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# Spring Cloud Polaris Discovery example
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## 样例简介
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本样例将介绍如何在Spring Cloud项目中使用```spring-cloud-starter-tencent-polaris-discovery```以使用其各项功能。
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该样例分为两个微服务,即discovery-caller-service和discovery-callee-service。其中,discovery-caller-service对discovery-callee-service发生调用。
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## 使用说明
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### 修改配置
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配置如下所示。其中,${ip}和${port}为Polaris后端服务的IP地址与端口号。
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```yaml
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spring:
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application:
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name: ${application.name}
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cloud:
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polaris:
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address: ${ip}:${port}
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```
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### 启动样例
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#### 启动Polaris后端服务
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参考[Polaris Getting Started](https://github.com/PolarisMesh/polaris#getting-started)。
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#### 启动应用
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- IDEA启动
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分别启动```spring-cloud-tencent-examples/polaris-discovery-example/discovery-caller-service```下的```DiscoveryCallerService```和```spring-cloud-tencent-examples/polaris-discovery-example/discovery-callee-service```下的```DiscoveryCalleeService```。
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- Maven打包启动
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在```spring-cloud-tencent-examples/polaris-discovery-example```下执行
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```sh
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mvn clean package
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```
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然后在```discovery-caller-service```和```discovery-callee-service```下找到生成的jar包,运行
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```
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java -jar ${app.jar}
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```
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启动应用,其中${app.jar}替换为对应的jar包名。
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### 验证
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#### Feign调用
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执行以下命令发起Feign调用,其逻辑为```DiscoveryCalleeService```返回value1+value2的和
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```shell
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curl -L -X GET 'http://localhost:48080/discovery/service/caller/feign?value1=1&value2=2'
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```
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预期返回值
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```
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3
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```
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#### RestTemplate调用
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执行以下命令发起RestTemplate调用,其逻辑为```DiscoveryCalleeService```返回一段字符串
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```shell
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curl -L -X GET 'http://localhost:48080/discovery/service/caller/rest'
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```
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预期返回值
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```
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Discovery Service Callee
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```
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