SpringCloudAlibaba-Nacos-Discovery(二)

喜欢ヅ旅行 2023-10-14 09:00 28阅读 0赞

**目录**

父pom文件

一、配置文件中使用discovery进行服务注册

pom文件

配置文件

二、服务注册与发现进行跨服务调用

服务a

pom文件

配置文件

AController

启动类

服务b

pom文件

配置文件

BController

config

启动类

nacos服务列表

结果

--------------------

上篇介绍了nacos、nacos安装、SpringBoot使用nacos配置、SpringCloud使用nacos配置。

本篇介绍下nacos的注册与发现以及使用RestTemplate 跨进程调用。

## 父pom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 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>2.2.5.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>com.chensir</groupId>
        <artifactId>nacos-root</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>nacos-root</name>
        <description>nacos-root</description>
        <properties>
            <java.version>1.8</java.version>
            <spring.cloud.version>Hoxton.SR3</spring.cloud.version>
        </properties>
        <packaging>pom</packaging>
        <dependencyManagement>
            <dependencies>
    
    
                <dependency>
                    <groupId>org.projectlombok</groupId>
                    <artifactId>lombok</artifactId>
                    <version>1.18.24</version>
                    <optional>true</optional>
                </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-starter-alibaba-nacos-discovery</artifactId>
                    <version>2.2.1.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>com.alibaba.cloud</groupId>
                    <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
                    <version>2.2.1.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>cn.hutool</groupId>
                    <artifactId>hutool-all</artifactId>
                    <version>5.8.3</version>
                </dependency>
            </dependencies>
    
        </dependencyManagement>
    
        <modules>
            <module>nacos-spring-boot-config</module>
            <module>nacos-spring-cloud-config</module>
            <module>nacos-spring-cloud-discover-a</module>
            <module>nacos-spring-cloud-discover-b</module>
            <module>nacos-spring-cloud-openfeign-c</module>
            <module>nacos-spring-cloud-ribbon</module>
            <module>nacos-spring-cloud-gateway</module>
            <module>spring-cloud-hystrix</module>
    
        </modules>
    </project>

## 一、配置文件中使用discovery进行服务注册 ##

### pom文件 ###

服务注册与发现需要使用

<dependency>  
<groupId>com.alibaba.cloud</groupId>  
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>  
<version>2021.1</version>  
</dependency>

依赖

<?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>com.chensir</groupId>
            <artifactId>nacos-root</artifactId>
            <version>0.0.1-SNAPSHOT</version>
            <relativePath>../pom.xml</relativePath>
        </parent>
    
        <artifactId>nacos-spring-cloud-config</artifactId>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </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>
    
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
                <version>2021.1</version>
            </dependency>
          <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
                <version>2021.1</version>
            </dependency>
    
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <configuration>
                        <excludes>
                            <exclude>
                                <groupId>org.projectlombok</groupId>
                                <artifactId>lombok</artifactId>
                            </exclude>
                        </excludes>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    
    </project>

### 配置文件 ###

![177195c530e347a182d601fc2bddbb7b.png][]

![d8d25f511c84492f9b406a5e0ed89056.png][]

## 二、服务注册与发现进行跨服务调用（RestTemplate ） ##

![b5bfd0c1935a43b59f03f33996596f50.png][]

### 服务a ###

此示例由b服务调用a服务

#### pom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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>com.chensir</groupId>
            <artifactId>nacos-root</artifactId>
            <version>0.0.1-SNAPSHOT</version>
            <relativePath>../pom.xml</relativePath>
        </parent>
    
        <artifactId>nacos-spring-cloud-discover-a</artifactId>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </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>
    
            <dependency>
                <groupId>cn.hutool</groupId>
                <artifactId>hutool-all</artifactId>
            </dependency>
            
            
            
            
            
            
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            </dependency>
    
    
    
    
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <configuration>
                        <excludes>
                            <exclude>
                                <groupId>org.projectlombok</groupId>
                                <artifactId>lombok</artifactId>
                            </exclude>
                        </excludes>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    
    </project>

#### 配置文件 ####

server.port= 8097
    
    spring.application.name=nacos-app-a
    
    spring.cloud.nacos.discovery.server-addr=localhost:8848

#### AController ####

@RestController
    @Slf4j
    public class AController {
    
        @GetMapping("/echo")
        public String test(@RequestParam(value = "name",defaultValue = "这是默认值") String name) {
            String ip = NetUtil.getLocalhost().getHostAddress();
    
            return StrUtil.format("这是a应用({})输出的结果:{}",ip,name);
    
