高可用服务注册中心、服务提供者、服务消费者|微服务配置内容
前言:
高可用服务注册中心:首先要知道什么是一个高可用的服务注册中心,基于spring boot建成的服务注册中心是一个单节点的服务注册中心,这样一旦发生了故障,那么整个服务就会瘫痪,所以我们需要一个高可用的服务注册中心,那么在Eureka中,我们通过集群来解决这个问题。啥叫集群呢?就是多配几个,一个服务注册中心挂了,还有另一个。
服务提供者:被其他微服务调用的微服务
服务消费者:调用的其他微服务的微服务
另外要注意jdk的版本需要1.8或1.8以上,否则无法执行。
1 但这里我遇到了一个奇怪的问题:本来我的jdk版本是1.6的,我需要更换。但是怎么配置环境
2 变量,在命令行输入java -version仍然是1.6,这里并不是配错了,而是在安装JDK1.6时,
3 自动将java.exe、javaw.exe、javaws.exe三个可执行文件复制到了C:\Windows
4 \System32目录,我们所执行的java命令正是这个java.exe所以我们先需要将这3个可执行
5 文件删除,然后再配置jdk1.8
另附java环境搭建方法
https://jingyan.baidu.com/article/c85b7a6414f2ee003bac95d5.html
那开始项目吧!
1、首先创建一个高可用的服务注册中心吧,取名为erueka-server
2、pom.xml内容配置
1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 3 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4 <modelVersion>4.0.0</modelVersion> 5 6 <groupId>wfw.wlovet</groupId> 7 <artifactId>eureka-server</artifactId> 8 <version>0.0.1-SNAPSHOT</version> 9 <packaging>jar</packaging> 10 11 <name>eureka-server</name> 12 <description>Demo project for Spring Boot</description> 13 14 <parent> 15 <groupId>org.springframework.boot</groupId> 16 <artifactId>spring-boot-starter-parent</artifactId> 17 <version>1.5.6.RELEASE</version> 18 <relativePath/> <!-- lookup parent from repository --> 19 </parent> 20 21 <properties> 22 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 23 <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> 24 <java.version>1.8</java.version> 25 </properties> 26 27 <dependencies> 28 <dependency> 29 <groupId>org.springframework.boot</groupId> 30 <artifactId>spring-boot-starter</artifactId> 31 </dependency> 32 33 <dependency> 34 <groupId>org.springframework.cloud</groupId> 35 <artifactId>spring-cloud-starter-eureka-server</artifactId> 36 </dependency> 37 38 <dependency> 39 <groupId>org.springframework.boot</groupId> 40 <artifactId>spring-boot-starter-test</artifactId> 41 <scope>test</scope> 42 </dependency> 43 </dependencies> 44 45 <dependencyManagement> 46 <dependencies> 47 <dependency> 48 <groupId>org.springframework.cloud</groupId> 49 <artifactId>spring-cloud-dependencies</artifactId> 50 <version>Dalston.SR3</version> 51 <type>pom</type> 52 <scope>import</scope> 53 </dependency> 54 </dependencies> 55 </dependencyManagement> 56 <build> 57 <plugins> 58 <plugin> 59 <groupId>org.springframework.boot</groupId> 60 <artifactId>spring-boot-maven-plugin</artifactId> 61 </plugin> 62 </plugins> 63 </build> 64 </project>
3、两个配置文件之peer1的内容
1 server.port=1111 2 eureka.instance.hostname=peer1 3 eureka.client.register-with-eureka=false 4 eureka.client.fetch-registry=false 5 eureka.client.service-url.defaultZone=http://peer2:1112/eureka/
4、两个配置文件之peer2的内容
1 server.port=1112 2 eureka.instance.hostname=peer2 3 eureka.client.register-with-eureka=false 4 eureka.client.fetch-registry=false 5 eureka.client.service-url.defaultZone=http://peer1:1111/eureka/
关于这两个配置文件需要知道如下几点:
1.在peer1的配置文件中,让它的service-url指向peer2,在peer2的配置文件中让它的service-url指向peer1
2.为了让peer1和peer2能够被正确的访问到,我们需要在C:\Windows\System32\drivers\etc目录下的hosts文件总添加两行配置,如下:
127.0.0.1 peer1
127.0.0.1 peer2
3.由于peer1和peer2互相指向对方,实际上我们构建了一个双节点的服务注册中心集群
5、java程序启动代码
1 import org.springframework.boot.SpringApplication; 2 import org.springframework.boot.autoconfigure.SpringBootApplication; 3 import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; 4 5 @EnableEurekaServer 6 @SpringBootApplication 7 public class Application { 8 public static void main(String[] args) { 9 SpringApplication.run(Application.class, args); 10 } 11 }
最后包的结构:
6、将该maven项目打包成可执行的.jar文件
选中pom.xml文件,右击鼠标点击run,选择Maven install,等待即可
7、生成jar文件之后,我们在命令行通过java命令来启动项目,在启动的时候我们可以设置采用不同的配置文件来启动项目,命令如下:
1 java -jar eureka-server-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer1 2 java -jar eureka-server-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer2
8、在浏览器中进行验证
输入localhost:1111与localhost:1112
9、接下来创建一个服务提供者,取名为server-provider
10、pom.xml配置为
