02.Sentinel初始化演示工程

Leefs 2023-01-14 PM 1692℃ 0条

[TOC]

#### 前言

**准备环境**：

+ JDK 1.8
+ nacos 2.1.0
+ sentinel-dashboard 1.8.5

本次演示都是在本地windows系统上进行，只是入门级。

#### 1、启动Nacos服务

+ windows系统Nacos启动命令（nacos服务bin目录下）

```
startup.cmd -m standalone
```

#### 2、新建Module

+ 名称：**sentinel-service-demo01**

![02.Sentinel初始化演示工程01.jpg](https://lilinchao.com/usr/uploads/2023/01/1919087492.jpg)

#### 3、引入pom依赖

基本上nacos和sentinel都是一起配置

```xml
<?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>
    <parent>
        <groupId>com.lilinchao</groupId>
        <artifactId>SpringCloudAlibabaDemo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

<groupId>com.lilinchao.springcloud</groupId>
    <artifactId>sentinel-service-demo01</artifactId>

<dependencies>
        
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-datasource-nacos</artifactId>
        </dependency>
        
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>4.6.3</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>
```

#### 4、配置application.yaml文件

```yaml
server:
  port: 8401

spring:
  application:
    name: sentinel-service-demo01
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848 #Nacos服务注册中心地址
    sentinel:
      transport:
        #配置Sentinel dashboard地址
        dashboard: localhost:8050
        #默认8719端口，假如被占用会自动从8719开始依次+1扫描,直至找到未被占用的端口
        port: 8719

management:
  endpoints:
    web:
      exposure:
        include: '*'
```

#### 5、主启动类

```java
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@EnableDiscoveryClient
@SpringBootApplication
public class SentinelServiceDemo01Application {
    public static void main(String[] args) {
        SpringApplication.run(SentinelServiceDemo01Application.class, args);
    }
}
```

#### 6、业务类

+ 创建FlowLimitController

```java
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class FlowLimitController {
    @GetMapping("/testA")
    public String testA() {
        return "------testA";
    }

@GetMapping("/testB")
    public String testB() {
        return "------testB";
    }
}
```

#### 7、测试

**（1）启动sentinel-dashboard-1.8.5.jar**

```
java -jar -Dserver.port=8050 sentinel-dashboard-1.8.5.jar
```

**（2）启动微服务sentinel-service-demo01，并查看**

+ 查看Nacos服务列表

![02.Sentinel初始化演示工程02.jpg](https://lilinchao.com/usr/uploads/2023/01/1657973800.jpg)

+ 查看Sentinel 控制台

![02.Sentinel初始化演示工程03.jpg](https://lilinchao.com/usr/uploads/2023/01/1100545462.jpg)

因为Sentinel采用懒加载机制，所以启动服务并没有立即看到服务信息

**（3）浏览器访问一下如下地址**

```
http://localhost:8401/testA  
```

**（4）再次刷新Sentinel 控制台可以看到如下信息**

![02.Sentinel初始化演示工程04.jpg](https://lilinchao.com/usr/uploads/2023/01/1595681381.jpg)

标签: SpringCloudAlibaba, Sentinel

非特殊说明，本博所有文章均为博主原创。

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