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  • Servlet中的过滤器

    在web.xml中配置:(用eclipse工具,可以在创建filter的时选择,web.xml中的配置可以自动生成)

    <filter>
    <display-name>LoginFilter</display-name>
    <filter-name>LoginFilter</filter-name>
    <filter-class>cn.web.filter.LoginFilter</filter-class>
    </filter>

    <filter-mapping>
    <filter-name>LoginFilter</filter-name>
    <url-pattern>/jsps/admin/*</url-pattern>  //过滤admin目录下的文件,
    </filter-mapping>

    <filter-mapping>
    <filter-name>LoginFilter</filter-name>
    <servlet-name>AdminManageServlet</servlet-name>
    </filter-mapping>
    <filter-mapping>
    <filter-name>LoginFilter</filter-name>
    <url-pattern>/jsps/AdminManage/*</url-pattern>
    </filter-mapping>

    2.Filter代码:

    public class LoginFilter implements Filter {
    public void destroy() {

    }

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

    HttpServletRequest req = (HttpServletRequest) request;
    Object user = req.getSession().getAttribute("sessionUser");
    if(user == null) {

    req.setAttribute("msg", "您还没有登录,不能访问本资源");
    req.getRequestDispatcher("/jsps/err.jsp").forward(req, response);
    } else {
    chain.doFilter(request, response);//放行
    }
    }

    public void init(FilterConfig fConfig) throws ServletException {

    }
    }

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  • 原文地址:https://www.cnblogs.com/qiyc/p/6986747.html
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