springcloud(十四）、ribbon负载均衡策略应用案例

一、eureka-server服务中心项目不再创建

二、eureka-common-empdept公共组件项目不再掩饰

三、创建eureka-client-provider-empdept-one提供者项目

3.1 结构如下

pom.xml文件内容如下：

 <dependencies>
         <dependency>
             <groupId>cn.kgc</groupId>
             <artifactId>eureka-common-empdept</artifactId>
             <version>0.0.1-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-jdbc</artifactId>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
         <dependency>
             <groupId>org.mybatis.spring.boot</groupId>
             <artifactId>mybatis-spring-boot-starter</artifactId>
             <version>2.1.0</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
         </dependency>

         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
             <version>5.1.38</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
     </dependencies>

pom.xml

3.2 DeptMapper.java

 package cn.kgc.mapper;

 import cn.kgc.vo.Dept;
 import org.apache.ibatis.annotations.Select;

 import java.util.List;

 /**
  * Created by Administrator on 2019/8/29.
  */
 public interface DeptMapper {
     @Select("select * from dept")
     List<Dept> optionData();
 }

DeptMapper.java

3.3EmpMapper.java

 package cn.kgc.mapper;

 import cn.kgc.vo.Emp;
 import org.apache.ibatis.annotations.Select;

 import java.util.List;
 import java.util.Map;

 /**
  * Created by Administrator on 2019/8/29.
  */
 public interface EmpMapper {
     List<Map<String,Object>> showData(Emp emp);
 }

EmpMapper.java

3.4EmpMapper.xml

 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE mapper
         PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 <mapper namespace="cn.kgc.mapper.EmpMapper">
     <select id="showData" resultType="map" parameterType="emp">
         select d.dname,d.loc,e.* from emp e,dept d where e.deptno=d.deptno
         <if test="empno!=null">
             and e.empno=#{empno}
         </if>
         <if test="deptno!=null and deptno!=-1">
             and e.deptno=#{deptno}
         </if>
     </select>
 </mapper>

EmpMapper.xml

3.5DeptService.java

 package cn.kgc.service;

 import cn.kgc.vo.Dept;
 import org.apache.ibatis.annotations.Select;

 import java.util.List;

 /**
  * Created by Administrator on 2019/8/29.
  */
 public interface DeptService {
     List<Dept> optionData();
 }

DeptService.java

3.6　　DeptServiceImpl.java

 package cn.kgc.service;

 import cn.kgc.mapper.DeptMapper;
 import cn.kgc.vo.Dept;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;

 import java.util.List;

 @Service
 public class DeptServiceImpl implements DeptService{

     @Autowired
     private DeptMapper deptMapper;

     public List<Dept> optionData() {
         return deptMapper.optionData();
     }
 }

DeptServiceImpl.java

3.7 EmpService.java

 package cn.kgc.service;

 import cn.kgc.vo.Emp;

 import java.util.List;
 import java.util.Map;

 /**
  * Created by Administrator on 2019/8/29.
  */
 public interface EmpService {
     List<Map<String,Object>> showData(Emp emp);
 }

EmpService.java

3.8  EmpServiceImpl.java

 package cn.kgc.service;

 import cn.kgc.mapper.EmpMapper;
 import cn.kgc.vo.Emp;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;

 import java.util.List;
 import java.util.Map;

 @Service
 @Transactional
 public class EmpServiceImpl implements EmpService{
     @Autowired
     private EmpMapper empMapper;

     public List<Map<String, Object>> showData(Emp emp) {
         return empMapper.showData(emp);
     }
 }

EmpServiceImpl.java

3.9 CenterController,java

 package cn.kgc.controller;

 import cn.kgc.mapper.DeptMapper;
 import cn.kgc.mapper.EmpMapper;
 import cn.kgc.service.DeptService;
 import cn.kgc.service.EmpService;
 import cn.kgc.vo.Dept;
 import cn.kgc.vo.Emp;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;

 import java.util.List;
 import java.util.Map;

 @RestController
 public class CenterController {

     @Autowired
     private EmpService empService;

     @Autowired
     private DeptService deptService;

     private Logger logger= LoggerFactory.getLogger(CenterController.class);

