OPTIONS请求后台处理 跨域Filter 支持跨域

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import cn.hutool.http.Method; import org.springframework.web.filter.OncePerRequestFilter;   import javax.servlet.*; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException;   /**  * @author Administrator  */ public class CorsFilter extends OncePerRequestFilter {       @Override     protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {         httpServletResponse.setHeader("Access-Control-Allow-Origin", httpServletRequest.getHeader("Origin"));         httpServletResponse.addHeader("Access-Control-Allow-Credentials", "true");         httpServletResponse.setHeader("Access-Control-Allow-Methods",                 "POST, GET, OPTIONS, DELETE");         httpServletResponse.setHeader("Access-Control-Max-Age", "3600");         httpServletResponse.setHeader("Access-Control-Allow-Headers",                 "Content-Type, x-requested-with, X-Custom-Header, Request-Ajax");         if(httpServletRequest.getMethod().toUpperCase().equals(Method.OPTIONS.name())){             return;         }         filterChain.doFilter(httpServletRequest, httpServletResponse);     }     }

　　---跨域 JavaOPTIONS 情况的支持