技術標籤：E_BOOK書城javafilter

1、使用 Filter 過濾器攔截/pages/manager/所有內容，實 現許可權檢查

Filter 程式碼：

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
    HttpServletRequest httpServletRequest = (HttpServletRequest) request;

    User user =
 
 (User) httpServletRequest.getSession().getAttribute("user");

    if(user == null){
        httpServletRequest.getRequestDispatcher("/pages/user/login.jsp").forward(request,response);
    }else{
        chain.doFilter(request,response);
    }
}

web.xml 中的配置：

<!--    對管理進行過濾進行配置-->
 

    <filter>
        <filter-name>ManagerFilter</filter-name>
        <filter-class>loey.filter.ManagerFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>ManagerFilter</filter-name>
        <url-pattern>/pages/manager/*</
 
url-pattern>
        <url-pattern>/manager/bookServlet</url-pattern>
    </filter-mapping>

index.jsp；

<a id="filter" href="pages/manager/manager.jsp">後臺管理</a>
$("#filter").click(function () {
	if(${empty sessionScope.user}){
		alert("你還未登入無法進行後臺管理操作，請先登入~");
	}
});