JBoss Seam从头学到脚之11-eclipse中，itext事例的实现及理解

JBoss Seam从头学到脚之11---eclipse中，itext例子的实现及理解

继续学习seam中自带的例子，今天学习的是itext，是一个关于处理pdf文件的例子。

“todo”的部分日后在慢慢研究，呵呵。

 

步骤如下

1. 创建一个“itext”的seam web project。
2. 拷贝~~\examples\itext\src\org\jboss\seam\example\pdf下的java文件，到自己的工程中，并修正java错误。
3. 拷贝~~\examples\itext\view下的所有文件到自己工程的“webContent”下。
4. 拷贝examples\itext\resources\WEB-INF下的4个xml文件到，自己的“WEB-INF”下面，覆盖掉同名文件。
5. 从seam的路径中的lib目录下，拷贝itext.jar,jboss-seam-ui.jar，jboss-seam-pdf.jar，itext-rtf.jar，jfreechart.jar，jcommon.jar，到jboss路径下的common\lib下面。

未理解点：

1. pdf.keystore文件的作用及位置？
   //todo
2. form.xhtml文件，如果不改动会有下面的错误
   

   java.lang.NullPointerException
   	at com.lowagie.text.pdf.RandomAccessFileOrArray.InputStreamToArray(Unknown Source)
   	at com.lowagie.text.pdf.RandomAccessFileOrArray.<init>(Unknown Source)
   	at com.lowagie.text.pdf.PdfReader.<init>(Unknown Source)
   	at com.lowagie.text.pdf.PdfReader.<init>(Unknown Source)
   	at org.jboss.seam.pdf.ui.UIForm.encodeBegin(UIForm.java:51)
   	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:928)
   	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.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(Unknown Source)
   

    
   如果把
   URL="form.pdf"
   改成
   URL=http://localhost:8080/itext/form.pdf
   报出的错误变成。
   

   java.io.IOException: PDF header signature not found.
   	at com.lowagie.text.pdf.PRTokeniser.checkPdfHeader(Unknown Source)
   	at com.lowagie.text.pdf.PdfReader.readPdf(Unknown Source)
   	at com.lowagie.text.pdf.PdfReader.<init>(Unknown Source)
   	at com.lowagie.text.pdf.PdfReader.<init>(Unknown Source)
   	at org.jboss.seam.pdf.ui.UIForm.encodeBegin(UIForm.java:54)
   	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:928)
   	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.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(Unknown Source)