我的权限控制(JBX + struts + hibernate + ORACLE)

通过过滤器判定用户权限.
第一步:建立UserPermissionFilter类.
import Javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*; import test.system.SysUserApi;
import test.vo.SysUserVO;
import test.system.dao.SysUserDao;
import test.Const; public class UserPermissionFilter extends HttpServlet implements Filter { protected FilterConfig filterConfig = null; public void destroy() {
    this.filterConfig = null;
}
public void doFilter(
      ServletRequest request,
      ServletResponse response,
      FilterChain filterChain) throws IOException, ServletException {
    try {
      HttpServletRequest req = (HttpServletRequest) request;
      SysUserVO userSession = new SysUserVO();
      userSession = (SysUserVO)req.getSession().getAttribute(Const.SESSION_USER);
      if (userSession == null) {
        HttpServletResponse rep = (HttpServletResponse) response;         rep.sendRedirect("/admin/login.jsp");
             }else{
        filterChain.doFilter(request, response);
      }
    }
    catch (Exception e) {}
}
public void init(FilterConfig filterConfig) throws ServletException {
    this.filterConfig = filterConfig;
}
public FilterConfig getFilterConfig() {
    return filterConfig;
} public void setFilterConfig(FilterConfig filterConfig) {
    this.filterConfig = filterConfig;
} }

第二步:配置WEB.XML文件
设置过滤器:
<filter>
    <filter-name>userpermission</filter-name>
    <filter-class>sports.tools.UserPermissionFilter</filter-class>
</filter>
设置过滤器映射,因为过滤器不能过滤全部的程序,所以可以用列表的形式来增加需要过滤的文件.如下.一个过滤器可以过滤多个映射文件.
<filter-mapping>
    <filter-name>userpermission</filter-name>
    <url-pattern>/admin/index.jsp</url-pattern>
</filter-mapping>

<filter-mapping>
    <filter-name>userpermission</filter-name>
    <url-pattern>/admin/edit/*</url-pattern>

</filter-mapping>