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CorsConfig

package org.example.cors.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class CorsConfig implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry)
    {

        registry.addMapping("/**")//指定可以被跨域的路径
                .allowedHeaders("*")  //服务器允许的请求头
                .allowedMethods("POST", "PUT", "GET", "OPTIONS", "DELETE")  //服务器允许的请求方法
                .allowCredentials(true)  //允许带cookie的跨域请求 Access-Control-Allow-Credentials
                .allowedOrigins("*")  //服务端允许哪些域请求来源
                .maxAge(3600);   //预检请求的客户端缓存时间 单位秒，默认为1800秒
    }

}

CorsFilterConfig

package org.example.cors.config;

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;
import org.springframework.web.filter.CorsFilter;
import java.util.Arrays;

@Configuration
public class CorsFilterConfig
{

    @Bean
    public FilterRegistrationBean<CorsFilter> corsFilter()
    {

        FilterRegistrationBean<CorsFilter> corsFilterFilterRegistrationBean = new FilterRegistrationBean<>();
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        //服务器允许的请求头
        corsConfiguration.addAllowedHeader("*");
        //服务端允许哪些域请求来源
        corsConfiguration.addAllowedOrigin("*");
        //服务器允许的请求方法
        corsConfiguration.setAllowedMethods(Arrays.asList("POST", "PUT", "GET", "OPTIONS", "DELETE"));
        //允许带cookie的跨域请求 Access-Control-Allow-Credentials
        corsConfiguration.setAllowCredentials(true);
        //预检请求的客户端缓存时间 单位秒，默认为1800秒
        corsConfiguration.setMaxAge(3600L);
        //指定可以被跨域的路径
        source.registerCorsConfiguration("/**", corsConfiguration);
        //注册CorsFilter
        corsFilterFilterRegistrationBean.setFilter(new CorsFilter(source));
        //设置加载顺序为-1，该值越小优先级越高
        corsFilterFilterRegistrationBean.setOrder(-1);
        return corsFilterFilterRegistrationBean;
    }
}

@CrossOrigin

package org.example.cors.web;

import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class IndexController
{


    @CrossOrigin
    @RequestMapping("/index")
    public String index(){
        return "hello man";
    }

}