p:fileUpload中的监听器方法永远不会在primefaces中调用

Question

我正在尝试使用primefaces上传图像,并且不调用fileUploadListener.

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

        <p:fileUpload fileUploadListener="#{fileUploadController.handleFileUpload}"
        mode="advanced" 
        update="messages"
        sizeLimit="100000" 
        allowTypes="/(\.|\/)(gif|jpe?g|png)$/"/>

<p:growl id="messages" showDetail="true"/>

这是豆子:

@ManagedBean
@RequestScoped
public class FileUploadController {
    public void handleFileUpload(FileUploadEvent event) throws Exception {
      System.out.println("OOOOOOOOOOOOOOOOOOK");
            File targetFolder = new File("C:/Uploads");
            InputStream inputStream = event.getFile().getInputstream();
            OutputStream out = new FileOutputStream(new File(targetFolder,
                    event.getFile().getFileName()));
            int read = 0;
            byte[] bytes = new byte[1024];

            while ((read = inputStream.read(bytes)) != -1) {
                out.write(bytes, 0, read);
            }
            inputStream.close();
            out.flush();
            out.close();  

    }
}

这是web.xml配置:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<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>
<dispatcher>FORWARD</dispatcher>
</filter-mapping>
  <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Development</param-value>
    </context-param>
    <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>/faces/*</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>faces/index.xhtml</welcome-file>
    </welcome-file-list>
</web-app>

我还在类路径中添加了commons-fileupload和Commons-io jar.我不明白为什么不调用handleFileUpload.

Answer 1

您已明确配置文件上载过滤器以FORWARD仅侦听调度程序.

您需要从筛选器映射中删除以下条目,以便它REQUEST仅在调度程序上默认侦听:

<dispatcher>FORWARD</dispatcher>

或者,增加了REQUEST调度员的过滤器映射,以便它在正常运行的要求,以及:

<dispatcher>REQUEST</dispatcher>
<dispatcher>FORWARD</dispatcher>

该FORWARD调度是唯一的强制性的时候RequestDispatcher#forward()是被调用之前被调用过滤器.例如,通过一些URL重写解决方案,如PrettyFaces.然而,到目前为止在问题中提供的信息似乎并未以任何方式表明您正在使用该信息.

与具体问题无关,因为PrimeFaces文件上传需要Apache Commons IO,您可能需要考虑IOUtils#copy()而不是那个详细的输入/输出流循环.另请参见:如何在JSF中保存上载的文件.