UC知道大伙儿看看我这个过滤器写的有问题没！多谢！
来源：百度知道 编辑：UC知道 时间：2024/06/07 13:46:16
想实现的的是只有登陆了以后才能访问其他页面，否则返回登陆界面！
过滤器代码如下：
public void doFilter(ServletRequest arg0, ServletResponse arg1,
FilterChain arg2) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) arg0;
HttpServletResponse response = (HttpServletResponse) arg1;
HttpSession session = request.getSession(true);
String uriStr =request.getRequestURI();
System.out.println(">>>>>>>>>>>" + request.getRequestURI());
String uname=(String) session.getAttribute("name");
if (uname == null || "".equals(uname))
{
RequestDispatcher rd = arg0.getRequestDispatcher("/login.jsp");
rd.forward(arg0, arg1);
}
else {
arg2.doFilter(arg0, arg1);
}
}
xml配置文件如下：
<filter>
<filter-name>LoginFilter</filter-n
过滤器代码如下：
public void doFilter(ServletRequest arg0, ServletResponse arg1,
FilterChain arg2) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) arg0;
HttpServletResponse response = (HttpServletResponse) arg1;
HttpSession session = request.getSession(true);
String uriStr =request.getRequestURI();
System.out.println(">>>>>>>>>>>" + request.getRequestURI());
String uname=(String) session.getAttribute("name");
if (uname == null || "".equals(uname))
{
RequestDispatcher rd = arg0.getRequestDispatcher("/login.jsp");
rd.forward(arg0, arg1);
}
else {
arg2.doFilter(arg0, arg1);
}
}
xml配置文件如下：
<filter>
<filter-name>LoginFilter</filter-n
楼上说的对，你的登陆这个业务逻辑也被过滤了，这个 if后面再加一个判断
if (uname == null || "".equals(uname)) 《-----这句
{
RequestDispatcher rd = arg0.getRequestDispatcher("/login.jsp");
rd.forward(arg0, arg1);
}
改为
if (（uname == null || "".equals(uname)）&&(uriStr.indexOf("login.jsp") == -1 && uriStr.indexOf("login.do") == -1) <---如果你是struts这里就过滤login.do否则写上你执行登陆的servlet
{
RequestDispatcher rd = arg0.getRequestDispatcher("/login.jsp");
rd.forward(arg0, arg1);
}
你是不是从界面到servlet来往name的session里加值的 因为你从界面不是先到servlet而是先到过滤器 所以过滤器里面session还没有值 直接又给你干回登陆界面了