SpringCloud 查找调用REST服务使用RestTemplate(ribbon负载)或feign模式 教程源码 火推

需要搭建一个lj_ovls_eureka_server

搭建2个 lj_ovls_paper_server ，lj_user_server ，这样才可以看到效果

源码：

https://gitee.com/qq1350048638/lj_ovls_paper_server

https://gitee.com/qq1350048638/lj_user_server

https://gitee.com/qq1350048638/lj_ovls_eureka_server

公共包 ：https://gitee.com/qq1350048638/lj_common

另前端界面

https://gitee.com/qq1350048638/lj_study_web/

eclipse各工程结构图



lj_ovls_eureka_server目录结构



pom.xml

<!-- 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>

EurekaServerBootApplication 启动类

package com.lj.ovls;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@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);
}

}

lj_ovls_paper_server工程结构



pom.xml

springcloud-ribbon springcloud-feign 2种方式

<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>

<!-- test -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>

<dependency>
<groupId>com.lj</groupId>
<artifactId>lj_common</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>

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

</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>

PaperServiceBootApplication 启动类

@EnableFeignClients

@EnableDiscoveryClient 注入

package com.lj.ovls;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;

@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
@ServletComponentScan
@MapperScan(basePackages={"com.lj.ovls.paper.dao"})
public class PaperServiceBootApplication {

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

}

使用RestTemplate(ribbon负载)

package com.lj.ovls.paper.config;

@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

USERSERVER 是application.properties里面设置的，相当于localhost:8881

@Autowired
private RestTemplate restTemplate;

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

application.properties

里面设置paper_server 服务器的别名

相当于 localhost:8884 通过eureka服务器 对应的 别名 paperserver 即可访问

server.port=8884
#eureka
spring.application.name=paperserver
eureka.client.serviceUrl.defaultZone=http://localhost:2222/eureka

feign模式

pom.xml 前面已经设置了

定义一个Fegin远程调用接口

package com.lj.ovls.paper.remote;

import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.lj.ovls.common.entity.ResponseResult;

@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);

在主入口启动类前追加@EnableFeignClients标记 前面已经设置