SpringBoot-Eureka 服务注册与发现-环境搭建
一、创建 Maven 父工程，springcloud2022
1. 导入 POM 依赖
<!-- 声明为父工程，聚合工程 -->
<packaging>pom</packaging>
<!-- 统一管理jar包版本 -->
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<junit.version>4.12</junit.version>
<log4j.version>1.2.17</log4j.version>
<lombok.version>1.16.18</lombok.version>
<mysql.version>5.1.47</mysql.version>
<druid.version>1.1.16</druid.version>
<mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
</properties>
<!-- 子模块继承之后，提供作用：锁定版本+子modlue不用写groupId和version -->
<dependencyManagement>
<dependencies>
<!--spring boot 2.2.2-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.2.2.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!--spring cloud Hoxton.SR1-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Hoxton.SR1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!--spring cloud alibaba 2.1.0.RELEASE-->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-alibaba-dependencies</artifactId>
<version>2.1.0.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>${druid.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>${mybatis.spring.boot.version}</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<optional>true</optional>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork>
<addResources>true</addResources>
</configuration>
</plugin>
</plugins>
</build>
2. 在 Maven 管理界面，跳过单元测试，执行 mvn:install 命令
二、创建子模块，服务提供者，cloud-provider-payment8001
1. 添加 POM 依赖
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
2. 编写 yml，启动类(省略)
server:
port: 8001
spring:
application:
name: cloud-payment-service # 注册服务名
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/cloud2022?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: mh359687
mybatis:
mapperLocations: classpath:/mapper/*.xml
type-aliases-package: com.atguigu.springcloud.entities
3. sql 建库建表
CREATE DATABASE IF NOT EXISTS cloud2022 DEFAULT CHARACTER SET utf8 ;
USE cloud2022;
DROP TABLE IF EXISTS payment ;
CREATE TABLE payment (
id BIGINT (20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
SERIAL VARCHAR (300) DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE = INNODB AUTO_INCREMENT = 33 DEFAULT CHARSET = utf8 ;
INSERT INTO payment (id, SERIAL) VALUES(31, '尚硅谷001'),(32, 'atguigu002') ;
4. 编写 entities
Payment
package com.atguigu.springcloud.entities;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment implements Serializable {
private Long id;
private String serial;
}
JSON 封装类 CommonResult
package com.atguigu.springcloud.entities;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult <T> implements Serializable{
private Integer code;
private String message;
private T data;
public CommonResult(Integer code,String message){
this(code,message,null);//如果这行报错，请安装lombok插件
}
}
5. 编写 Dao
PaymentDao 接口
package com.atguigu.springcloud.dao;
import com.atguigu.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Component;
@Component
@Mapper // mybatis提供的，等价：@MapperScan("com.atguigu.springcloud.dao")
public interface PaymentDao {
public int create(Payment payment);
public Payment getPaymentById(@Param("id") Long id);
}
Mybatis 映射文件
<?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="com.atguigu.springcloud.dao.PaymentDao">
<resultMap id="BaseResultMap" type="com.atguigu.springcloud.entities.Payment">
<id column="id" property="id" jdbcType="BIGINT"></id>
<result column="serial" property="serial" jdbcType="VARCHAR"></result>
</resultMap>
<insert id="create" useGeneratedKeys="true" keyProperty="id">
insert into payment(serial) values(#{serial});
</insert>
<select id="getPaymentById" parameterType="Long" resultMap="BaseResultMap">
select * from payment where id=#{id}
</select>
</mapper>
Service 接口及实现类
接口
package com.atguigu.springcloud.service;
import com.atguigu.springcloud.entities.Payment;
public interface PaymentService {
public int create(Payment payment);
public Payment getPaymentById(Long id);
}
实现类
package com.atguigu.springcloud.service.impl;
import com.atguigu.springcloud.dao.PaymentDao;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.service.PaymentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class PaymentServiceImpl implements PaymentService {
@Autowired
private PaymentDao paymentDao;
@Override
public int create(Payment payment) {
return paymentDao.create(payment);
}
@Override
public Payment getPaymentById(Long id) {
return paymentDao.getPaymentById(id);
}
}
Controller
package com.atguigu.springcloud.controller;
import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import javax.annotation.PostConstruct;
import javax.annotation.Resource;
@RestController
@Slf4j
@RequestMapping("/payment")
public class PaymentController {
@Resource
private PaymentService paymentService;
