我已经使用自定义登录系统编写了一个应用程序。然后为其编写我自己的安全过滤器,该过滤器设置了可以访问的区域。但是我总是被重定向到登录页面,然后重定向到索引页面,登录页面是首页。我发现会话ID与登录后尝试使用受限制的东西时不同。这是我的代码:
public class securtityFilter implements Filter {
public void init(FilterConfig filterConfig) throws ServletException {
//To change body of implemented methods use File | Settings | File Templates.
}
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) servletRequest;
// if there is no userBean, then they have not gone through
// the login, so kick them to the login page
if(null==req.getSession().getAttribute("username"))
{
((HttpServletResponse)servletResponse).sendRedirect("../Login.jsp");
System.out.println("Redirected - No session");
}
// otherwise, let them go to the page/resource they want
filterChain.doFilter(servletRequest, servletResponse);
System.out.println("Gone through Filter");
// System.out.println("In Filter Servlet: "+ req.getSession().getId());
}
public void destroy() {
//To change body of implemented methods use File | Settings | File Templates.
}
}
这是我的web.xml文件:
<filter>
<filter-name>SecurityFilter</filter-name>
<filter-class>filters.securtityFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>SecurityFilter</filter-name>
<url-pattern>/add/*</url-pattern>
</filter-mapping>
最佳答案
在您的登录servlet中,您有
while (rs.next())
{
HttpSession session = request.getSession(true);
String tmp = rs.getString(1);
System.out.println(tmp);
session.setAttribute("username", tmp);
count++;
}
因此,如果您的会话中没有用户名属性,那是因为未执行此代码块。我假设您正在遍历数据库查询的结果,因此请检查您正在执行的实际查询是否返回任何结果。