SpringCloud微服务详细代码块-Eureka

父工程

pom

父工程只有一个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">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.meng</groupId>
  <artifactId>cloud2020</artifactId>
  <version>1.0-SNAPSHOT</version>
  <modules>
      <module>cloud-provider-payment8001</module>
      <module>cloud-consumer-order80</module>
      <module>cloud-api-commons</module>
      <module>cloud-eureka-server7001</module>
      <module>cloud-eureka-server7002</module>
      <module>cloud-provider-payment8002</module>
  </modules>
  <packaging>pom</packaging>


  <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>8.0.21</mysql.version>
    <druid.version>1.1.23</druid.version>
    <mybatis.spring.boot.version>2.1.3</mybatis.spring.boot.version>
  </properties>

  <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>

      <!--junit-->
      <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>${junit.version}</version>
      </dependency>

      <!--log4j-->
      <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>${log4j.version}</version>
      </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>
</project>

公共端口

公共的api在此项目中，主要存放通用的实体类，目的就是为了解耦。

里面只有两个需要用到的实体类

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>cloud2020</artifactId>
        <groupId>com.meng</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>

        <!--hutool工具包-->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.5</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>

</project>

实体类

Payment.java

package com.meng.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.apache.ibatis.type.Alias;

import java.io.Serializable;

/**
 * @author Administrator
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
@Alias("Payment")
public class Payment implements Serializable {
    
    

    private Long id;

    private String serial;
}

CommonResult.java

package com.meng.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @author Administrator
 */
@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);
    }
}

8001端口

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>cloud2020</artifactId>
        <groupId>com.meng</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-provider-payment8001</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.meng</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>

        <!--web-->
        <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>

        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>

        <!--druid-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>

        <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <!--devtool-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <!--lombok-->
        <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>

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

yml

server:
  port: 8001

spring:
  application:
    name: cloud-payment-service
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:8080/spring-cloud-1?useUnicode=true&useSSL=false&characterEncoding=utf-8
    username: root
    password: 123456

mybatis:
  type-aliases-package: com.meng.entity
  mapper-locations: classpath:mapper/*.xml

eureka:
  client:
    #表示将自己注册进Eureka Server，默认为true
    register-with-eureka: true
    #是否从Eureka Server抓取已有的注册信息，默认为true
    fetchRegistry: true
    service-url:
      #defaultZone: http://localhost:7001/eureka/  #单机版
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/
  instance:
    instance-id: payment8001 #修改主机名
    prefer-ip-address: true #访问路径可以显示IP地址
    #lease-renewal-interval-in-seconds: 1 #Eureka客户端向服务端发送心跳的时间间隔，默认是30秒
    #lease-expiration-duration-in-seconds: 2 #Eureka服务端在收到最后一次心跳后的等待时间上限，默认是90秒

主启动类

PaymentMain8001.java

package com.meng;

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;

/**
 * @author Administrator
 */
@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
public class PaymentMain8001 {
    
    
    public static void main(String[] args) {
    
    
        SpringApplication.run(PaymentMain8001.class,args);
    }
}

mapper

PaymentMapper.java接口

package com.meng.mapper;

import com.meng.entity.Payment;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

/**
 * @author Administrator
 */
@Mapper
public interface PaymentMapper {
    
    

    /**
     * 新增
     * @param payment
     * @return
     */
    int create(Payment payment);

    /**
     * 按id查询
     * @param id
     * @return
     */
    Payment getPaymentById(@Param("id")Long id);
}

PaymentMapper.xml实现

<?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.meng.mapper.PaymentMapper">
    <insert id="create" parameterType="Payment" useGeneratedKeys="true" keyProperty="id">
        insert into payment(serial)
        values (#{serial})
    </insert>

    <resultMap id="BaseResultMap" type="Payment">
        <result property="id" column="id" jdbcType="BIGINT"></result>
        <result property="serial" column="serial" jdbcType="VARCHAR"></result>
    </resultMap>
    <select id="getPaymentById" parameterType="Long" resultMap="BaseResultMap">
        select *
        from payment
        where id=#{id}
    </select>
</mapper>

service层

PaymentService.java接口

package com.meng.service;

import com.meng.entity.Payment;
import org.apache.ibatis.annotations.Param;

/**
 * @author Administrator
 */
public interface PaymentService {
    
    
    /**
     * 新增
     * @param payment
     * @return
     */
    int create(Payment payment);

    /**
     * 按id查询
     * @param id
     * @return
     */
    Payment getPaymentById(@Param("id")Long id);
}

PaymentServiceImpl.java实现

package com.meng.service.impl;

import com.meng.entity.Payment;
import com.meng.mapper.PaymentMapper;
import com.meng.service.PaymentService;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

/**
 * @author Administrator
 */
@Service
public class PaymentServiceImpl implements PaymentService {
    
    

    @Resource
    private PaymentMapper paymentMapper;

    @Override
    public int create(Payment payment) {
    
    
        return paymentMapper.create(payment);
    }

    @Override
    public Payment getPaymentById(Long id) {
    
    
        return paymentMapper.getPaymentById(id);
    }
}

controller层

PaymentController.java

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package com.meng.controller;

import com.meng.entity.CommonResult;
import com.meng.entity.Payment;
import com.meng.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;

