springcloud 学习碰到的问题整合（1-8） - Go语言中文社区

springcloud 学习碰到的问题整合（1-8）

springcloud教程：http://blog.csdn.net/forezp/article/details/70148833


一路按教程做下来，碰到以下的问题：

1.在feign中使用熔断器hystrix，但是一直不起作用。因为在D版本的Spring Cloud中，它没有默认打开。

解决：在yml文件中加入

feign:
  hystrix:
    enabled: true
注意yml中不识别tab的空格。

做完以上工作，重启服务即可。


2.feign  hystrix dashboard 断路器  仪表盘无法打开

解决：a.pom添加一下依赖

	<!-- 断路器 hystrix -->
        <dependency>
		<groupId>org.springframework.cloud</groupId>
		<artifactId>spring-cloud-starter-hystrix</artifactId>
	</dependency>
	<!-- hystrix dashboard 断路器  仪表盘 -->
	<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
        </dependency>
        
	<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
b.启动类添加一下注释

@EnableHystrix@EnableHystrixDashboard

3.zuul 

maven中直接添加zuul依赖无法成功，需要手动添加到maven库。

<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-zuul -->
<dependency>
	<groupId>org.springframework.cloud</groupId>
	<artifactId>spring-cloud-starter-zuul</artifactId>
	<version>1.4.3.RELEASE</version>
</dependency>
		
<!-- https://mvnrepository.com/artifact/com.netflix.zuul/zuul-core -->
<dependency>
	<groupId>com.netflix.zuul</groupId>
	<artifactId>zuul-core</artifactId>
	<version>1.3.0</version>
</dependency>

4.分布式配置中心(Spring Cloud Config)

1） server：

关于server部分，主要注意一下，uri和对应的git中的命名规则组合。

如SpringcloudConfig/respo/config-client-dev.properties

想取到config-client-dev.properties，则uri对应的为：http://localhost:8888/config-client/dev

http请求地址和资源文件映射如下:

/{application}/{profile}[/{label}]
/{application}-{profile}.yml
/{label}/{application}-{profile}.yml
/{application}-{profile}.properties
/{label}/{application}-{profile}.properties
server:
  port: 8888
spring:
  application:
    name: config-server
  cloud:
    config:
      server:
        git:
          uri: https://github.com/forezp/SpringcloudConfig/
          searchPaths: respo
          #uri: https://github.com/eddie-code/SpringCloudDemo
          #searchPaths: config-repo
    label: master
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

2）client

关于client，主要注意bootstrap.yml的优先级高于application.yml，所以关于外部配置写在bootstrap.yml中。

server:
  port: 8881
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
spring:
  application:
    name: config-client
  cloud:
    config:
      label: master
      profile: dev
      discovery:
        serviceId: config-server
        enabled: true
遵循上述请求地址和资源文件的映射关系，即查找的文件名为
config-client-dev.properties
@Value("${foo}")
    private String foo;

    @Value("${democonfigclient.message}")
    private String message;


    @GetMapping("/configs")
    public String configs() {
        return "This is " + foo + " ; Message: " + message;
    }
此处@value中的值要与资源文件中的key相匹配

8.消息总线(Spring Cloud Bus)

此处整合rabbitMq。RabbitMQ系列(一)：Windows下RabbitMQ安装及入门

安装完毕，此处直接使用下图架构：


一）、springcloud_EurekaConfigServer：

1）、pom.xml

添加spring-cloud-starter-bus-amqp依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>


    <groupId>com.forezp</groupId>
    <artifactId>service-ConfigServer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>


    <name>service-ConfigServer</name>
    <description>Demo project for Spring Boot</description>


    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>


    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>


    <dependencies>
		<!--eureka client -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        
    	<!-- config-server -->
    	<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>


        <!-- Spring Cloud Bus 将分布式的节点用轻量的消息代理连接起来 -->
		<!-- Rabbitmq模块 -->
		<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bus-amqp</artifactId>
        </dependency>
		<dependency>
            <groupId>org.springframework.retry</groupId>
            <artifactId>spring-retry</artifactId>
        </dependency>
        
        <!--monnitor就是在server 端设置一个监听，来接收我们发送的post信息，告诉它我们更新了配置，你可以开始刷新已经注入的值了。-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-monitor</artifactId>
        </dependency>
		
