SpringCloud+Gateway+nacos+sentinel入门

nacos的安装

从官方网站（https://github.com/alibaba/nacos/releases)下载稳定版1.3.2

以单机模式启动nacos

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bin/nacos -m standalone

创建2个工程

spring-nacos-provider, spring-nacos-gateway

spring-nacos-provider

  1. 在pom.xml中添加依赖项
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<dependency>

  <groupId>org.springframework.boot</groupId>

  <artifactId>spring-boot-starter-web</artifactId>

</dependency>

<dependency>

  <groupId>com.alibaba.cloud</groupId>

  <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>

</dependency>

<dependency>

  <groupId>com.alibaba.cloud</groupId>

  <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>

</dependency>

<dependency>

  <groupId>org.springframework.boot</groupId>

  <artifactId>spring-boot-configuration-processor</artifactId>

	<optional>true</optional>

</dependency>

<dependency>

	<groupId>org.projectlombok</groupId>

	<artifactId>lombok</artifactId>

	<optional>true</optional>

</dependency>
  1. 添加配置文件bootstrap.properties
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# Nacos帮助文档: https://nacos.io/zh-cn/docs/concepts.html

# Nacos认证信息

spring.cloud.nacos.config.username=nacos

spring.cloud.nacos.config.password=nacos

spring.cloud.nacos.config.contextPath=/nacos

# 设置配置中心服务端地址

spring.cloud.nacos.config.server-addr=127.0.0.1:8848

# Nacos 配置中心的namespace，默认为 public

spring.cloud.nacos.config.namespace=public

spring.cloud.nacos.config.file-extension=yaml
  1. 修改配置文件application.yml
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server:

port: 8081

spring:

application:

name: demo-service

cloud:

nacos:

discovery:

namespace: public

password: nacos

server-addr: 127.0.0.1:8848

username: nacos
  1. 添加一个HelloController
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@RestController

@Slf4j

public class HelloController {

  @GetMapping("/foo")

  public String foo(String name) {

  	return "hello "+ name;

  }

}
  1. 启动项目后，访问http://localhost:8081/foo?name=张三，可以得到如下图示

image-20210423141827576

此时服务提供端已经配置好了

spring-nacos-gateway

  1. 在pom.xml中添加如下依赖
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<dependency>

  <groupId>com.alibaba.cloud</groupId>

  <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>

</dependency>

<dependency>

  <groupId>com.alibaba.cloud</groupId>

  <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>

</dependency>

<dependency>

  <groupId>org.springframework.cloud</groupId>

  <artifactId>spring-cloud-starter-gateway</artifactId>

</dependency>

<dependency>

  <groupId>org.springframework.boot</groupId>

  <artifactId>spring-boot-configuration-processor</artifactId>

  <optional>true</optional>

</dependency>

<dependency>

  <groupId>org.projectlombok</groupId>

  <artifactId>lombok</artifactId>

  <optional>true</optional>

</dependency>

<dependency>

  <groupId>com.alibaba</groupId>

  <artifactId>fastjson</artifactId>

  <version>1.2.72</version>

</dependency>

<dependency>

  <groupId>com.alibaba.csp</groupId>

  <artifactId>sentinel-spring-cloud-gateway-adapter</artifactId>

  <version>1.8.0</version>

</dependency>

<dependency>

  <groupId>com.alibaba.cloud</groupId>

  <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>

</dependency>

<dependency>

	<groupId>com.alibaba.cloud</groupId>

	<artifactId>spring-cloud-alibaba-sentinel-datasource</artifactId>

</dependency>
  1. 添加配置文件bootstrap.properties
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# Nacos帮助文档: https://nacos.io/zh-cn/docs/concepts.html

# Nacos认证信息

spring.cloud.nacos.config.username=nacos

spring.cloud.nacos.config.password=nacos

spring.cloud.nacos.config.contextPath=/nacos

# 设置配置中心服务端地址

spring.cloud.nacos.config.server-addr=127.0.0.1:8848

# Nacos 配置中心的namespace，默认为 public

spring.cloud.nacos.config.namespace=public

spring.cloud.nacos.config.file-extension=yaml
  1. 修改配置文件application.yml
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server:

port: 8080

spring:

application:

name: gateway

cloud:

nacos:

discovery:

namespace: public

password: nacos

server-addr: 127.0.0.1:8848

username: nacos

gateway:

discovery:

locator:

enabled: true

lower-case-service-id: true

routes:

	- id: spring-nacos-provider

		uri: lb://spring-nacos-provider

		predicates:

	- Path=/provider/**

filters:

	- StripPrefix=1
  1. 启动应用，访问http://localhost:8080/provider/foo?name=张三

image-20210423142014725

完成网关接入。下面配合nacos，添加配置

在nacos中添加spring-nacos-provider.yaml的配置,注意选择类型为yaml

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didi:

	title: "架构师"

修改HelloController

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@RestController

@Slf4j

public class HelloController {

  @Value("${didi.title}")

  private String title;
  

  @GetMapping("/foo")

  public String foo(String name) {

  	return "hello "+ name + ", my title is " + title;

  }

}

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