JAVA代码:
package com.cq.bean;import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;/**
* 登陆过滤器
* @author Administrator
*
*/
public class LoginFilter implements Filter{public void init(FilterConfig arg0) throws ServletException {
}public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest re=(HttpServletRequest)request;
HttpSession session=re.getSession();
if(session.getAttribute("loginuser")!=null){
chain.doFilter(request, response);
}else{
request.getRequestDispatcher("index.jsp").forward(request, response);
}
}public void destroy() {
}
}web.xml配置如下:
<filter>
<filter-name>LoginFilter</filter-name>
<filter-class>com.cq.bean.LoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>LoginFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping> 以上代码,登录页面也进不去了。因为在登录的时候loginuser为null,所以不行,解决办法是,可以在session中设置一个标志,如果是登陆页面就不判断 loginuser,请问这个应该怎么写?
package com.cq.bean;import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;/**
* 登陆过滤器
* @author Administrator
*
*/
public class LoginFilter implements Filter{public void init(FilterConfig arg0) throws ServletException {
}public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest re=(HttpServletRequest)request;
HttpSession session=re.getSession();
if(session.getAttribute("loginuser")!=null){
chain.doFilter(request, response);
}else{
request.getRequestDispatcher("index.jsp").forward(request, response);
}
}public void destroy() {
}
}web.xml配置如下:
<filter>
<filter-name>LoginFilter</filter-name>
<filter-class>com.cq.bean.LoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>LoginFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping> 以上代码,登录页面也进不去了。因为在登录的时候loginuser为null,所以不行,解决办法是,可以在session中设置一个标志,如果是登陆页面就不判断 loginuser,请问这个应该怎么写?
if(session.getAttribute("loginuser")!=null){
if(session.getAttribute("loginuser").equals("yes")){
chain.doFilter(request , response);
}else{
request.getRequestDispatcher("index.jsp").forward(request, response);
}
}else{
request.getRequestDispatcher("index.jsp").forward(request, response);
}
...
{
//通过
}else{
//过滤
}请求地址:HttpServletRequest.getRequestURL
更改成 url-pattern>/文件夹名称</url-pattern>
自然是所有的都不行了
登陆的最好不用Filter
其实就是一个登陆的类进行判断而已
你直接在代码中完成不是更好的嘛
这样就避开这个东西
而且能完成任务
这样不是更好么
FilterChain arg2) throws IOException, ServletException {
HttpServletRequest req=(HttpServletRequest)arg0;
HttpServletResponse res=(HttpServletResponse)arg1;
String path=req.getServletPath();
if (path.equals("/login.jsp")||path.equals("/user.do")) {
arg2.doFilter(arg0, arg1);
} else {
HttpSession session=req.getSession();
String islogin=(String)session.getAttribute("name");
if (islogin!=null&&islogin.equals("true")) {
arg2.doFilter(arg0, arg1);
} else {
arg0.getRequestDispatcher("login.jsp").forward(arg0, arg1);
}
} }
<filter>
<filter-name>islogin</filter-name>
<filter-class>com.inspur.IsLoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>islogin</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>islogin</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
URL已经有了,但是页面还是没有进去
if(null==session.getAttribute("ADMINUSER")&&!request.getRequestURI().endsWith("/index.jsp")
&& !request.getRequestURI().endsWith("/user.do")
{
response.sendRedirect(request.getContextPath()+"/manage/user/toLogin.action");
}
else{
arg2.doFilter(request, response);
}
1.只要在登录页面加上一个隐藏的标签并赋值,用request获取,再在Filter中判断就行了~
2.把其他页面用文件夹包装,改一下URL就行~