1. Introduction
| technology | Version |
|---|---|
| Spring Cloud version | Hoxton.SR1 |
| Spring Boot version | 2.2.2RELEASE |
| Cloud Alibaba version | 2.1.0.RELEASE |
official address
git address:https://github.com/spring-projects/spring-boot/releases/
Spring Boot official website:https://spring.io/projects/spring-boot
git address:https://github.com/spring-projects/spring-cloud
Spring Boot official website:https://spring.io/projects/spring-cloud
Version of Spring Cloud
Spring Cloud is named after the London subway station in England, and iterative versions are released in the form of subway station names AZ and so on. Spring Cloud is a comprehensive project composed of many sub-projects, and each sub-project has a different release rhythm. In order to manage the version dependencies between SpringCloud and each sub-project, a list is released, which includes the sub-project version corresponding to a SpringCloud version. In order to avoid confusion between the SpringCloud version number and the sub-project version number, the SpringCloud version uses a name instead of a version number. The names of these versions use the names of London subway stations, and correspond to the version time sequence according to the order of the alphabet. For example, Angel is the first version, and Brixton is the second version. When the release content of SpringCloud reaches a critical point or a major bug is resolved, a "service releases" version, SRX version for short, will be released. For example, Greenwich.SR2 is the second SRX version of the Greenwich version released by SpringCloud.
1. The relationship between SpringBoot and SpringCloud
website:https://spring.io/projects/spring-cloud#overview
A more detailed version of the viewing address:https://start.spring.io/actuator/info
{
"git":{
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"commit":{
"id":"64b2829",
"time":"2023-02-13T11:11:29Z"
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"build":{
"version":"0.0.1-SNAPSHOT",
"artifact":"start-site",
"versions":{
"spring-boot":"3.0.2",
"initializr":"0.20.0-SNAPSHOT"
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"name":"start.spring.io website",
"time":"2023-02-13T11:12:37.946Z",
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"bom-ranges":{
"codecentric-spring-boot-admin":{
"2.4.3":"Spring Boot >=2.3.0.M1 and <2.5.0-M1",
"2.5.6":"Spring Boot >=2.5.0.M1 and <2.6.0-M1",
"2.6.8":"Spring Boot >=2.6.0.M1 and <2.7.0-M1",
"2.7.4":"Spring Boot >=2.7.0.M1 and <3.0.0-M1",
"3.0.0-M4":"Spring Boot >=3.0.0-M1 and <3.1.0-M1"
},
"solace-spring-boot":{
"1.1.0":"Spring Boot >=2.3.0.M1 and <2.6.0-M1",
"1.2.2":"Spring Boot >=2.6.0.M1 and <3.0.0-M1"
},
"solace-spring-cloud":{
"1.1.1":"Spring Boot >=2.3.0.M1 and <2.4.0-M1",
"2.1.0":"Spring Boot >=2.4.0.M1 and <2.6.0-M1",
"2.3.2":"Spring Boot >=2.6.0.M1 and <3.0.0-M1"
},
"spring-cloud":{
"Hoxton.SR12":"Spring Boot >=2.2.0.RELEASE and <2.4.0.M1",
"2020.0.6":"Spring Boot >=2.4.0.M1 and <2.6.0-M1",
"2021.0.0-M1":"Spring Boot >=2.6.0-M1 and <2.6.0-M3",
"2021.0.0-M3":"Spring Boot >=2.6.0-M3 and <2.6.0-RC1",
"2021.0.0-RC1":"Spring Boot >=2.6.0-RC1 and <2.6.1",
"2021.0.5":"Spring Boot >=2.6.1 and <3.0.0-M1",
"2022.0.0-M1":"Spring Boot >=3.0.0-M1 and <3.0.0-M2",
"2022.0.0-M2":"Spring Boot >=3.0.0-M2 and <3.0.0-M3",
"2022.0.0-M3":"Spring Boot >=3.0.0-M3 and <3.0.0-M4",
"2022.0.0-M4":"Spring Boot >=3.0.0-M4 and <3.0.0-M5",
"2022.0.0-M5":"Spring Boot >=3.0.0-M5 and <3.0.0-RC1",
"2022.0.0-RC1":"Spring Boot >=3.0.0-RC1 and <3.0.0-RC2",
"2022.0.0-RC2":"Spring Boot >=3.0.0-RC2 and <3.0.0",
"2022.0.1":"Spring Boot >=3.0.0 and <3.1.0-M1"
},
"spring-cloud-azure":{
"4.6.0":"Spring Boot >=2.5.0.M1 and <3.0.0-M1",
"5.0.0":"Spring Boot >=3.0.0-M1 and <3.1.0-M1"
},
"spring-cloud-gcp":{
"2.0.11":"Spring Boot >=2.4.0-M1 and <2.6.0-M1",
"3.4.3":"Spring Boot >=2.6.0-M1 and <3.0.0-M1",
"4.0.0":"Spring Boot >=3.0.0-M1 and <3.1.0-M1"
},
"spring-cloud-services":{
"2.3.0.RELEASE":"Spring Boot >=2.3.0.RELEASE and <2.4.0-M1",
"2.4.1":"Spring Boot >=2.4.0-M1 and <2.5.0-M1",
"3.3.0":"Spring Boot >=2.5.0-M1 and <2.6.0-M1",
"3.4.0":"Spring Boot >=2.6.0-M1 and <2.7.0-M1",
"3.5.0":"Spring Boot >=2.7.0-M1 and <3.0.0-M1",
"4.0.0":"Spring Boot >=3.0.0 and <3.1.0-M1"
},
"spring-shell":{
"2.1.6":"Spring Boot >=2.7.0 and <3.0.0-M1",
"3.0.0":"Spring Boot >=3.0.0 and <3.1.0-M1"
},
"vaadin":{
