SpringCloud Eureka Provider及Consumer的实现
Eureka-Provider 服务的提供者
新建一个服务提供者项目
1、导入pom文件
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Greenwich.SR3</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>
2、在启动类上加注解
@SpringBootApplication
@EnableDiscoveryClient // 这个注解加不加都可以,因为Eureka
public class EurekaProviderApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaProviderApplication.class, args);
}
}
上边那个@EnableDiscoverClient 注解加不加都行的原因会在后边表名
3、在Eureka-Provider项目中添加一个简单的接口
@RestController
public class EurekaProviderController {
@GetMapping("/provider")
public String provider(@RequestParam String aaa){
return "eureka-provider-return" + aaa;
}
}
4、以上配置完成之后启动Eureka-Provider
启动后会在控制台输出
DiscoveryClient_EUREKA-PROVIDER/192.168.1.4:eureka-provider:8000: registering service...
同时看localhost:8761 页面的Instance currently registered 会多出一条信息
Application AMIs Availability Zones Status
EUREKA-PROVIDER n/a (1) (1) UP (1) - 192.168.1.4:eureka-provider:8000
Eureka-Consumer 服务的调用者
调用者的配置和上边提供者类似,applicatioin.yml配置修改server.port=8100
1、启动类修改
@SpringBootApplication // 另一个发现服务的注解可以不用谢(SpringCloud版本要在Edgware之后)
public class EurekaConsumerApplication {
@Bean
@LoadBalanced
RestTemplate restTemplate(){
return new RestTemplate();
}
public static void main(String[] args) {
SpringApplication.run(EurekaConsumerApplication.class, args);
}
}
2、编写一个调用接口的类
@RestController
public class EurekaConsumerController {
@Autowired
private RestTemplate restTemplate;
@GetMapping("/consumer")
@GetMapping("/consumer")
public String consumer(@RequestParam String aaa){
return restTemplate.getForObject("http://EUREKA-PROVIDER/provider?aaa=" + aaa,String.class );
}
}
3、启动服务调用者
启动后,调用调用者的触发地址localhost:8100/consumer?aaa=consumerSemdParamter
浏览器显示内容:
eureka-provider-returnconsumerSemdParamter
上边遗留的一个问题,eureka-client不加@EnableDiscoveryClient以将自己注册到注册中心
先看EurekaClientAutoConfiguration类中
@Configuration
@EnableConfigurationProperties
@ConditionalOnClass(EurekaClientConfig.class)
@Import(DiscoveryClientOptionalArgsConfiguration.class)
@ConditionalOnBean(EurekaDiscoveryClientConfiguration.Marker.class)
@ConditionalOnProperty(value = "eureka.client.enabled", matchIfMissing = true)
@ConditionalOnDiscoveryEnabled
@AutoConfigureBefore({ NoopDiscoveryClientAutoConfiguration.class,
CommonsClientAutoConfiguration.class, ServiceRegistryAutoConfiguration.class })
@AutoConfigureAfter(name = {
"org.springframework.cloud.autoconfigure.RefreshAutoConfiguration",
"org.springframework.cloud.netflix.eureka.EurekaDiscoveryClientConfiguration",
"org.springframework.cloud.client.serviceregistry.AutoServiceRegistrationAutoConfiguration" })
public class EurekaClientAutoConfiguration {
}
可以看到该类加载的条件是需要有EurekaDiscoveryClientConfiguration.Maker.class的Bean存在,并且eureka.client.enabled为true,因为该值默认为true,所以不需要关注,因此重要的就是EurekaDiscoveryClientConfiguration.Maker.class这个,而这个类在Dalston之前的旧版本是不会自动加载的,而在Edgware之后,该类就配置到spring.factories文件中了,改文件中所配置的bean在springboot启动的时候就会被加载(所以不需要手动配上注册服务的注解了,springboot会自动配置)
以上是 SpringCloud Eureka Provider及Consumer的实现 的全部内容, 来源链接: utcz.com/z/349438.html