简单实践 java spring cloud nacos注册中心

1.概要

1.1 说明

使用nacos做为注册中

1.2 要点

```
spring-cloud-alibaba-dependencies
```

spring-cloud-starter-alibaba-nacos-discovery

```
spring-boot-starter-web
```
```
@SpringBootApplication
```
```
@EnableDiscoveryClient
```
```
SpringApplication.run(Main.class);
```
```
@RestController
```
```
@RequestMapping("/fun")
```

cloud:
  nacos:
    discovery:
      server-addr: localhost:8848

@Bean
//@LoadBalanced
public RestTemplate restTemplate()

```
@Autowired
RestTemplate restTemplate;
```

2 代码

2.1 父工程

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.2.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.xjc.springcloundtest</groupId>
    <artifactId>demo9</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>
    <name>demo9</name>
    <description>demo9</description>
    <modules>
        <module>untitled</module>
        <module>untitled1</module>
        <module>untitled2</module>
        <module>untitled3</module>
    </modules>
    <properties>
        <java.version>21</java.version>
        <spring-cloud.version>2023.0.0</spring-cloud.version>
        <spring-cloud-alibaba.version>2020.0.RC1</spring-cloud-alibaba.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!-- spring cloud alibaba 依赖 -->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring-cloud-alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

2.2 服务工程

2.2.1 工程文件

<?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.xjc.springcloundtest</groupId>
        <artifactId>demo9</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <artifactId>untitled</artifactId>

    <properties>
        <maven.compiler.source>21</maven.compiler.source>
        <maven.compiler.target>21</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
<!--        <dependency>-->
<!--            <groupId>org.springframework.cloud</groupId>-->
<!--            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>-->
<!--        </dependency>-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    </dependencies>
</project>

2.2.2 配置文件

spring:
  application:
    name: server1
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
#eureka:
#  client:
#    service-url:
#      defaultZone: http://127.0.0.1:10086/eureka/

2.2.3 主函数

package com.xjc.springcloundtest;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class Main {
    public static void main(String[] args) {
        SpringApplication.run(Main.class);
        System.out.println("Hello world!");
    }
}

2.2.4 服务接口

package com.xjc.springcloundtest;

import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
//@EnableDiscoveryClient
public class TestController {
    @RequestMapping("/fun")
    public String fun(){
        return "函数1";
    }
}

2.2.5 运行效果

2.3 消费工程

2.3.1 工程文件

<?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.xjc.springcloundtest</groupId>
        <artifactId>demo9</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <artifactId>untitled1</artifactId>

    <properties>
        <maven.compiler.source>21</maven.compiler.source>
        <maven.compiler.target>21</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
<!--        <dependency>-->
<!--            <groupId>org.springframework.cloud</groupId>-->
<!--            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>-->
<!--        </dependency>-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    </dependencies>
</project>

2.3.2 配置文件

server:
  port: 8081
spring:
  application:
    name: server2
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
#eureka:
#  client:
#    service-url:
#      defaultZone: http://127.0.0.1:10086/eureka/

2.3.3 主函数

package com.xjc.springcloundtest;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
//@EnableDiscoveryClient
public class Main {
    public static void main(String[] args) {
        SpringApplication.run(Main.class);
        System.out.println("Hello world!");
    }

    @Bean
    //@LoadBalanced
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
}

2.3.4 消费函数

package com.xjc.springcloundtest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class TestController {
    @Autowired
    RestTemplate restTemplate;

    @RequestMapping("/fun")
    public String fun(){
        //String url = "http://server1/fun";
        String url = "http://localhost:8080/fun";
        String ret = restTemplate.getForObject(url,String.class);
        return "函数2"+ret;
    }


}

2.3.5 运行效果