文件上传与下载中“索引超出范围”的问题

做一个应用模块遇到了问题，请大家帮忙啊！应用结构：
 /myfile
   --/src
     --/simon
        --/BaseDao.java
        --/DelDao.java
        --/MyFile.java
        --/MyPathUtil.java
        --/UploadDao.java
   --/webroot
      --/css
      --/upload
      --/WEB-INF
        --/lib
         --/jspsmartupload.jar
         --/sqljdbc.jar
      --/delete.jsp
      --/doupload.jsp
      --/download.jsp
      --/index.jsp
      --/showal.jsp
运行产生异常：1.信息: Reloading context [/myfile]
feeffffffffffff
com.microsoft.sqlserver.jdbc.SQLServerException: 索引 1 超出范围。
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.setterGetParam(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.setString(Unknown Source)
at simon.BaseDao.executeSql(BaseDao.java:85)
at simon.DelDao.delFile(DelDao.java:40)
at org.apache.jsp.delete_jsp._jspService(delete_jsp.java:90)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:390)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:212)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:818)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:624)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
at java.lang.Thread.run(Thread.java:595)
执行增 删 改时发生错误！2.没有完成删除的功能！！