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

public class CorsFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) {
        // TODO Auto-generated method stub
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain chain) throws IOException, ServletException {
        if (request instanceof HttpServletRequest) {
            HttpServletResponse httpServletResponse = (HttpServletResponse) response;
            httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");
            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, Authorization");
        }
        chain.doFilter(request, response);
    }

    @Override
    public void destroy() {
        // TODO Auto-generated method stub
    }
}

    @Bean
    public FilterRegistrationBean corsFilterRegistration() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new CorsFilter());
        registration.addUrlPatterns("/*");
        registration.setName("corsFilter");
        //将其注册在其他过滤器的前面
        registration.setOrder(0);
        return registration;
    }