filter 登陆验证 java ee

心已赠人 2022-10-05 06:49 189阅读 0赞

在登入验证的servlet中  
如果用户输入正确的账号密码，就跳转 ，并且把用户名以"userName"放进session

request.getSession().setAttribute("userName", name);

通过filter实现登录验证

package filter;
     
    import java.io.IOException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
     
    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;
     
    public class AuthFilter implements Filter { 
     
        @Override
        public void destroy() { 
     
        }
     
        @Override
        public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
                throws IOException, ServletException { 
            HttpServletRequest request = (HttpServletRequest) req;
            HttpServletResponse response = (HttpServletResponse) res;
     
            String uri = request.getRequestURI();//获取uri
            
            if (uri.endsWith("login.html")) { 
                chain.doFilter(request, response);
                return;
            }
             //首先判断是否是访问的login.html
             //因为这两个页面就是在还没有登陆之前就需要访问的
             
            String userName = (String) request.getSession().getAttribute("userName");
            if (null == userName) { 
                response.sendRedirect("login.html");
                return;
            }
            //从Session中获取userName，如果没有，就表示不曾登陆过，跳转到登陆页面。
            chain.doFilter(request, response);
        }
     
        @Override
        public void init(FilterConfig arg0) throws ServletException { 
     
        }
     
    }