"14.9.6":"Spring Boot >=2.1.0.RELEASE and <2.6.0-M1",
"23.2.15":"Spring Boot >=2.6.0-M1 and <2.7.0-M1",
"23.3.5":"Spring Boot >=2.7.0-M1 and <2.8.0-M1"
},
"wavefront":{
"2.0.2":"Spring Boot >=2.1.0.RELEASE and <2.4.0-M1",
"2.1.1":"Spring Boot >=2.4.0-M1 and <2.5.0-M1",
"2.2.2":"Spring Boot >=2.5.0-M1 and <2.7.0-M1",
"2.3.4":"Spring Boot >=2.7.0-M1 and <3.0.0-M1",
"3.0.1":"Spring Boot >=3.0.0-M1 and <3.1.0-M1"
}
},
"dependency-ranges":{
"okta":{
"1.4.0":"Spring Boot >=2.2.0.RELEASE and <2.4.0-M1",
"1.5.1":"Spring Boot >=2.4.0-M1 and <2.4.1",
"2.0.1":"Spring Boot >=2.4.1 and <2.5.0-M1",
"2.1.6":"Spring Boot >=2.5.0-M1 and <3.0.0-M1",
"3.0.2":"Spring Boot >=3.0.0-M1 and <3.1.0-M1",
"managed":"Spring Boot >=3.1.0-M1"
},
"mybatis":{
"2.1.4":"Spring Boot >=2.1.0.RELEASE and <2.5.0-M1",
"2.2.2":"Spring Boot >=2.5.0-M1 and <2.7.0-M1",
"2.3.0":"Spring Boot >=2.7.0-M1 and <3.0.0-M1",
"3.0.0":"Spring Boot >=3.0.0-M1"
},
"camel":{
"3.5.0":"Spring Boot >=2.3.0.M1 and <2.4.0-M1",
"3.10.0":"Spring Boot >=2.4.0.M1 and <2.5.0-M1",
"3.13.0":"Spring Boot >=2.5.0.M1 and <2.6.0-M1",
"3.17.0":"Spring Boot >=2.6.0.M1 and <2.7.0-M1",
"3.20.2":"Spring Boot >=2.7.0.M1 and <3.0.0-M1",
"4.0.0-M1":"Spring Boot >=3.0.0-M1 and <3.1.0-M1"
},
"picocli":{
"4.7.0":"Spring Boot >=2.5.0.RELEASE and <3.1.0-M1"
},
"open-service-broker":{
"3.2.0":"Spring Boot >=2.3.0.M1 and <2.4.0-M1",
"3.3.1":"Spring Boot >=2.4.0-M1 and <2.5.0-M1",
"3.4.1":"Spring Boot >=2.5.0-M1 and <2.6.0-M1",
"3.5.0":"Spring Boot >=2.6.0-M1 and <2.7.0-M1"
}
}
}
2. Regarding the suspension/upgrade/replacement of various components of Cloud
Official website:https://cloud.spring.io/spring-cloud-static/Hoxton.SR1/reference/htmlsingle/
Official website:https://docs.spring.io/spring-boot/docs/2.2.2.RELEASE/reference/htmlsingle/
Spring Cloud Chinese documentation:https://www.bookstack.cn/read/spring-cloud-docs/docs-index.md
After upgrade:
3. Code construction of microservice architecture (cloud-provider-payment8001)
3.1 pom file
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>springcloud</artifactId>
<groupId>com.yyds</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-provider-payment8001</artifactId>
<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>1.1.22</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>
</dependency>
</dependencies>
</project>
3.2 Change the yml file
server:
port: 8001
spring:
application:
name: cloud-payment-service
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/springcloud?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: root
mybatis:
mapper-locations: classpath:mapper/*.xml
type-aliases-package: com.yyds.springcloud.entities
3.3 Main Boot
package com.yyds.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class PaymentMain8001 {
public static void main(String[] args) {
SpringApplication.run(PaymentMain8001.class, args);
System.out.println("*******************PaymentMain8001启动成功********************");
}
}
3.4 Business class
3.4.1 dao and mapper.xml
package com.yyds.springcloud.dao;
import com.yyds.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
@Mapper
public interface PaymentDao {
int create(Payment payment);
Payment getPaymentById(@Param("id") Long id);
}
<?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.yyds.springcloud.dao.PaymentDao">
<resultMap id="BaseResultMap" type="payment">
<result column="id" property="id"/>
<result column="serial" property="serial"/>
</resultMap>
<insert id="create" parameterType="Payment" useGeneratedKeys="true" keyProperty="id">
insert into payment (serial) value (#{serial});
</insert>
<select id="getPaymentById" parameterType="Long" resultMap="BaseResultMap">
select * from payment where id = #{id}
</select>
</mapper>
3.4.2 service
package com.yyds.springcloud.service;
import com.yyds.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Param;
public interface PaymentService {
int create(Payment payment);
Payment getPaymentById(@Param("id") Long id);
}
package com.yyds.springcloud.service.impl;
import com.yyds.springcloud.dao.PaymentDao;
import com.yyds.springcloud.entities.Payment;
import com.yyds.springcloud.service.PaymentService;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@Service
public class PaymentServiceImpl implements PaymentService {
@Resource
private PaymentDao paymentDao;
@Override
public int create(Payment payment) {
