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    if(flag==null)
     response.sendRedirect("login.jsp");
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    window.location.href="login.jsp?backurl="+window.location.href;
</script>
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<script language="javascript">
    alert("·µ»Ø");
    window.history.back ......

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дһ¸öjspÒ³Ãæ£¬·ÃÎÊʱÏÔʾ´ÓÏÂÃæµÄÒ³ÃæÌ ......

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rtexprvalueµÄÈ«³ÆÊÇ Run-time Expression Value£¬ ËüÓÃÓÚ±íʾÊÇ·ñ¿ÉÒÔʹÓÃJSP±í´ïʽ.
µ±ÔÚ<attribute>±êÇ©ÀïÖ¸¶¨<rtexprvalue>true</rtexprvalue>ʱ£¬ ±íʾ¸Ã×Ô¶¨Òå±êÇ©µÄijÊôÐÔµÄÖµ¿ÉÒÔÖ±½ÓÖ¸¶¨»òÕßͨ¹ý¶¯Ì¬¼ÆËãÖ¸¶¨, example as follow:
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