<p:fileUpload id="file" value="#{userBean.uploadedFile}"
                    mode="simple" required="true" allowTypes="*.xls,*.xlsx"
                    requiredMessage="#{msg.vrUserUpload}"
                    invalidFileMessage="#{msg.vrUserUploadInvalidFile}"
                    multiple="false" fileUploadListener="userBean.fileUploadListener" />

<p:commandButton id="btnUpload" value="#{displayText.btUpload}"
                        styleClass="button_lite" actionListener="#{userBean.insert}"
                        ajax="true" update="userMassUploadForm"
                        process="userMassUploadForm">
                    </p:commandButton>

UserBean.java

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.");
            }
    }

控制台打印出＆＃34;文件对象为空。＆＃34;每当ajax =＆＃34; true＆＃34;当设置为false时，工作。我在上面提到的帖子中找不到解决方案。如果您想了解更多信息，请告知我们。

Answer 1

来自PrimeFaces user guide：

简单文件上传

简单文件上载模式在传统模式下工作，文件输入的值应为UploadedFile实例。简单上传不支持Ajax上传。

Primefaces fileupload mode =“Simple”with commandbutton ajax =“true”抛出nullpointer异常

1 个答案: