ajax 跨域问题和跨域丢失seesion问题

项目中遇到跨域问题。所以记录下。

项目A （ajax方式）请求到项目B 。

一：需要在B中做些配置添加个过滤器
我的是SpringMVC的.

package net.pt365.cms.api.spring.security;

import org.springframework.stereotype.Component;

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


/**
 * CorsFileter 功能描述：CORS过滤器
 * @author 
 */
@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 {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        HttpServletRequest request=(HttpServletRequest)servletRequest;
        response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));//request.getHeader("Origin")
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "0");
        response.setHeader("P3P","CP=CAO PSA OUR");
        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("Access-Control-Allow-Credentials", "true");
        response.setHeader("XDomainRequestAllowed","1");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {

    }
}

这样的话就能实现跨域了。如果单单实现跨域，上面有些不必要的语句，不过写了不会错。。
只做这样的配置会导致 跨域后session丢失。也就是session不一致的问题。最后结果就是比如没登陆这种问题，
所以，还有ajax配置。

二：前台ajax写法

var transformurl ="http://127.0.0.1:231/app/document/transform.do"; //跨域请求
                    $.ajax({
                        url:transformurl,
                        data:{url:fileurl},
                        method:"post",xhrFields:{withCredentials: true},crossDomain: true,
                        success:function(res){  
                            //console.log();                    
                        }
                    });

xhrFields:{withCredentials: true},crossDomain: true,

 response.setHeader("P3P","CP=CAO PSA OUR");//这句是过滤器中的配置

对的起作用就是这2句。。解决了session不一致的问题。

好了。完美！

ajax 跨域问题和跨域丢失seesion问题

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