@WebFilter
@Component
public class CorsFilter implements Filter {
 @Override
 public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
  HttpServletRequest request = (HttpServletRequest) req;
  HttpServletResponse response = (HttpServletResponse) res;
  response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
  response.setHeader("Access-Control-Allow-Credentials", "true");
  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");
  System.out.println("**************************跨域过滤器被使用**************************");
  chain.doFilter(req, res);
 }
}