return paymentDao.create(payment);
}
@Override
public Payment getPaymentById(Long id) {
return paymentDao.getPaymentById(id);
}
}
3.4.3 controller
package com.yyds.springcloud.controller;
import com.yyds.springcloud.entities.CommonResult;
import com.yyds.springcloud.entities.Payment;
import com.yyds.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
@RestController
@RequestMapping("/payment")
@Slf4j
public class PaymentController {
@Resource
private PaymentService paymentService;
@PostMapping("/create")
public CommonResult<Payment> create(@RequestBody Payment payment){
int result = paymentService.create(payment);
if(result > 0){
return new CommonResult(200,"插入数据库成功",result);
}else {
return new CommonResult(444,"插入数据库失败",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(200,"没有对应id",null);
}
}
}
3.4.4 Entity class
package com.yyds.springcloud.entities;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T>{
private Integer code;
private String message;
private T data;
public CommonResult(Integer code, String message) {
this(code,message,null);
}
}
package com.yyds.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;
}
4、cloud-consumer-order80
RestTemplate provides a variety of convenient methods for accessing remote Http services. It is a simple and convenient way to access restful service template classes. It is a client template tool set provided by Spring for accessing Rest services.
- Official website address
https://docs.spring.io/spring-framework/docs/5.2.2.RELEASE/javadoc-api/org/springframework/web/client/RestTemplate.html
- use
Using restTemplate to access the restful interface is very simple and rude. (url, requestMap, ResponseBean.class) These three parameters respectively represent
the REST request address, request parameters, and the object type converted into the HTTP response conversion.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>springcloud</artifactId>
<groupId>com.yyds</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-consumer-order80</artifactId>
<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>
</project>
- config configuration class
package com.yyds.springcloud.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
@Configuration
public class ApplicationContextConfig {
@Bean
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}
package com.yyds.springcloud.controller;
import com.yyds.springcloud.entities.CommonResult;
import com.yyds.springcloud.entities.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
@RestController
@RequestMapping("/consumer/payment")
@Slf4j
public class OrderController {
public static final String PAYMENT_URL = "http://localhost:8001";
@Resource
private RestTemplate restTemplate;
@GetMapping("/create")
public CommonResult<Payment> create(Payment payment) {
return restTemplate.postForObject(PAYMENT_URL +"/payment/create",payment,CommonResult.class);
}
@GetMapping("/get/{id}")
public CommonResult<Payment> getPayment(@PathVariable("id") Long id) {
return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
}
}
test
# 服务之间的调用
http://localhost/consumer/payment/get/10
{
"code":200,"message":"查询成功","data":{
"id":10,"serial":"11111"}}
http://localhost/consumer/payment/create?serial=6666
{
"code":200,"message":"插入数据库成功","data":1}
engineering reconstruction
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>springcloud</artifactId>
<groupId>com.yyds</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-api-commons</artifactId>
<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>
</project>
# 安装cloud-api-commons到本地
mvn clean
mvn install
Delete the entity class package in the two microservice modules, and then add the following configuration in the pom files of the two modules
<!--引入自己定义的api通用包-->
<dependency>
<groupId>com.yyds</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
2. Eureka service registration and discovery
2.1 Introduction
2.1.1 What is Service Governance
Spring Cloud encapsulates the Eureka module developed by Netflix to implement service governance
In the traditional rpc remote call framework, it is more complicated to manage the dependencies between each service and the management, so it is necessary to use service governance to manage the dependencies between services and services, which can realize service calls, load balancing, Fault tolerance, etc., realize service discovery and registration.
