從天氣專案看Spring Cloud微服務治理 中遇到的問題和知識點總結
阿新 • • 發佈：2018-12-25
**maven有pom檔案，gradle有build.gradle
//quartz job 是controller這一層面。。不過不需要@RestController這個註解
幾個要用到的模板
包括redis httpclient 在spring中的模板（restTemplate，stringRedisTemplate）
要記住的幾個註解和相應的配置
@SpringBootApplication
這是程式的入口
@Configuration
@Bean
這是需要配置檔案所用到的註解
@RestController
@RequestMapping("/weather")
這是 controller層常用的註解
@Service
這是service層常用的註解
@XmlRootElement(name = "d")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlAttribute(name ="d1")
這是將xml檔案解析到javaBean
@SpringBootApplication
@EnableDiscoveryClient （eureka客戶端）
@SpringBootApplication
@EnableEurekaServer （eureka服務端）
這是將eureka所需的註解
@EnableFeignClients
@FeignClient("msa-weather-city-eureka")
spring.application.name: micro-weather-eureka-client-feign
eureka.client.serviceUrl.defaultZone: http://localhost:8761/eureka/
feign.client.config.feignName.connectTimeout: 5000
feign.client.config.feignName.readTimeout: 5000這是Feign所需的註解和application.properties配置
@EnableZuulProxy
spring.application.name: micro-weather-eureka-client-zuul eureka.client.serviceUrl.defaultZone: http://localhost:8761/eureka/ zuul.routes.hi.path: /hi/** zuul.routes.hi.serviceId: micro-weather-eureka-client
這是閘道器zuul所需的註解和application.properties配置
@SpringBootApplication
@EnableDiscoveryClient
@EnableConfigServer (客戶端不要這個註解即可）
spring.application.name: micro-weather-config-server
server.port= 8888
eureka.client.serviceUrl.defaultZone: http://localhost:8761/eureka/
spring.cloud.config.server.git.uri=https://github.com/MMaNong/spring-cloud-microservice-development
spring.cloud.config.server.git.searchPaths=config-repo這是spring cloud config所需的註解和application.properties配置
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
@EnableCircuitBreake
@HystrixCommand(fallbackMethod="default")
@GetMapping("/cities")
@HystrixCommand(fallbackMethod="deafultcities")
public String listCity() {
String body = cityClient.listCity();
return body;
}
public String deafultcities() {
return "City data server is down";
}也可以是@FeignClient(name="msa-weather-eureka-client-zuul" ,fallback=DataClientFallback.class)這是feign和hystrix的簡單寫法
這是熔斷 hystrix所需的註解和CityController的程式碼
通過jdk自帶的javax.xml.bind.JAXBContext來構建xmlbuilder將字串轉變為java物件程式碼如下
package com.wxa.spring.cloud.weather.util;
import java.io.Reader;
import java.io.StringReader;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
public class XmlBuilder {
public static Object xmlStrToOject(Class<?> clazz, String xmlStr) throws Exception {
Object xmlObject = null;
Reader reader = null;
JAXBContext context = JAXBContext.newInstance(clazz);
Unmarshaller unmarshaller = context.createUnmarshaller();
reader = new StringReader(xmlStr);
xmlObject = unmarshaller.unmarshal(reader);
if (null != reader) {
reader.close();
}
return xmlObject;
}
}
eureka中遇到的問題
Whitelabel Error Page
要刪除掉resources中的templates這個包和static這個資料夾 如果不刪除這兩個東西就會報
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Fri Jun 08 19:23:45 CST 2018There was an unexpected error (type=Not Found, status=404).No message available這種錯誤關於在cmd中啟動spring任務
利用gradle build 進行打包
在build和libs中找到打包好的jar包
利用如下命令進行執行還可以指定埠號 java -jar msa-weather-data-eureka-0.0.1-SNAPSHOT.jar --server.port=8083
如果不會cmd下怎麼進目錄，比如要直接進E:\臨時存視訊\46 從天氣專案看Spring Cloud微服務治理\msa-weather-data-eureka\build\libs 系統不會直接轉進去，要多打一個e:
C:\WINDOWS\system32>cd E:\臨時存視訊\46 從天氣專案看Spring Cloud微服務治理\msa-weather-data-eureka\build\libs
C:\WINDOWS\system32>e:
E:\臨時存視訊\46 從天氣專案看Spring Cloud微服務治理\msa-weather-data-eureka\build\libs>
在feign中遇到的問題
java.lang.IllegalStateException: Failed to introspect Class [org.springframework.cloud.openfeign.ribbon.FeignRibbonClientAutoConfiguration] from ClassLoader [[email protected]]
at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:659) ~[spring-core-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:556) ~[spring-core-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:541) ~[spring-core-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.util.ReflectionUtils.getUniqueDeclaredMethods(ReflectionUtils.java:599) ~[spring-core-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryMethod(AbstractAutowireCapableBeanFactory.java:728) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:670) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:638) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1507) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:421) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:391) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:97) ~[spring-context-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:693) ~[spring-context-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:531) ~[spring-context-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:122) ~[spring-boot-2.0.0.M3.jar:2.0.0.M3]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) [spring-boot-2.0.0.M3.jar:2.0.0.M3]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:386) [spring-boot-2.0.0.M3.jar:2.0.0.M3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.0.0.M3.jar:2.0.0.M3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1245) [spring-boot-2.0.0.M3.jar:2.0.0.M3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1233) [spring-boot-2.0.0.M3.jar:2.0.0.M3]