        }
    }

#### 启动类 ####

本示例由b服务去调用a服务，所以a服务只需要注册到服务中心即可。启动类上@EnableDiscoveryClient不加也无影响，但是b服务中**尽可能**加此注解（跨服务调用时**尽可能**加@EnableDiscoveryClient注解，经过测试a服务与b服务加不加此注解均可）

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

### 服务b ###

#### pom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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>com.chensir</groupId>
            <artifactId>nacos-root</artifactId>
            <version>0.0.1-SNAPSHOT</version>
            <relativePath>../pom.xml</relativePath>
        </parent>
    
        <artifactId>nacos-spring-cloud-discover-b</artifactId>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </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>
            <dependency>
                <groupId>cn.hutool</groupId>
                <artifactId>hutool-all</artifactId>
            </dependency>
    
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-loadbalancer</artifactId>
            </dependency>
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <configuration>
                        <excludes>
                            <exclude>
                                <groupId>org.projectlombok</groupId>
                                <artifactId>lombok</artifactId>
                            </exclude>
                        </excludes>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    
    </project>

#### 配置文件 ####

server.port=8072
    
    spring.application.name=nacos-app-b
    
    spring.cloud.nacos.discovery.server-addr=localhost:8848

#### BController ####

@RestController
    public class BController {
    
        @Autowired
        private RestTemplate restTemplate;
    
        @GetMapping("/test")
        public String test(@RequestParam(value = "name", defaultValue = "这是默认值") String name) {
    
    
            String ret = restTemplate.getForObject("http://nacos-app-a/echo?name="+name,String.class);
            return  ret;
        }
    }

#### config ####

@LoadBalanced 负责负载均衡 由于cloud已经把他单独拎出来了，所以需要在pom中加

<dependency>  
<groupId>org.springframework.cloud</groupId>  
<artifactId>spring-cloud-loadbalancer</artifactId>  
</dependency>

但是经过我测试不加此依赖也可使用，但还是要尽量加上！

@Configuration
    public class RestTemplateConfig {
    
        @Bean
        @LoadBalanced  // 负载均衡
        public RestTemplate restTemplate(){
            return  new RestTemplate();
        }
    }

#### 启动类 ####

@SpringBootApplication
    @EnableDiscoveryClient
    @Slf4j
    public class App {
    
        public static void main(String[] args) {
            ConfigurableApplicationContext ctx = SpringApplication.run(App.class, args);
    // 小游戏
    //        RestTemplate restTemplate = ctx.getBean(RestTemplate.class);
    //       Integer[] allBoys = new Integer[]{3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40};
    //       int index = RandomUtil.randomInt(0, allBoys.length);
    //       Integer luckyMan = allBoys[index];
    //
    //        //第一个幸运者
    //        String serverName = "app-" + luckyMan;
    //        while (true) {
    //         try {
    //                log.debug("开始调用服务：{}", serverName);
    //                String url = StrUtil.format("http://{}/echo", serverName);
    //                serverName = restTemplate.getForObject(url, String.class);
    //                log.debug("获取到新服务：{}", serverName);
    //                ThreadUtil.safeSleep(3000);
    //            } catch (Exception ex) {
    //                System.out.println(ex.getMessage());
    //                break;
    //            }
    //        }
    //        System.out.println("---------------------------------------------------");
    //        System.out.println("--------------game over----------------------------");
    //        System.out.println("---------------------------------------------------");
        }
    
    }

#### nacos服务列表 ####

![d0d3ff123f054501a83c11a7f0d18a46.png][]

#### 结果 ####

![f66382dbdb68431f95213bcb090dcdd7.png][]

[177195c530e347a182d601fc2bddbb7b.png]: https://img-blog.csdnimg.cn/177195c530e347a182d601fc2bddbb7b.png
[d8d25f511c84492f9b406a5e0ed89056.png]: https://img-blog.csdnimg.cn/d8d25f511c84492f9b406a5e0ed89056.png
[b5bfd0c1935a43b59f03f33996596f50.png]: https://img-blog.csdnimg.cn/b5bfd0c1935a43b59f03f33996596f50.png
[d0d3ff123f054501a83c11a7f0d18a46.png]: https://img-blog.csdnimg.cn/d0d3ff123f054501a83c11a7f0d18a46.png
[f66382dbdb68431f95213bcb090dcdd7.png]: https://img-blog.csdnimg.cn/f66382dbdb68431f95213bcb090dcdd7.png