服务注册与发现Eureka- 单机Eureka构建步骤
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构建Eureka Server 端服务注册中心
新建Module:cloud-eureka-server7001
POM:
<?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"> <parent> <artifactId>yct-cloud-parent</artifactId> <groupId>com.yct.springcloud</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>cloud-eureka-server7001</artifactId> <dependencies> <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <dependency> <groupId>com.yct.springcloud</groupId> <artifactId>cloud-base-api</artifactId> <version>${project.version}</version> <scope>compile</scope> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> <optional>true</optional> </dependency> <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> </dependency> </dependencies> </project>
POM中Cloud 1.X 和 Cloud 2.X 的区别:
YML:
server: port: 7001 eureka: instance: hostname: localhost #eureka服务端的实例名字 client: register-with-eureka: false #表识不向注册中心注册自己 fetch-registry: false #表示自己就是注册中心,职责是维护服务实例,并不需要去检索服务 service-url: defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/ #设置与eureka server交互的地址查询服务和注册服务都需要依赖这个地址
主启动类:
添加注解:@EnableEurekaServer
package com.yct.springcloud; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; @EnableEurekaServer @SpringBootApplication public class EurekaServerApplication7001 { public static void main(String[] args) { SpringApplication.run(EurekaServerApplication7001.class,args); } }
测试运行:
Eureka Client 端 将cloud-provider-payment8001 注册进 Eureka Server 成为服务提供者 provider
修改 模块:cloud-provider-payment8001
POM:
<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency>
POM中Cloud 1.X 和 Cloud 2.X 的区别:
YML:
eureka: client: register-with-eureka: true fetchRegistry: true service-url: defaultZone: http://localhost:7001/eureka
主启动类:
添加注解:@EnableEurekaClient
启动测试:
要先启动EurekaServer,再启动当前客户端。
服务名对应:
Eureka Client 端 将cloud-consumer-order80 注册进 Eureka Server 成为服务消费者 consumer
添加POM:
<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency>
YML:
server: port: 8080 spring: application: name: cloud-order-service eureka: client: register-with-eureka: true fetchRegistry: true service-url: defaultZone: http://localhost:7001/eureka
主启动类:
添加注解:@EnableEurekaClient
测试运行:
要先启动EurekaServer,再启动当前客户端。
访问Consumer接口:
http://localhost:8080/consumer/payment/get/11
问题:
为什么集成了Eureka 后,返回的数据由原来的 JSON 变成了 xml 格式的呢?
原因:
集成EurekaClient,会需要jackson-dataformat-xml这个依赖
jackson-dataformat-xml这个依赖,可以将实体转换为xml也可以转换为json,根据发起请求的request头中Accept来决定
如上这个请求,application/xml 在最后匹配json的*/ *前面,优先级高过json,所以返回了XML。
而下面这种方式,就返回了 json。
解决方案1:
在 cloud-consumer-order8080 的 pom 中,将包 spring-cloud-starter-netflix-eureka-client 包内的 jackson-dataformat-xml 包排除即可。
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> <exclusions> <exclusion> <groupId>com.fasterxml.jackson.dataformat</groupId> <artifactId>jackson-dataformat-xml</artifactId> </exclusion> </exclusions> </dependency>
解决方案2:
不把POM中的 jackson-dataformat-xml 包去掉的前提下,在 cloud-consumer-order8080 的接口中,mapping 注解上添加 produces = { "application/json;charset=UTF-8" }
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