//by yan 20211119

需求：

簡單建個項目，用來測試調用注冊在nacos的服務接口。

步驟：

idea -> new project-> Spring Initializr

踩坑：

1、開始是maven包引入報錯。修改各種配置 pom repositories 、 maven 配置等，有時還要刪除項目.idea重啟idea。總結大多是maven的版本問題。最后都是使用idea 自帶版本 “Bundled (Maven 3)” 就ok。

2、spring boot 和spring cloud 版本問題
spring boot 和spring cloud 版本必須對應。這個其實用Spring Initializr向導創建的項目，生成的pom.xml就可保證這點了。

3、SpringCloud OpenFeign報錯：No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-loadbalancer?
原因：
由于Spring Cloud Feign在Hoxton.M2 RELEASED版本之后不再使用Ribbon而是使用spring-cloud-loadbalancer，所以不引入spring-cloud-loadbalancer會報錯.
解決：
加入spring-cloud-loadbalancer依賴 并且在nacos中排除ribbon依賴，不然loadbalancer無效

4、只是簡單測試調用的項目，nacos config可以不用配置。配置了會受nacos配置中心的配置影響。

org.springframework.cloud spring-cloud-loadbalancer com.alibaba.cloud spring-cloud-starter-alibaba-nacos-discovery ${nacos.version} com.netflix.ribbon ribbon

pom.xml 全內容：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.5.7</version><!--<version>2.0.9.RELEASE</version>--><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.example</groupId><artifactId>demo2</artifactId><version>0.0.1-SNAPSHOT</version><name>demo2</name><description>Demo project for Spring Boot</description><properties><java.version>11</java.version><spring-cloud.version>2020.0.4</spring-cloud.version><!--<spring-cloud.version>Finchley.SR4</spring-cloud.version>--><!--nacos test--><nacos.serverName>oa-server</nacos.serverName><spring.cloud.nacos.discovery.server-addr>172.25.70.1:18848,172.25.70.10:18848,172.25.70.9:18848</spring.cloud.nacos.discovery.server-addr><spring.cloud.nacos.discovery.cluster-name>default</spring.cloud.nacos.discovery.cluster-name><spring.cloud.nacos.discovery.group>DEFAULT_GROUP</spring.cloud.nacos.discovery.group><spring.cloud.nacos.config.server-addr>172.25.70.1:18848,172.25.70.10:18848,172.25.70.9:18848</spring.cloud.nacos.config.server-addr><spring.cloud.nacos.config.file-extension>properties</spring.cloud.nacos.config.file-extension><spring.cloud.nacos.config.group>DEFAULT_GROUP</spring.cloud.nacos.config.group><!--lv_3_id--><spring.cloud.nacos.discovery.namespace>docusign</spring.cloud.nacos.discovery.namespace><spring.cloud.nacos.discovery.port>8990</spring.cloud.nacos.discovery.port><!--0.1.1.RELEASE 2.0.2.RELEASE 2.2.0.RELEASE 2021.1--><nacos.version>2.0.2.RELEASE</nacos.version></properties><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-loadbalancer</artifactId></dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId><version>${nacos.version}</version><exclusions><exclusion><groupId>com.netflix.ribbon</groupId><artifactId>ribbon</artifactId></exclusion></exclusions></dependency><!--<dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId><version>${nacos.version}</version></dependency>--><!-- <dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId><version>${nacos.version}</version></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId><version>${nacos.version}</version></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-autoconfigure</artifactId></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.1.14.RELEASE</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.60</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>2.9.10</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.10.3</version></dependency></dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${spring-cloud.version}</version><type>pom</type><scope>import</scope></dependency><!--<dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-alibaba-dependencies</artifactId><version>${spring-cloud.version}</version><type>pom</type><scope>import</scope></dependency>--></dependencies></dependencyManagement><repositories><repository><id>aliyun maven</id><url>http://maven.aliyun.com/nexus/content/repositories/central/</url></repository></repositories><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><mainClass>com.example.demo2.Demo2Application</mainClass></configuration></plugin><plugin><artifactId>maven-resources-plugin</artifactId><configuration><encoding>utf-8</encoding><useDefaultDelimiters>true</useDefaultDelimiters></configuration></plugin></plugins></build></project>

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