filter过滤器（权限过滤）

/**
 * 用于检测用户是否登陆的过滤器，如果未登录，则重定向到指的登录页面redirectURL
 *  如果用户未登录，则重定向到指定的页面，URL不包括 ContextPath notCheckURLList
 * 不做检查的URL列表，以分号分开，并且 URL 中不包括 ContextPath
 */

public class RightFilter implements Filter {
 protected FilterConfig filterConfig = null;
 private String redirectURL = null;
 private Set<String> notCheckURLList = new HashSet<String>();

 @Override
 public void destroy() {
  // TODO Auto-generated method stub
  notCheckURLList.clear();
 }
 @SuppressWarnings({ "unchecked", "unchecked" })
 @Override
 public void doFilter(ServletRequest req, ServletResponse resp,
   FilterChain chain) throws IOException, ServletException {
  HttpServletResponse response = (HttpServletResponse) resp;
  HttpServletRequest request = (HttpServletRequest) req;
  HttpSession session = request.getSession();
  //
  if(checkRequestURIIntNotFilterList(request)){
   if(request.getRequestURI().endsWith("/platformindex.jsp") && session.getAttribute("user") == null){
    response.sendRedirect(request.getContextPath() + redirectURL);
       return;
   }
   chain.doFilter(req, resp);
   return;
  }else{
   if(session.getAttribute("user") == null){
    response.sendRedirect(request.getContextPath() + redirectURL);
       return;
   }else{
    String strCurrentPath =request.getContextPath() + request.getServletPath()
          + (request.getPathInfo() == null ? "" : request.getPathInfo());
    boolean isHaveRight = false;
    //询问访问的是否是用户菜单
    List<SysModule> userMenuist=(List<SysModule>) session.getAttribute("userMenu");
    if(userMenuist!=null && userMenuist.size()>0){
     for(SysModule tempModel  : userMenuist){
      if(tempModel.getModuleLocation().equals(strCurrentPath)){
       isHaveRight=true;
       break;
      }
     }
     if(isHaveRight){
      chain.doFilter(req, resp);
      return;
     }
    }
    //系统权限菜单
    List<SysRight> rightsList = (List<SysRight>) session.getAttribute("userRight");
    if(rightsList!=null && rightsList.size()>0){
     for(SysRight tempRight :rightsList){
      if(tempRight.getSysModule().getModuleLocation().equals(strCurrentPath)){
       isHaveRight=true;
       break;
      }
     }
     if(!isHaveRight){
      //无权限
      response.sendRedirect(request.getContextPath() + redirectURL);
         return;
     }else{
      chain.doFilter(req, resp);
      return;
     }
    }
   }
  }
 }
 @Override
 public void init(FilterConfig filterConfig) throws ServletException {
  // TODO Auto-generated method stub
  this.filterConfig = filterConfig;
     redirectURL = filterConfig.getInitParameter("redirectURL");
     String notCheckURLListStr = filterConfig.getInitParameter("notCheckURLList");
     if (notCheckURLListStr != null) {
         String[] params = notCheckURLListStr.split(",");
         for (int i = 0; i < params.length; i++) {
           if(params[i].trim().endsWith(".jsp")){
             notCheckURLList.add(params[i].trim());
          }else{
           makeNotCheckURLList(params[i].trim());
          }
         }
      }
 }
 private void makeNotCheckURLList(String strDirPath){
  String strFilePath = new RightFilter().getClass().getResource("/").getPath().replaceFirst("/", "").replaceAll("WEB-INF/classes/", "")+strDirPath;
  File notCheckfile = new File(strFilePath);
  File[] arrayFile = notCheckfile.listFiles();
  if(arrayFile==null){
   return;
  }
  for (int i = 0; i < arrayFile.length; i++) {
   if(arrayFile[i].isFile() && arrayFile[i].getName().endsWith(".jsp")){
    notCheckURLList.add(strDirPath+arrayFile[i].getName());
   }
  }
 }
 private boolean checkRequestURIIntNotFilterList(HttpServletRequest request) {
     String uri = request.getServletPath()
         + (request.getPathInfo() == null ? "" : request.getPathInfo());
     return notCheckURLList.contains(uri);
   }

}

----------

配置文件：

<filter>
    <filter-name>rightFilter</filter-name>
    <filter-class>cn.RightFilter</filter-class>
    <init-param>
      <param-name>redirectURL</param-name>
      <param-value>/page/login.jsp</param-value>   <!--   定位到login界面  -->
    </init-param>
    <init-param>
      <param-name>notCheckURLList</param-name><!--  不检查用户访问路径  -->
      <param-value>/page/</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>rightFilter</filter-name>
    <url-pattern>*.jsp</url-pattern>
  </filter-mapping>

public class CharacterEncodingFilter implements Filter {

    private String encoding = "UTF-8";

    public void init(FilterConfig filterConfig) throws ServletException {
        String encoding = filterConfig.getInitParameter("encoding");
        if (encoding != null) {
            this.encoding = encoding;
        }
    }
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {
        if (encoding != null) {
            servletRequest.setCharacterEncoding(this.encoding);
        }
        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void destroy() {
        encoding = null;
    }



}