Attribute value request.getParameter("id")  is quoted with " which must be escaped when used within the value...

Google出来了解决办法:

“将value后面的"username”改为\"username\"

具体原由有可能是tomcat的版本不同导致的。jsp在编译jsp页面时,将 <%=request.getParameter("searchtype")%>作为变量进行处理。因此,遇到里面的"会报错。”