Spring Cloud微服务解决前端跨域问题

解决方案：增加 WebMvcConfig配置 

代码如下

import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.util.List;

import static org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type.SERVLET;


@Configuration
@ConditionalOnWebApplication(type = SERVLET)
public class WebMvcConfig implements WebMvcConfigurer {
	
	@Override
	public void addCorsMappings(CorsRegistry registry) {
		registry.addMapping("/**")
			.allowedOrigins("*")
			.allowCredentials(true)
			.allowedMethods("*")
			.allowedHeaders("*");
	}

第二种方法是直接在自己的服务模块的主启动类中配置 CorsFilter过滤器

import org.springframework.boot.SpringApplication;
import org.springframework.cloud.client.SpringCloudApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

import java.util.ArrayList;
import java.util.List;





private CorsConfiguration addcorsConfig() {
		CorsConfiguration corsConfiguration = new CorsConfiguration();
		List list = new ArrayList<>();
		list.add("*");
		corsConfiguration.setAllowedOrigins(list);
    /*
    // 请求常用的三种配置，*代表允许所有，当时你也可以自定义属性（比如header只能带什么，只能是post方式等等）
    */
		corsConfiguration.addAllowedOrigin("*");
		corsConfiguration.addAllowedHeader("*");
		corsConfiguration.addAllowedMethod("*");
		corsConfiguration.setAllowCredentials(true);
		return corsConfiguration;
	}
	@Bean
	public CorsFilter corsFilter() {
		UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
		source.registerCorsConfiguration("/**", addcorsConfig());
		return new CorsFilter(source);
	}