java跨域配置CorsFilter不生效原因分析及解决

import com.nanase.takeshi.constants.JwtConstant;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

/**
 * CorsConfig
 * 跨域请求配置
 *
 * @author 725
 * @date 2020/12/10 18:17
 */
@Slf4j
@Configuration
public class CorsConfig {

    private CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        // 1 设置访问源地址
        corsConfiguration.addAllowedOrigin("*");
        // 2 设置访问源请求头
        corsConfiguration.addAllowedHeader("*");
        // 3 设置访问源请求方法
        corsConfiguration.addAllowedMethod("*");
        // 4 暴露哪些头部信息
        corsConfiguration.addExposedHeader(JwtConstant.HEADER);
        return corsConfiguration;
    }
    /**
	@Bean
    public CorsFilter corsFilter() {
        log.info("跨域设置。。。。");
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        // 对接口配置跨域设置
        source.registerCorsConfiguration("/**", buildConfig());
        return new CorsFilter(source);
    }
    */
    
    @Bean
    public FilterRegistrationBean<CorsFilter> corsFilter() {
        log.info("跨域设置。。。。");
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        // 5 对接口配置跨域设置
        source.registerCorsConfiguration("/**", buildConfig());
        //有多个filter时此处设置改CorsFilter的优先执行顺序
        FilterRegistrationBean<CorsFilter> bean = new FilterRegistrationBean<>(new CorsFilter(source));
        bean.setOrder(Ordered.HIGHEST_PRECEDENCE);
        return bean;
    }

}