eureka 服务已经启动 http://localhost:8761/
注: 在启动文件加上 注解
@EnableEurekaServer application.yml 配置文件
eureka:
instance:
hostname: localhost
client:
service-url:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/ # 相互注册实现高可用
register-with-eureka: false # true 将自己注册到eureka
fetch-registry: false
server:
enable-self-preservation: false
spring:
application:
name: eureka # 服务名称,注册之后的名称
server:
port: 8761
clienta 服务注册eureka
启动文件加入注解:
@EnableEurekaClient
application.yml 配置文件 端口8000
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/ #,http://localhost:8762/eureka/,http://localhost:8763/eureka/
# instance:
# hostname: clientName
spring:
application:
name: clienta
@RestController
public class TestController {
@GetMapping("/msg")
public String msg() {
return "this is clienta msg!!!";
}
}
访问 http://localhost:8000/msg 能返回结果
client 服务注册eureka 同clienta
在clien中调用clienta中方法
第一种方法:
@RestController
public class HelloController {
@Autowired
LoadBalancerClient loadBalancerClient;
@GetMapping("/test")
public String test() {
// 获取服务实例
ServiceInstance serviceInstance = loadBalancerClient.choose("CLIENTA");
// 根据实例获取host port
String host = serviceInstance.getHost();
int port = serviceInstance.getPort();
// 拼接url
String url = String.format("http://%s:%s%s", host, port, "/msg");
RestTemplate restTemplate = new RestTemplate();
String res = restTemplate.getForObject(url, String.class);
return res;
}
}
第二种: 配置config
@Component
public class RestTemplateConfig {
@Bean
@LoadBalanced
public RestTemplate restTemplate() {
return new RestTemplate();
}
}
@RestController
public class HelloController {
@Autowired
private RestTemplate restTemplate;
@GetMapping("/test")
public String test() {
String res = restTemplate.getForObject("http://CLIENTA/msg", String.class);
return res;
}
}
启动client 端口 8081
访问: http://localhost:8081/test
以上为基于RestTemplate 通信方式.使用Feign通信eureka clienta 项目不变化修改 client 项目:1. 添加依赖
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
2. 启动类添加注解
@EnableFeignClients
3. 创建一个接口 并增加注解
@FeignClient(name = "CLIENTA") // name是服务的名字
public interface ClientAClient {
@GetMapping("/msg") // 基于路由匹配, 方法名可以不同
String msg();
}
4. 在controller中直接使用
@RestController
public class HelloController {
@Autowired
private ClientAClient clientAClient;
@GetMapping("/test")
public String test() {
return clientAClient.msg();
}
}
附pom.xml文件 注意版本对应 http://spring.io/projects/spring-cloud 官网
<?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>
<groupId>com.example</groupId>
<artifactId>client</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>client</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<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>Finchley.SR2</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.cloud</groupId>
<artifactId>spring-cloud-commons</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</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>