Java后台与VUE跨域交接

后台代码：
package com.cn.Mr.Zhong.filter;

import org.springframework.stereotype.Component;

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

//@Component
public class CorsFilter implements Filter {
   @Override
   public void init(FilterConfig filterConfig) throws ServletException {
   }
   @Override
   public void doFilter(ServletRequest requset, ServletResponse response, FilterChain chain) throws IOException, ServletException {
      HttpServletRequest req=(HttpServletRequest)requset;
      HttpServletResponse resp=(HttpServletResponse)response;
      String u=req.getParameter("username");
      String p=req.getParameter("password");
      String r=req.getParameter("randomcode");
      HttpSession session = req.getSession();
//    String validateCode = SessionUtil.getValidateCodeFromSession("validateCode");
//    String randomcode = req.getParameter("randomcode");
//    System.out.println(validateCode+"=="+randomcode);
      System.out.println("######################"+session.getId());
//          SessionUtil.setValToSession("validateCode", r);
      //session.setAttribute("validateCode",r);
//          Serializable id = SessionUtil.getSession().getId();
//          System.out.println("#######"+id);
//          SessionUtil.setValToSession("jsessionid",id);
//          resp.setHeader("Access-Control-Allow-Origin", "http://IP地址:8080");
//          resp.setHeader("Access-Control-Allow-Origin", "http://IP地址:3000");
      String origin = req.getHeader("Origin");
      System.out.println(origin);
      resp.setHeader("Access-Control-Allow-Origin", origin);
      resp.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, PUT");
      resp.setHeader("Access-Control-Max-Age", "3600");
      resp.setHeader("Access-Control-Allow-Headers", "x-requested-with,Authorization,Content-Type");
      resp.setHeader("Access-Control-Allow-Credentials", "true");
      if ("OPTIONS".equalsIgnoreCase(req.getMethod())){
         resp.setStatus(200);
         return;
      }
      chain.doFilter(requset, resp);
   }
   @Override
   public void destroy() {
   }
}

在web.xml中添加：

<!--CORS-->                                                

  <filter>                                                 
    <filter-name>corsFilter</filter-name>                  
    <filter-class>com.cn.Mr.Zhong.CorsFilter</filter-class>
  </filter>                                                
  <filter-mapping>                                         
    <filter-name>corsFilter</filter-name>                  
    <url-pattern>/*</url-pattern>                          
  </filter-mapping>                                        

然后等待前端发送请求，后台debug截数据，与前端商量数据格式！



此随笔还未编写完整！待续~~~