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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。