服务器之家：专注于VPS、云服务器配置技术及软件下载分享
分类导航

PHP教程|ASP.NET教程|Java教程|ASP教程|编程技术|正则表达式|C/C++|IOS|C#|Swift|Android|VB|R语言|JavaScript|易语言|vb.net|

服务器之家 - 编程语言 - Java教程 - 如何使用Resttemplate和Ribbon调用Eureka实现负载均衡

如何使用Resttemplate和Ribbon调用Eureka实现负载均衡

2022-10-25 15:03追月亮的猴子 Java教程

这篇文章主要介绍了如何使用Resttemplate和Ribbon调用Eureka实现负载均衡，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教

1.服务注册和发现Eureka

可以用作服务治理。

2.首先我们建立一个父子工程

最外层是forezp

其下面建立四个子工程

  • eureka-server
  • eureka-client
  • eureka-client1
  • eureka-ribbon-client

3.forezp工程相关

1.forezp pom文件如下

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
<?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>2.1.5.RELEASE</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.example</groupId>
   <artifactId>forezp</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>forezp</name>
   <description>Demo project for Spring Boot</description> 
 
   <properties>
      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
      <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
      <java.version>1.8</java.version>
      <spring-cloud.version>Dalston.SR1</spring-cloud.version>
   </properties> 
 
   <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> 
 
   <modules>
      <module>euraka-client</module>
      <module>euraka-server</module>
      <module>eureka-ribbon-client</module>
      <module>euraka-client2</module>
   </modules> 
 
   <!--<build>-->
      <!--<plugins>-->
         <!--<plugin>-->
            <!--<groupId>org.springframework.boot</groupId>-->
            <!--<artifactId>spring-boot-maven-plugin</artifactId>-->
         <!--</plugin>-->
      <!--</plugins>-->
   <!--</build>-->
 
</project>

4.Eureka的服务中心:eureka-server相关

1.pom文件

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
<?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>com.example</groupId>
      <artifactId>forezp</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.example</groupId>
   <artifactId>euraka-server</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>euraka-server</name>
   <description>Demo project for Spring Boot</description> 
 
   <properties>
      <java.version>1.8</java.version>
      <spring-cloud.version>Greenwich.SR1</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>

2.application.properties文件

?
1
2
3
4
5
6
7
8
server.port=8761 
eureka.instance.hostname=localhost
 
#防止自己注册自己
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
#eureka的注册地址
eureka.client.service-url.default-zone=http://${eureka.instance.hostname}:${server.port}/eureka/}

3.需要在启动类添加 @EnableEurekaServer 注解来开启注册服务

?
1
2
3
4
5
6
7
8
9
10
11
12
package com.example.eurakaserver;  
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; 
 
@SpringBootApplication
@EnableEurekaServer
public class EurakaServerApplication {  
   public static void main(String[] args) {
      SpringApplication.run(EurakaServerApplication.class, args);
   }  
}

5.eureka-client和eureka-client1用来提供服务

这两个子工程其实区别不大，只是为了验证实现负载均衡。

1.pom文件

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
<?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>com.example</groupId>
        <artifactId>forezp</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>euraka-client2</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>euraka-client2</name>
    <description>Demo project for Spring Boot</description>
 
    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR1</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.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </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>

2.新建一个ApiController类

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
package com.example.eurakaclient2;  
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController; 
 
@RestController
public class ApiController { 
 
    @Value("${server.port}")
    String port;
    @GetMapping("/hi")
    public String home(@RequestParam String name1){
        return "hi "+name1+"i am a port:"+port;
    }
}

3.eureka-client 的 apllication.properties配置如下

?
1
2
3
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/
server.port=8762
spring.application.name=eureka-client

4.eureka-client2的 apllication.properties配置如下

?
1
2
3
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/
server.port=8763
spring.application.name=eureka-client

5.需要在启动类添加注解 @EnableEurekaClient，开启服务提供

?
1
2
3
4
5
6
7
8
9
10
11
12
package com.example.eurakaclient2;  
import org.springframework.boot.SpringApplication;
      import org.springframework.boot.autoconfigure.SpringBootApplication;
      import org.springframework.cloud.netflix.eureka.EnableEurekaClient; 
 
