springMvc跨域解决方案

jsonp 解决方案:

public MappingJacksonValue login(String callback,String user,String pwd,HttpServletRequest request,HttpServletResponse response,HttpSession session) {
System.out.println("222");
System.out.println("username:"+user+"password:"+pwd);


if("admin".equals(user)&&"123".equals(pwd)){
MappingJacksonValue mv=new MappingJacksonValue("ok");
mv.setJsonpFunction(callback);   //callback 是接应前台跨域请求的一个暗号
return mv;
}else {
MappingJacksonValue mv=new MappingJacksonValue("ko");
mv.setJsonpFunction(callback);
return mv;
}


}

https://blog.csdn.net/thc1987/article/details/54571305