java 解决跨域的四种方式

1.后台Controller注解方式

@CrossOrigin("*")

2.实现WebMvcConfigurer接口

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("/**")
            .allowedOrigins("*")
            .allowCredentials(true)
            .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS")
            .maxAge(3600);
    }
}

3.配置CorsWebFilter实现跨域，适用于分布式网关

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.reactive.CorsWebFilter;
import org.springframework.web.cors.reactive.UrlBasedCorsConfigurationSource;

import java.util.Arrays;


@Configuration
public class GulimallCorsConfiguration{

    @Bean
    public CorsWebFilter corsWebFilter(){
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.setAllowedHeaders(Arrays.asList(new String("*")));
        corsConfiguration.setAllowedMethods(Arrays.asList(new String("*")));
        corsConfiguration.addAllowedOrigin("*");
        corsConfiguration.setAllowCredentials(true);

        source.registerCorsConfiguration("/**",corsConfiguration);
        return new CorsWebFilter(source);
    }
}

4.使用nginx配置反向代理，适用于开发测试

  server {
        listen       8500;
        server_name  127.0.0.1;

        
        location / {
            root   html;
            proxy_pass http://127.0.0.1:8555/test;
        }
  }