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;

    }







}