定义一个configuation,并将优先级调为最高。

package wang.aweb.childcar.config;

import org.springframework.web.filter.CorsFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;

@Configuration
public class GlobalCorsConfig {
    @Bean
    public FilterRegistrationBean corsFilter() {
        //1.添加CORS配置信息
        CorsConfiguration config = new CorsConfiguration();
        config.addAllowedOrigin("*");
        //2) 是否发送Cookie信息
        config.setAllowCredentials(true);
        //3) 允许的请求方式
        config.addAllowedMethod("OPTIONS");
        config.addAllowedMethod("HEAD");
        config.addAllowedMethod("GET");
        config.addAllowedMethod("PUT");
        config.addAllowedMethod("POST");
        config.addAllowedMethod("DELETE");
        config.addAllowedMethod("PATCH");
        config.setMaxAge(3600L);
        // 4）允许的头信息
        config.addAllowedHeader("*");

        //2.添加映射路径，我们拦截一切请求
        UrlBasedCorsConfigurationSource configSource = new UrlBasedCorsConfigurationSource();
        configSource.registerCorsConfiguration("/**", config);

        //3.返回新的CorsFilter.
        //return new CorsFilter(configSource);

        FilterRegistrationBean bean = new FilterRegistrationBean(new CorsFilter(configSource));
        bean.setOrder(0);
        return bean;
    }
}