简单配置过滤器

来源：互联网发布：js中alert的用法编辑：程序博客网时间：2024/06/06 06:38

@Overridepublic void doFilter(ServletRequest request, ServletResponse response,FilterChain filterChain) throws IOException, ServletException {// 过滤用户请求，判断是否登录HttpServletRequest httpServletRequest = (HttpServletRequest)request;HttpServletResponse httpServletResponse = (HttpServletResponse)response;httpServletRequest.setCharacterEncoding("utf-8");httpServletResponse.setCharacterEncoding("utf-8");String username = (String)httpServletRequest.getSession().getAttribute("username");if (username == null) {String path = httpServletRequest.getContextPath();httpServletResponse.sendRedirect(path+"/index.jsp");}filterChain.doFilter(httpServletRequest, httpServletResponse);}

  <!-- 配置 过滤器 -->  <filter>  <filter-name>MyFilter</filter-name>  <filter-class>com.filter.MyFilter</filter-class>  </filter>  <filter-mapping>  <filter-name>MyFilter</filter-name>  <!-- /*表示过滤所有页面 ，/main.jsp 表示只过滤main.jsp页面-->  <url-pattern> /main.jsp</url-pattern>     </filter-mapping>   <filter-mapping>  <filter-name>MyFilter</filter-name>  <!-- /*表示过滤所有页面 /addProduct.jsp 表示只过滤addProduct.jsp页面-->  <url-pattern>/addProduct.jsp</url-pattern>     </filter-mapping>

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