跨域问题session不一致问题的解决（前端和后台在不同的服务器）

场景：首先调用发送短信接口，然后调用注册接口，结果后台的session不一致获取不到之前验证码。

实质：每次ajax跨域访问都是新的session ，每次的sessionID都不一样

解决：

package com.runmin.bajie.intercepter;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;

import org.springframework.web.servlet.ModelAndView;

/**

 * 跨域拦截器

 * @author ouyan

 *

 */

public class AccessInterceptor implements HandlerInterceptor {

    @Override

    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)

            throws Exception {

    }

    @Override

    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)

            throws Exception {

    }

    @Override

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        response.setContentType("textml;charset=UTF-8");

        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");

        response.setHeader("Access-Control-Max-Age", "0");

        response.setHeader("Access-Control-Allow-Headers", "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With,userId,token");

        response.setHeader("XDomainRequestAllowed","1");

        response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));

        response.setHeader("Access-Control-Allow-Credentials", "true");

        response.setHeader("Access-Control-Allow-Credential", "true");

        response.setHeader("P3P", "CP=CAO PSA OUR");

        if(request.getHeader("Access-Control-Request-Method")!=null&&"OPTIONS".equals(request.getMethod())) {

            response.addHeader("Access-Control-Allow-Methods", "POST,GET,TRACE,OPTIONS");

            response.addHeader("Access-Control-Allow-Headers", "Content-Type,Origin,Accept");

            response.addHeader("Access-Control-Max-age", "120");

        }

        return true;

    }

}

详细：

前端JS：

$.ajax({

        url: host+url,

        type: type,

        dataType: 'json',

        async: false,

        cache: false,

        xhrFields: {

            withCredentials: true

        },

        crossDomain: true,

        data: params,

        success: function(data) {

            //回调函数

            if (callbackFun) {

                callbackFun(data);

            }

        },

        error: function() {}

    })