Java（六）：Eureka项目搭建、数据请求

编程语言 2023-10-04 20:34:37 阅读次数: 0

Eureka项目搭建、数据请求

Eureka简介

Eureka采用的是Server/Client的模式进行设计。

Server扮演了服务注册中心的角色，为Client提供服务注册和发现的功能，维护着注册到自身的Client的相关信息，同时提供接口给Client获取到注册表中其他服务的信息。

Client将有关自己的服务的信息通过一定的方式登记到Server上，并在正常范围内维护自己信息的一致性，方便其他服务发现自己，同时可以通过Server获取到自己的依赖的其他服务信息，从而完成服务调用。

Eureka功能主要包括：服务注册、服务续约、服务剔除、服务下线、获取注册表信息、远程调用等。

  • 以下是Eureka几个角色的解释：
    • Eureka服务端：负责服务注册、发现并管理每项服务的中心。
    • Eureka实例：服务（如订单系统）部署多个服务器，每个服务器上提供的服务都是实例。
    • Eureka服务：指提供特定服务功能的服务，例如：订单系统，同一服务可以提供多个实例;
    • Eureka客户端：主要向服务中心注册自己成为服务。但它既可以是服务提供者，也可以是消费者。它与Eureka实例感觉相似，但实际上意义不同。

Eureka项目创建

1、新建Maven项目

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2、只保留Maven项目的依赖文件

pom.xml文件作为后续创建的子模块依赖的父依赖文件

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3、创建子模块（Eureka服务模块）

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4、修改pom.xml

demo/pom.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>
    <groupId>com.example.demo</groupId>
    <artifactId>demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <packaging>pom</packaging>

    <modules>
        <module>demo-eureka</module>
    </modules>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.6.13</spring-boot.version>
        <spring-cloud.version>2021.0.5</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${spring-boot.version}</version>
                <executions>
                    <execution>
                        <id>repackage</id>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

demo/demo-eureka/pom.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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <parent>
        <groupId>com.example.demo</groupId>
        <artifactId>demo</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>
    <artifactId>demo-eureka</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo-eureka</name>
    <description>demo-eureka</description>

</project>

5、创建并修改配置文件

demo/demo-eureka/src/main/resources/application.yml

server:
  port: 8000

spring:
  application:
    name: demo-eureka

eureka:
  instance:
    hostname: 127.0.0.1
  client:
    register-with-eureka: false   # 是否将自己注册到 Eureka-Server 中，默认的为 true
    fetch-registry: false         # 是否需要拉取服务信息，默认未true
    service-url:
      defaultZone: http://${
    
    eureka.instance.hostname}:${
    
    server.port}/eureka/  # 注册中心地址

6、添加Eureka注解

demo/demo-eureka/src/main/java/com/example/demo/demoeureka/DemoEurekaApplication.java

package com.example.demo.demoeureka;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class DemoEurekaApplication {
    
    

    public static void main(String[] args) {
    
    
        SpringApplication.run(DemoEurekaApplication.class, args);
    }

}

7、运行

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8、创建其他服务

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9、修改pom.xml

demo/pom.xml

<packaging>pom</packaging>

<modules>
    <module>demo-eureka</module>
    <module>demo-one</module>
    <module>demo-two</module>
</modules>

demo/demo-one/pom.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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <parent>
        <groupId>com.example.demo</groupId>
        <artifactId>demo</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>
    <artifactId>demo-one</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo-one</name>
    <description>demo-one</description>

</project>

demo/demo-two/pom.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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <parent>
        <groupId>com.example.demo</groupId>
        <artifactId>demo</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>
    <artifactId>demo-two</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo-two</name>
    <description>demo-two</description>

