SpringCloud Cloud查找调用REST服务使用RestTemplate(ribbon负载) 或feign模式火推13

SpringCloud

搭建SpringCloud服务中心

在pom.xml引入spring-cloud开发包

<!-- springboot-parent -->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.7.RELEASE</version>
<relativePath/>
</parent>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.7</java.version>
</properties>

<dependencies>
<!-- springcloud-eureka-server -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka-server</artifactId>
<version>1.3.4.RELEASE</version>
</dependency>

</dependencies>

<!-- springcloud-parent -->
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-parent</artifactId>
<version>Brixton.SR5</version>
<type>pom</type>
</dependency>
</dependencies>
</dependencyManagement>

在application.properties配置eureka

#server
server.port=2222

#eureka
#spring.application.name=eureka_server
eureka.client.registerWithEureka=false
eureka.client.fetchRegistry=false
eureka.client.serviceUrl.defaultZone=http://localhost:2222/eureka

在主启用类追加@EnabledEurekaServer标记

@EnableEurekaServer//启用eureka服务器
@SpringBootApplication
public class EurekaServerBootApplication {

public static void main(String[] args) {
// TODO Auto-generated method stub
SpringApplication.run(EurekaServerBootApplication.class, args);
}

}

将REST服务注册到Cloud

在pom.xml中追加spring-cloud-eureka定义

<!-- springcloud-parent -->
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-parent</artifactId>
<version>Brixton.SR5</version>
<type>pom</type>
</dependency>
</dependencies>
</dependencyManagement>

<!-- springcloud-eureka -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
<version>1.3.4.RELEASE</version>
</dependency>

在application.properties添加eureka注册参数

#eureka
spring.application.name=ovls_user_server
eureka.client.serviceUrl.defaultZone=http://localhost:2222/eureka

在主启动类追加@EabledDiscoveryClient

@EnableDiscoveryClient//启用eureka服务查找和注册
@SpringBootApplication
@ServletComponentScan
@MapperScan(basePackages={"cn.xdl.ovls.user.dao"})
public class UserServiceBootApplication {

public static void main(String[] args) {
SpringApplication.run(UserServiceBootApplication.class, args);
}

}

从Cloud查找调用REST服务

使用RestTemplate(ribbon负载)

在pom.xml中定义ribbon开发包

<!-- springcloud-ribbon -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-ribbon</artifactId>
<version>1.3.4.RELEASE</version>
</dependency>

定义一个RestTemplate配置，启用ribbon负载

@Configuration
public class RestTemplateConfig {

@Bean
@LoadBalanced//启用ribbon负载均衡调用服务
public RestTemplate cteateRestTemplate(){
return new RestTemplate();
}

}

注入RestTemplate，调用eureka服务

@Autowired
private RestTemplate restTemplate;

ResponseResult userResult  = restTemplate.getForObject(
"http://USERSERVER/user/token?token="+token, ResponseResult.class);

提示：调用的URL地址，格式为http://服务名/uri

feign模式

在pom.xml中定义ribbon、feign开发包

<!-- springcloud-ribbon -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-ribbon</artifactId>
<version>1.3.4.RELEASE</version>
</dependency>
<!-- springcloud-feign -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-feign</artifactId>
<version>1.3.4.RELEASE</version>
</dependency>

定义一个Fegin远程调用接口

@FeignClient(name="USERSERVER")//对应哪个服务实例
public interface UserServiceRemote {

//调用/user/token服务
@RequestMapping(value="/user/token",method=RequestMethod.GET)
public ResponseResult checkToken(String token);

}

提示：@FeignClient(name="注册中心服务实例名")，@RequestMapping请求定义跟UserController入口定义相同
注入Feign远程接口对象，使用服务

@Autowired
private UserServiceRemote userRemote;

//利用Remote对象调用服务
ResponseResult userResult = userRemote.checkToken(token);

在主入口启动类前
b61b
追加@EnableFeignClients标记

@EnableFeignClients//启用Feign接口调用
@EnableDiscoveryClient
@SpringBootApplication
@ServletComponentScan
@MapperScan(basePackages={"cn.xdl.ovls.paper.dao"})
public class PaperServiceBootApplication {

public static void main(String[] args) {
SpringApplication.run(PaperServiceBootApplication.class, args);
}

}