1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | class FilterDispatcher implements Filter { private FilterConfig filterConfig; public void init(FilterConfig filterConfig) throws ServletException {} public void destroy() {} // 核心过滤方法 public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException { HttpServletRequest req = (HttpServletRequest) request; HttpServletResponse res = (HttpServletResponse) response; String uri = req.getRequestURI(); // 1 action 请求 // 可能的 uri 形式为 / 站点名 /resourceName/ 可选路径 /Product_input.action if (uri.endsWith(".action")) { int lastIndex = uri.lastIndexOf("/"); //1.1 处理 action 结尾的请求 String action = uri.substring(lastIndex + 1); if (action.equals("Product_input.action")) { //1.1.1 请求商品输入不做处理 } else if (action.equals("Product_save.action")) { Product product = new Product(); //1.1.2 保存商品信息 product.setProductName(request.getParameter("productName")); product.setDescription(request.getParameter("description")); product.setPrice(request.getParameter("price")); product.save(); request.setAttribute("product", product); } //1.2 转向视图 String dispatchUrl = null; if (action.equals("Product_input.action")) { dispatchUrl = "/jsp/ProductForm.jsp"; } else if (action.equals("Product_save.action")) { dispatchUrl = "/jsp/ProductDetails.jsp"; } if (dispatchUrl != null) { RequestDispatcher rd = request .getRequestDispatcher(dispatchUrl); rd.forward(request, response); } } else if (uri.indexOf("/css/") != -1 && req.getHeader("referer") == null) { //2 拒绝对样式表的直接访问 res.sendError(HttpServletResponse.SC_FORBIDDEN); } else { //3 请求其他资源,通过过滤器 filterChain.doFilter(request, response); } } } |
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