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		
		<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>


		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		
		<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        
        <!-- 修改代码后自动生效，Reload Java classes without restarting the container -->  
        <dependency>  
            <groupId>org.springframework</groupId>  
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
		    <groupId>org.springframework.boot</groupId>
		    <artifactId>spring-boot-devtools</artifactId>
		    <optional>true</optional>
		    <scope>true</scope>
		</dependency>
    </dependencies>


	<dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Camden.SR1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
</project>

2）、eurekaConfingServerApplication：

package com.imm;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
@EnableConfigServer
public class eurekaConfingServerApplication {
    public static void main(String[] args) {
        SpringApplication.run(eurekaConfingServerApplication.class, args);
    }
}

3）、application-dev.yml

此处配置rabbitmq对应的配置参数，和

management: #关闭安全验证
  security:
     enabled: false
server:
  port: 8910
spring:
  application:
    name: eureka-config-server
  cloud:
    config:
      server:
        git:
          uri: https://github.com/nihaomashaonian/cloud-demo
          searchPaths: TIMMY
          #uri: https://github.com/forezp/SpringcloudConfig/
          #searchPaths: respo
    label: master
  rabbitmq:
    host: localhost
    port: 5672
    username: guest
    password: guest
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8900/eureka/
management: #关闭安全验证
  security:
     enabled: false
 

二）、springcloud_EurekaConfigClient：

1）、pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.forezp</groupId>
	<artifactId>config-client</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>config-client</name>
	<description>Demo project for Spring Boot</description>
	
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.2.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<!--eureka client -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        
        <!--config client -->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-config</artifactId>
		</dependency>
		
		<!-- Spring Cloud Bus 将分布式的节点用轻量的消息代理连接起来 -->
		<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bus-amqp</artifactId>
        </dependency>
		
		<dependency>
            <groupId>org.springframework.retry</groupId>
            <artifactId>spring-retry</artifactId>
        </dependency>
        
		
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		
		<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		
		<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
		
		
		<!-- 修改代码后自动生效，Reload Java classes without restarting the container -->  
        <dependency>  
            <groupId>org.springframework</groupId>  
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
		    <groupId>org.springframework.boot</groupId>
		    <artifactId>spring-boot-devtools</artifactId>
		    <optional>true</optional>
		    <scope>true</scope>
		</dependency>
	</dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Dalston.SR1</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

	<!-- 上面版本可能依赖一些snapshots版本，添加spring的资源 -->
	<repositories>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>
</project>

2）、eurekaConfingClientApplication

package com.imm;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
public class eurekaConfingClientApplication {
	public static void main(String[] args) {
		SpringApplication.run(eurekaConfingClientApplication.class, args);
	}
}

3）、HelloControler

这里@RefreshScope是重点，即代码中需要动态刷新配置，在需要的类上加上该注解就行，

开始尝试很多次，始终接收不到参数

Received remote refresh request. Keys refreshed []

在对应的类中加入@RefreshScope 即可。

正确的客户端打印出的log应为：Received remote refresh request. Keys refreshed [foo]

package com.imm.amo.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RefreshScope
public class HelloControler {
	
	@Value("${foo}")
    private String foo;

    @Value("${timmy.message}")
    private String message;
    
    @Value("${server.port}")
    String port;

    @GetMapping("/configs")
    public String configs() {
        return "This is " + foo + " ;port: "+port+"; Message: " + message;
    }
}

4）、bootstrap-local.yml

server:
  port: 8911
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8900/eureka/
spring:
  application:
    name: timmy-client
  cloud:
    config:
      label: master
      profile: dev
      #uri: http://localhost:8910/
      discovery:
        serviceId: eureka-config-server   #服务名，这时如果配置服务部署多份，通过负载均衡，从而高可用。
        enabled: true
其他关于rabbitmq的配置在客户端不用配置。


参考：https://www.cnblogs.com/ityouknow/p/6931958.html   关于最后Eureka会重启的BUG
版权声明：本文来源CSDN，感谢博主原创文章，遵循 CC 4.0 by-sa 版权协议，转载请附上原文出处链接和本声明。
原文链接：https://blog.csdn.net/y670340559/article/details/79462096
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  • 发表于 2020-03-01 22:09:10
  • 阅读 ( 1125 )
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