<%
String name=request.getParameter("name");
String pass=request.getParameter("pass");if(name.equals("na"))
{
session.setAttribute("name",name);
session.setAttribute("pass",pass);
response.sendRedirect("loginsuccess.jsp");
}
%>这是我jsp的一段代码,但运行报错
org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
如果将if(name=="na") 则运行正常,但这方法不能判断字符串相等,请指点,谢谢。
String name=request.getParameter("name");
String pass=request.getParameter("pass");if(name.equals("na"))
{
session.setAttribute("name",name);
session.setAttribute("pass",pass);
response.sendRedirect("loginsuccess.jsp");
}
%>这是我jsp的一段代码,但运行报错
org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
如果将if(name=="na") 则运行正常,但这方法不能判断字符串相等,请指点,谢谢。
if(null != name && name.equals("na")) ...
public String deNull(String s)
{
return s==null?"":s.trim();
}
%>
<%
String name=deNull(request.getParameter("name"));
String pass=deNull(request.getParameter("pass"));
if(name.equals("na"))
{
session.setAttribute("name",name);
session.setAttribute("pass",pass);
response.sendRedirect("loginsuccess.jsp");
}
%>
如果 并没有这个 "name"
则request取过来的是null