     @RequestMapping("/ribbon.do")
     public String ribbonTest(@RequestParam("count") Integer count){
         logger.info("provider>>> "+count+" <<<eureka-client-provider-one-8762");
         return "provider的ribbon测试";
     }

     @RequestMapping("/option.do")
     public List<Dept> optionData() {
         return deptService.optionData();
     }

     @RequestMapping("/data.do")
     public List<Map<String, Object>> showData(@RequestBody Emp emp) {
         return empService.showData(emp);
     }
 }

CenterController.java

3.10 启动类的设置

 package cn.kgc;

 import org.mybatis.spring.annotation.MapperScan;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

 @MapperScan("cn.kgc.mapper")
 @EnableEurekaClient
 @SpringBootApplication
 public class EurekaClientProviderEmpdeptOneApplication {

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

 }

启动类

3.11 编写属性文件

 spring.application.name=provider-empdept

 server.port=8762

 eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/

 spring.datasource.driver-class-name=com.mysql.jdbc.Driver
 spring.datasource.url=jdbc:mysql://192.168.117.145:3306/kh66
 spring.datasource.username=root
 spring.datasource.password=ok

 mybatis.type-aliases-package=cn.kgc.vo

 mybatis.mapper-locations=classpath:mapper/*.xml

application.properties

3.12 启动eureka-server、eureka-client-provider-empdept-one 查看结果

四、创建eureka-client-provider-empdept-two提供者项目，所有的代码模块和eureka-client-provider-empdept-one一模一样，只是端口号不一样即可

五、创建eureka-client-consumer-empdept-p-one消费者项目，

5.1 结构如下

5.2 编写 EmpDeptProviderFeign.java

 package cn.kgc.fegin;

 import cn.kgc.vo.Dept;
 import cn.kgc.vo.Emp;
 import org.springframework.cloud.openfeign.FeignClient;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;

 import java.util.List;
 import java.util.Map;

 @FeignClient("provider-empdept")
 public interface EmpDeptProviderFeign {

     @RequestMapping("/ribbon.do")
     public String ribbonTest(@RequestParam("count") Integer count);

     @RequestMapping("/option.do")
     public String optionData();

     @RequestMapping("/data.do")
     public String showData(@RequestBody Emp emp);
 }

EmpDeptProviderFeign.java

5.3 CenterController.java

 package cn.kgc.fegin;

 import cn.kgc.vo.Dept;
 import cn.kgc.vo.Emp;
 import org.springframework.cloud.openfeign.FeignClient;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;

 import java.util.List;
 import java.util.Map;

 @FeignClient("provider-empdept")
 public interface EmpDeptProviderFeign {

     @RequestMapping("/ribbon.do")
     public String ribbonTest(@RequestParam("count") Integer count);

     @RequestMapping("/option.do")
     public String optionData();

     @RequestMapping("/data.do")
     public String showData(@RequestBody Emp emp);
 }

CenterController.java

5.4 application.properties属性文件编写

 spring.application.name=consumer-empdept-p-one

 server.port=8764

 eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/

application.properties

5.5 编写启动类

 package cn.kgc;

 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
 import org.springframework.cloud.netflix.ribbon.RibbonClient;
 import org.springframework.cloud.openfeign.EnableFeignClients;

 @EnableFeignClients
 @EnableEurekaClient
 @SpringBootApplication
 public class EurekaClientConsumerEmpdeptPOneApplication {

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

 }

启动类

5.6  启动项目顺序为：eureka-server、eureka-client-provider-empdept-one、eureka-client-provider-empdept-two、eureka-client-consumer-empdept-p-one

因为没有设置负载均衡策略，因此他会按照默认方式既 轮询策略进行调用，

5.7 再次选择配置ribbon负载均衡策略为随机分配，再看效果，属性文件设置如下

 spring.application.name=consumer-empdept-p-one

 server.port=8764

 eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/

 #随机分配策略
 provider-empdept.ribbon.NFLoadBalancerRuleClassName=com.netflix.loadbalancer.RandomRule

application.properties

5.8 再次按照刚才的启动顺序启动，再来查看

可以挨个把负载均衡策略试一下