2.2.2 What is service registration and discovery
Eureka adopts the design architecture of CS. Eureka Server is the server of the service registration function, which is the service registration center. Other microservices in the system use Eureka's client to connect to Eureka Server and maintain a heartbeat connection. In this way, system maintainers can use Eureka Server to monitor whether each microservice in the system is running normally.
In service registration and discovery, there is a registration center. When the server starts, it will register the information of the current server, such as the service address and mailing address, to the registration center in the form of an alias. The other party (consumer | service provider) uses the alias to obtain the actual service communication address from the registration center, and then realizes the local RPC call RPC remote call framework. The core design idea: lies in the registration center, because the use of the registration center Manage each service and a dependency between services (service governance concept). In any rpc remote framework, there will be a registration center (store service address related information (interface address))
2.2.3 Two components of Eureka
Eureka Server提供服务注册服务
After each microservice node is configured and started, it will be registered in EurekaServer, so that the service registry in EurekaServer will store the information of all available service nodes, and the information of service nodes can be seen directly in the interface.
EurekaClient通过注册中心进行访问
It is a Java client that simplifies the interaction with Eureka Server. The client also has a built-in load balancer that uses a round-robin load algorithm. After the application starts, a heartbeat will be sent to Eureka Server (the default period is 30 seconds). If Eureka Server does not receive a node's heartbeat within multiple heartbeat cycles, EurekaServer will remove the service node from the service registry (default 90 seconds)
2.2 Construction of stand-alone Eureka
Module name: cloud-eureka-server7001
2.2.1 The pom file is as follows
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>springcloud</artifactId>
<groupId>com.yyds</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-eureka-server7001</artifactId>
<dependencies>
<!--eureka-server-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<!-- 引入自己定义的api通用包，可以使用Payment支付Entity -->
<dependency>
<groupId>com.yyds</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<!--boot web actuator-->
<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>
<!--一般通用配置-->
<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>
</project>
2.2.2 yml file
server:
port: 7001
eureka:
instance:
hostname: localhost #eureka服务端的实例名称
client:
register-with-eureka: false #false表示不向注册中心注册自己。
fetch-registry: false #false表示自己端就是注册中心，我的职责就是维护服务实例，并不需要去检索服务
service-url:
defaultZone: http://localhost:7001/eureka
2.2.3 Main startup class
package com.yyds.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
// 添加此注解
@EnableEurekaServer
public class EurekaMain7001 {
public static void main(String[] args) {
SpringApplication.run(EurekaMain7001.class, args);
System.out.println("************EurekaMain7001启动成功******************");
}
}
Start the eureka test
http://localhost:7001/
2.2.4 Payment microservice cloud-provider-payment8001 register Eureka
EurekaClient cloud-provider-payment8001 will be registered into EurekaServer to become a service provider provider.
2.2.4.1 Change the pom file
<!--添加eureka-client-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
2.2.4.2 Write yml file
# 添加下面配置信息
eureka:
client:
service-url:
defaultZone: http://localhost:7001/eureka/
register-with-eureka: true
fetch-registry: true
2.2.4.3 Modify the main startup class
package com.yyds.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
// 添加此注解
@EnableEurekaClient
public class PaymentMain8001 {
public static void main(String[] args) {
SpringApplication.run(PaymentMain8001.class, args);
System.out.println("*******************PaymentMain8001启动成功********************");
}
}
Restart, refresh the Eureka page
2.2.5 Order microservice cloud-consumer-order80 register Eureka
EurekaClient cloud-consumer-order80 will be registered into EurekaServer to become a service consumer consumer.
2.2.5.1 Change the pom file
<!--添加eureka-client-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
2.2.5.2 Write yml file
server:
port: 80
spring:
application:
name: cloud-order-service
# 添加下面配置信息
eureka:
client:
service-url:
defaultZone: http://localhost:7001/eureka/
register-with-eureka: true
fetch-registry: true
2.2.5.3 Modify the main startup class
package com.yyds.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
public class OrderMain80 {
public static void main(String[] args) {
SpringApplication.run(OrderMain80.class, args);
System.out.println("***************OrderMain80启动成功********************");
}
}
Restart, refresh the Eureka page
2.3 Construction of cluster Eureka
If your registration center has only one, if it fails, the entire service environment will be unavailable, so you need to build a Eureka registration center cluster to achieve load balancing + fault tolerance.
