Spring cloud配置Ribbon用于负载君和，如果要在细节上配置更多，那么需要阅读一下官方文档。
* RoundRobinRule:轮询
* RandomRule:随机
* AvailabilityFilteringRule: 会先过滤掉由于多次访问故障而处于断路器跳闸状态的服务,以及并发的连接数量
* 超过阈值的服务,然后对剩余的服务列表按照轮询策略进行访问;
* WeightedResponseTimeRule: 根据平均响应时间计算所有服务的权重,响应时间越快,服务权重越大,被选中的机率越高;
* 刚启动时,如果统计信息不足,则使用RoundRobinRule策略,等统计信息足够时,会切换到WeightedResponseTimeRule
* RetryRule: 先按照RoundRobinRule的策略获取服务,如果获取服务失败,则在指定时间内会进行重试,获取可用的服务;
* BestAvailableRule: 会先过滤掉由于多次访问故障而处于断路器跳闸状态的服务,然后选择一个并发量最小的服务;
* ZoneAvoidanceRule: 默认规则,复合判断server所在区域的性能和server的可用性选择服务器;
首先maven文件：
<?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>2.2.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.test</groupId>
<artifactId>router</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>router</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Hoxton.M3</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</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</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>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
</repository>
</repositories>
</project>
配置文件：
server:
address: 127.0.0.1
port: 7001
undertow:
io-threads: 19 # 设置IO线程数, 它主要执行非阻塞的任务,它们会负责多个连接, 默认设置每个CPU核心一个线程
worker-threads: 24 # 阻塞任务线程池, 当执行类似servlet请求阻塞操作, undertow会从这个线程池中取得线程,它的值设置取决于系统的负载
buffer-size: 1024 # 以下的配置会影响buffer,这些buffer会用于服务器连接的IO操作,有点类似netty的池化内存管理
direct-buffers: true # 是否分配的直接内存
always-set-keep-alive: true #socket-binding="http"，保持长连接
spring:
application:
name: router-server
profiles:
active: test
cloud:
loadbalancer:
retry:
enabled: true #重试机制开启为true，关闭为false
eureka:
instance:
appname: router-server
virtual-host-name: router-server
secure-virtual-host-name: router-server
instance-id: ${server.address}:router-server-peer:${server.port}
hostname: localhost
# non-secure-port: 6001 #非安全通信端口
# non-secure-port-enabled: true #是否启用非安全端口接受请求
# secure-port: 6444 #安全通信端口
# secure-port-enabled: true #是否启用安全端口接受请求
prefer-ip-address: false #是否优先使用IP地址作为主机名的标识，默认false
lease-renewal-interval-in-seconds: 30 #eureka节点定时续约时间，默认30
lease-expiration-duration-in-seconds: 90 #eureka节点剔除时间，默认90
client:
register-with-eureka: true #将自己注册到eureka注册中心，单节点关闭
fetch-registry: true #从注册中心获取注册信息，单节点关闭
registry-fetch-interval-seconds: 30 #从注册中心获取注册信息的时间间隔
eureka-server-connect-timeout-seconds: 15
eureka-server-read-timeout-seconds: 10
service-url:
defaultZone: http://${eureka.instance.hostname}:7000/eureka/ #注册到另外两个节点，实现集群
ribbon:
eureka:
enabled: true
注解开启服务：
@EnableEurekaClient
@SpringBootApplication
public class RouterApplication {
public static void main(String[] args) {
SpringApplication.run(RouterApplication.class, args);
}
}
写一个RestTemplate服务层，用于公共接口转发：
package com.test.router.system.service;
import com.test.router.system.core.BaseService;
import com.test.router.system.core.ResultResp;
import com.test.router.system.service.resources.IAPIDispatcherService;
import org.springframework.http.*;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
import java.util.Map;
@Service
public class APIDispatcherServiceImpl extends BaseService implements IAPIDispatcherService {
@Resource
private RestTemplate restTemplate;
@Override
public ResultResp<Map<String, Object>> getForObject(String name, Object... uriVariables) {
return restTemplate.getForObject("http://api-server/" + name, ResultResp.class);
}
@Override
public ResultResp<Map<String, Object>> postForObject(String name, Map<String, Object> body) {
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<Map<String, Object>> data = new HttpEntity<>(body,headers);
ResponseEntity<ResultResp> resp = restTemplate.postForEntity("http://api-server/" + name , data, ResultResp.class);
