Primefaces 中upload 如何不显示呢

Primefaces 中upload 怎么不显示呢
java
package com.mytest;

import org.primefaces.model.UploadedFile;

import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.context.FacesContext;

/**
 * Created with IntelliJ IDEA.
 * User: Administrator
 * Date: 13-4-17
 * Time: 下午3:57
 * To change this template use File | Settings | File Templates.
 */

@ManagedBean
@RequestScoped
public class FileUploadBean {
    private UploadedFile file;

    public UploadedFile getFile() {
        return file;
    }

    public void setFile(UploadedFile file) {
        this.file = file;
    }

    public void upload() {
        FacesMessage msg = new FacesMessage("Successful", file.getFileName() + " is uploaded.");
        FacesContext.getCurrentInstance().addMessage(null, msg);
    }

}

xhtml

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
                xmlns:ui="http://java.sun.com/jsf/facelets"
                xmlns:h="http://java.sun.com/jsf/html"
                xmlns:p="http://primefaces.org/ui"
                template="../templates/ui.xhtml">

    <ui:define name="content">
        <div 

           xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
  http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
           version="2.5">
    <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>/faces/*</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.faces</url-pattern>
    </servlet-mapping>
</web-app>