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package com.course.server.config;import org.springframework.context.annotation.Configuration;import org.springframework.web.cors.CorsConfiguration;import org.springframework.web.servlet.config.annotation.CorsRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configurationpublic class CorsConfig implements WebMvcConfigurer {
       @Override    public void addCorsMappings(CorsRegistry registry) {
           registry.addMapping("/**")                .allowedOriginPatterns("*")                .allowedHeaders(CorsConfiguration.ALL)                .allowedMethods(CorsConfiguration.ALL)                .allowCredentials(true)                .maxAge(3600); // 1小时内不需要再预检（发OPTIONS请求）    }}

这里老师用的是.allowedOrigins("*")

package com.course.gateway;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;import org.springframework.context.annotation.Bean;import org.springframework.core.env.Environment;import org.springframework.web.cors.CorsConfiguration;import org.springframework.web.cors.reactive.CorsWebFilter;import org.springframework.web.cors.reactive.UrlBasedCorsConfigurationSource;import org.springframework.web.util.pattern.PathPatternParser;@SpringBootApplication@EnableEurekaClientpublic class GatewayApplication {
       private static final Logger LOG = LoggerFactory.getLogger(GatewayApplication.class);    public static void main(String[] args) {
           SpringApplication app = new SpringApplication(GatewayApplication.class);        Environment env = app.run(args).getEnvironment();        LOG.info("启动成功！！");        LOG.info("Gateway地址: \thttp://127.0.0.1:{}", env.getProperty("server.port"));    }    /**     * 配置跨域     * @return     */    @Bean    public CorsWebFilter corsFilter() {
           CorsConfiguration config = new CorsConfiguration();        config.setAllowCredentials(Boolean.TRUE);        config.addAllowedMethod("*");        config.addAllowedOriginPattern("*");        config.addAllowedHeader("*");        config.setMaxAge(3600L);        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(new PathPatternParser());        source.registerCorsConfiguration("/**", config);        return new CorsWebFilter(source);    }}

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