return resp.getBody();
}
@Override
public ResultResp<Map<String, Object>> putForObject(String name, Integer id, Map<String, Object> body) {
HttpEntity<Map<String, Object>> data = new HttpEntity<>(body);
ResponseEntity<ResultResp> resp = restTemplate.exchange("http://api-server/" + name + "/{1}", HttpMethod.PUT, data, ResultResp.class, id);
return resp.getBody();
}
@Override
public ResultResp<Map<String, Object>> deleteForObject(String name, Integer id) {
ResponseEntity<ResultResp> resp = restTemplate.exchange("http://api-server/" + name + "/{1}", HttpMethod.PUT, null, ResultResp.class, id);
return resp.getBody();
}
}
最后需要一个控制器，用于转发使用：
package com.test.router.app.v1;
import com.test.router.app.base.BaseV1Controller;
import com.test.router.constant.Constant;
import com.test.router.system.base.IDefaultRestController;
import com.test.router.system.core.ResultResp;
import com.test.router.system.model.http.Request;
import com.test.router.system.service.resources.IAPIDispatcherService;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
@RestController
public class TestController extends BaseV1Controller implements IDefaultRestController {
@Resource
private IAPIDispatcherService dispatcherService;
/**
* http://127.0.0.1:7001/v1/router?name=v2/test&namespace=api&user=avc
* @param request
* @param response
* @return
*/
@RequestMapping(value = "/router", method = RequestMethod.GET)
@Override
public ResultResp<Map<String, Object>> doGet(HttpServletRequest request, HttpServletResponse response) {
String namespace = request.getParameter("namespace");
String name = request.getParameter("name");
if (Constant.NAMESPACE_API.equals(namespace)) {
Map<String, String> args = this.initUriVariables(name, request);
StringBuffer sb = new StringBuffer();
if (name.lastIndexOf("?") == -1) {
name += "?";
}
sb.append(name);
args.forEach((k, v) -> {
sb.append(k).append("=").append(v).append("&");
});
return dispatcherService.getForObject(sb.toString(), null);
}
return new ResultResp<>();
}
/**
* http://127.0.0.1:7001/v1/router?user=avc
*
*
* {
* "header":{
* "namespace":"api",
* "name":"v2/test"
* },
* "payload":{
* "username":"张三",
* "age":15
* }
* }
* @param body
* @param request
* @param response
* @return
*/
@RequestMapping(value = "/router", method = RequestMethod.POST)
@Override
public ResultResp<Map<String, Object>> doPost(@RequestBody Request<Map<String, Object>> body, HttpServletRequest request, HttpServletResponse response) {
String namespace = body.getHeader().getNamespace();
String name = body.getHeader().getName();
if (Constant.NAMESPACE_API.equals(namespace)) {
Map<String, String> args = this.initUriVariables(name, request);
StringBuffer sb = new StringBuffer();
if (name.lastIndexOf("?") == -1) {
name += "?";
}
sb.append(name);
args.forEach((k, v) -> {
sb.append(k).append("=").append(v).append("&");
});
return dispatcherService.postForObject(sb.toString(), body.getPayload());
}
return new ResultResp<>();
}
@Override
public ResultResp<Map<String, Object>> doPut(@PathVariable Integer id, @RequestBody Request<Map<String, Object>> obj, HttpServletRequest request, HttpServletResponse response) {
return null;
}
@Override
public ResultResp<Map<String, Object>> doDelete(@PathVariable Integer id, HttpServletRequest request, HttpServletResponse response) {
return null;
}
}
这样子基本上完成，主要使用浏览器打开http://127.0.0.1:7001/v1/router?name=v2/test&namespace=api&user=avc，就会根据name对应的值去获取api-service的对应的接口。
更多请参阅:
https://cloud.spring.io/spring-cloud-static/spring-cloud-netflix/2.2.0.RC1/reference/html/#spring-cloud-ribbon
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