SpringBoot2 整合 SpringCloud Ribbon 實現負載均衡實例

文章目錄

2.3 註冊的服務

3. 使用Ribbon 調用服務

1. 簡介

Spring Cloud Ribbon 是一個基於 Http 和 TCP 的客服端負載均衡工具，它是基於 Netflix Ribbon 實現的。

客戶端負載均衡即是當瀏覽器向後臺發出請求的時候，客戶端會向 Eureka Server 讀取註冊到服務器的可用服務信息列表，然後根據設定的負載均衡策略（沒有設置即用默認的），抉擇出向哪臺服務器發送請求。

2. 實例

2.1 註冊中心

工程名：eurekaserver
工程目錄如下所示：

依賴

<?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>2.1.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.syrdbt</groupId>
    <artifactId>eurekaserver</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>eurekaserver</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.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 application.properties

# 服務註冊中心端口號
server.port=8761
# 服務註冊中心主機名
eureka.instance.hostname=127.0.0.1
# 不向註冊中心註冊自己
eureka.client.register-with-eureka=false
# 不需要檢索服務
eureka.client.fetch-registry=false
# 註冊中心地址，會自動填充 主機名 和 端口號
eureka.client.service-url.defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

啓動類：

package com.syrdbt.eurekaserver;

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

@SpringBootApplication
@EnableEurekaServer
public class EurekaserverApplication {

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

}

2.2 兩個提供服務的工程

兩個提供服務的應用名稱相同。

2.2.1 工程一 eurekaclient

工程目錄：
依賴

<?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>2.1.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.syrdbt</groupId>
    <artifactId>eurekaclient</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>eurekaclient</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-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>

配置文件：

eureka:
  client:
    serviceUrl:
      #註冊中心的地址
      defaultZone: http://localhost:8761/eureka/
server:
  #當前服務端口號
  port: 8762
spring:
  application:
    #當前應用名稱,當前應用的名稱
    name: service-hi

Controller 類：

package com.syrdbt.eurekaclient.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

/**
 * @date 2019-10-12
 */
@RestController
public class HelloController {
    @Autowired
    private DiscoveryClient client;
    @RequestMapping(value = "hello", method = RequestMethod.GET)
    public String index() {
        return "eurekaClient：Hello World";
    }
}

啓動類

@SpringBootApplication
@EnableEurekaClient
package com.syrdbt.eurekaclient;

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

@SpringBootApplication
@EnableEurekaClient
public class EurekaclientApplication {

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

}

2.1.1 工程二 eurekaclient01

工程目錄
依賴

<?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>2.1.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.syrdbt</groupId>
    <artifactId>eurekaclient01</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>eurekaclient01</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-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>

配置

eureka:
  client:
    serviceUrl:
      #註冊中心的地址
      defaultZone: http://localhost:8761/eureka/
server:
  #當前服務端口號
  port: 8763
spring:
  application:
    #當前應用名稱,當前應用的名稱
    name: service-hi

控制器

package com.syrdbt.eurekaclient01.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

/**
 * @date 2019-10-12
 */
@RestController
public class HelloController {
    @Autowired
    private DiscoveryClient client;

    @RequestMapping(value = "hello", method = RequestMethod.GET)
    public String index() {
        return "eurekaClient01：Hello World";
    }
}

啓動類

package com.syrdbt.eurekaclient01;

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

@SpringBootApplication
@EnableEurekaClient
public class Eurekaclient01Application {

    public static void main(String[] args) {
        SpringApplication.run(Eurekaclient01Application.class, args);
    }

}

2.3 註冊的服務

如下圖所示：

3. 使用Ribbon 調用服務

創建工程 eurekaclient02 。
工程目錄如下所示：

3.1 配置和源碼

依賴

<?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>2.1.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.syrdbt</groupId>
    <artifactId>eurekaclient02</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>eurekaclient02</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.cloud</groupId>
            <artifactId>spring-cloud-starter-config</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-web</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

spring:
  application:
    name: app-consumer
server:
  # 自己的端口號
  port: 8764
eureka:
  client:
    service-url:
      # 註冊中心地址
      defaultZone: http://localhost:8761/eureka/
    register-with-eureka: true
    fetch-registry: true

啓動類

package com.syrdbt.eurekaclient02;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@EnableEurekaClient
public class Eurekaclient02Application {

    public static void main(String[] args) {
        SpringApplication.run(Eurekaclient02Application.class, args);
    }

    @Bean
    // 讓RestTemplate在請求時擁有客戶端負載均衡的能力
    @LoadBalanced
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

}

控制器

package com.syrdbt.eurekaclient02.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

/**
 * @date 2019-10-12
 */
@RestController
public class VisitHelloController {

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping("/hello")
    public String getOrder() {
        String memberUrl = "http://service-hi/hello";
        String result = restTemplate.getForObject(memberUrl, String.class);
        System.out.println("訪問結果" + result);
        return result;
    }
}

3.2 調用結果

訪問：http://localhost:8764/hello

回到頂部

SpringBoot2 整合 SpringCloud Ribbon 實現負載均衡實例

文章目錄

1. 簡介

2. 實例

2.1 註冊中心

2.2 兩個提供服務的工程

2.2.1 工程一 eurekaclient

2.1.1 工程二 eurekaclient01

2.3 註冊的服務

3. 使用Ribbon 調用服務

3.1 配置和源碼

3.2 調用結果

SpringBoot2 整合 SpringCloud Ribbon 實現負載均衡實例

Postman 發送 Json 類型請求

Java8 HashMap 源碼閱讀

SpringBoot2 整合 SpringCloud 的 Gateway 入門實例

Java8 HashSet 源碼閱讀

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