Lendo o livro Seam in action vi que existe um código que facilita a download de arquivos utilizando o Seam.
Segue o trecho do livro.@Name("publicacaoHome")
@Import("org.jboss.seam.*")
public class PublicacaoHome extends EntityHome<Publicacao>
{
/**
*
*/
private static final long serialVersionUID = -2796591351249381310L;
@RequestParameter Long publicacaoId;
@In
private Identity identity;
@In
private DocumentStore documentStore;
@In
private Manager manager;
@In
private FacesContext facesContext;
@Override
public Object getId()
{
if (publicacaoId == null)
{
return super.getId();
}
else
{
return publicacaoId;
}
}
@Override @Begin
public void create() {
super.create();
super.create();
ValueExpression createdMessage = createValueExpression("#{messages['publicacao.action.salvar.mensagem']}");
setCreatedMessage(createdMessage);
ValueExpression updatedMessage = createValueExpression("#{messages['publicacao.action.alterar.mensagem']}");
setUpdatedMessage(updatedMessage);
ValueExpression deletedMessage = createValueExpression("#{messages['publicacao.action.excluir.mensagem']}");
setDeletedMessage(deletedMessage);
}
public void downloadArquivo() {
try {
byte[] conteudo = getInstance().getConteudo();
DocumentData data = new DocumentData(getInstance().getNome(), new DocumentData.DocumentType("pdf", "application/pdf"), conteudo);
String docId = documentStore.newId();
documentStore.saveData(docId, data);
String documentUrl = documentStore.preferredUrlForContent(data.getBaseName(), data.getDocumentType().getExtension(), docId);
facesContext.getExternalContext().redirect(manager.encodeConversationId(documentUrl, facesContext.getViewRoot().getViewId()));
} catch (IOException e) {
throw new RedirectException(e);
}
}
public boolean isEhAdministrador() {
return identity.isLoggedIn() && identity.hasRole("Administrador");
}
}
org.jboss.seam.InstantiationException: Could not instantiate Seam component: publicacaoHome
at org.jboss.seam.Component.newInstance(Component.java:2106)
at org.jboss.seam.Component.getInstance(Component.java:1988)
at org.jboss.seam.Component.getInstance(Component.java:1950)
at org.jboss.seam.Component.getInstance(Component.java:1944)
at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:55)
at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:50)
at org.jboss.seam.el.SeamELResolver.resolveBase(SeamELResolver.java:166)
at org.jboss.seam.el.SeamELResolver.getValue(SeamELResolver.java:53)
at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72)
at org.jboss.el.parser.AstIdentifier.getValue(AstIdentifier.java:44)
at org.jboss.el.parser.AstValue.getValue(AstValue.java:63)
at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71)
at javax.faces.component.UIComponentBase.isRendered(UIComponentBase.java:390)
at org.richfaces.component.DataIterator.nextColumn(DataIterator.java:27)
at org.richfaces.component.ColumnsIterator.next(ColumnsIterator.java:40)
at org.richfaces.component.ColumnsIterator.next(ColumnsIterator.java:14)
at org.ajax4jsf.component.UIDataAdaptor.saveChildState(UIDataAdaptor.java:892)
at org.ajax4jsf.component.UIDataAdaptor.setRowKey(UIDataAdaptor.java:345)
at org.richfaces.renderkit.AbstractTableRenderer.encodeTableStructure(AbstractTableRenderer.java:121)
at org.richfaces.renderkit.html.DataTableRenderer.doEncodeBegin(DataTableRenderer.java:206)
at org.richfaces.renderkit.html.DataTableRenderer.doEncodeBegin(DataTableRenderer.java:194)
at org.ajax4jsf.renderkit.RendererBase.encodeBegin(RendererBase.java:101)
at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:813)
at javax.faces.component.UIData.encodeBegin(UIData.java:962)
at org.ajax4jsf.component.UIDataAdaptor.encodeBegin(UIDataAdaptor.java:1220)
at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:280)
at org.ajax4jsf.renderkit.RendererBase.renderChildren(RendererBase.java:262)
at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:220)
at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:215)
at org.ajax4jsf.renderkit.RendererBase.encodeChildren(RendererBase.java:121)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:930)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:148)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:930)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:933)
at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:592)
at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108)
at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:196)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
at org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:177)
at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:267)
at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:380)
at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:507)
at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.HotDeployFilter.doFilter(HotDeployFilter.java:53)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:601)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
Caused by: org.jboss.seam.RequiredException: @In attribute requires non-null value: publicacaoHome.documentStore
at org.jboss.seam.Component.getValueToInject(Component.java:2297)
at org.jboss.seam.Component.injectAttributes(Component.java:1703)
at org.jboss.seam.Component.inject(Component.java:1521)
at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:61)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.ConversationInterceptor.aroundInvoke(ConversationInterceptor.java:56)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.transaction.TransactionInterceptor$1.work(TransactionInterceptor.java:95)
at org.jboss.seam.util.Work.workInTransaction(Work.java:47)
at org.jboss.seam.transaction.TransactionInterceptor.aroundInvoke(TransactionInterceptor.java:89)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:185)
at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:103)
at br.ufrj.cos.portalfees.session.publicacao.PublicacaoHome_$$_javassist_2.create(PublicacaoHome_$$_javassist_2.java)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.jboss.seam.util.Reflections.invoke(Reflections.java:22)
at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:144)
at org.jboss.seam.Component.callComponentMethod(Component.java:2211)
at org.jboss.seam.Component.callCreateMethod(Component.java:2134)
at org.jboss.seam.Component.newInstance(Component.java:2094)
... 87 more
Obrigado!