Primefaces downloadFile產生java.io.IOException：流關閉後，第二次

Question

我有primefaces 5.0分量p問題：fileDownload，我有以下豆店DefaultStreamedContent，我也得到保存，以簡單地下載它的價值：

豆：

public class EBMail implements Serializable { 
    private DefaultStreamedContent attachment; 
    // @ here setter and getter too . 
} 

和XHTML文件：

<p:commandLink ajax="false" value="Download Attachment" rendered="#{mbMail.attachment != null}"> 
    <p:fileDownload value="#{mbMail.attachment}" /> 
</p:commandLink> 

我得到了第一次郵件附件文件，在第二次我得到以下異常：

WARNING: java.io.IOException: Stream Closed 
javax.faces.FacesException: java.io.IOException: Stream Closed 
    at org.primefaces.component.filedownload.FileDownloadActionListener.processAction(FileDownloadActionListener.java:87) 
    at javax.faces.event.ActionEvent.processListener(ActionEvent.java:88) 
    at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:813) 
    at javax.faces.component.UICommand.broadcast(UICommand.java:300) 
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790) 
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282) 
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81) 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) 
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198) 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) 
    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.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) 
    at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:44) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) 
    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:1070) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    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.component.filedownload.FileDownloadActionListener.processAction(FileDownloadActionListener.java:77) 
    ... 30 more 

org.apache.catalina.core.StandardWrapperValve invoke 
SEVERE: Servlet.service() for servlet [FacesServlet] in context with path [/faces] threw exception 
java.lang.IllegalStateException: getOutputStream() has already been called for this response 
    at org.apache.catalina.connector.Response.getWriter(Response.java:648) 
    at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:213) 
    at com.sun.faces.context.ExternalContextImpl.getResponseOutputWriter(ExternalContextImpl.java:846) 
    at com.sun.faces.context.PartialViewContextImpl.createPartialResponseWriter(PartialViewContextImpl.java:504) 
    at com.sun.faces.context.PartialViewContextImpl.access$300(PartialViewContextImpl.java:79) 
    at com.sun.faces.context.PartialViewContextImpl$DelayedInitPartialResponseWriter.getWrapped(PartialViewContextImpl.java:642) 
    at javax.faces.context.PartialResponseWriter.startDocument(PartialResponseWriter.java:120) 
    at org.omnifaces.context.OmniPartialViewContext$OmniPartialResponseWriter.startDocument(OmniPartialViewContext.java:270) 
    at org.primefaces.context.PrimePartialResponseWriter.startDocument(PrimePartialResponseWriter.java:152) 
    at com.sun.faces.context.AjaxExceptionHandlerImpl.handlePartialResponseError(AjaxExceptionHandlerImpl.java:201) 
    at com.sun.faces.context.AjaxExceptionHandlerImpl.handle(AjaxExceptionHandlerImpl.java:126) 
    at javax.faces.context.ExceptionHandlerWrapper.handle(ExceptionHandlerWrapper.java:100) 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:119) 
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198) 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) 
    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.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) 
    at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:44) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) 
    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:1070) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    at java.lang.Thread.run(Thread.java:744) 

我對JFS 2.2.7運行，Primefaces 5.0，我上傳文件到豆我的問題，當我下載了它第二次，甚至另一個對象的郵件「。

任何解決方案，我看了很多解決方案，沒有任何幫助或我已經測試過。

Answer 1

我解決了問題，最後，我作出新的類庫我的數據，並且在操作準備流從我的類對象下載，當下載文件，我從我的課字節讀取的字節，如下所示：

類：

public class Attachment implements Serializable { 

    private String name; 
    private String type; 
    private String encoding; 
    private byte[] data; 

    // ... Setters and getters ... 

    public Attachment() { 
     this.encoding = "UTF-8"; 
    } 

} 

豆：

public class MailBean implements Serializable { 
    // alot of properties 
    private Attachment attachment; 
    // setters and getters 
} 

託管Bean：

public class MailManagedBean implements Serializable { 
    private DefaultStreamedContent attachmentToDownload; 
    private MailBean mail; 
    // @ here setter and getter too . 

    public void prepare() { 
     InputStream stream = new ByteArrayInputStream(mail.getAttachment.getData()); 
     attachmentToDownload = new DefaultStreamedContent(stream, mail.getAttachment.getType(), mail.getAttachment.getName(), mail.getAttachment.getEncoding()); 
    } 
} 

在XHTML文件（I加入動作）：

<p:commandLink ajax="false" value="Download Attachment" 
    rendered="#{mbMail.mail.attachment != null}" action="#{mbMail.prepare()}"> 
    <p:fileDownload value="#{mbMail.attachmentToDownload}" /> 
</p:commandLink>