记录控制台图像graphicImage Primefaces时出错？

Question

如上解决了使用组件 PrimeFaces“graphicImage”从另一个控制器加载图像时的问题我现在遇到的问题是当我将图像刻录到本地地址时，我会生成 PrimeFaces 错误，但显然不会影响我当前的功能。

图像加载使 setAddAttributes 方法，问题是我注意到当我去方法记录 setSaveAttributes 发生的事情顺利记录了我的数据，但离开我控制台中的这个异常，我认为它必须这样做，该实用程序是 SessionScoped 管理（但它不承认我和我管理生成一个 null）。

<p:graphicImage value="#{mGraficoImagen.graphicImage}" cache="false" />

主管理控制器：

@ManagedBean
@ViewScoped
public class CMantConsultaProductosList {

    @ManagedProperty(value="#{mGraficoImagen}")
    private MGraficoImagen mGraficoImagen;  

    private MProductoBean mantForm;

    @PostConstruct
    public void setViewAtributes() {
        MProductoBean mantForm = new MProductoBean();
        mantForm.setVnomImagen("fancoil-fn.png");
    }


    public void setAddAttributes(ActionEvent e) {
        StringBuilder archivoImagen = new StringBuilder();
        archivoImagen.append("C://images//");
        archivoImagen.append(mantForm.getVnombreImagen());      
        this.mGraficoImagen.setGraphicImage(new DefaultStreamedContent(new FileInputStream(archivoImagen.toString()),
                                            "image/png",
                                             mantForm.getVnombreImagen()));
    }

    public void setSaveAttributes(ActionEvent e)  {
         .........

         iProductoService.grabarProducto(mantBean);
   }

    /* get and set */
}

实用程序管理：

@SessionScoped
@ManagedBean(name = "mGraficoImagen")
public class MGraficoImagen implements Serializable {

    private static final long serialVersionUID = 1L;
    private StreamedContent graphicImage;

    /**
     * @return the graphicImage
     */
    public StreamedContent getGraphicImage() {
        return graphicImage;
    }

    /**
     * @param graphicImage the graphicImage to set
     */
    public void setGraphicImage(StreamedContent graphicImage) {
        this.graphicImage = graphicImage;
    }

}

错误控制台：

feb 04, 2015 5:11:44 PM org.primefaces.application.resource.StreamedContentHandler handle
Grave: Error in streaming dynamic resource. Stream Closed
feb 04, 2015 5:11:44 PM org.apache.catalina.core.StandardWrapperValve invoke
Grave: Servlet.service() para servlet Faces_Servlet lanzó excepción
java.io.IOException: java.io.IOException: Stream Closed
    at org.primefaces.application.resource.StreamedContentHandler.handle(StreamedContentHandler.java:78)
    at org.primefaces.application.resource.PrimeResourceHandler.handleResourceRequest(PrimeResourceHandler.java:72)
    at javax.faces.application.ResourceHandlerWrapper.handleResourceRequest(ResourceHandlerWrapper.java:153)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:643)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:72)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.sgkyros.common.filter.EncodingFilter.doFilter(EncodingFilter.java:36)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:125)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: java.io.IOException: Stream Closed
    at java.io.FileInputStream.readBytes(Native Method)
    at java.io.FileInputStream.read(FileInputStream.java:243)
    at org.primefaces.application.resource.StreamedContentHandler.handle(StreamedContentHandler.java:68)

Answer 1

InputStream 只能读取一次（然后将其关闭，从而释放昂贵的文件资源）。然而，您似乎将其分配为会话范围 bean 的属性，这意味着它将被多次读取。

这一切都是错误的。您应该使用无状态 bean，它在 getter 方法内的 method local scope 中创建并保留 StreamedContent 实例。您永远不应将其分配为 bean 属性，而仅在浏览器实际请求图像时才创建它。您可以通过嵌套在 <p:graphicImage> 中的 <f:param> 将图像标识符（例如文件名或 DB PK）作为请求参数传递来使其动态化。

This was fleshed out and explained so many times before，在这个答案中的其他人：Display dynamic image from database with p:graphicImage and StreamedContent。