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() {}
    })