Spring Cloud 微服务备忘
nacos
1.下载，解压，执行: startup.bat -m standalone 即可用localhost:8848/nacos 进行访问。
2.新建Maven 项目，pom里定义boot cloud alibaba的版本号
引入：
<dependencyManagement><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-dependencies</artifactId><version>${spring-boot.version}</version><type>pom</type><scope>import</scope></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${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-alibaba.version}</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement>
在项目里加入一个 springboot的模块项目，加入依赖：
<dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId> </dependency> <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-bootstrap</artifactId> </dependency>
再新建启动类和一个Controller 。
3.建立一个发现服务：新建一个子模块，依赖为：
<dependencies><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId></dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-bootstrap</artifactId></dependency> </dependencies>
配置为：
server.port=8083 server.servlet.context-path=/spring.application.name=nacos-info spring.cloud.nacos.server-addr=www.xxxx.com:8848 spring.cloud.nacos.discovery.server-addr=www.xxxxx.com:8848
启动类上加：
@SpringBootApplication @EnableDiscoveryClient
注意：如果nacosserver是远程的，本地调试也要把8848的服务启动起来，否则会报错：连接类的错。
4.服务调用，使用OpenFeign：
首先，在调用服务的项目上添加依赖：注意加：spring-cloud-loadbalancer
<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId> </dependency> <!--解决：Did you forget to include spring-cloud-starter-loadbalancer?--> <dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-loadbalancer</artifactId> </dependency>
其次，写一个feign的service:
@FeignClient("nacos-info")//这是服务名
public interface InfoFeignService {@RequestMapping("/info/get")public String get(@RequestParam("name") String name);
}
再者：写一个调用服务的Action:
@Resource InfoFeignService infoFeignService;
@RequestMapping("/info")
public String getInfo(String key){return infoFeignService.get(key);
}
最后，项目启动类上加：
@EnableFeignClients(basePackages = "org.xxxx.feign")
即可调用服务。