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          http://blog.csdn.net/ayace/archive/2005/05/14/374592.aspx
          

          LoginFilter.java:

          import javax.servlet.FilterChain;
          import javax.servlet.ServletRequest;
          import javax.servlet.ServletResponse;
          import java.io.IOException;
          import javax.servlet.Filter;
          import javax.servlet.http.HttpServletRequest;
          import javax.servlet.http.HttpServletResponse;
          import javax.servlet.ServletException;
          import javax.servlet.FilterConfig;


          /*
           * 
           * @author Ace
           * web.xml配置如下： 
           * <filter> 
           * <filter-name>login</filter-name>
           * <filter-class>
           * org.waityou.news.util.filters.LoginFilter
           * </filter-class>
           * </filter> 
           * <filter-mapping> 
           * <filter-name>login</filter-name>
           * <url-pattern>/manager/*</url-pattern> 
           * </filter-mapping>
                     */
          public class LoginFilter implements Filter {

                        protected FilterConfig filterConfig;

                        public void doFilter(final ServletRequest req, final ServletResponse res,
                      FilterChain chain)           throws IOException, ServletException {
                  HttpServletRequest hreq           = (HttpServletRequest) req;
                  HttpServletResponse hres           = (HttpServletResponse) res;
                  String isLog           = (String) hreq.getSession().getAttribute("isLog");
                            if ((isLog != null) && ((isLog.equals("true")) || (isLog == "true")))//檢查是否登錄
                  {
                      chain.doFilter(req, res);
                                return;
                  }           else
                      hres.sendRedirect(          "/error.html");//如果沒有登錄，把視圖派發到登錄頁面
              }

                        public void destroy() {
                            this.filterConfig = null;
              }

                        public void init(FilterConfig config) {
                            this.filterConfig = config;
              }

                        public void setFilterConfig(final FilterConfig filterConfig) {
                            this.filterConfig = filterConfig;
              }
          }




          SetCharacterEncodingFilter.java:

          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;

          /**
           *           @author Ace 編碼過濾，一律設置成UTF-8
           * 
           * web.xml中配置如下： 
           * <filter>
           * <filter-name>Set Character Encoding</filter-name>
           * <filter-class>
           * org.waityou.news.util.filters.SetCharacterEncodingFilter
           * </filter-class> 
           * </filter> 
           * <filter-mapping>
           * <filter-name>Set Character Encoding</filter-name> 
           * <url-pattern>/*</url-pattern>
           * </filter-mapping>
                     */
          public class SetCharacterEncodingFilter implements Filter {
              
                        public void destroy() {}
                        public void doFilter(ServletRequest request, ServletResponse response,
                      FilterChain chain)           throws IOException, ServletException {
                  request.setCharacterEncoding(          "UTF-8");
                            // 傳遞控制到下一個過濾器
                  chain.doFilter(request, response);
              }
              
                        public void init(FilterConfig filterConfig) throws ServletException {}

          }
          

	
          posted on 2007-07-31 17:38 守望者 閱讀(154) 評論(0)  編輯  收藏  
          

          







          
	    
    




          





          


          

	
          
		
          
				
		
	
		
          
		
		
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