服务提供

假设我们现在有个需求,需要一个接口,当我们传入一个名字,它会返回一句问好的话.如传入body,输入则为hello body!.

创建一个spring cloud的工程项目

具体的步骤这里就不在详细介绍了,需要的可以看[spring cloud微服务实践二]里面的内容.
步骤如下:

Idea中选择之前的目录firstCloud, 右击>New>Module, 选择 Spring Initialzr.
工程中 Group
Project Metadata中Group为com.xingyys, Artifact为producer
直接next,直到完成.

pom 配置

在producer目录下,修改 pom.xml文件,添加依赖:

<?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 http://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>2.1.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.xingyys</groupId>
    <artifactId>producer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>producer</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR2</spring-cloud.version>
    </properties>

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

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

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

</project>

配置文件

修改 resources下的配置文件 application.properties.

spring.application.name=producer

server.port=9000

eureka.client.service-url.defaultZone=http://localhost:8000/eureka/

启动类

修改com.xingyys.producer下的 ProducerApplication.java:

@SpringBootApplication
@EnableDiscoveryClient
public class ProducerApplication {

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

}

有了@EnableDiscoveryClient,就表示producer具有注册服务的功能了.

添加Controller

这里添加一个controller提供我们需要的服务 com.xingyys.producer/controller/HelloController.java:

@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String hello(@RequestParam String name) {
        return "Hello " + name + " !";
    }
}

编译运行

producer代码和配置文件这样就可以了,接下来运行producer看看效果:

cd producer

 mvn clean package -Dmaven.test.skip=true

 java -jar target/producer-0.0.1-SNAPSHOT.jar

访问http://localhost:9000/hello?name=xingyys,返回Hello xingyys !,表示注册成功,producer可以提供服务了.

spring cloud微服务实践二