2.3.1 New module cloud-eureka-server7002
Refer to cloud-eureka-server7001 to create a new module cloud-eureka-server7002
2.3.2 modify hosts
C:\Windows\System32\drivers\etcAdd in the hosts file under the path
127.0.0.1 eureka7001.com
127.0.0.1 eureka7002.com
2.3.3 Modify the yml file
server:
port: 7001
eureka:
instance:
hostname: eureka7001.com #eureka服务端的实例名称
client:
register-with-eureka: false #false表示不向注册中心注册自己。
fetch-registry: false #false表示自己端就是注册中心，我的职责就是维护服务实例，并不需要去检索服务
service-url:
#集群指向其它eureka
defaultZone: http://eureka7002.com:7002/eureka/
server:
port: 7002
eureka:
instance:
hostname: eureka7002.com #eureka服务端的实例名称
client:
register-with-eureka: false #false表示不向注册中心注册自己。
fetch-registry: false #false表示自己端就是注册中心，我的职责就是维护服务实例，并不需要去检索服务
service-url:
#集群指向其它eureka
defaultZone: http://eureka7001.com:7001/eureka/
2.3.4 Modify the yml file of payment module and order module
server:
port: 8001
spring:
application:
name: cloud-payment-service
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/springcloud?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: root
mybatis:
mapper-locations: classpath:mapper/*.xml
type-aliases-package: com.yyds.springcloud.entities
eureka:
client:
service-url:
#defaultZone: http://localhost:7001/eureka
defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka # 集群版本
register-with-eureka: true
fetch-registry: true
server:
port: 80
spring:
application:
name: cloud-order-service
# 添加下面配置信息
eureka:
client:
service-url:
#defaultZone: http://localhost:7001/eureka
defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka # 集群版本
register-with-eureka: true # 是否从EurekaServer抓取已有的注册信息，默认为true。单节点无所谓，集群必须设置为true才能配合ribbon使用负载均衡
fetch-registry: true
2.3.5 Testing
-
First start EurekaServer, 7001/7002 service
-
Then start the service provider provider, 8001
-
To start the consumer again, 80
-
Test port number:
http://localhost/consumer/payment/get/1
2.3.6 Payment module service provider cluster configuration
Refer to cloud-provider-payment8001 to create a new cloud-provider-payment8002 module
And add the server.port attribute to the controllers of the two modules to facilitate testing
package com.yyds.springcloud.controller;
import com.yyds.springcloud.entities.CommonResult;
import com.yyds.springcloud.entities.Payment;
import com.yyds.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
@RestController
@RequestMapping("/payment")
@Slf4j
public class PaymentController {
@Resource
private PaymentService paymentService;
@Value("${server.port}")
private String serverPort;
@PostMapping("/create")
public CommonResult<Payment> create(@RequestBody Payment payment){
int result = paymentService.create(payment);
if(result > 0){
return new CommonResult(200,"插入数据库成功,serverPort+" + serverPort ,result);
}else {
return new CommonResult(444,"插入数据库失败",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,serverPort+" + serverPort,payment);
}else {
return new CommonResult(200,"没有对应id",null);
}
}
}
You can see the following page from Eureka
accesshttp://localhost/consumer/payment/get/1
At this time, it is found that they are all accessing the 8001 service
{
"code":200,"message":"查询成功,serverPort+8001","data":{
"id":1,"serial":"00001a"}}
Modify the order microservice interface
package com.yyds.springcloud.controller;
import com.yyds.springcloud.entities.CommonResult;
import com.yyds.springcloud.entities.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
@RestController
@RequestMapping("/consumer/payment")
@Slf4j
public class OrderController {
// public static final String PAYMENT_URL = "http://localhost:8001";
public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";
@Resource
private RestTemplate restTemplate;
@GetMapping("/create")
public CommonResult<Payment> create(Payment payment) {
return restTemplate.postForObject(PAYMENT_URL +"/payment/create",payment,CommonResult.class);
}
@GetMapping("/get/{id}")
public CommonResult<Payment> getPayment(@PathVariable("id") Long id) {
return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
}
}
At this time, when visiting http://localhost/consumer/payment/get/1, the following exception will be reported java.net.UnknownHostException: CLOUD-PAYMENT-SERVICE.