</project>

10、创建并修改配置文件

把服务注册到Eureka中

demo/demo-one/src/main/resources/application.yml

server:
  port: 8001

spring:
  application:
    name: demo-one

eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8000/eureka/

demo/demo-two/src/main/resources/application.yml

server:
  port: 8002

spring:
  application:
    name: demo-two

eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8000/eureka/

11、添加Eureka注解

demo/demo-one/src/main/java/com/example/demo/demoone/DemoOneApplication.java

package com.example.demo.demoone;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableEurekaClient
@SpringBootApplication
public class DemoOneApplication {
    
    

    public static void main(String[] args) {
    
    
        SpringApplication.run(DemoOneApplication.class, args);
    }

}

demo/demo-two/src/main/java/com/example/demo/demotwo/DemoTwoApplication.java

package com.example.demo.demotwo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableEurekaClient
@SpringBootApplication
public class DemoTwoApplication {
    
    

    public static void main(String[] args) {
    
    
        SpringApplication.run(DemoTwoApplication.class, args);
    }

}

12、添加项目服务

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13、运行

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14、访问404解决

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开启监控服务配置demo/demo-one/src/main/resources/application.yml
开启监控服务配置demo/demo-two/src/main/resources/application.yml

management:
  endpoints:
    web:
      exposure:
        include: "*"

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15、项目目录结构

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搭建Eureka集群

应对服务挂了找不到服务的问题

1、准备

SwitchHosts：用于修改 IP 和 域名 的映射

https://github.com/oldj/SwitchHosts/releases

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2. 创建 Eureka Server 模块

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demo/pom.xml

<packaging>pom</packaging>

<modules>
    <module>eureka-server-01</module>
    <module>eureka-server-02</module>
    <module>eureka-server-03</module>
    <module>eureka-client-01</module>
</modules>

demo/eureka-server-01、demo/eureka-server-02、demo/eureka-server-03

  • 启动类
    • demo/eureka-server-01/src/main/java/com/example/demo/eurekaserver01/EurekaServer01Application.java
      package com.example.demo.eurekaserver01;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class EurekaServer01Application {
        
        
    public static void main(String[] args) {
        
        
        SpringApplication.run(EurekaServer01Application.class, args);
    }
}
    • demo/eu¬reka-server-02/src/main/java/com/example/demo/eurekaserver01/EurekaServer02Application.java
      package com.example.demo.eurekaserver02;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class EurekaServer02Application {
        
        
    public static void main(String[] args) {
        
        
        SpringApplication.run(EurekaServer02Application.class, args);
    }
}
    • demo/eureka-server-03/src/main/java/com/example/demo/eurekaserver01/EurekaServer03Application.java
      package com.example.demo.eurekaserver03;
  
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
  
@EnableEurekaServer
@SpringBootApplication
public class EurekaServer03Application {
        
        
  public static void main(String[] args) {
        
        
      SpringApplication.run(EurekaServer03Application.class, args);
  }
}
  • 配置项
    • demo/eureka-server-01/src/main/resources/application.yml
      server:
port: 8001

spring:
application:
name: eureka-server-01

eureka:
instance:
hostname: www.eureka-server-01.com
client:
register-with-eureka: false   # 是否将自己注册到 Eureka-Server 中，默认的为 true
fetch-registry: false         # 是否需要拉取服务信息，默认未true
service-url:
  defaultZone: http://www.eureka-server-02.com:8002/eureka/,http://www.eureka-server-03.com:8003/eureka/ # 注册中心地址
    • demo/eureka-server-02/src/main/resources/application.yml
      server:
  port: 8002

spring:
  application:
    name: eureka-server-02

eureka:
  instance:
    hostname: www.eureka-server-02.com
  client:
    register-with-eureka: false   # 是否将自己注册到 Eureka-Server 中，默认的为 true
    fetch-registry: false         # 是否需要拉取服务信息，默认未true
    service-url:
      defaultZone: http://www.eureka-server-01.com:8001/eureka/,http://www.eureka-server-03.com:8003/eureka/ # 注册中心地址
    • demo/eureka-server-03/src/main/resources/application.yml
      server:
  port: 8003

spring:
  application:
    name: eureka-server-03

eureka:
  instance:
    hostname: www.eureka-server-03.com
  client:
    register-with-eureka: false   # 是否将自己注册到 Eureka-Server 中，默认的为 true
    fetch-registry: false         # 是否需要拉取服务信息，默认未true
    service-url:
      defaultZone: http://www.eureka-server-01.com:8001/eureka/,http://www.eureka-server-02.com:8002/eureka/ # 注册中心地址

