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文件目錄結(jié)構(gòu)

springcloud中Ribbon和RestTemplate實(shí)現(xiàn)服務(wù)調(diào)用與負(fù)載均衡

文件目錄結(jié)構(gòu)很重要，特別注意的是rule文件要放在主啟動(dòng)類上一級(jí)位置，才能夠掃描。

寫pom

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</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>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>

因?yàn)閑ureka的依賴已經(jīng)整合了ribbon的依賴，所以不用額外引入新的東西。

改yml

server:
port: 80
spring:
application:
name: cloud-book-consumer
eureka:
client:
register-with-eureka: false
fetch-registry: true
service-url:
defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka

主啟動(dòng)

@SpringBootApplication
@EnableEurekaClient
@RibbonClient(name = "CLOUD-BOOK-SERVICE", configuration = LoadBalanceRule.class) //更換輪詢算法
public class RestTemplateMain80 {
public static void main(String[] args) {
SpringApplication.run(RestTemplateMain80.class,args);
}
}

業(yè)務(wù)邏輯

rules層

在圖示文件目錄下新建LoadBalanceRule.class，用于更換負(fù)載均衡算法。

@Configuration
public class LoadBalanceRule {
@Bean
public IRule iRule() {
// 定義為隨機(jī)
return new RandomRule();
}
}

config層

開(kāi)啟restTemplate負(fù)載均衡
在config文件夾下創(chuàng)建LoadBalanceConfig.class

@Configuration
public class LoadBalanceConfig {
@Bean
@LoadBalanced //開(kāi)啟負(fù)載均衡
public RestTemplate getReatTemplate(){
return new RestTemplate();
}
}

controller層

新建BookController.class
寫業(yè)務(wù)代碼

@RestController
@Slf4j
public class BookController {
@Resource
private RestTemplate restTemplate;
public static final String PAYMENT_URL = "http://CLOUD-BOOK-SERVICE";
@GetMapping(value = "restTemplate/book/getAllBooks")//只要json數(shù)據(jù)時(shí)
public CommonResult getAllBooks(){
return restTemplate.getForObject(PAYMENT_URL+"/book/getAllBooks",CommonResult.class);
}
@GetMapping("restTemplate/book/getAllBooks2") //需要知道更多數(shù)據(jù)時(shí)，使用getForEntity方法
public CommonResult getAllBooks2(){
ResponseEntity<CommonResult> resultResponseEntit = restTemplate.getForEntity(PAYMENT_URL+"/book/getAllBooks",CommonResult.class);
if (resultResponseEntit.getStatusCode().is2xxSuccessful()){
log.info(resultResponseEntit.getStatusCode()+"\t"+resultResponseEntit.getHeaders());
return resultResponseEntit.getBody();
}else {
return new CommonResult<>(444,"操作失敗");
}
}
@GetMapping(value = "restTemplate/book/index")
public String index() {
return restTemplate.getForObject(PAYMENT_URL+"/book/index",String.class);
}
}

使用restTemplate+Ribboin實(shí)現(xiàn)服務(wù)調(diào)用和負(fù)載均衡完成。

手寫Ribbon負(fù)載均衡算法 lb層

1.新建LoadBalancer接口，添加代碼

public interface LoadBalancer {
ServiceInstance instances(List<ServiceInstance> serviceInstances);
}

2.新建實(shí)現(xiàn)類MyLB

@Component
public class MyLB implements LoadBalancer {
private AtomicInteger atomicInteger = new AtomicInteger(0);
//求第幾次訪問(wèn) 自旋鎖思想
public final int getAndIncrement(){
int current;
int next;
do {
current = this.atomicInteger.get();
next = current >=2147483647 ? 0 : current+1;
}while(!this.atomicInteger.compareAndSet(current,next));
System.out.println("***第幾次訪問(wèn)next->"+next);
return next;
}
//負(fù)載均衡算法,實(shí)現(xiàn)roundRobin算法
@Override
public ServiceInstance instances(List<ServiceInstance> serviceInstances) {
int index = getAndIncrement() % serviceInstances.size();
return serviceInstances.get(index);
}
}

修改BookController

@RestController
@Slf4j
public class BookController {
@Resource
private RestTemplate restTemplate;
@Resource
private LoadBalancer loadBalancer;
@Resource
private DiscoveryClient discoveryClient;
public static final String PAYMENT_URL = "http://CLOUD-BOOK-SERVICE";
@GetMapping(value = "restTemplate/book/getAllBooks")//只要json數(shù)據(jù)時(shí)
public CommonResult getAllBooks(){
List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-BOOK-SERVICE");
if (instances == null || instances.size() <= 0){
return null;
}
ServiceInstance serviceInstance = loadBalancer.instances(instances);
URI uri = serviceInstance.getUri();
return restTemplate.getForObject(uri+"/book/getAllBooks",CommonResult.class);
}
@GetMapping(value = "restTemplate/book/index")
public String index() {
List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-BOOK-SERVICE");
if (instances == null || instances.size() <= 0){
return null;
}
ServiceInstance serviceInstance = loadBalancer.instances(instances);
URI uri = serviceInstance.getUri();
return restTemplate.getForObject(uri+"/book/index",String.class);
}
}

修改文件注解

刪去主啟動(dòng)類的更換負(fù)載均衡算法注解

@RibbonClient(name = “CLOUD-BOOK-SERVICE”, configuration = LoadBalanceRule.class)

刪去LoadBalanceConfig中開(kāi)啟負(fù)載均衡算法注解

@LoadBalanced

手寫Ribbon算法并使用完成

以上就是Ribbon和RestTemplate實(shí)現(xiàn)服務(wù)調(diào)用與負(fù)載均衡的詳細(xì)內(nèi)容，更多關(guān)于Ribbon和RestTemplate服務(wù)與負(fù)載的資料請(qǐng)關(guān)注服務(wù)器之家其它相關(guān)文章！

原文鏈接：https://blog.csdn.net/super1223/article/details/115384982