jsp中的引号问题

错误1： 

Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: /Test3.jsp(13,34) Attribute value request.getParameter("test") is quoted with " which must be escaped when used within the value

 

源码：<jsp:param name="t" value="<%=request.getParameter("test")%>"/>

是因为""中不能再套用"";

改后：<jsp:param name="t" value='<%=request.getParameter("test")%>'/>就OK了。

 

 

错误2：

 

Can not issue data manipulation statements with executeQuery().

String isCorrect = "select * from tb_user where username='+ username+' and password='+password+'";

 

这样的单引号'+username+'系统不识别；所以改为：

String isCorrect = "select * from tb_user where username='"+ username+"' and password='"+password+"'";

就对了。

 

 

今天出了不少错误。我们在失败中成长。谢谢。失败是成功的调味剂。谢谢失败。