在做一个前后分离项目时，发现登录成功后已经把信息保存到session中了，再从session中获取当前用户信息的时候发现取不到，debug发现sessionId已经发生改变，最近在网站查找很多，但是并没有解决什么问题所以

把自己的解决的方式分享给大家：

**

后端拦截器：

**

//拦截器添加跨域支持(如果使用web.xml配置拦截器，请将@component删除)

//@Component

public class CORSFilter 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;

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

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

response.setHeader("Access-Control-Max-Age", "3600");

response.setHeader("Access-Control-Allow-Headers", "x-requested-with");

response.setHeader("Access-Control-Allow-Credentials","true"); //是否支持cookie跨域

filterChain.doFilter(servletRequest, servletResponse);

}

@Override

public void destroy() {

}

}

关键点：

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

response.setHeader(“Access-Control-Allow-Credentials”,“true”); //是否支持cookie跨域

前段代码：

request: function(param) {

var _this = this;

$.ajax({

xhrFields: {

withCredentials: true

},

type: param.method || ‘get’,

url: param.url || ‘’,

dataType: param.type || ‘json’,

data: param.data || ‘’,

success: function(res) {

console.log(“网络请求结果：”+res.toString());

//请求成功

},

error: function(err) {

typeof param.error === 'function' && param.error(err.statusText);

}

});

},

关键点：

在ajax请求中增加

xhrFields: {

withCredentials: true

},

经过上面的配置，完美的解决了我的问题！如果有疑问可以给我留言。