@FeignClient(name = "capability-register", fallback = ApiServiceClientFallBack.class )
public interface ApiServiceClient {?
? ? @GetMapping("/apiDebug/")
? ? Result debug(@RequestParam("url") String path,
? ? ? ? ? ? ? ? ?@RequestParam("param") String param,
? ? ? ? ? ? ? ? ?@RequestParam("method") String method,
? ? ? ? ? ? ? ? ?@RequestParam("appKey") String appKey,
? ? ? ? ? ? ? ? ?@RequestHeader(name = "Token",required = true) String Token);
}

這里需要注意，其他幾個(gè)參數(shù)都是調(diào)用debug接口需要的參數(shù)，使用此接口時(shí)，直接獲取驗(yàn)證信息放進(jìn)token中，就可以了

2、這個(gè)方法是網(wǎng)上大多數(shù)人的用法

但是我看到一個(gè)大神的博客，說(shuō)是這種方法有點(diǎn)不好，然后大神自定義了一個(gè)Hystrix的策略，這個(gè)第三種方法再講

這種方法是對(duì)所有的feign調(diào)用統(tǒng)一設(shè)置請(qǐng)求頭

package com.hiynn.provider.configuration;?
import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;?
import javax.servlet.http.HttpServletRequest;
?
/**
?* @author lidai
?* @date 2019/2/27 16:14
?* <p>
?* Feign調(diào)用的時(shí)候添加請(qǐng)求頭Token
?*/
@Configuration
public class FeignConfiguration implements RequestInterceptor {
?
? ? @Override
? ? public void apply(RequestTemplate requestTemplate) {
? ? ? ? ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
? ? ? ? HttpServletRequest request = attributes.getRequest();
? ? ? ? requestTemplate.header("Token", request.getHeader("Token"));
? ? }
}

有了configuration之后還需要再feign添加configuration屬性

@FeignClient(name = "capability-register", fallback = ApiServiceClientFallBack.class ,configuration = FeignConfiguration.class)
public interface ApiServiceClient {
?
? ? @GetMapping("/apiDebug/")
? ? Result debug(@RequestParam("url") String path,
? ? ? ? ? ? ? ? ?@RequestParam("param") String param,
? ? ? ? ? ? ? ? ?@RequestParam("method") String method,
? ? ? ? ? ? ? ? ?@RequestParam("appKey") String appKey);
}

到這里的時(shí)候，如果你debug的話(huà)，會(huì)發(fā)現(xiàn)FeignConfiguration中的attributes獲取不到，需要再配置文件中添加如下配置就可以了

hystrix:
? command:
? ? default:
? ? ? execution:
? ? ? ? isolation:
? ? ? ? ? strategy: SEMAPHORE

