关于springboot2.4跨域配置问题

 1、如果只是一个简单的springboot demo，用以下配置就行
新建config类

```
import org.springframework.context.annotation.configuration;
import org.springframework.web.servlet.config.annotation.corsregistry;
import org.springframework.web.servlet.config.annotation.webmvcconfigurer;
 
/**
 * @author yk
 * @date 2021/7/19 14:36
 */
@configuration
public class webconfig implements webmvcconfigurer {
    @override
    public void addcorsmappings(corsregistry registry) {
        registry.addmapping("/**")
                .allowedoriginpatterns("*")
                .allowedmethods("*")
                .maxage(3600)
                .allowcredentials(true);
    }
}

```

2、但是实际开发中我们需要结合，spring-security、oauth2等等，就会发现上面的配置失效了，那是因为前面的filter优先级太高了，那我们可以采取如下配置

```

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;
 
/**
 * @author yk
 * @date 2021/7/19 16:21
 */
@configuration
public class crosconfig {
 
    @bean
    public filterregistrationbean corsfilter() {
        corsconfiguration config = new corsconfiguration();
        config.setallowcredentials(true);
        config.addallowedoriginpattern("*");
        config.addallowedheader("*");
        config.addallowedmethod("*");
        urlbasedcorsconfigurationsource source = new urlbasedcorsconfigurationsource();
        source.registercorsconfiguration("/**", config);
        filterregistrationbean bean = new filterregistrationbean(new corsfilter(source));
        //这里设置优先级最高
        bean.setorder(ordered.highest_precedence);
        return bean;
    }
}

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