参考：https://blog.csdn.net/crystalqy/article/details/79083857
参考：https://blog.csdn.net/lidai352710967/article/details/88680173
1、这是最简单的一个方法，但是需要对每个调用都一一添加，就是使用@RequestHeader注解添加参数到请求头中去
@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);
}这里需要注意，其他几个参数都是调用debug接口需要的参数，使用此接口时，直接获取验证信息放进token中，就可以了
2、这个方法是网上大多数人的用法，但是我看到一个大神的博客，说是这种方法有点不好，然后大神自定义了一个Hystrix的策略，这个第三种方法再讲
这种方法是对所有的feign调用统一设置请求头
import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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;
@Configuration
public class FeignConfiguration implements RequestInterceptor {
private static final Logger logger = LoggerFactory.getLogger(FeignConfiguration.class);
@Override
public void apply(RequestTemplate template) {
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
if(null != attributes) {
// 提取请求头中的Authorization，用于feign中添加请求头Authorization
HttpServletRequest request = attributes.getRequest();
String token = request.getHeader("Authorization");
template.header("Authorization", token);
// 注：由于feign调用的特殊性get
// 使用dto的，feign请求时会以application/json;charset=UTF-8方式请求。所以请求方法使用post
// 使用普通param得，feign请求时会以application/x-www-form-urlencoded;charset=UTF-8方式请求。所以请求方法使用get
}
logger.info("feign interceptor header:{}",template);
}
}有了configuration之后还需要再feign添加configuration属性
@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);
}注：configuration = FeignConfiguration.class 我试过这个我自己配置也是可以的。
到这里的时候，如果你debug的话，会发现FeignConfiguration中的attributes获取不到，需要再配置文件中添加如下配置就可以了
hystrix:
command:
default:
execution:
isolation:
strategy: SEMAPHORE3、第三种方法就是大神的方法了，和第二种方法的区别就是不需要添加配置文件，但是FeignConfiguration这个还是要的，不需要加配置文件就加一个自定义策略
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();
}
}
}
}
加上这个就可以了，亲测三种方法均可行。
