目录结构

  • 项目最后的结构:
  • 服务说明
  • springcloud-server:
  • springcloud-provider:
  • springcloud-invoker:
  • 首先创建一个空的maven项目:
  • 创建springcloud-server模块
  • 创建springcloud-provider模块
  • 创建springcloud-invoker模块
  • 使用RestTemplate实现远程调用


项目最后的结构:

springcloud vscode_springcloud

服务说明
springcloud-server:
Eureka服务,类似于一个zookpeer的注册中心,起到服务发现的作用
springcloud-provider:
接口提供者,通过远程调用在invoker服务中调用该项目中的接口
springcloud-invoker:
服务调用者,可以远程调用provider提供的接口
首先创建一个空的maven项目:

选择maven→选择SDK版本→点击next(记住不能选择crete from archeyype

springcloud vscode_springcloud_02

输入项目名称→选择项目路径→点击完成

springcloud vscode_helloworld_03

创建springcloud-server模块

在空的maven项目上→右键→new→modul

springcloud vscode_spring_04


选择spring initializr→输入项目名→输入group→输入artiface→点击next

springcloud vscode_springcloud_05


选择web-spring web →选择 spring cloud discover - Eureka Server→点击finish完成

springcloud vscode_springcloud_06


等待下载依赖,pom文件内容如下(无需修改,选择好的会自动配置):

<?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>2.4.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>springcloud-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springcloud-server</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
        <spring-cloud.version>2020.0.2</spring-cloud.version>
    </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-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>

修改配置文件,增加如下内容:(需要在application.properties文件同目录下创建一个applicaiton.yaml文件即可)

server:
  port: 8761


eureka:
  instance:
    hostname: localhost
    lease-renewal-interval-in-seconds: 5  # 设置心跳的时间间隔(默认是30秒)
    lease-expiration-duration-in-seconds: 20 # 如果现在超过了20秒的间隔(默认是90秒)则服务无效了
  client:
    registerWithEureka: false
    fetchRegistry: false
    service-url:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka
  server:
    waitTimeInMsWhenSyncEmpty: 0
    eviction-interval-timer-in-ms: 30000  # eureka清理无效服务的间隔时间
    enable-self-preservation: false  # 设置为false表示关闭保护模式--某一个微服务不可用了,eureka清理掉

在启动类增加Eureka启动配置:@EnableEurekaServer

springcloud vscode_ci_07


启动服务,页面访问http://localhost:8761 ,可以看到Eureka服务页面,当前没有服务加入进来,下面的Application部分没有结果

springcloud vscode_springcloud vscode_08

创建springcloud-provider模块

重复创建springcloud-server前面的步骤,直到选择依赖部分

选择web - spring web → 选择Spring Cloud Discovery - Eureka Discovery Client

springcloud vscode_springcloud_09


等待下载依赖,pom文件内容如下(无需修改,选择好的会自动配置):

<?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>2.4.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.iking</groupId>
    <artifactId>springcloud-provider</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springcloud-provider</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
        <spring-cloud.version>2020.0.2</spring-cloud.version>
    </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>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>

application.yaml文件添加配置信息:

server:
  port: 8501

spring:
  application:
    name: service-provider

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/  # eureka server 设置的地址

启动类添加@EnableEurekaClient注解

注意:此处是client,上面server对应的是server

springcloud vscode_springcloud vscode_10


编写测试接口

创建controller.TestController.java 插入下面的代码:

@RestController
public class TestController {

    @RequestMapping(value = "/person/{name}",method = RequestMethod.GET)
    public String findName(@PathVariable("name") String name){
        System.out.println("============:"+name);
        return name;
    }

    @RequestMapping("/")
    public String home(){
        return "hello world --- springcloud-provider";
    }
}

项目结构如下:

springcloud vscode_helloworld_11


启动项目,访问localhost:8501,localhost:8501/person/test可以正常获取到接口信息

springcloud vscode_ci_12


springcloud vscode_springcloud_13


访问http://localhost:8761/ 可以看到,服务已经加入进来了

springcloud vscode_springcloud vscode_14

创建springcloud-invoker模块

重复创建springcloud-provider模块部分步骤,直到项目创建完成
等待下载依赖,pom文件内容如下(无需修改,选择好的会自动配置):

<?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>2.4.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.iking</groupId>
    <artifactId>springcloud-invoker</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springcloud-invoker</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
        <spring-cloud.version>2020.0.2</spring-cloud.version>
    </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>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>

在application.yaml中修改配置信息:

server:
  port: 8502

spring:
  application:
    name: service-invoker

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

启动类添加@EnableEurekaClient注解

注意:此处是client,上面server对应的是server

springcloud vscode_springcloud_15

使用RestTemplate实现远程调用

编写测试接口,通过RestTemplate实现远程调用,只是一开始提供的方式,开发基本不会用这种方式,只是用来实现测试,完成demo。
新建controller.InvokerController.java,代码内容如下:

@RestController
@Configuration
public class InvokerController {

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

    @RequestMapping(value = "/router",method = RequestMethod.GET)
    public String router(){
        RestTemplate restTemplate = getRestTemplate();
        String name = restTemplate.getForObject("http://service-provider/person/chonor",String.class);
        return name;
    }
}

项目结构如下:

springcloud vscode_springcloud_16


启动项目,可以在Eureka看到对应服务

springcloud vscode_ci_17


访问http://localhost:8502/router 实现远程调用springcloud-provider下的接口

springcloud vscode_springcloud_18