Openfeign header头传递及url重写

源代码

1、引入openfeign pom依赖

<dependency>
	<groupId>org.springframework.cloud</groupId>
	<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

2、添加配置对象

package xxx;

import com.alibaba.fastjson.JSON;
import com.netflix.hystrix.HystrixCommand;
import com.netflix.hystrix.HystrixCommandGroupKey;
import com.netflix.hystrix.HystrixCommandKey;
import com.netflix.hystrix.HystrixCommandProperties;
import feign.Feign;
import feign.RequestInterceptor;
import feign.Target;
import feign.hystrix.SetterFactory;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.openfeign.FeignClientProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.lang.reflect.Method;
import java.util.Enumeration;

public class FeignConfig extends FeignClientProperties.FeignClientConfiguration {

    private static final Logger logger = LoggerFactory.getLogger(FeignConfig.class);

    /**
     *  配置动态地址
     *  请求头参数透传
     * @return
     */
    @Bean
    public RequestInterceptor requestInterceptor() {
        return requestTemplate -> {
            ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
            HttpServletRequest request = attributes.getRequest();
            //替换路径中变量xxx为具体值
            String yunId = request.getHeader("xxx");
            requestTemplate.uri(requestTemplate.request().url().replace("//","/"+yunId+"/"));

            //透传请求header参数
            Enumeration<String> headerNames = request.getHeaderNames();
            if (headerNames != null) {
                while (headerNames.hasMoreElements()) {
                    String name = headerNames.nextElement();
                    String values = request.getHeader(name);
                    requestTemplate.header(name, values);
                }
            }

        };
    }

   /**
     *  hystrix 相关配置，feign默认集成
     * @return
     */
    @Bean
    public SetterFactory setterFactory(){
        SetterFactory setterFactory =new SetterFactory() {
            @Override
            public HystrixCommand.Setter create(Target<?> target, Method method) {

                String groupKey = target.name();
                String commandKey = Feign.configKey(target.type(), method);

                HystrixCommandProperties.Setter setter = HystrixCommandProperties.Setter()
//                        //设置统计指标60秒为一个时间窗口
//                        .withMetricsRollingStatisticalWindowInMilliseconds(1000 * 60)
//                        //超过80%失败率
//                        .withCircuitBreakerErrorThresholdPercentage(80)
//                        //操作5个开启短路器
//                        .withCircuitBreakerRequestVolumeThreshold(5)
                          //设置断路器的开启时间为60秒
//                        .withCircuitBreakerSleepWindowInMilliseconds(1000 * 60)
                          //设置信号量隔离
                          .withExecutionIsolationStrategy(HystrixCommandProperties.ExecutionIsolationStrategy.SEMAPHORE);

                return HystrixCommand.Setter
                        .withGroupKey(HystrixCommandGroupKey.Factory.asKey(groupKey))
                        .andCommandKey(HystrixCommandKey.Factory.asKey(commandKey))
                        .andCommandPropertiesDefaults(setter);
            }
        };
        return setterFactory;
    }

}