spring-cloud学习之4.微服务请求打通

一:前提

我们上一篇中已经配置好了feign，本次我们配置服务端service，来实现getway->api->service的请求流程。

1.pom

 <!--eureka 客户端 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

2.配置

本次只需要配置eureka客户端即可

server:
  port: 4001
spring:
  application:
    name: dandelion-service
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driverClassName: com.mysql.cj.jdbc.Driver
    druid:
      url: jdbc:mysql://localhost:3306/dandelion?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
      username: root
      password: 123456

mybatis-plus:
  mapper-locations: classpath*:/mapper/**/*Mapper.xml
  type-aliases-package: club.dandelion.cloud.service.entity

eureka:
  client:
    service-url:
      defaultZone: http://localhost:1001/eureka
  instance:
    instance-id:  ${spring.application.name}:${server.port}
    prefer-ip-address: true     #访问路径可以显示IP地址

3.contr

import club.dandelion.cloud.common.R;
import club.dandelion.cloud.service.base.BaseController;
import club.dandelion.cloud.service.entity.SysDept;
import club.dandelion.cloud.service.service.ISysDeptService;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * 部门 提供者
 *
 * @author zmr
 * @date 2019-05-20
 */
@RestController
@RequestMapping("dept")
@Slf4j
public class SysDeptController extends BaseController {
    @Autowired
    private ISysDeptService sysDeptService;

    @Value("${server.port}")
    private String port;

    /**
     * 查询部门列表
     */
    @RequestMapping("list")
    public R list(SysDept sysDept) {

        log.info("端口：" + port);

        Page<SysDept> page = new Page<>(sysDept.getPageNum(), sysDept.getPageSize());
        List<SysDept> list = sysDeptService.selectDeptList(page, sysDept);
        page.setRecords(list);
        return R.ok(port);
    }


}

4.启动多个实例

idea可以启动多个实例，具体操作百度。

我们把之前的项目启动

 1001：注册中心

2001：getwang网关

3001：feign

4001/4002:服务实现类，完全一样的项目，只是端口不同

5.示例

feign默认轮询，可单独配置某个服务比重。

 

 6.配置负载均衡策略

server:
  port: 3001
spring:
  application:
    name: dandelion-api

eureka:
  client:
    service-url:
      defaultZone: http://localhost:1001/eureka
  instance:
    instance-id:  ${spring.application.name}:${server.port}
    prefer-ip-address: true

feign:
  #开启feign熔断支持
  hystrix:
    enabled: true

#服务名
dandelion-service:
  ribbon:
    # 负载方式
    NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule

具体的策略方式有很多，请查看官方文档或百度