>我正在使用Primefaces p：galleria来显示一些图像，但是它根本没有显示任何内容，
<p:galleria value="#{galleriaBean.images}"
var="image"
effect="slide"
effectSpeed="1000"
panelWidth="500"
panelHeight="313"
showCaption="false">
<p:graphicImage value="/resources/Tutorial/#{image}"
alt="Image Description for #{image}"
title="#{image}"/>
</p:galleria>
豆子画廊.java
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package richard.fileupload;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.bean.ViewScoped;
/**
*
* @author Richard
*/
@ManagedBean(name="galleriaBean")
//@RequestScoped
@ViewScoped
public class GalleriaBean {
public static List<String> images;
@PostConstruct
public void init() {
System.out.println("init called");
images = new ArrayList<String>();
for(int i=1;i<=25;i++) {
images.add("/resources/Tutorial"+i+".jpg");
}
}
public List<String> getImages() {
return images;
}
}
图像存储在/resources/Tutorial 中
我做错了什么？ 我看过素数示例，我的看起来很相似，但运行时没有显示任何内容:(
我现在得到这个巨大的错误：
INFO: init called
WARNING: Setting non-serializable attribute value into ViewMap: (key: galleriaBean, value class: richard.fileupload.GalleriaBean)
SEVERE: Error Rendering Vi
ew[/GUI/tutorial.xhtml]
java.lang.IllegalStateException: PWC3999: Cannot create a session after the response has been committed
at org.apache.catalina.connector.Request.doGetSession(Request.java:2886)
at org.apache.catalina.connector.Request.getSession(Request.java:2583)
at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:920)
at com.sun.faces.context.ExternalContextImpl.getSession(ExternalContextImpl.java:155)
at com.sun.faces.renderkit.ServerSideStateHelper.writeState(ServerSideStateHelper.java:175)
at com.sun.faces.renderkit.ResponseStateManagerImpl.writeState(ResponseStateManagerImpl.java:122)
at com.sun.faces.application.StateManagerImpl.writeState(StateManagerImpl.java:166)
at com.sun.faces.application.view.WriteBehindStateWriter.flushToWriter(WriteBehindStateWriter.java:225)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:419)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
INFO: Exception when handling error trying to reset the response.
java.lang.IllegalStateException: PWC3999: Cannot create a session after the response has been committed
at org.apache.catalina.connector.Request.doGetSession(Request.java:2886)
at org.apache.catalina.connector.Request.getSession(Request.java:2583)
at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:920)
at com.sun.faces.context.ExternalContextImpl.getSession(ExternalContextImpl.java:155)
at com.sun.faces.renderkit.ServerSideStateHelper.writeState(ServerSideStateHelper.java:175)
at com.sun.faces.renderkit.ResponseStateManagerImpl.writeState(ResponseStateManagerImpl.java:122)
at com.sun.faces.application.StateManagerImpl.writeState(StateManagerImpl.java:166)
at com.sun.faces.application.view.WriteBehindStateWriter.flushToWriter(WriteBehindStateWriter.java:225)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:419)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
WARNING: JSF1087: Unable to generate Facelets error page as the response has already been committed.