at com.wxa.spring.cloud.weather.Application.main(Application.java:14) [main/:na]
Caused by: java.lang.NoClassDefFoundError: org/springframework/cloud/client/loadbalancer/LoadBalancedRetryFactory
at java.lang.Class.getDeclaredMethods0(Native Method) ~[na:1.8.0_161]
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) ~[na:1.8.0_161]
at java.lang.Class.getDeclaredMethods(Class.java:1975) ~[na:1.8.0_161]
at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:641) ~[spring-core-5.0.0.RC3.jar:5.0.0.RC3]
... 19 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.springframework.cloud.client.loadbalancer.LoadBalancedRetryFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_161]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_161]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338) ~[na:1.8.0_161]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_161]
... 23 common frames omitted
2018-06-09 19:22:34.034 INFO 3420 --- [ main] ConfigServletWebServerApplicationContext : Closing org.springframework.boot.web.ser[email protected]49872d67: startup date [Sat Jun 09 19:22:32 CST 2018]; parent: org.spring[email protected]4c12331b
2018-06-09 19:22:34.036 WARN 3420 --- [ main] ConfigServletWebServerApplicationContext : Exception thrown from LifecycleProcessor on context close
java.lang.IllegalStateException: LifecycleProcessor not initialized - call 'refresh' before invoking lifecycle methods via the context: org.springframework.boot.web.ser[email protected]49872d67: startup date [Sat Jun 09 19:22:32 CST 2018]; parent: org.spring[email protected]4c12331b
at org.springframework.context.support.AbstractApplicationContext.getLifecycleProcessor(AbstractApplicationContext.java:433) [spring-context-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1004) [spring-context-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:963) [spring-context-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.boot.SpringApplication.handleRunFailure(SpringApplication.java:808) [spring-boot-2.0.0.M3.jar:2.0.0.M3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) [spring-boot-2.0.0.M3.jar:2.0.0.M3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1245) [spring-boot-2.0.0.M3.jar:2.0.0.M3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1233) [spring-boot-2.0.0.M3.jar:2.0.0.M3]
at com.wxa.spring.cloud.weather.Application.main(Application.java:14) [main/:na]
2018-06-09 19:22:34.037 ERROR 3420 --- [ main] o.s.b.f.s.DefaultListableBeanFactory : Destroy method on bean with name 'org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory' threw an exception
java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.web.ser[email protected]49872d67: startup date [Sat Jun 09 19:22:32 CST 2018]; parent: org.spring[email protected]4c12331b
at org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:420) [spring-context-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.context.support.ApplicationListenerDetector.postProcessBeforeDestruction(ApplicationListenerDetector.java:95) ~[spring-context-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:240) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:582) [spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:558) [spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:952) [spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:527) [spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.destroySingletons(FactoryBeanRegistrySupport.java:228) [spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:959) [spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1035) [spring-context-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1011) [spring-context-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:963) [spring-context-5.0.0.RC3.jar:5.0.0.RC3]
at org.springframework.boot.SpringApplication.handleRunFailure(SpringApplication.java:808) [spring-boot-2.0.0.M3.jar:2.0.0.M3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) [spring-boot-2.0.0.M3.jar:2.0.0.M3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1245) [spring-boot-2.0.0.M3.jar:2.0.0.M3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1233) [spring-boot-2.0.0.M3.jar:2.0.0.M3]
at com.wxa.spring.cloud.weather.Application.main(Application.java:14) [main/:na]
2018-06-09 19:22:34.039 WARN 3420 --- [ main] o.s.boot.SpringApplication : Unable to close ApplicationContext
springCloudVersion = 'Finchley.M2'改成 現在通用的版本 （springBootVersion = '2.0.1.RELEASE' springCloudVersion = 'Finchley.RC2'）的版本