struts 2 如何拦截jsp页面

Question

用户登陆时候如何过滤jsp也面，只让他访问固定那个页面public class CharacterEncodingFilter extends HttpServlet implements Filter {
    private FilterConfig filterConfig;
    //Handle the passed-in FilterConfig
    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
    }    //Process the request/response pair
    public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain filterChain) {
        try {
          
             request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("utf-8");
            Operator operator = (Operator) request.getAttribute("user");
            HttpServletRequest hrequest = (HttpServletRequest)request;
            HttpServletResponse hresponse=(HttpServletResponse)response;
            if(operator==null){
             //request.getRequestDispatcher("/netSign/login.jsp").forward(hrequest,hresponse); 此方法不好使
             //hresponse.sendRedirect("/WEB-INF/administrator/login.jsp");此方法不好使            }else{
             filterChain.doFilter(hrequest, hresponse);
            }
            
        }  catch (Exception e) {
            filterConfig.getServletContext().log(e.getMessage());
        }
    }

Answer 1

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.HttpServletResponse;
import javax.servlet.http.HttpSession;public class StudentAuthorityFilter implements Filter {
/*
 * (non-Javadoc)
 * @see javax.servlet.Filter#destroy()
 */
public void destroy() {
}
/*
 * (non-Javadoc)
 * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
 */
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里取得用户名的身份
        String username = (String)session.getAttribute("username");
        //若没有取得用户信息或不符合角色权限则跳转到登陆界面
        if("".equals(username) || username == null){
         //跳转到登陆界面
            res.sendRedirect("/TSIMS/NoAuthority.jsp");         }else{
         if(!"10".equals(username.substring(0,2)))
          {
       res.sendRedirect("/TSIMS/NoAuthority.jsp");
        }else{
    //已经登陆,继续此次请求
           chain.doFilter(request,response);
      }   
        }  
}
/*
 * (non-Javadoc)
 * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
 */
public void init(FilterConfig config) throws ServletException {
}
}这是我以前做练习时写的一个过滤器，用来过滤登录权限的。。

Answer 2

String username = (String)session.getAttribute("username");无法获取参数

Answer 3

Struts 2 最著名的就是 Interceptor，你可以试试

Answer 4

这个就是一个Filter过滤器呀没什么呀！！！LZ去看看书或去查查过滤器相关资料吧

Answer 5

 public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain filterChain) {
        try {
            //request.setCharacterEncoding("GBK");
            //response.setCharacterEncoding("GBK");            request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("utf-8");
            
            HttpServletRequest hrequest = (HttpServletRequest)request;
            HttpServletResponse hresponse=(HttpServletResponse)response;
            Operator operator = (Operator)hrequest.getSession().getAttribute("user");
            String req_para=hrequest.getQueryString();
           // String userName=(String) hrequest.getSession().getAttribute("operator.name");
    //        String userName=(String) hrequest.getSession().getServletContext().getAttribute("")
      
           
           RequestDispatcher dispatcher = request.getRequestDispatcher("login.jsp");
           try{
            System.out.println(operator.getRealname()+"+++++++++++++++++++++++++++++");
            filterChain.doFilter(hrequest, hresponse);
           }
           catch (Exception e) {
          
            System.out.println("+++++++++++++++11++++++++++++++"); 
            dispatcher.forward(hrequest, hresponse);
}        }  catch (Exception iox) {
            filterConfig.getServletContext().log(iox.getMessage());
        }
    }web.xml 这样
<filter>
    <filter-name>characterencodingfilter</filter-name>
    <filter-class>com.zwhd.filter.CharacterEncodingFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>characterencodingfilter</filter-name>
    <url-pattern>/administrator/*</url-pattern>
  </filter-mapping>
  
调用的jsp放到administrator包外边
搞定