springcloud eureka
Caused by: java.lang.ArrayStoreException: sun.reflect.annotation.TypeNotPresentExceptionProxy
at sun.reflect.annotation.AnnotationParser.parseClassArray(AnnotationParser.java:724) ~[na:1.8.0_77]
at sun.reflect.annotation.AnnotationParser.parseArray(AnnotationParser.java:531) ~[na:1.8.0_77]
at sun.reflect.annotation.AnnotationParser.parseMemberValue(AnnotationParser.java:355) ~[na:1.8.0_77]
at sun.reflect.annotation.AnnotationParser.parseAnnotation2(AnnotationParser.java:286) ~[na:1.8.0_77]
at sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:120) ~[na:1.8.0_77]
at sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:72) ~[na:1.8.0_77]
at java.lang.class.createAnnotationData(Class.java:3521) ~[na:1.8.0_77]
at java.lang.class.annotationData(Class.java:3510) ~[na:1.8.0_77]
at java.lang.class.getDeclaredAnnotations(Class.java:3477) ~[na:1.8.0_77]
是导入错误的依赖，应该是
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
<version>2.2.2.RELEASE</version>
</dependency>
springcloud zookeeper
启动类中
@EnablediscoveryClient // 该注解用户向使用consul或者zookeeper作为注册中心注册服务
问题1
Caused by: org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.getWebServerFactory(ServletWebServerApplicationContext.java:203) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:179) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:153) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
... 13 common frames omitted
解决：看启动类中的名字是否无误
问题2
rg.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /services/payment8004/cccfa2da-c8d8-4b5c-bdb6-b8fbdfd7eb08
at org.apache.zookeeper.KeeperException.create(KeeperException.java:99) ~[zookeeper-3.5.3-beta.jar:3.5.3-beta-8ce24f9e675cbefffb8f21a47e06b42864475a60]
版本不一致，去除spring-cloud-starter-zookeeper-discovery的3.5.3-beta的jar，新增LATEST版本zookeeper
Caused by: java.lang.IllegalArgumentException: LoggerFactory is not a Logback LoggerContext but Logback is on the classpath. Either remove Logback or the competing implementation (class org.slf4j.impl.Log4jLoggerFactory loaded from file:/E:/apache-maven-3.5.4/repository/org/slf4j/slf4j-log4j12/1.7.29/slf4j-log4j12-1.7.29.jar). If you are using WebLogic you will need to add 'org.slf4j' to prefer-application-packages in WEB-INF/weblogic.xml: org.slf4j.impl.Log4jLoggerFactory
at org.springframework.util.Assert.instanceCheckFailed(Assert.java:696)
docker 下zookeeper的启动命令
docker run -p 8080:8080 --name zookeeper-standalone --restart always -d zookeeper
shell面板
docker exec -it c08a zkCli.sh
UnKNowHostException
@Configuration
public class ApplicationContextConfig {
@Bean
@LoadBalanced //赋予resttemple负载均衡的能力
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}
springcloud ribbon
消费者方
负载均衡算法
package com.example.myrule;
@Configuration
public class MySelfRule {
@Bean
public IRule myRule(){
return new Randomrule();
}
}
接口
public interface LoadBalancer {
ServiceInstance instances(List<ServiceInstance> serviceInstances);
}
实现类
@Component
public class MyLB implements LoadBalancer {
private AtomicInteger atomicInteger=new AtomicInteger(0);
public final int getAndIncrement(){
int current;
int next;
do {
current=this.atomicInteger.get();
next = current > Integer.MAX_VALUE ? 0 : current + 1;
}while (!this.atomicInteger.compareAndSet(current,next));
return next;
}
@Override
public ServiceInstance instances(List<ServiceInstance> serviceInstances) {
int index = getAndIncrement() % serviceInstances.size();
return serviceInstances.get(index);
}
}
CAS+自旋锁
config
@Configuration
public class ApplicationContextConfig {
@Bean
// @LoadBalanced //赋予resttemple负载均衡的能力
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}
controller
@RestController
public class OrderController {
//public static final String PAYMENT_URL = "http://localhost:8001";
public static final String PAYMENT_URL = "http://MicroServivceName";
@Resource
private RestTemplate restTemplate;
/**
* 自定义负载均衡算法
*/
@Resource
private LoadBalancer loadBalancer;
@Resource
private discoveryClient discoveryClient;
@GetMapping("/consumer/loadbalancer")
public String getPaymentLB() {
List<ServiceInstance> instances = discoveryClient.getInstances("SERVICE-NAME");
if (instances == null || instances.size() <= 0) {
return null;
}
ServiceInstance serviceInstance = loadBalancer.instances(instances);
URI uri = serviceInstance.getUri();
return restTemplate.getForObject(uri+"/payment/lb",String.class);
}
}
springcloud openfeign
服务调用
消费者微服务模块中service接口中加@FeignClient
service：
@FeithClient（value="MicroServiceName"）
public interface FeignService(){
@GetMapping("/name/{id}")
public Result getById(Integer id);
}
controller：
public class FeignController{
@Resource
private FeignService feignService;
@GetMapping("/get/{id}")
public Result order(@PathVariable Integer id ){
return feignService.getById(id);
}
}
openfeign超时控制
feign客户端默认等待一秒钟，超时就报错，
openFeign是由ribbon组成，修改ribbon的yml配置项即可
ribbon：
ReadTimeout：5000
ConnectTimeOut:5000
、
openfeign日志打印功能
BASIC：请求方法、url、、相应状态码、执行时间
HEADERS：请求方法、url、、相应状态码、执行时间，有请求和响应的头信息
FULL：请求方法、url、、相应状态码、执行时间，有请求和响应的头信息，还有请求和响应的正文和元数据
方法：
配置类
@configuration
public class feignConfig{
@Bean
Logger.level FeignLoggerLevel(){
return Logger.Level.Full;
}
}
YML
logger:
level:
#Feign日志是什么级别监控那个接口
com.springcloud.service.PaymentService：debug
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