既然分布式系统,那么就避免不了服务之间的调用,我们这里使用的是springcloud的openfeign.
springcloud最初是以集成Netflix的feign来实现rpc调用的,之后的事情众所周知Netflix的这些微服务组件都是停更或者不再维护,所以springcloud得自己出一套rpc调用框架,openfeign就出现了,openfeign是在feign的基础上演变的,基本的使用是没有变的.
以feign为基础的开发的,属于springcloud自己维护的,是伪声明示rpc调用框架,底层实质干活的是resttemplate.
Netflix的rpc调用框架,是伪声明示rpc调用框架,底层实质干活的是resttemplate.
便捷的rpc调用工具.
apche组织维护http调用工具.
客户端负载均衡算法提供者,常见的负载均衡规则有轮询、hash等.
<dependency>
<groupId>org.springframework.cloudgroupId>
<artifactId>spring-cloud-dependenciesartifactId>
<version>Greenwich.SR6version>
<type>pomtype>
<scope>importscope>
dependency>
package com.ccm.server.basic;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.context.annotation.ComponentScan;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
/**
* @Description server-basic服务启动类
* @Author zhouzhiwu
* @CreateTime 2020/7/17 9:35
*/
@EnableDiscoveryClient //注册中心客户端
@ComponentScan(basePackages = "com.ccm")
@EnableSwagger2
@SpringBootApplication //声明为一个启动类
public class ServerBasicApplication {
public static void main(String[] args) {
SpringApplication.run(ServerBasicApplication.class,args);
}
}
server:
port: 2001 #服务端口
spring:
application:
name: server-basic #服务名称
cloud:
nacos:
discovery:
server-addr: 47.96.131.185:8848
config:
server-addr: 47.96.131.185:8848 #nacos config配置中心ip和端口
file-extension: yaml #文件扩展名格式,针对于默认的{spring.application.name}-${profile}.${file-extension:properties}配置
enabled: true #开启或关闭配置中心
package com.ccm.server.basic.controller;
import com.ccm.common.exception.result.ResultSet;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* @Description openfeign测试
* @Author zhouzhiwu
* @CreateTime 2020/7/17 9:38
*/
@RestController
@RequestMapping(value = "openFeignTest")
@Api(tags = "openfeign测试服务端")
public class OpenFeignTestController {
@ApiOperation(value = "openfeign测试服务端暴露接口")
@GetMapping(value = "test01")
public ResultSet<String> test01() {
return ResultSet.success("我是server-basic服务的数据");
}
}
<dependency>
<groupId>org.springframework.cloudgroupId>
<artifactId>spring-cloud-starter-openfeignartifactId>
dependency>
package com.ccm.server.user;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Import;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
/**
* @Description server-user服务启动类
* @Author zhouzhiwu
* @CreateTime 2020/07/03 14:04
*/
@EnableFeignClients
@EnableDiscoveryClient //注册中心客户端
@ComponentScan(basePackages = "com.ccm")
@EnableSwagger2
@MapperScan(basePackages = "com.ccm.server.user.dao.mysql.mapper")
@SpringBootApplication //声明为一个启动类
@Import(value = PaginationInterceptor.class)
public class ServerUserApplication {
public static void main(String[] args) {
SpringApplication.run(ServerUserApplication.class,args);
}
}
package com.ccm.server.user.controller;
import com.ccm.common.exception.ServerException;
import com.ccm.common.exception.result.ResultSet;
import com.ccm.server.user.openfeign.ServerBasicFeign;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;
import org.omg.CORBA.SystemException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
/**
* @Description openfeign测试
* @Author zhouzhiwu
* @CreateTime 2020/7/17 9:38
*/
@RestController
@RequestMapping(value = "openFeignTest")
@Api(tags = "openfeign测试客户端")
public class OpenFeignTestController {
@Autowired
private ServerBasicFeign serverBasicFeign;
@ApiOperation(value = "server-user服务调用server-basic服务")
@GetMapping(value = "test01")
public ResultSet<String> test01() {
ResultSet<String> feignResultset = serverBasicFeign.test01();
if(feignResultset.getCode() == 0) {
return ResultSet.success(feignResultset.getData());
}
throw new ServerException("调用feign服务失败");
}
}
@FeignClient(name = “server-basic”)
代表这个interface调用server-basic微服务.
@GetMapping(value = “openFeignTest/test01”)
代表用get请求调用server-basic服务路径为openFeignTest/test01的接口.
ResultSet
代表使用ResultSet接收调用接口返回的数据.
package com.ccm.server.user.openfeign;
import com.ccm.common.exception.result.ResultSet;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
/**
* @Description 调用server-basic的feign层
* @Author zhouzhiwu
* @CreateTime 2020/07/17 9:46
*/
@FeignClient(name = "server-basic")
public interface ServerBasicFeign {
@GetMapping(value = "openFeignTest/test01")
ResultSet<String> test01();
}
成功拿到server-basic接口返回的数据,完事.
源码地址:https://gitee.com/chouchimoo/ccm-mall.git(本章节分支:zj-14)