<?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>wfw.wlovet</groupId> <artifactId>provider</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>provider</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.6.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> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka</artifactId> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Dalston.SR3</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> </project>
11、application.properties的配置为
spring.application.name=hello-service eureka.client.serviceUrl.defaultZone=http://peer1:1111/eureka/,http://peer2:1112/eureka/
12、控制类HelloController代码为
package com.wlovet.controller; import java.util.List; import org.apache.log4j.Logger; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.cloud.client.ServiceInstance; import org.springframework.cloud.client.discovery.DiscoveryClient; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; @RestController public class HelloController { private final Logger logger = Logger.getLogger(getClass()); @Autowired private DiscoveryClient client; @RequestMapping(value = "/hello", method = RequestMethod.GET) public String index() { List<ServiceInstance> instances = client.getInstances("hello-service"); for (int i = 0; i < instances.size(); i++) { logger.info("/hello,host:" + instances.get(i).getHost() + ",service_id:" + instances.get(i).getServiceId()); } return "Hello World"; } }
13、启动类ServerApplication代码为
package com.wlovet; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; @SpringBootApplication @EnableDiscoveryClient//此处注解必须 public class ServerApplication { public static void main(String[] args) { SpringApplication.run(ServerApplication.class, args); } }
14、打包成可执行的jar文件|打包教程请看上文
最后包的结构:
15、在命令行中输入
java -jar provider-0.0.1-SNAPSHOT.jar --server.port=8081
java -jar provider-0.0.1-SNAPSHOT.jar --server.port=8082
16、最后创建一个服务消费者,取名为ribbon-consumer
17、pom.xml配置为,此处增加了spring-cloud-starter-ribbon
<?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>wfw.wlovet</groupId> <artifactId>ribbon-consumer</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>ribbon-consumer</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.6.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> <spring-cloud.version>Dalston.SR3</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-ribbon</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-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.apache.xbean</groupId> <artifactId>xbean-spring</artifactId> <version>4.2</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId> spring-boot-starter-data-elasticsearch </artifactId> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</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> </project>
18、application.propertes配置内容为(作为测试我只打开一个服务注册中心)
spring.application.name=ribbon-consumer server.port=9000 eureka.client.service-url.defaultZone=http\://peer1\:1111/eureka
19、启动类ConsumerApplication的内容为
import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; import org.springframework.cloud.client.loadbalancer.LoadBalanced; import org.springframework.context.annotation.Bean; import org.springframework.web.client.RestTemplate; @SpringBootApplication @EnableDiscoveryClient public class ConsumerApplication { public static void main(String[] args) { SpringApplication.run(ConsumerApplication.class, args); } //LoadBalanced负责加载负载均衡 @LoadBalanced @Bean RestTemplate restTemplate() { //RestTemplate为负载均衡 return new RestTemplate(); } }
20、控制转发类ConsumerController的内容为
import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.client.RestTemplate; @RestController public class ConsumerController { @Autowired RestTemplate restTemplate; @RequestMapping(value = "/ribbon-consumer", method = RequestMethod.GET) public String helloController() { return restTemplate.getForEntity("http://hello-service/hello", String.class).getBody(); } }
最后包的结构:
21、测试项目
启动服务注册中心---->启动服务提供项目---->启动服务消费项目---->在浏览器内输入localhost:9000/ribbon-consumer
结果为:
至此,简单的微服务就搭好了!
em。。。。但我在运行ribbon-consumer的时候又遇到一个奇怪的问题,感觉我好像说过相同的话。。。
啊?有点莫名奇妙-.-!,然后自己手动导包解决的,em。。。。不知所以然
本文来自博客园,作者:sum墨,转载请注明原文链接:https://www.cnblogs.com/wlovet/p/7955620.html