spring boot 处理跨域问题

不同版本会有不同的配置方式，这里只区分2.7和2.7之前

spring boot 2.7.0+

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.Collections;
 

@Configuration
public class CorsConfig {
    @Bean
    public CorsFilter corsFilter() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        //1,允许任何来源
        corsConfiguration.setAllowedOriginPatterns(Collections.singletonList("*"));
        //2,允许任何请求头
        corsConfiguration.addAllowedHeader(CorsConfiguration.ALL);
        //3,允许任何方法
        corsConfiguration.addAllowedMethod(CorsConfiguration.ALL);
        //4,允许凭证
        corsConfiguration.setAllowCredentials(true);
 
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", corsConfiguration);
        return new CorsFilter(source);
    }
}

spring boot 2.7之前

mport org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpMethod;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

@Configuration
public class CorsConfig {
    private static final long MAX_AGE = 3600L;
    
    @Bean
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig()); // 4 对接口配置跨域设置
        return new CorsFilter(source);
    }

    private static CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedOrigin("*"); // 1 设置访问源地址
        corsConfiguration.addAllowedHeader("*"); // 2 设置访问源请求头
        corsConfiguration.addAllowedMethod("*"); // 3 设置访问源请求方法
        corsConfiguration.setMaxAge(MAX_AGE);
        corsConfiguration.addAllowedMethod(HttpMethod.POST);
        corsConfiguration.addAllowedMethod(HttpMethod.GET);
        corsConfiguration.addAllowedMethod(HttpMethod.DELETE);
        corsConfiguration.addAllowedMethod(HttpMethod.PUT);
        corsConfiguration.addAllowedMethod(HttpMethod.OPTIONS);
        corsConfiguration.setAllowCredentials(true);//允许跨域传递身份认证
        return corsConfiguration;
    }