Need to modify the configuration class
package com.yyds.springcloud.config;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
@Configuration
public class ApplicationContextConfig {
@Bean
@LoadBalanced // 添加此注解
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}
At this point, load balancing will be performed
{
"code":200,"message":"查询成功,serverPort+8002","data":{
"id":1,"serial":"00001a"}}
{
"code":200,"message":"查询成功,serverPort+8001","data":{
"id":1,"serial":"00001a"}}
2.4 More usage
2.4.1 Actuator microservice information improvement
Host name: service name modification
eureka:
client:
service-url:
#defaultZone: http://localhost:7001/eureka
defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka # 集群版本
register-with-eureka: true
fetch-registry: true
# 添加此配置
instance:
instance-id: payment8001
eureka:
client:
service-url:
#defaultZone: http://localhost:7001/eureka
defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka # 集群版本
register-with-eureka: true
fetch-registry: true
# 添加此配置
instance:
instance-id: payment8002
Access information has IP information prompt
eureka:
client:
service-url:
#defaultZone: http://localhost:7001/eureka
defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka # 集群版本
register-with-eureka: true
fetch-registry: true
instance:
instance-id: payment8001
prefer-ip-address: true # 显示ip
eureka:
client:
service-url:
#defaultZone: http://localhost:7001/eureka
defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka # 集群版本
register-with-eureka: true
fetch-registry: true
instance:
instance-id: payment8002
prefer-ip-address: true # 显示ip
2.4.2 Service discovery Discovery
For microservices registered in eureka, information about the service can be obtained through service discovery.
package com.yyds.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
// 添加此注解
@EnableEurekaClient
// 添加此注解
@EnableDiscoveryClient
public class PaymentMain8001 {
public static void main(String[] args) {
SpringApplication.run(PaymentMain8001.class, args);
System.out.println("*******************PaymentMain8001启动成功********************");
}
}
@Resource
private DiscoveryClient discoveryClient;
@GetMapping("/discovery")
public Object discovery(){
// 服务清单列表
List<String> services = discoveryClient.getServices();
for (String service : services) {
log.info("******************service:"+service);
}
List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
for (ServiceInstance instance : instances) {
String host = instance.getHost();
String serviceId = instance.getServiceId();
URI uri = instance.getUri();
int port = instance.getPort();
log.info(serviceId + "\t" + host + "\t"+ port+ "\t" + uri );
}
return this.discoveryClient;
}
testhttp://localhost:8001/payment/discovery
{
"services":["cloud-payment-service","cloud-order-service"],"order":0}
******************service:cloud-payment-service
******************service:cloud-order-service
CLOUD-PAYMENT-SERVICE 192.168.42.2 8002 http://192.168.42.2:8002
CLOUD-PAYMENT-SERVICE 192.168.42.2 8001 http://192.168.42.2:8001
2.4.3 Eureka self-protection
- What is Self-Defense Mode?
By default, if EurekaServer does not receive the heartbeat of a microservice instance within a certain period of time, EurekaServer will log off the instance (90 seconds by default). However, when a network partition failure occurs (delay, freeze, congestion), the normal communication between the microservice and EurekaServer may not be possible, and the above behavior may become very dangerous - because the microservice itself is actually healthy, and it is not at this time. This microservice should be unregistered. Eureka solves this problem through the "self-protection mode"-when the EurekaServer node loses too many clients in a short period of time (a network partition failure may occur), then this node will enter the self-protection mode.
- Why is there a Eureka self-protection mechanism?
In order to prevent EurekaClient from running normally, but EurekaServer will not remove the EurekaClient service immediately if the network is not connected to EurekaServer
In self-protection mode, Eureka Server will protect the information in the service registry and no longer log out any service instances. Its design philosophy is 宁可保留错误的服务注册信息，也不盲目注销任何可能健康的服务实例.
- no self-protection
eureka:
instance:
hostname: eureka7001.com #eureka服务端的实例名称
client:
register-with-eureka: false #false表示不向注册中心注册自己。
fetch-registry: false #false表示自己端就是注册中心，我的职责就是维护服务实例，并不需要去检索服务
service-url:
#集群指向其它eureka
defaultZone: http://eureka7002.com:7002/eureka/
#单机就是7001自己
# defaultZone: http://localhost:7001/eureka
server:
#关闭自我保护机制，保证不可用服务被及时踢除
enable-self-preservation: false
eviction-interval-timer-in-ms: 2000
server:
port: 8001
###服务名称(服务注册到eureka名称)
spring:
application:
name: cloud-provider-payment
eureka:
client: #服务提供者provider注册进eureka服务列表内
service-url:
register-with-eureka: true
fetch-registry: true
# cluster version
#defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka
# singleton version
defaultZone: http://eureka7001.com:7001/eureka
#心跳检测与续约时间
#开发时设置小些，保证服务关闭后注册中心能即使剔除服务
instance:
#Eureka客户端向服务端发送心跳的时间间隔，单位为秒(默认是30秒)
lease-renewal-interval-in-seconds: 1
#Eureka服务端在收到最后一次心跳后等待时间上限，单位为秒(默认是90秒)，超时将剔除服务
lease-expiration-duration-in-seconds: 2
After closing 8001, Eureka will remove it.
