<?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"> 
    <parent> 
        <artifactId>spring_cloud</artifactId> 
        <groupId>org.example</groupId> 
        <version>1.0-SNAPSHOT</version> 
    </parent> 
    <modelVersion>4.0.0</modelVersion> 
    <artifactId>remote_call</artifactId> 
    <packaging>pom</packaging> 
    <modules> 
        <module>server_a</module> 
    </modules> 
    <properties> 
        <maven.compiler.source>17</maven.compiler.source> 
        <maven.compiler.target>17</maven.compiler.target> 
    </properties> 
</project>

<?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>org.example</groupId> 
    <artifactId>spring_cloud</artifactId> 
    <packaging>pom</packaging> 
    <version>1.0-SNAPSHOT</version> 
    <modules> 
        <module>product</module> 
        <module>eureka</module> 
        <module>order</module> 
        <module>remote_call</module> 
    </modules> 
    <!--    管理版本統(tǒng)一管理和spring相關(guān)的依賴-->
    <parent> 
        <artifactId>spring-boot-starter-parent</artifactId> 
        <groupId>org.springframework.boot</groupId> 
        <version>2.6.7</version> 
    </parent> 
    <properties> 
        <maven.compiler.source>17</maven.compiler.source> 
        <maven.compiler.target>17</maven.compiler.target> 
    </properties> 
    <dependencies> 
        <dependency> 
            <groupId>org.springframework.boot</groupId> 
            <artifactId>spring-boot-starter-web</artifactId> 
        </dependency> 
        <dependency> 
            <groupId>org.springframework.boot</groupId> 
            <artifactId>spring-boot-starter-logging</artifactId> 
        </dependency> 
        <dependency> 
            <groupId>org.springframework.boot</groupId> 
            <artifactId>spring-boot-starter-test</artifactId> 
        </dependency> 
        <dependency> 
            <groupId>org.projectlombok</groupId> 
            <artifactId>lombok</artifactId> 
            <version>1.18.24</version> 
            <scope>provided</scope> 
        </dependency> 
    </dependencies> 
    <dependencyManagement> 
        <dependencies> 
            <dependency> 
                <groupId>org.springframework.cloud</groupId> 
                <artifactId>spring-cloud-dependencies</artifactId> 
                <version>2021.0.3</version> 
                <type>pom</type> 
                <scope>import</scope> 
            </dependency> 
        </dependencies> 
    </dependencyManagement> 
    <repositories> 
        <repository> 
            <id>spring-snapshots</id> 
            <name>Spring Snapshots</name> 
            <url>http://repo.spring.io/libs-snapshot-local</url> 
            <snapshots> 
                <enabled>true</enabled> 
            </snapshots> 
        </repository> 
        <repository> 
            <id>spring-milestones</id> 
            <name>Spring Milestones</name> 
            <url>http://repo.spring.io/libs-milestone-local</url> 
            <snapshots> 
                <enabled>false</enabled> 
            </snapshots> 
        </repository> 
        <repository> 
            <id>spring-releases</id> 
            <name>Spring Releases</name> 
            <url>http://repo.spring.io/libs-release-local</url> 
            <snapshots> 
                <enabled>false</enabled> 
            </snapshots> 
        </repository> 
    </repositories> 
    <pluginRepositories> 
        <pluginRepository> 
            <id>spring-snapshots</id> 
            <name>Spring Snapshots</name> 
            <url>http://repo.spring.io/libs-snapshot-local</url> 
            <snapshots> 
                <enabled>true</enabled> 
            </snapshots> 
        </pluginRepository> 
        <pluginRepository> 
            <id>spring-milestones</id> 
            <name>Spring Milestones</name> 
            <url>http://repo.spring.io/libs-milestone-local</url> 
            <snapshots> 
                <enabled>false</enabled> 
            </snapshots> 
        </pluginRepository> 
    </pluginRepositories> 
    <build> 
        <plugins> 
            <plugin> 
                <groupId>org.springframework.boot</groupId> 
                <artifactId>spring-boot-maven-plugin</artifactId> 
            </plugin> 
        </plugins> 
    </build> 
</project>

<?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"> 
    <parent> 
        <artifactId>remote_call</artifactId> 
        <groupId>org.example</groupId> 
        <version>1.0-SNAPSHOT</version> 
    </parent> 
    <modelVersion>4.0.0</modelVersion> 
    <artifactId>server_a</artifactId> 
    <properties> 
        <maven.compiler.source>17</maven.compiler.source> 
        <maven.compiler.target>17</maven.compiler.target> 
    </properties> 
</project>

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class server_a_ApplicationStarter {
    public static void main(String[] args) {
        SpringApplication.run(server_a_ApplicationStarter.class,args);
    }
}

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("server_a")
public class controller {
    @RequestMapping(value = "sendMessageToServerB",method = RequestMethod.GET)
    @ResponseBody
    public String sendMessage(){
        return "hello,server_b! i am server_a";
    }
}

<?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"> 
    <parent> 
        <artifactId>remote_call</artifactId> 
        <groupId>org.example</groupId> 
        <version>1.0-SNAPSHOT</version> 
    </parent> 
    <modelVersion>4.0.0</modelVersion> 
    <artifactId>server_b</artifactId> 
    <properties> 
        <maven.compiler.source>17</maven.compiler.source> 
        <maven.compiler.target>17</maven.compiler.target> 
    </properties> 
</project>

@SpringBootApplication
public class server_b_ApplicationStarter {
    @Bean
    public RestTemplate RestTemplate(){
        return new RestTemplate();
    }
    public static void main(String[] args) {
        SpringApplication.run(server_b_ApplicationStarter.class,args);
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
@RestController
@RequestMapping("server_b")
public class controller {
    @Autowired
    private RestTemplate restTemplate;
    @RequestMapping(value = "remote_server_a",method = RequestMethod.GET)
    public String remoteCallServerA(){
        return restTemplate.getForObject("http://127.0.0.1:9001/server_a/sendMessageToServerB",String.class);
    }
}

restTemplate.getForObject("http://127.0.0.1:9001/server_a/sendMessageToServerB",String.class);