@PostMapping("/create")
public CommonResult<Payment> create(@RequestBody Payment payment) {
int result = paymentService.create(payment);
log.info("*****插入结果：" + result);
if (result > 0) {
return new CommonResult(200, "插入数据成功", result);
} else {
return new CommonResult(444, "插入数据失败", null);
}
}
@GetMapping("/get/{id}")
public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id) {
Payment payment = paymentService.getPaymentById(id);
log.info("*****查询结果：" + payment);
if (payment != null) {
return new CommonResult<>(200, "查询成功", payment);
} else {
return new CommonResult<>(444, "查询失败，没有记录" + id);
}
}
}
三、创建子模块，服务消费者，cloud-consumer-order80
1. 编写 POM 文件
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
2. 编写 yml，启动类
yml
server:
port: 80
spring:
application:
name: cloud-consumer-order80
启动类
package com.atguigu.springcloud;
import com.atguigu.myrule.MySelfRule;
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;
@SpringBootApplication
public class OrderMain80 {
public static void main(String[] args) {
SpringApplication.run(OrderMain80.class, args);
}
}
3. 编写实体类 entities
将cloud-provider-payment8001工程下的entities包下的两个实体类复制过来
4. 编写 RestTemplate 配置类
package com.atguigu.springcloud.config;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;
@SpringBootConfiguration
public class ApplicationContextConfig {
@Bean
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}
5. 创建 Controller
package com.atguigu.springcloud.controller;
import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
@RestController
@Slf4j
@RequestMapping("/consumer")
public class OrderController {
public static final String PAYMENT_URL = "http://localhost:8001/payment";
@Resource
private RestTemplate restTemplate;
@PostMapping("/payment/create")
public CommonResult<Payment> create(@RequestBody Payment payment){
// 请求 url，请求体数据，响应数据类型
return restTemplate.postForObject(PAYMENT_URL + "/create", payment, CommonResult.class);
}
@GetMapping("/payment/get/{id}")
public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id){
return restTemplate.getForObject(PAYMENT_URL + "/get/" + id, CommonResult.class);
}
}
6. 进行远程过程调用测试
四、项目重构
1. 新建子模块，cloud-api-commons
将 payment8001 中 entities 复制到 cloud-api-commons
2. 添加 POM 依赖
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.1.0</version>
</dependency>
</dependencies>
3. 在 Maven 管理界面，跳过单元测试，执行 mvn:install 命令
4. 为 payment，order 工程添加依赖
<dependency>
<!-- 自己项目的用户组 -->
<groupId>com.atguigu</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>${project.version}</version>
</dependency>
五、创建子模块，服务注册中心，cloud-eureka-server7001
1. 添加 POM 依赖
<dependencies>
<!-- 服务注册中心 Server 端 -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<dependency>
<groupId>com.atguigu</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</dependency>
</dependencies>
2. 编写 yml，启动类
yml
server:
port: 7001
eureka:
instance:
hostname: localhost
client:
register-with-eureka: false # 是否想服务注册中心注册，本身就是无需注册
fetchRegistry: false # 是否获取已经注册的服务列表
service-url:
defaultZone: http://localhost:7001/eureka
启动类
package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer // 注解开启 EurekaServer 功能
public class EruekaApplication {
public static void main(String[] args) {
SpringApplication.run(EruekaApplication.class, args);
}
}
3. 测试
六、改写服务提供者和消费者
将服务提供者和消费者都注册进 Eureka 中
1. 改写服务提供者
添加 POM 依赖
<!-- Eureka Client -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
添加 yml 配置
eureka:
client:
register-with-eureka: true # 向服务注册中心注册服务
fetchRegistry: false # 获取注册列表信息
service-url:
defaultZone: http://localhost:7001/eureka
在 payment 启动类上，添加注解 “@EnableEurekaClient”
2. 消费者改造
消费者进行同样的改造，将 yml 配置中的 fetchRegistry 改为 true，让消费者可以获取注册列表
记得在启动类上添加注解
添加 Ribbon 负载均衡服务调用
在消费者端添加 Ribbon服务
1. 新建 Ribbon 负载均衡策略配置类
注意：这个配置类不能放在启动类所在的包和子包下
原因： 这个自定义配置类不能放在@ComponentScan所扫描的当前包下以及子包下，否则我们自定义的这个配置类就会被所有的Ribbon客户端所共享，达不到特殊化订制的目的了。
package com.atguigu.myrule;
import com.netflix.loadbalancer.IRule;
import com.netflix.loadbalancer.RandomRule;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class MySelfRule {
@Bean
public IRule myRule(){
return new RandomRule();//定义为随机
}
}
2. 在主启动类上添加 @RibbonClient 注解
@RibbonClient(name = "CLOUD-PAYMENT-SERVER", configuration = MySelfRule.class)
3. 在消费者 RestTemplate 配置类中加上 @LoadBalanced 注解
package com.atguigu.springcloud.config;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;
@SpringBootConfiguration
public class ApplicationContextConfig {
@Bean
@LoadBalanced
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}
- 在 Controller 中将请求的 URL，改为服务名
// 更改之前
public static final String PAYMENT_URL = "http://localhost:8001/payment";
// 更改之后
public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE/payment";