@SpringBootApplication
@EnableEurekaClient
public class EurakaClient2Application {  
   public static void main(String[] args) {
      SpringApplication.run(EurakaClient2Application.class, args);
   } 
}

6.eureka-ribbon-client工程相关

1.pom文件

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
<?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>com.example</groupId>
      <artifactId>forezp</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.example</groupId>
   <artifactId>eureka-ribbon-client</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>eureka-ribbon-client</name>
   <description>Demo project for Spring Boot</description> 
 
   <properties>
      <java.version>1.8</java.version>
      <spring-cloud.version>Greenwich.SR1</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-ribbon</artifactId>
      </dependency> 
 
      <dependency>
         <groupId>org.springframework.cloud</groupId>
         <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
      </dependency> 
 
      <dependency>
         <groupId>org.projectlombok</groupId>
         <artifactId>lombok</artifactId>
         <optional>true</optional>
      </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>

2.applicaiton.properties配置文件如下

?
1
2
3
spring.application.name=eureka-ribbon-client
server.port=8764
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/

3.新建RibbonConfig类，在这里注入RestTemplate类同时开启负载均衡

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
package com.example.eurekaribbonclient;  
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate; 
 
@Configuration
public class RibbonConfig { 
 
    @Bean
    @LoadBalanced
    RestTemplate restTemplate(){
        return new RestTemplate();
    }
}

4.新建service层，调用eureka-client （eureka-client1）提供的restful接口，其中 eureka-client 为  eureka-client （eureka-client1）注册在 eureka-service上的serviceId信息，如果没有配置serviceId,默认使用spring.application.name

?
1
2
3
4
5
6
7
8
9
10
11
12
13
package com.example.eurekaribbonclient;  
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;  
 
    @Service
    public class RibbonService {
        @Autowired
    RestTemplate restTemplate;
    public String hi(String name){  
        return restTemplate.getForObject("http://eureka-client/hi?name1="+name,String.class);
    }
}

5.新建controller层，调用RibbonService为我们提供的方法

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
package com.example.eurekaribbonclient;  
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController; 
 
@RestController
public class RibbonController {
    @Autowired
    RibbonService ribbonService; 
 
    @GetMapping("/hi")
    public String hi(@RequestParam(required = false,defaultValue = "forezp")String name){
        return ribbonService.hi(name);
    }
}

6.同时也需要在启动类添加@EnableEurekaClient注解

?
1
2
3
4
5
6
7
8
9
10
11
12
13
package com.example.eurekaribbonclient;  
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient; 
 
@SpringBootApplication
@EnableEurekaClient
public class EurekaRibbonClientApplication { 
 
   public static void main(String[] args) {
      SpringApplication.run(EurekaRibbonClientApplication.class, args);
   }  
}

7.验证

1.按照顺序启动工程

2.浏览器访问  http://localhost:8761/

可以看到EUREKA-CLIENT 和 EUREKA-RIBBON-CLIENT已经注册进来了 

如何使用Resttemplate和Ribbon调用Eureka实现负载均衡

3.我们访问 http://localhost:8764/hi?name=forezp 两次

可以看到  页面分别返回

hi forezpi am a port:8762

hi forezpi am a port:8763

这样验证了我们实现了负载均衡。

以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。

原文链接：https://blog.csdn.net/qq_27707957/article/details/91348601

  • 负载均衡
  • Eureka
  • Ribbon
  • RestTemplate

    • 延伸 · 阅读

    精彩推荐
    最近更新
    编辑推荐
    阅读排行
    热门标签
    501 　 406 　 415 　 2000 　 1433 　 401 　 330 　 204 　 选择排序法 　 随机抽取 　 内存卡 　 下载器 　 十六进制字符 　 响应 　 静态工厂 　 构造函数 　 swt 　 Overview 　 对象池模式 　 springkafka 　 支票 　 金额大写转换 　 空心菱形 　 AspectJ 　 面向切面编程 　 方法名 　 网址信息 　 动态代理模式 　 线程安全 　 htmlparser 　
    © 2019-2022 服务器之家(www.tuohang.net) 版权所有关于我们联系我们版权申明网站地图