java中接收邮件的附件无法下载的问题？？？

还有下载时报的错误信息：DataSou5744703[         SitControl.java:671:DEBUG] [[[cmd_show] Servlet Starting, doing setup- total:0.0,since last(Begin):0.0]]
[08-10-8 13:13:22:281 CST] 00000024 SystemOut     O 5744703[         SitControl.java:801:DEBUG] [[[cmd_show] Setup done, doing Event(s) and View(s)- total:0.0,since last([cmd_show] Servle...):0.0]]
[08-10-8 13:13:22:281 CST] 00000024 SystemOut     O 5744703[     RequestHandler.java:155:INFO ] [Processing Request]: cmd_show
[08-10-8 13:13:22:328 CST] 00000024 SystemOut     O 5744750[     RequestHandler.java:393:INFO ] servletName=sit, view=t_nf_message
[08-10-8 13:13:22:344 CST] 00000024 SystemOut     O :::::::::::::::[GenericEntity:Attachment][attachSize,4][messageUid,10242][description,null][attachType,text/plain][content,[B@7465d01e][filename,null][attachId,10231][contentType,context]
[08-10-8 13:13:27:062 CST] 00000024 SystemOut     O 5749484[         SitControl.java:671:DEBUG] [[[cmd_showpart] Servlet Starting, doing setup- total:0.0,since last(Begin):0.0]]
[08-10-8 13:13:27:062 CST] 00000024 SystemOut     O 5749484[         SitControl.java:801:DEBUG] [[[cmd_showpart] Setup done, doing Event(s) and View(s)- total:0.0,since last([cmd_showpart] Se...):0.0]]
[08-10-8 13:13:27:062 CST] 00000024 SystemOut     O 5749484[     RequestHandler.java:155:INFO ] [Processing Request]: cmd_showpart
[08-10-8 13:13:27:078 CST] 00000024 SystemOut     O 5749500[          MailEvent.java:397:INFO ] 
java.io.FileNotFoundException: e:\accessoryDirectory\webmail\10232\??????????·???????.doc (系统找不到指定的文件。)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:129)
at java.io.FileInputStream.<init>(FileInputStream.java:89)
at com.sailing.webmail.mail.MailEvent.do_showpart(MailEvent.java:382)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java(Compiled Code))
at java.lang.reflect.Method.invoke(Method.java(Compiled Code))
at com.sailing.core.event.JavaEventHandler.invoke(JavaEventHandler.java:81)
at com.sailing.core.event.JavaEventHandler.invoke(JavaEventHandler.java:67)
at com.sailing.core.control.RequestHandler.runEvent(RequestHandler.java:316)
at com.sailing.core.control.RequestHandler.doRequest(RequestHandler.java:195)
at com.sailing.control.servlet.SitControl.doGet(SitControl.java:809)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1284)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1241)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:136)
at filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:43)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:142)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:121)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:82)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:671)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:89)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:1924)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:89)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:472)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:411)
at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:101)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager.requestComplete(WorkQueueManager.java:566)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager.attemptIO(WorkQueueManager.java:619)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager.workerRun(WorkQueueManager.java:952)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worker.run(WorkQueueManager.java:1039)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java(Compiled Code))我是根据错误信息判断是附件名称的转码问题，但是转成GBK 或者GB2312也都不行。向高手请教!!在线等