跨域說明和規(guī)則

正常情況下，跨域是這樣的： 
1. 微服務配置跨域+zuul不配置=有跨域問題 
2. 微服務配置+zuul配置=有跨域問題 
3. 微服務不配置+zuul不配置=有跨域問題 
4. 微服務不配置+zuul配置=ok

(方法一)在zull網(wǎng)關服務中統(tǒng)一處理跨域問題,但下面所有controller中去掉跨域注解--->加入Bean

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
import org.springframework.context.annotation.Bean;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

@Bean
    public CorsFilter corsFilter() {
        final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        final CorsConfiguration config = new CorsConfiguration();
        // 允許cookies跨域
        config.setAllowCredentials(true);
        // 允許向該服務器提交請求的URI，*表示全部允許。。這里盡量限制來源域，比如http://xxxx:8080 ,以降低安全風險.
        config.addAllowedOrigin("*");
        // 允許訪問的頭信息,*表示全部
        config.addAllowedHeader("*");
        // 預檢請求的緩存時間（秒），即在這個時間段里，對于相同的跨域請求不會再預檢了
        config.setMaxAge(18000L);
        // 允許提交請求的方法，*表示全部允許，也可以單獨設置GET、PUT等
        config.addAllowedMethod("*");
        config.addAllowedMethod("HEAD");
        // 允許Get的請求方法
        config.addAllowedMethod("GET");
        config.addAllowedMethod("PUT");
        config.addAllowedMethod("POST");
        config.addAllowedMethod("DELETE");
        config.addAllowedMethod("PATCH");
        source.registerCorsConfiguration("/**", config);
        return new CorsFilter(source);
    }

(方法二)統(tǒng)一處理跨域問題--->配置類

package com.zymotor.eutech.gateway.config;

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;

@Configuration
public class GlobalCorsConfiguration {

    @Bean
    public CorsFilter corsFilter() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.setAllowCredentials(true);
        corsConfiguration.addAllowedOrigin("*");
        corsConfiguration.addAllowedHeader("*");
        corsConfiguration.addAllowedMethod("*");
//        corsConfiguration.addExposedHeader("head1");
        //corsConfiguration.addExposedHeader("Location");
        UrlBasedCorsConfigurationSource urlBasedCorsConfigurationSource = new UrlBasedCorsConfigurationSource();
        urlBasedCorsConfigurationSource.registerCorsConfiguration("/**", corsConfiguration);
        return new CorsFilter(urlBasedCorsConfigurationSource);
    }
}