3、第三種方法就是大神的方法了

和第二種方法的區(qū)別就是不需要添加配置文件，但是FeignConfiguration這個(gè)還是要的，不需要加配置文件就加一個(gè)自定義策略

package com.hiynn.provider.configuration;?
import com.netflix.hystrix.HystrixThreadPoolKey;
import com.netflix.hystrix.HystrixThreadPoolProperties;
import com.netflix.hystrix.strategy.HystrixPlugins;
import com.netflix.hystrix.strategy.concurrency.HystrixConcurrencyStrategy;
import com.netflix.hystrix.strategy.concurrency.HystrixRequestVariable;
import com.netflix.hystrix.strategy.concurrency.HystrixRequestVariableLifecycle;
import com.netflix.hystrix.strategy.eventnotifier.HystrixEventNotifier;
import com.netflix.hystrix.strategy.executionhook.HystrixCommandExecutionHook;
import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisher;
import com.netflix.hystrix.strategy.properties.HystrixPropertiesStrategy;
import com.netflix.hystrix.strategy.properties.HystrixProperty;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
?
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
?
/**
?* @author lidai
?* @date 2019/3/18 10:09
?*/
@Slf4j
@Configuration
public class FeignHystrixConcurrencyStrategy extends HystrixConcurrencyStrategy {
? ? private HystrixConcurrencyStrategy delegate;
?
? ? public FeignHystrixConcurrencyStrategy() {
? ? ? ? try {
? ? ? ? ? ? this.delegate = HystrixPlugins.getInstance().getConcurrencyStrategy();
? ? ? ? ? ? if (this.delegate instanceof FeignHystrixConcurrencyStrategy) {
? ? ? ? ? ? ? ? // Welcome to singleton hell...
? ? ? ? ? ? ? ? return;
? ? ? ? ? ? }
? ? ? ? ? ? HystrixCommandExecutionHook commandExecutionHook =
? ? ? ? ? ? ? ? ? ? HystrixPlugins.getInstance().getCommandExecutionHook();
? ? ? ? ? ? HystrixEventNotifier eventNotifier = HystrixPlugins.getInstance().getEventNotifier();
? ? ? ? ? ? HystrixMetricsPublisher metricsPublisher = HystrixPlugins.getInstance().getMetricsPublisher();
? ? ? ? ? ? HystrixPropertiesStrategy propertiesStrategy =
? ? ? ? ? ? ? ? ? ? HystrixPlugins.getInstance().getPropertiesStrategy();
? ? ? ? ? ? this.logCurrentStateOfHystrixPlugins(eventNotifier, metricsPublisher, propertiesStrategy);
? ? ? ? ? ? HystrixPlugins.reset();
? ? ? ? ? ? HystrixPlugins.getInstance().registerConcurrencyStrategy(this);
? ? ? ? ? ? HystrixPlugins.getInstance().registerCommandExecutionHook(commandExecutionHook);
? ? ? ? ? ? HystrixPlugins.getInstance().registerEventNotifier(eventNotifier);
? ? ? ? ? ? HystrixPlugins.getInstance().registerMetricsPublisher(metricsPublisher);
? ? ? ? ? ? HystrixPlugins.getInstance().registerPropertiesStrategy(propertiesStrategy);
? ? ? ? } catch (Exception e) {
? ? ? ? ? ? log.error("Failed to register Sleuth Hystrix Concurrency Strategy", e);
? ? ? ? }
? ? }
?
? ? private void logCurrentStateOfHystrixPlugins(HystrixEventNotifier eventNotifier,
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?HystrixMetricsPublisher metricsPublisher, HystrixPropertiesStrategy propertiesStrategy) {
? ? ? ? if (log.isDebugEnabled()) {
? ? ? ? ? ? log.debug("Current Hystrix plugins configuration is [" + "concurrencyStrategy ["
? ? ? ? ? ? ? ? ? ? + this.delegate + "]," + "eventNotifier [" + eventNotifier + "]," + "metricPublisher ["
? ? ? ? ? ? ? ? ? ? + metricsPublisher + "]," + "propertiesStrategy [" + propertiesStrategy + "]," + "]");
? ? ? ? ? ? log.debug("Registering Sleuth Hystrix Concurrency Strategy.");
? ? ? ? }
? ? }
?
? ? @Override
? ? public <T> Callable<T> wrapCallable(Callable<T> callable) {
? ? ? ? RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
? ? ? ? return new WrappedCallable<>(callable, requestAttributes);
? ? }
?
? ? @Override
? ? public ThreadPoolExecutor getThreadPool(HystrixThreadPoolKey threadPoolKey,
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? HystrixProperty<Integer> corePoolSize, HystrixProperty<Integer> maximumPoolSize,
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? HystrixProperty<Integer> keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue) {
? ? ? ? return this.delegate.getThreadPool(threadPoolKey, corePoolSize, maximumPoolSize, keepAliveTime,
? ? ? ? ? ? ? ? unit, workQueue);
? ? }
?
? ? @Override
? ? public ThreadPoolExecutor getThreadPool(HystrixThreadPoolKey threadPoolKey,
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? HystrixThreadPoolProperties threadPoolProperties) {
? ? ? ? return this.delegate.getThreadPool(threadPoolKey, threadPoolProperties);
? ? }
?
? ? @Override
? ? public BlockingQueue<Runnable> getBlockingQueue(int maxQueueSize) {
? ? ? ? return this.delegate.getBlockingQueue(maxQueueSize);
? ? }
?
? ? @Override
? ? public <T> HystrixRequestVariable<T> getRequestVariable(HystrixRequestVariableLifecycle<T> rv) {
? ? ? ? return this.delegate.getRequestVariable(rv);
? ? }
?
? ? static class WrappedCallable<T> implements Callable<T> {
? ? ? ? private final Callable<T> target;
? ? ? ? private final RequestAttributes requestAttributes;
?
? ? ? ? public WrappedCallable(Callable<T> target, RequestAttributes requestAttributes) {
? ? ? ? ? ? this.target = target;
? ? ? ? ? ? this.requestAttributes = requestAttributes;
? ? ? ? }
?
? ? ? ? @Override
? ? ? ? public T call() throws Exception {
? ? ? ? ? ? try {
? ? ? ? ? ? ? ? RequestContextHolder.setRequestAttributes(requestAttributes);
? ? ? ? ? ? ? ? return target.call();
? ? ? ? ? ? } finally {
? ? ? ? ? ? ? ? RequestContextHolder.resetRequestAttributes();
? ? ? ? ? ? }
? ? ? ? }
? ? }??
}

加上這個(gè)就可以了，親測(cè)三種方法均可行。

Feign中增加請(qǐng)求頭

最近遇到項(xiàng)目在調(diào)用

實(shí)現(xiàn)RequestInterceptor 接口，然后可以根據(jù)feignClient中的值加到請(qǐng)求頭中，使用時(shí)候在feignClient中配置，這樣就可以把參數(shù)傳入feign中

import com.alibaba.fastjson.JSONObject;
import com.google.common.collect.Lists;
import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.apache.commons.collections4.CollectionUtils;?
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
??
public class FeignConfiguration implements RequestInterceptor {??
? ? @Override
? ? public void apply(RequestTemplate template) {
?
? ? ? ? List<String> list = new ArrayList<>();
? ? ? ? if ("get".equalsIgnoreCase(template.method())){
? ? ? ? ? ? Map<String, Collection<String>> queries = template.queries();
? ? ? ? ? ? list = (List<String>) queries.get("key");
?
? ? ? ? } else if ("post".equalsIgnoreCase(template.method())){
? ? ? ? ? ? byte[] body = template.body();
? ? ? ? ? ? Map<String, Object> map = JSONObject.parseObject(body, Map.class);
? ? ? ? ? ? Object key = map.get("key");
? ? ? ? ? ? if (key != null){
? ? ? ? ? ? ? ? list.add(key.toString());
? ? ? ? ? ? }
? ? ? ? }
? ? ? ? if (CollectionUtils.isNotEmpty(list)) {
? ? ? ? ? ? template.header("head", list);
? ? ? ? }
? ? }?
}

import com.hbasesoft.vcc.sgp.integral.goods.config.FeignConfiguration;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;?
?
@FeignClient(name = "test", path = "/test", configuration = FeignConfiguration.class)
public interface ErpGoodsCouponsExternalClient {
?
? ? @GetMapping("/url")
? ? Object getData(@RequestParam("key") String key);? ??
}

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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