SEVERE: javax.faces.FacesException: PWC3999: Cannot create a session after the response has been committed
javax.faces.FacesException: PWC3999: Cannot create a session after the response has been committed
at com.sun.faces.context.ExceptionHandlerImpl.handle(ExceptionHandlerImpl.java:142)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:119)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.IllegalStateException: PWC3999: Cannot create a session after the response has been committed
at org.apache.catalina.connector.Request.doGetSession(Request.java:2886)
at org.apache.catalina.connector.Request.getSession(Request.java:2583)
at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:920)
at com.sun.faces.context.ExternalContextImpl.getSession(ExternalContextImpl.java:155)
at com.sun.faces.renderkit.ServerSideStateHelper.writeState(ServerSideStateHelper.java:175)
at com.sun.faces.renderkit.ResponseStateManagerImpl.writeState(ResponseStateManagerImpl.java:122)
at com.sun.faces.application.StateManagerImpl.writeState(StateManagerImpl.java:166)
at com.sun.faces.application.view.WriteBehindStateWriter.flushToWriter(WriteBehindStateWriter.java:225)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:419)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
... 31 more
但初始化被称为:D
编辑：现在将其归结为1个错误：
WARNING: Setting non-serializable attribute value into ViewMap: (key: galleriaBean, value class: richard.fileupload.GalleriaBean)
当前代码：现在没有收到任何错误，但它也没有显示任何内容
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package richard.fileupload;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.bean.ViewScoped;
import javax.faces.context.FacesContext;
/**
*
* @author Richard
*/
@ManagedBean(name="galleriaBean")
//@RequestScoped
@ViewScoped
public class GalleriaBean implements Serializable {
public static List<String> images;
@PostConstruct
public void init() {
FacesContext.getCurrentInstance().getExternalContext().getSession(true);
System.out.println("init called"); //testing to see if it called, currently causing a lot of errors
images = new ArrayList<String>();
for(int i=1;i<=3;i++) {
System.out.println("loop called"); //testing to see if it called, currently causing a lot of errors
images.add("/resources/Tutorial/"+ i +".jpeg");
}
}
public List<String> getImages() {
System.out.println("getImages called"); //testing to see if it called, currently causing a lot of errors
return images;
}
}
控制台 ：
INFO: init called
INFO: loop called
INFO: loop called
INFO: loop called
INFO: getImages called
全部调用，但仍然不显示任何内容
编辑：
感谢您的帮助，我已经按照您的建议更改了文件位置并检查了 chrome 中的控制台，你是对的，我收到一个 404 未找到错误，但是即使在更改为您的位置后我也得到这个，
我的文件目录是
WebContent
|-- META-INF
|-- WEB-INF
|-- GUI
| `-- tutorial.xhtml (page calling the images)
|-- resources
| `-- Tutorial
| |-- Tutorial1.jpg
| |-- Tutorial2.jpg
| |-- Tutorial3.jpg
| : :
|
但是使用Chromes控制台，我能够看到它正在尝试查找/fileuploadWithPreview//GUI/Tutorial/Tutorial中的图像，但它们存储在resources/tutorial/
新问题是我如何让它调用 xhtml 文件所在的 GUI 文件夹之外的资源文件夹
图像URL至少非常奇怪。
这里
for(int i=1;i<=25;i++) {
images.add("/resources/Tutorial"+i+".jpg");
}
您正在指定完整的 Web 内容相对 URL。
而在这里，
<p:graphicImage value="/resources/Tutorial/#{image}" ... />
您假设图像 URL 相对于 /resources/Tutorial 。
因此，您的图像URL最终会像
/resources/Tutorial/resources/Tutorial1.jpg
两次/resources？这似乎不对。如果您已经注意到网络浏览器开发人员工具集中的HTTP流量（在Chrome/IE9/Firebug中按F12），那么您应该已经注意到浏览器在所有这些图像上都收到了404 Page Not Found错误。另外，如果您注意了生成的 HTML <img>元素的src，您应该已经注意到有些地方不对劲。
假设您在/resources/Tutorial文件夹中有Tutorial[n].jpg图像，
WebContent
|-- META-INF
|-- WEB-INF
|-- resources
| `-- Tutorial
| |-- Tutorial1.jpg
| |-- Tutorial2.jpg
| |-- Tutorial3.jpg
| : :
|
`-- page.xhtml
然后，您应该准备映像文件名，如下所示：
for(int i=1;i<=25;i++) {
images.add("Tutorial"+i+".jpg");
}
并按如下方式引用它们（注意：name，而不是value！
<p:graphicImage name="Tutorial/#{image}" ... />
至于PWC3999例外，这涉及一个完全不同的问题。如何解决它，请查看添加 <h：form> 导致 java.lang.IllegalStateException：在提交响应后无法创建会话。换句话说，只需升级Mojarra。
至于不可序列化的属性警告，只需让提到的类实现Serializable即可。