今天发布博客版本的时候出现了一个跨域的问题，少废话，上源码：

package xyz.haijin.weblog.config;

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;

@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("*");

        corsConfiguration.setAllowCredentials(true);
        //如果springboot的版本是高版本的，如：2.6.2，需要修改corsConfiguration.addAllowedOrigin("*")为：corsConfiguration.addAllowedOriginPattern("*");
        corsConfiguration.addAllowedOriginPattern("*");

        // 4 暴露哪些头部信息
//        corsConfiguration.addExposedHeader(JwtConstant.HEADER);
        return corsConfiguration;
    }

    //解决跨域
//    @Bean
//    public CorsWebFilter corsWebFilter() {
//        CorsConfiguration config = new CorsConfiguration();
//        config.addAllowedMethod("*");
//        config.addAllowedOrigin("*");
//        config.addAllowedHeader("*");
//        config.addAllowedOriginPattern("*");
//
//        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(new PathPatternParser());
//        source.registerCorsConfiguration("/**",config);
//
//        return new CorsWebFilter(source);
//    }

    @Bean
    public FilterRegistrationBean<CorsFilter> corsFilter() {
//        跨域配置CorsFilter不生效原因
//        项目中有多个Filter时，需要通过 @Order(Ordered.HIGHEST_PRECEDENCE) 注解设置过滤器的执行顺序
        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;
    }
}