Spring Could Eureka開啓驗證後無法連接註冊中心

Spring Could Eureka開啓驗證後無法連接註冊中心

Eureka的Server端和Client端本來已經聯通成功，服務註冊、發現都正常；
後來開啓了驗證功能，Client端向Server端註冊服務時，需要驗證用戶名和密碼，問題就出現了

com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server
	at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:112) ~[eureka-client-1.8.8.jar:1.8.8]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.8.8.jar:1.8.8]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) ~[eureka-client-1.8.8.jar:1.8.8]
	at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.8.8.jar:1.8.8]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.8.8.jar:1.8.8]
	at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:829) ~[eureka-client-1.8.8.jar:1.8.8]
	at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:121) [eureka-client-1.8.8.jar:1.8.8]
	at com.netflix.discovery.InstanceInfoReplicator$1.run(InstanceInfoReplicator.java:101) [eureka-client-1.8.8.jar:1.8.8]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_191]
	at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266) [na:1.8.0_191]
	at java.util.concurrent.FutureTask.run(FutureTask.java) [na:1.8.0_191]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_191]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_191]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_191]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_191]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_191]

出錯原因：
因新版（Spring Cloud 2.0 以上）的security默認啓用了csrf檢驗，要在eurekaServer端配置security的csrf檢驗爲false

代碼：

@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable();// 關閉csrf檢驗
        super.configure(http);
    }
}

解決方法：

1. 在 Eureka Server 項目中添加一個類，繼承WebSecurityConfigurerAdapter；
2. 在類上添加 @EnableWebSecurity 註解；
3. 覆蓋父類的 configure(HttpSecurity http) 方法，關閉掉 csrf，至此完美解決