/**
 * @author Administrator
 */
@RestController
@Slf4j
public class PaymentController {
    
    

    @Resource
    private PaymentService paymentService;

    @Resource
    private DiscoveryClient discoveryClient;

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

    @PostMapping("/payment/create")
    public CommonResult create(@RequestBody Payment payment){
    
    
        int result=paymentService.create(payment);
        log.info("*****插入结果："+result);

        if (result>0){
    
    
            return new CommonResult(200,"插入数据库成功,serverPort:"+serverPort,result);
        }else {
    
    
            return new CommonResult(444,"插入数据库失败");
        }
    }

    @GetMapping("/payment/getPaymentById/{id}")
    public CommonResult 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(444,"没有对应记录，查询ID："+id+"失败");
        }
    }

    /**
     * 服务发现Discovery
     * @return
     */
    @GetMapping("/payment/discovery")
    public Object discovery(){
    
    

        List<String> services = discoveryClient.getServices();
        for (String element : services) {
    
    
            log.info("*****element:"+element);
        }

        List<ServiceInstance> instances = discoveryClient.getInstances("cloud-payment-service");
        for (ServiceInstance instance : instances) {
    
    
            log.info(instance.getServiceId()+"\t"+instance.getHost()+"\t"+instance.getPort()+"\t"+instance.getUri());
        }

        return this.discoveryClient;
    }
}

8002端口

和8001完全一样，就端口号不同，这样做是提供多个服务防止8001挂了

Eureka7001端口

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>cloud2020</artifactId>
        <groupId>com.meng</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-eureka-server7001</artifactId>

    <dependencies>
        <!--引入自定义的api，包括实体类-->
        <dependency>
            <groupId>com.meng</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>

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

        <!--web-->
        <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>

yml

server:
  port: 7001

eureka:
  instance:
    hostname: eureka7001.com
  client:
    #表示不像注册中心注册自己
    register-with-eureka: false
    fetch-registry: false
    #设置与Eureka Server交互的地址，查询服务和注册服务都需要依赖这个地址
    service-url:
      defaultZone: http://eureka7002.com:7002/eureka/
  #server:
    #enable-self-preservation: false #关闭自我保护机制。默认是true不关闭
    #eviction-interval-timer-in-ms: 2000 #设置睡眠时间2000ms

主启动类

EurekaMain7001

package com.meng;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

/**
 * @author Administrator
 */
@SpringBootApplication
@EnableEurekaServer
public class EurekaMain7001 {
    
    
    public static void main(String[] args) {
    
    
        SpringApplication.run(EurekaMain7001.class,args);
    }
}

Eureka7002端口

Eureka7002同7001

客户访问端口80

客户访问端口不进行数据库连接等操作

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>cloud2020</artifactId>
        <groupId>com.meng</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-consumer-order80</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.meng</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>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

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

</project>

yml

server:
  port: 80

spring:
  application:
    name: cloud-order-service


eureka:
  client:
    #表示将自己注册进Eureka Server，默认为true
    register-with-eureka: true
    #是否从Eureka Server抓取已有的注册信息，默认为true
    fetchRegistry: true
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/
  instance:
    instance-id: order80 #修改主机名
    prefer-ip-address: true #访问路径可以显示IP地址

主启动类

OrderMain80.java

package com.meng;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

/**
 * @author Administrator
 */
@SpringBootApplication
@EnableEurekaClient
public class OrderMain80 {
    
    
    public static void main(String[] args) {
    
    
        SpringApplication.run(OrderMain80.class,args);
    }
}

配置类

ApplicationContextConfig.java

package com.meng.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;

/**
 * @author Administrator
 */
@Configuration
public class ApplicationContextConfig {
    
    

    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate(){
    
    
        return new RestTemplate();
    }
}

controller层

OrderController.java

package com.meng.controller;

import com.meng.entity.CommonResult;
import com.meng.entity.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.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

/**
 * @author Administrator
 */
@RestController
@Slf4j
public class OrderController {
    
    

    public static  final String PAYMENT_URL="http://cloud-payment-service";

    @Resource
    private RestTemplate restTemplate;

    @GetMapping("/consumer/payment/create")
    public CommonResult<Payment> create(Payment payment){
    
    
        return restTemplate.postForObject(PAYMENT_URL+"/payment/create",payment,CommonResult.class);
    }

    @GetMapping("/consumer/payment/getPaymentById/{id}")
    public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id){
    
    
        return restTemplate.getForObject(PAYMENT_URL+"/payment/getPaymentById/"+id,CommonResult.class);
    }
}

额外

此外，还要修改hosts文件，改变dns

文件地址C:\Windows\System32\drivers\etc

修改dns如下

# localhost name resolution is handled within DNS itself.
	127.0.0.1	eureka7001.com
	127.0.0.1	eureka7002.com
	127.0.0.1	localhost

然后cmd下ipconfig/flushdns命令清空缓存，即可通过http://eureka7001.com:7001/eureka/访问