3、运行

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4、创建 Eureka Client 模块并注册到Eureka服务中

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  • 启动类
    • demo/eureka-client-01/src/main/java/com/example/demo/eurekaclient01/EurekaClient01Application.java
      package com.example.demo.eurekaclient01;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableEurekaClient
@SpringBootApplication
public class EurekaClient01Application {
        
        
    public static void main(String[] args) {
        
        
        SpringApplication.run(EurekaClient01Application.class, args);
    }
}
  • 配置项
    • demo/eureka-client-01/src/main/resources/application.yml
      server:
  port: 8081

spring:
  application:
    name: eureka-client-01

eureka:
  instance:
    hostname: www.eureka-client-01.com
    instance-id: eureka-client-01
  client:
    service-url:
      defaultZone: http://www.eureka-server-01.com:8001/eureka/,http://www.eureka-server-02.com:8002/eureka/,http://www.eureka-server-03.com:8003/eureka/

management:
  endpoints:
    web:
      exposure:
        include: "*"

5、运行

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6、项目目录结构

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网络请求获取数据

1、 创建项目

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demo/pom.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>
    <groupId>com.example.demo</groupId>
    <artifactId>demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <packaging>pom</packaging>

    <modules>
        <module>service-01</module>
        <module>service-02</module>
    </modules>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.6.13</spring-boot.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${spring-boot.version}</version>
                <executions>
                    <execution>
                        <id>repackage</id>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

demo/service-01/pom.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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <parent>
        <groupId>com.example.demo</groupId>
        <artifactId>demo</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>
    <artifactId>service-01</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>service-01</name>
    <description>service-01</description>
   
</project>

demo/service-02/pom.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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <parent>
        <groupId>com.example.demo</groupId>
        <artifactId>demo</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>
    <artifactId>service-02</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>service-02</name>
    <description>service-02</description>

</project>

demo/service-01/src/main/resources/application.yml

server:
  port: 8001

demo/service-02/src/main/resources/application.yml

server:
  port: 8002

2、 创建请求

demo/service-01/src/main/java/com/example/demo/service01/TestController.java

package com.example.demo.service01;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@RequestMapping
public class TestController {
    
    

    private final RestTemplate restTemplate = new RestTemplate();

    @GetMapping("msg")
    public String msg() {
    
    
        return "service-01 服务中请求 service-02";
    }

    @GetMapping("say")
    public String say() {
    
    
        String html = restTemplate.getForObject("https://www.example.com/", String.class);
        String msg = restTemplate.getForObject("http://127.0.0.1:8002/msg", String.class);
        return String.format("%s<h1 style=\"text-align: center;\">%s</h1>", html, msg);
    }

}

demo/service-01/src/main/java/com/example/demo/service01/TestController.java

package com.example.demo.service02;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@RequestMapping
public class TestController {
    
    

    private final RestTemplate restTemplate = new RestTemplate();

    @GetMapping("msg")
    public String msg() {
    
    
        return "service-02 服务中请求 service-01";
    }

    @GetMapping("say")
    public String say() {
    
    
        String html = restTemplate.getForObject("https://www.example.com/", String.class);
        String msg = restTemplate.getForObject("http://127.0.0.1:8001/msg", String.class);
        return String.format("%s<h1 style=\"text-align: center;\">%s</h1>", html, msg);
    }

}

3、 运行

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4、 目录结构

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利用Eureka实现服务间数据请求

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1、 创建项目

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demo/pom.xml

<packaging>pom</packaging>

<modules>
    <module>eureka-server</module>
    <module>service-01</module>
    <module>service-02</module>
</modules>

