求struts 中用Filter实现每个页面的登录验证的代码--高分求解

Question

那有就web.xml里配置成对*过滤，然后在过滤器里作判断
不过要跳过图像文件等

Answer 1

首先写一个权限过滤filter
import javax.servlet.Filter;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.FilterChain;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;public class RightFilter
    implements Filter {
  public void init(FilterConfig filterConfig) throws ServletException {
  }  public void doFilter(ServletRequest request, ServletResponse response,
                       FilterChain chain) throws IOException, ServletException {
    HttpServletRequest req = (HttpServletRequest) request;
    HttpServletResponse res = (HttpServletResponse) response;
    
    HttpSession session = req.getSession(true);    //从session里取的用户名信息
    String username = (String) session.getAttribute("username");
    
    //判断如果没有取到用户信息,就跳转到登陆页面
    if (username == null || "".equals(username)) {
      //跳转到登陆页面
      res.sendRedirect("http://"+req.getHeader("Host")+"/login.jsp");
    }
    else {
      //已经登陆,继续此次请求
      chain.doFilter(request,response);
    }
  }  public void destroy() {
  }
}然后在web.xml里配置那些JSP文件需要登陆权限验证:1.如果是某个具体的JSP文件(如a.jsp)需要登陆验证
<web-app>
  ...
  <filter>
    <filter-name>right</filter-name>
    <filter-class>com.taihuatalk.taihua.common.common.RightFilter</filter-class>
  </filter>  <filter-mapping>
    <filter-name>right</filter-name>
    <url-pattern>/a.jsp</url-pattern>
  </filter-mapping>
  ...
</web-app>2.如果是某一个目录(如a/目录)整个目录下的文件都需要登陆验证:
<web-app>
  ...
  <filter>
    <filter-name>right</filter-name>
    <filter-class>com.taihuatalk.taihua.common.common.RightFilter</filter-class>
  </filter>  <filter-mapping>
    <filter-name>right</filter-name>
    <url-pattern>/a/*</url-pattern>
  </filter-mapping>
  ...
</web-app>

Answer 2

开两个贴...在下面的帖子里已经有回答了:
http://community.csdn.net/Expert/topic/5087/5087354.xml?temp=.3611566