攔截器 Filter ： js、css、jpg、png等靜態資源不被攔截解決方案

方案一：

web.xml配置文件攔截範圍縮小 ，沒有必要 /*的配置攔截項目下全部資源。

<filter>
        <filter-name>Login</filter-name>
        <filter-class>com.ssm.crm.filter.LoginFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>Login</filter-name>
        <url-pattern>/*</url-pattern> </filter-mapping>

修改以下：

<filter>
        <filter-name>Login</filter-name>
        <filter-class>com.ssm.crm.filter.LoginFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>Login</filter-name>
        <url-pattern>*.action</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>Login</filter-name>
        <url-pattern>*.do</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>Login</filter-name>
        <url-pattern>*.jsp</url-pattern>
    </filter-mapping>

進一步優化 ：把全部的頁面無需攔截的文件（jsp，html，ftl，css等放在同一個文件夾下；須要攔截的請求公有路徑也統一）攔截是配置爲：

<filter-mapping>
        <filter-name>Login</filter-name>
        <url-pattern>/文件夾名字/*</url-pattern> </filter-mapping> <filter-mapping> <filter-name>Login</filter-name> <url-pattern>/須要攔截的請求公有路徑/*</url-pattern> </filter-mapping>

方案二：

過濾掉js，css等相關文件

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest req = (HttpServletRequest)request; HttpServletResponse res = (HttpServletResponse)response; HttpSession session = req.getSession(); LoginUser loginUser = (LoginUser) session.getAttribute("loginUser"); String spath = req.getServletPath(); System.out.println("request.getContextPath()"+req.getContextPath()); //不須要過濾的url
        String[] urls = {"/login","/json",".js",".css",".ico",".jpg",".png"}; boolean flag = true; for (String str : urls) { if (spath.indexOf(str) != -1) { flag =false; break; } } if (flag) { if (loginUser != null) { chain.doFilter(request, response); }else { res.sendRedirect(req.getContextPath()+"/webpage/page/login/login.jsp"); } }else{ chain.doFilter(request, response); } }