2.4.4 Eureka stopped updating
https://github.com/Netflix/eureka/wiki
3. Zookeeper service registration and discovery
-
Zookeeper is a distributed coordination tool that can realize the registration center function
-
The zookeeper server replaces the Eureka server, and zk serves as the service registry
3.1 Service provider cloud-provider-payment8004
3.1.1 pom file
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>springcloud</artifactId>
<groupId>com.yyds</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-provider-payment8004</artifactId>
<dependencies>
<!--整合zk客户端-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
<!--先排除自带的zookeeper3.5.3-->
<exclusions>
<exclusion>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
</exclusion>
</exclusions>
</dependency>
<!--添加自己安装的zookeeper3.4.6集群-->
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.6</version>
<!-- 排除日志依赖 不然会日志冲突 -->
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
</exclusion>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
<exclusion>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</exclusion>
</exclusions>
</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>
</dependencies>
</project>
3.1.2 yml file
server:
port: 8004
spring:
application:
name: cloud-payment-service
cloud:
zookeeper:
connect-string: 192.168.42.101:2181,192.168.42.102:2181,192.168.42.103:2181
3.1.3 Main startup class
package com.yyds.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication
//该注解用于向使用consul或者zookeeper作为注册中心时注册服务
@EnableDiscoveryClient
public class PaymentMain8004 {
public static void main(String[] args) {
SpringApplication.run(PaymentMain8004.class, args);
System.out.println("*******************PaymentMain8004启动成功********************");
}
}
3.1.4 Business class
package com.yyds.springcloud.controller;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
@RestController
@RequestMapping("/payment")
@Slf4j
public class PaymentController {
@Value("${server.port}")
private String serverPort;
@GetMapping("/zk")
public String paymentZk(){
return "spring cloud with zk:" + serverPort + "\t" + System.currentTimeMillis();
}
}
3.1.5 Testing
http://localhost:8004/payment/zk
spring cloud with zk:8004 1676560104626
# 在zk中进行查看，发现已经注册上了
[zk: localhost:2181(CONNECTED) 3] ls /services
[cloud-payment-service]
[zk: localhost:2181(CONNECTED) 6] get /services/cloud-payment-service/25db342b-6426-47f5-9bc6-6c084a245723
{
"name":"cloud-payment-service",
"id":"25db342b-6426-47f5-9bc6-6c084a245723",
"address":"DESKTOP-6CM5A7S",
"port":8004,
"sslPort":null,
"payload":{
"@class":"org.springframework.cloud.zookeeper.discovery.ZookeeperInstance",
"id":"application-1",
"name":"cloud-payment-service",
"metadata":{
}
},
"registrationTimeUTC":1676560096304,
"serviceType":"DYNAMIC",
"uriSpec":{
"parts":[
{
"value":"scheme",
"variable":true
},
{
"value":"://",
"variable":false
},
{
"value":"address",
"variable":true
},
{
"value":":",
"variable":false
},
{
"value":"port",
"variable":true
}
]
}
}
注意：当杀掉注册进去的服务，zk会把此服务信息删除。
3.2 service consumer cloud-consumerzk-order80
3.2.1 pom file
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>springcloud</artifactId>
<groupId>com.yyds</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-consumerzk-order80</artifactId>
<dependencies>
<!--整合zk客户端-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
<!--先排除自带的zookeeper3.5.3-->
<exclusions>
<exclusion>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
</exclusion>
</exclusions>
</dependency>
<!--添加zookeeper3.4.6版本-->
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.6</version>
<!-- 排除日志依赖 不然会日志冲突 -->
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
</exclusion>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
<exclusion>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</exclusion>
</exclusions>
</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>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
</project>
3.2.2 yml file
server:
port: 80
spring:
application:
name: cloud-consumer-order
cloud:
zookeeper:
connect-string: 192.168.42.101:2181,192.168.42.102:2181,192.168.42.103:2181
3.2.3 Main Boot
package com.yyds.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class ZkOrderMain80 {
public static void main(String[] args) {
SpringApplication.run(ZkOrderMain80.class, args);
System.out.println("***************ZkOrderMain80启动成功********************");
}
}
3.2.4 Business class
package com.yyds.springcloud.controller;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
@RestController
@RequestMapping("/consumer/zk")
@Slf4j
public class OrderController {
public static final String PAYMENT_URL = "http://cloud-payment-service";
@Resource
private RestTemplate restTemplate;
@GetMapping()
public String paymentInfo() {
return restTemplate.getForObject(PAYMENT_URL +"/payment/zk",String.class);
}
}
package com.yyds.springcloud.config;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
