前言

• spring-boot 2.0.0.RELEASE
• maven 3.5.0
• Eclipse Version: 2019-09 R (4.13.0)
• spring-cloud Finchley.RELEASE

改造過程

添加依賴

在 POM (pom.xml)中添加依賴

<?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>xxx</groupId><artifactId>xxx</artifactId><version>1.0</version><packaging>jar</packaging><name>xxx</name><description>Demo project for Spring Boot</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.0.0.RELEASE</version><relativePath /> <!-- lookup parent from repository --></parent><properties>...<spring-cloud.version>Finchley.RELEASE</spring-cloud.version></properties><dependencies>...<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-eureka-client</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</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>... </project>

啟用 Spring Cloud 能力

在 Application 類中添加 @EnableEurekaClient、@EnableDiscoveryClient 和 @EnableFeignClients，如下：

import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; import org.springframework.cloud.openfeign.EnableFeignClients;@SpringBootApplication @EnableEurekaClient @EnableDiscoveryClient @EnableFeignClients public class Application {public static void main(String[] args) throws IOException {SpringApplication.run(Application.class, args);} }

連入 Eureka Server

在 application.properties 中添加配置：

# 為服務指定個名字 spring.application.name=microservice-hello#eureka client configuration eureka.client.serviceUrl.defaultZone=http://localhost:12000/eureka/# 調用者添加如下配置，可以避免異常：Read timed out hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=6000 spring.cloud.loadbalancer.retry.enabled=true ribbon.ReadTimeout=60000 ribbon.ConnectTimeout=60000

異常：Read timed out

添加服務

略。

調用服務

略。

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總結

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