springcloud(四)：第一个Ribbon程序

1. Ribbon

负载均衡框架，支持可插拔式的负载均衡规则

支持多种协议，如HTTP、UDP等

提供负载均衡客户端

1.1 负载均衡器组件

一个负载均衡器，至少提供以下功能：

• 要维护各个服务器的IP等信息
• 根据特定逻辑选取服务器

为了实现基本的负载均衡功能，Ribbon的负载均衡器有三大子模块：

• Rule
• Ping
• ServerList

1.2 实现程序

创建项目：ribbon-service

pom.

<project  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 <modelVersion>4.0.0</modelVersion> <groupId>org.crazyit.cloud</groupId> <artifactId>ribbon-service</artifactId> <version>0.0.1-SNAPSHOT</version>  <dependencies>  <dependency>   <groupId>org.springframework.boot</groupId>   <artifactId>spring-boot-starter-web</artifactId>   <version>1.5.7.RELEASE</version>  </dependency> </dependencies> </project>

Person：

package org.crazyit.cloud;public class Person { private Integer id; private String name; private String message; public Integer getId() {  return id; } public void setId(Integer id) {  this.id = id; } public String getName() {  return name; } public void setName(String name) {  this.name = name; } public String getMessage() {  return message; } public void setMessage(String message) {  this.message = message; } }

MyController：

package org.crazyit.cloud;import javax.servlet.http.HttpServletRequest;import org.springframework.http.MediaType;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class MyController { @RequestMapping(value = "/person", method = RequestMethod.GET,    produces = MediaType.APPLICATION_JSON_VALUE) public Person getPerson(HttpServletRequest request) {  Person p = new Person();  p.setId(1);  p.setName("angus");  p.setMessage(request.getRequestURL().toString());  return p; }}

ServiceApp：

package org.crazyit.cloud;import java.util.Scanner;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.builder.SpringApplicationBuilder;@SpringBootApplicationpublic class ServiceApp { public static void main(String[] args) throws Exception {  Scanner scan = new Scanner(System.in);  String port = scan.nextLine();  new SpringApplicationBuilder(ServiceApp.class).properties(    "server.port=" + port).run(args); }}

启动两个服务：控制台输入8080和8081：

 

 

然后创建一个客户端ribbon-client项目：

pom：

<project  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 <modelVersion>4.0.0</modelVersion> <groupId>org.crazyit.cloud</groupId> <artifactId>ribbon-client</artifactId> <version>0.0.1-SNAPSHOT</version> <dependencies>  <dependency>   <groupId>com.netflix.ribbon</groupId>   <artifactId>ribbon-core</artifactId>   <version>2.2.2</version>  </dependency>  <dependency>   <groupId>com.netflix.ribbon</groupId>   <artifactId>ribbon-httpclient</artifactId>   <version>2.2.2</version>  </dependency> </dependencies></project>

TestRibbon：

package org.crazyit.cloud;import com.netflix.client.ClientFactory;import com.netflix.client.http.HttpRequest;import com.netflix.client.http.HttpResponse;import com.netflix.config.ConfigurationManager;import com.netflix.niws.client.http.RestClient;public class TestRibbon { public static void main(String[] args) throws Exception {  ConfigurationManager.getConfigInstance().setProperty(     "my-client.ribbon.listOfServers", "localhost:8080,localhost:8081");  RestClient client = (RestClient) ClientFactory.getNamedClient("my-client");  HttpRequest request = HttpRequest.newBuilder().uri("/person").build();  for(int i = 0; i < 10; i++) {   HttpResponse response = client.executeWithLoadBalancer(request);   String json = response.getEntity(String.class);   System.out.println(json);  } }}

然后运行：

 实现了负载均衡了。

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1.Ribbon负载均衡框架，支持可插拔式的负载均衡规则支持多种协议，如HTTP、UDP等提供负载均衡客户端1.1负载均衡器组件一个负载均衡器，至少提供以下功能：要维护各个服务器的IP等信息根据特定逻辑选取服务器为了实现基本的负载均衡功能，Ribbon的负载均衡器有三大子模块：RulePingServerList1.2实现程序创建项目：ribbon-servicepom.<projectxs
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