2、 添加依赖

demo/pom.xml

<!-- 用于服务间请求的依赖 -->
<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-openfeign -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

3、 demo/eureka-server

demo/eureka-server/src/main/resources/application.yml

server:
  port: 8001

spring:
  application:
    name: eureka-server

eureka:
  instance:
    hostname: www.eureka-server.com
  client:
    register-with-eureka: false   # 是否将自己注册到 Eureka-Server 中，默认的为 true
    fetch-registry: false         # 是否需要拉取服务信息，默认未true
    service-url:
      defaultZone: http://${
    
    eureka.instance.hostname}:${
    
    server.port}/eureka/ # 注册中心地址

demo/eureka-server/src/main/java/com/example/demo/eurekaserver/EurekaServerApplication.java

package com.example.demo.eurekaserver;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {
    
    

    public static void main(String[] args) {
    
    
        SpringApplication.run(EurekaServerApplication.class, args);
    }

}

4、 demo/service-01

demo/service-01/src/main/resources/application.yml

server:
  port: 8081

spring:
  application:
    name: service-01

eureka:
  instance:
    hostname: www.eureka-server.com
    instance-id: service-01
  client:
    service-url:
      defaultZone: http://www.eureka-server.com:8001/eureka/

management:
  endpoints:
    web:
      exposure:
        include: "*"

demo/service-01/src/main/java/com/example/demo/service01/Service01Application.java

package com.example.demo.service01;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class Service01Application {
    
    

    public static void main(String[] args) {
    
    
        SpringApplication.run(Service01Application.class, args);
    }

}

demo/service-01/src/main/java/com/example/demo/service01/api/IService02.java

package com.example.demo.service01.api;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;

@FeignClient(value = "SERVICE-02")
public interface IService02 {
    
    
    @GetMapping("/getMsg")
    public String getMsg();
}

demo/service-01/src/main/java/com/example/demo/service01/Service01Controller.java

package com.example.demo.service01;

import com.example.demo.service01.api.IService02;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
@RequestMapping
public class Service01Controller {
    
    

    @Resource
    private IService02 service02;

    @GetMapping("/say")
    public String say(){
    
    
        return service02.getMsg();
    }

    @GetMapping("getMsg")
    public String getMsg() {
    
    
        return "SERVICE-02 调用 SERVICE-01";
    }

}

5、 demo/service-02

demo/service-02/src/main/resources/application.yml

server:
  port: 8082

spring:
  application:
    name: service-02

eureka:
  instance:
    hostname: www.eureka-server.com
    instance-id: service-02
  client:
    service-url:
      defaultZone: http://www.eureka-server.com:8001/eureka/

management:
  endpoints:
    web:
      exposure:
        include: "*"

demo/service-02/src/main/java/com/example/demo/service02/Service02Application.java

package com.example.demo.service02;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class Service02Application {
    
    

    public static void main(String[] args) {
    
    
        SpringApplication.run(Service02Application.class, args);
    }

}

demo/service-02/src/main/java/com/example/demo/service02/api/IService01.java

package com.example.demo.service02.api;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;

@FeignClient(value = "SERVICE-01")
public interface IService01 {
    
    
    @GetMapping("/getMsg")
    public String getMsg();
}

demo/service-02/src/main/java/com/example/demo/service02/Service02Controller.java

package com.example.demo.service02;

import com.example.demo.service02.api.IService01;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
@RequestMapping
public class Service02Controller {
    
    

    @Resource
    private IService01 service01;

    @GetMapping("/say")
    public String say(){
    
    
        return service01.getMsg();
    }

    @GetMapping("getMsg")
    public String getMsg() {
    
    
        return "SERVICE-01 调用 SERVICE-02";
    }

}

6、 运行

优先运行 EurekaServerApplication 启动类

在这里插入图片描述

7、 目录结构

在这里插入图片描述

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