SSM拦截ajax请求判断session过期

最新推荐文章于 2021-08-05 12:20:18 发布

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最新推荐文章于 2021-08-05 12:20:18 发布

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分类专栏： java 文章标签： session过期登录拦截

本文链接：https://blog.youkuaiyun.com/github_38924695/article/details/89517372

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本文介绍如何在SSM框架中通过自定义过滤器实现Session过期检测与处理，包括配置filter拦截请求、判断Session状态并进行相应跳转，适用于前后端分离的项目。

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项目使用ssm作为后台框架，需要在后台判断session是否过期，并跳转登录页。
1.定义一个filter，拦截所有的请求。

package com.acat.filter;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * @Description：session过期拦截
 * @Author:yangfuren
 * @Date: Created in 13:31 2019-04-25
 * @Modified By:
 */
public class SessionTimeOutFilter implements Filter{


    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        HttpSession session = request.getSession();
        //请求全路径
        String requestUri = request.getRequestURI();
        //项目名
        String contextPath = request.getContextPath();
        //不拦截的url及资源
        String[] urls = {"/login.html","/loginin",".js",".css",".ico",".jpg",".png"};
        boolean flag = true;
        for (String str : urls) {
            if (requestUri.indexOf(str) != -1) {
                flag =false;
                break;
            }
        }
        if (!flag) {
            filterChain.doFilter(servletRequest, servletResponse);
            return;
        }

        Integer classId = (Integer) session.getAttribute("fenzuId");
        //如果用户不存在
        if (classId == null) {
            //获取ajax参数值
            String ajaxHeader = request.getHeader("X-Requested-With");
            //如果是ajax请求
            if("XMLHttpRequest".equals(ajaxHeader)) {
                response.setCharacterEncoding("utf-8");
                response.setContentType("application/json; charset=utf-8");
                PrintWriter out = response.getWriter();
                //json数据
                out.write("{\"status\":401,\"msg\":\"您的登录已过期\"}");
                out.flush();
                out.close();
            }else {
                response.sendRedirect(contextPath+"/login.html");
            }
        }else {
            filterChain.doFilter(servletRequest,servletResponse);
        }
    }

    @Override
    public void destroy() {

    }
}

2.在web.xml中配置filter

 <!--session过期 -->
    <filter>
        <filter-name>sessionFilter</filter-name>
        <filter-class>com.acat.filter.SessionTimeOutFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>sessionFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--设置session过期时间 单位 分钟-->
    <session-config>
        <session-timeout>180</session-timeout>
    </session-config>

3.在进行ajax返回时，根据状态码判断并跳转到login页面：

      $.ajax({
            url: url+"/itemType/saveItemType",//后台接收的url
            type: 'POST',
            data: dataJson,
            dataType: 'JSON',
            contentType: 'application/json;charset=UTF-8',
            async: false,
            success: function (result) {
                //登录过期，跳转到登录界面
                if(result.status == 401) {
                    alert("登录过期,请重新登录!")
                    window.location.href=url+"/login.html";
                    return
                }else {
                    alert("分类添加成功！");
                    location.reload();
                }
            }
        });