JavaWEB网页登陆过滤

最新推荐文章于 2023-08-15 10:52:52 发布

Mr_Darry

最新推荐文章于 2023-08-15 10:52:52 发布

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分类专栏： Java JavaWEB 文章标签： java web filter

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本文介绍了一个简单的登录过滤器实现方式，用于防止未登录用户直接访问系统网页。通过拦截特定URL，检查用户会话状态来判断是否已登录。

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package filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import dataBean.UserBean;
//继承Filter接口
public class LoginFilter implements Filter {
/**
 * 描述：登录过滤，防止未登录直接访问系统网页
 * */
    public void destroy() {

    }

    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        HttpServletRequest servletRequest = (HttpServletRequest) request;
        HttpServletResponse servletResponse = (HttpServletResponse) response;
        HttpSession session = servletRequest.getSession();
        // 获取访问系统的URI
        String uri = servletRequest.getRequestURI().substring(
                servletRequest.getContextPath().length());
        //登录页无需过滤；
        if (uri.indexOf("/Login.jsp") > -1) {
            chain.doFilter(servletRequest, servletResponse);
            return;
        }
        // 从session里取员工用户信息
        String user = (String) session.getAttribute("user");
        if (user == null || "".equals(user)) {
            // 跳转到登陆页面
            servletResponse.sendRedirect("/TS7000test/Login.jsp");
        } else {
            // 已经登陆,继续此次请求
            chain.doFilter(request, response);
        }
    }

    public void init(FilterConfig arg0) throws ServletException {
        // TODO Auto-generated method stub

    }

}


web.xml文件中添加配置标签
<filter>
         <filter-name>Login</filter-name>
         <filter-class>filter.LoginFilter</filter-class>
</filter>

     <filter-mapping>
         <filter-name>Login</filter-name>
          <url-pattern>/ProductInfo.jsp</url-pattern>
          <url-pattern>/TestPage.jsp</url-pattern>
          <url-pattern>/User.jsp</url-pattern>
          <url-pattern>/Search.jsp</url-pattern>
          <url-pattern>/FindUser.jsp</url-pattern>
 </filter-mapping>