tomcat 后台 getOutputStream 浏览器子页面 文件下载求助

在做一个项目，要求导出数据到Excel,小弟想到了用getOutputStream后台向浏览器写数据流的方式。
数据的导出下载是实现了，但现在有两个页面，A和B,其中B是A通过window.showModelessDialog（）方式打开的子页面，在B中点击下载就报错，其他地方没问题，这是怎么回事啊！！用户催得紧，小弟刚接触jsp，谢谢各位大侠
ClientAbortException:  java.net.SocketException: Connection reset by peer: socket write error
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:388)
at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:371)
at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:413)
at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:401)
at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:91)
at jxl.write.biff.MemoryDataOutput.writeData(MemoryDataOutput.java:107)
at jxl.write.biff.CompoundFile.writeExcelData(CompoundFile.java:505)
at jxl.write.biff.CompoundFile.write(CompoundFile.java:455)
at jxl.write.biff.File.close(File.java:120)
at jxl.write.biff.WritableWorkbookImpl.close(WritableWorkbookImpl.java:456)
at com.mooo.mycoz.util.BackstageDownLoad.processDownload(BackstageDownLoad.java:93)
at org.apache.jsp.lookup.LookupPlan_jsp._jspService(LookupPlan_jsp.java:434)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.net.SocketException: Connection reset by peer: socket write error
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(Unknown Source)
at java.net.SocketOutputStream.write(Unknown Source)
at org.apache.coyote.http11.InternalOutputBuffer.realWriteBytes(InternalOutputBuffer.java:215)
at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:462)
at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:366)
at org.apache.coyote.http11.InternalOutputBuffer$OutputStreamOutputBuffer.doWrite(InternalOutputBuffer.java:240)
at org.apache.coyote.http11.filters.ChunkedOutputFilter.doWrite(ChunkedOutputFilter.java:119)
at org.apache.coyote.http11.AbstractOutputBuffer.doWrite(AbstractOutputBuffer.java:192)
at org.apache.coyote.Response.doWrite(Response.java:504)
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:383)
... 33 more