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
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
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调用的时候添加请求头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);
}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: SEMAPHORE
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。
实现RequestInterceptor 接口，然后可以根据feignClient中的值加到请求头中，使用时候在feignClient中配置，这样就可以把参数传入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);
}以上为个人经验，希望能给大家一个参考，也希望大家多多支持。
