java中的过滤器：Filter

/**
 * @author yinfeng
 * @description 跨域解决
 * @since 2021/10/1 17:53
 */
public class CrossFilter implements Filter {
    @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", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin," +
                " authority, content-type, version-info, X-Requested-With,token");
        response.setHeader("Content-Type", "application/json; charset=utf-8");
        response.setCharacterEncoding("utf-8");
        filterChain.doFilter(request, response);
    }
}