搭建Spring cloud gateway、eureka、provider和invoker环境

1、创建Maven父项目

创建父项目的目的是为了统一依赖管理，pom.xml文件如下：

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
        <!-- 继承父项目 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.1</version>
    </parent>
    <groupId>com.example</groupId>
    <artifactId>clouddemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>
    <name>clouddemo</name>
    <description>clouddemo</description>
    
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>2021.0.3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-commons</artifactId>
        </dependency>
    </dependencies>
    <!-- 所有子模块项目 -->
    <modules>
        <module>provider</module>
        <module>eureka</module>
        <module>invoker</module>
        <module>gateway</module>
    </modules>
    
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

2、创建Eureka应用项目

Maven项目pom.xml

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.example</groupId>
    <artifactId>clouddemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <artifactId>eureka</artifactId>
  <dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
    </dependency>
  </dependencies>
  <name>eureka</name>
  <description>eureka</description>
</project>

Eureka主应用类

package com.example.eureka;

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

@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApp {

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

}

应用配置文件application.yml

server:
  port: 8761
spring:
  application:
    name: eureka-server
eureka:
  instance:
    hostname: localhost
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/ #集群注册中心时，写多个eureka地址，逗号分割
    register-with-eureka: false #不向eureka服务注册自己
    fetch-registry: false #不像Eureka检索服务

3、创建Gateway应用项目

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.example</groupId>
    <artifactId>clouddemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <artifactId>gateway</artifactId>
  <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>
  <name>gateway</name>
  <description>gateway</description>
</project>

创建Gateway主应用类

package com.example.gateway;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class GatewayApp {

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

}

application.yml文件配置

server:
  port: 9000

eureka:
  client:
    service-url:
      register-with-eureka: true
      fetch-registry: true
      defaultZone: http://localhost:8761/eureka/

spring:
  application:
    name: gateway
  cloud:
    gateway:
      routes:
      - id: invoker-service
        uri: lb://invoker
        predicates:
        - Path=/invoker-service/**
        filters:
        - StripPrefix=1
      discovery:
        locator:
          enabled: true #启用Eureka默认路由，以大小应用名为服务rul前缀

完成Eureka和Gateway应用配置创建后，可以启动相关相关服务，然后用浏览器访问http://localhost:8761，检验Gateway应用是否成功与Eureka通讯。如果在应用内部中能看到名称为GATEWAY的应用，说明相关应用分配在成功。

4、创建provider应用

pom.xml：

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>clouddemo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <artifactId>provider</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>
    <name>provider</name>
    <description>provider</description>
</project>

主应用类：

package com.example.provider;

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

@EnableEurekaClient
@SpringBootApplication
public class ProviderApp {

    public static void main(String[] args) {
        SpringApplication application = new SpringApplication(ProviderApp.class);
        application.run(args);
    }
}

服务提供方controler类

package com.example.provider.hello.ctrler;

import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/helloDemo")
public class HelloDemoCtrler {
    @PostMapping("/sayHello.do")
    public String sayHello() {
        return "Hello world!中文是否正常？";
    }
}

application.yml

server:
  port: 8081

spring:
  application:
    name: provider

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/

可通过postman或者VSCode的Thunder Client插件向http://localhost:8081/helloDemo/sayHello.do发起POST请求，如果能获得 Hello world!中文是否正常？ 的响应，说明提供方服务正常运行。如果向http://localhost:9000/PROVIDER/helloDemo/sayHello.do发起POST请求能获得相同的响应，说明Gateway的Eureka默认路由生效了。

5、创建消费方应用

pom.xml

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>clouddemo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <artifactId>invoker</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
    </dependencies>
    <name>invoker</name>
    <description>invoker</description>
</project>

应用主类：

package com.example.invoker;

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

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class InvokerApp {
    public static void main(String[] args) {
        SpringApplication.run(InvokerApp.class, args);
    }
}

调用provider客户端接口

package com.example.invoker.helloinvoker.client;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.PostMapping;

@Component
@FeignClient ("provider")
public interface IHelloProvider {
    @PostMapping("/helloDemo/sayHello.do")
    public String callSayHello();
}

invoker为前端提供服务的controler类

package com.example.invoker.helloinvoker.ctrler;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.example.invoker.helloinvoker.client.IHelloProvider;

@RestController
@RequestMapping("/invokerClient")
public class InvokerClient {

    @Autowired
    private IHelloProvider helloProvider;

    @PostMapping("/callProviderService.do")
    public String callProviderService() {
        return "callProviderService = " + helloProvider.callSayHello();
    }
}

application.yml

server:
  port: 8082

spring:
  application:
    name: invoker

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/

可通过postman或者VSCode的Thunder Client插件向http://localhost:8082/invokerClient/callProviderService.do发起POST请求，如果能获得 callProviderService = Hello world!中文是否正常？ 的响应，说明消费方服务以及调用提供方服务均正常运行。如果向http://localhost:9000/invoker-service/invokerClient/callProviderService.do和http://localhost:9000/INVOKER/invokerClient/callProviderService.do发起POST请求能获得相同的响应，说明Gateway的配置路由和Eureka默认路由均生效了。

6、spring boot应用集成druid和mybatis

pom.xml，重点加入druid和mybatis相关依赖：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.peng</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.2.11</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.29</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

application.yml，重点是配置druid和mybatis的map：

server:
  port: 8081

spring:
  datasource:
    druid:
      url: jdbc:mysql://localhost:3306/testdb?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai&zeroDateTimeBehavior=convertToNull
      #url: jdbc:mysql://localhost:3306/testdb?serverTimezone=Asia/Shanghai
      username: user
      password: userpassword
      driver-class-name: com.mysql.cj.jdbc.Driver

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

sqlmap.xml文件，注意该文件因存放在resources目录下：

<?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.example.demo.hello.dao.IHelloDao">
    <resultMap id="queryMap" type="com.example.demo.hello.vos.FirstTable">
        <id column="id_col" jdbcType="VARCHAR" property="idCol"/>
        <result column="name_col" jdbcType="VARCHAR" property="nameCol"/>
        <result column="age_col" jdbcType="INTEGER" property="ageCol"/>
    </resultMap>
    
    <select id="queryData" resultMap="queryMap">
        SELECT id_col, name_col, age_col
        FROM first_table
    </select>
    <insert id="insertData">
        INSERT INTO first_table (id_col, name_col, age_col)
        VALUES('0000000000000002', '新增数据', 20);
    </insert>
</mapper>

IHelloDao.java，重点是@Mapper注解：

package com.example.demo.hello.dao;

import java.util.List;

import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import com.example.demo.hello.vos.FirstTable;

@Mapper
@Repository
public interface IHelloDao {
    public List<FirstTable> queryData();
    public int insertData();
}

调用dao的ServiceImpl类：

package com.example.demo.hello.service.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.example.demo.hello.dao.IHelloDao;
import com.example.demo.hello.service.IHelloService;
import com.example.demo.hello.vos.FirstTable;

@Service
public class HelloServiceImpl implements IHelloService {

    @Autowired
    private IHelloDao helloDao;

    @Override
    public List<FirstTable> queryData() {
        List<FirstTable> result = helloDao.queryData();
        for (FirstTable firstTable : result) {
            System.out.println(firstTable.getNameCol());
        }
        System.out.println("什么情况啊？");
        return result;
    }

    @Override
    public int insertData() {
        return helloDao.insertData() + helloDao.insertData();
    } 
}
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