@Configuration
public class ApplicationContextConfig {
@Bean
@LoadBalanced
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}
3.2.5 Testing
http://localhost/consumer/zk
spring cloud with zk:8004 1676562116384
[zk: localhost:2181(CONNECTED) 28] ls /services
[cloud-payment-service, cloud-consumer-order]
[zk: localhost:2181(CONNECTED) 30] get /services/cloud-consumer-order/8d13f36d-0697-4e98-a7f5-8d16169b4588
{
"name":"cloud-consumer-order",
"id":"8d13f36d-0697-4e98-a7f5-8d16169b4588",
"address":"DESKTOP-6CM5A7S",
"port":80,
"sslPort":null,
"payload":{
"@class":"org.springframework.cloud.zookeeper.discovery.ZookeeperInstance",
"id":"application-1",
"name":"cloud-consumer-order",
"metadata":{
}
},
"registrationTimeUTC":1676561841585,
"serviceType":"DYNAMIC",
"uriSpec":{
"parts":[
{
"value":"scheme",
"variable":true
},
{
"value":"://",
"variable":false
},
{
"value":"address",
"variable":true
},
{
"value":":",
"variable":false
},
{
"value":"port",
"variable":true
}
]
}
}
4. Consul service registration and discovery
Consul is an open source distributed service discovery and configuration management system developed by HashiCorp in Go language.
Provides functions such as service governance, configuration center, and control bus in the microservice system. Each of these functions can be used individually as needed, or they can be used together to build a full range of service grids. In short, Consul provides a complete service grid solution.
Official website address:https://www.consul.io/intro/index.html
download link:https://www.consul.io/downloads.html
Chinese document:https://www.springcloud.cc/spring-cloud-consul.html
4.1 Consul installation
The installation is relatively simple, directly unzip, only one exe file
consul --version
# 启动
consul agent -dev
通过以下地址可以访问Consul的首页：http://localhost:8500
4.2 Payment service cloud-providerconsul-payment8006
4.2.1 pom file
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>springcloud</artifactId>
<groupId>com.yyds</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-providerconsul-payment8006</artifactId>
<dependencies>
<!--整合consul-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-consul-discovery</artifactId>
</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>
</dependencies>
</project>
4.2.2 yml file
server:
port: 8006
spring:
application:
name: cloud-provider-payment
cloud:
consul:
host: localhost
port: 8500
discovery:
service-name: ${
spring.application.name}
heartbeat:
enabled: true
4.2.3 Main startup class
package com.yyds.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication
//该注解用于向使用consul或者zookeeper作为注册中心时注册服务
@EnableDiscoveryClient
public class ConsulPaymentMain8006 {
public static void main(String[] args) {
SpringApplication.run(ConsulPaymentMain8006.class, args);
System.out.println("*******************ConsulPaymentMain8006启动成功********************");
}
}
4.2.4 Business class
package com.yyds.springcloud.controller;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/payment")
@Slf4j
public class PaymentController {
@Value("${server.port}")
private String serverPort;
@GetMapping("/consul")
public String paymentZk(){
return "spring cloud with consul:" + serverPort + "\t" + System.currentTimeMillis();
}
}
4.2.5 Testing
http://localhost:8006/payment/consul
spring cloud with consul:8006 1676563822227
4.3 service consumer cloud-consumerconsul-order80
4.3.1 pom
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>springcloud</artifactId>
<groupId>com.yyds</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-consumerconsul-order80</artifactId>
<dependencies>
<!--整合consul-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-consul-discovery</artifactId>
</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>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
</project>
4.3.2 yml
server:
port: 80
spring:
application:
name: cloud-consumer-order
cloud:
consul:
host: localhost
port: 8500
discovery:
service-name: ${
spring.application.name}
heartbeat:
enabled: true
4.3.3 Master Boot
package com.yyds.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class ConsulOrderMain80 {
public static void main(String[] args) {
SpringApplication.run(ConsulOrderMain80.class, args);
System.out.println("***************ConsulOrderMain80启动成功********************");
}
}
4.3.4 Business class
package com.yyds.springcloud.controller;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
@RestController
@RequestMapping("/consumer/consul")
@Slf4j
public class OrderConsulController {
public static final String PAYMENT_URL = "http://cloud-provider-payment";
@Resource
private RestTemplate restTemplate;
@GetMapping()
public String paymentInfo() {
return restTemplate.getForObject(PAYMENT_URL +"/payment/consul",String.class);
}
}
4.3.5 Testing
http://localhost/consumer/consul
spring cloud with consul:8006 1676564785406
