Cloud-Eureka服务治理-Ribbon负载均衡

构建Cloud父工程

父工程只做依赖版本管理不引入依赖

pom.xml

 <packaging>pom</packaging><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.3.9.RELEASE</version><relativePath/></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version><spring-cloud.version>Hoxton.SR10</spring-cloud.version><mysql.version>5.1.47</mysql.version><mybatis.version>2.1.1</mybatis.version><junit.version>4.12</junit.version><log4j.version>1.2.17</log4j.version><lombok.version>1.16.18</lombok.version></properties><dependencyManagement><dependencies><!-- springCloud --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${spring-cloud.version}</version><type>pom</type><scope>import</scope></dependency><!-- mysql驱动 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>${mysql.version}</version></dependency><!--mybatis--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>${mybatis.version}</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>${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><dependencies><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency></dependencies>

构建用户模块

CREATE TABLE `tb_user` (
`id` bigint NOT NULL AUTO_INCREMENT,
`username` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL COMMENT '收件人',
`address` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL COMMENT '地址',
PRIMARY KEY (`id`) USING BTREE,
UNIQUE KEY `username` (`username`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=109 DEFAULT CHARSET=utf8mb3 ROW_FORMAT=COMPACT;

INSERT INTO `tb_user`(`id`, `username`, `address`) VALUES (1, '柳岩', '湖南省衡阳市');
INSERT INTO `tb_user`(`id`, `username`, `address`) VALUES (2, '文二狗', '陕西省西安市');
INSERT INTO `tb_user`(`id`, `username`, `address`) VALUES (3, '华沉鱼', '湖北省十堰市');
INSERT INTO `tb_user`(`id`, `username`, `address`) VALUES (4, '张必沉', '天津市');
INSERT INTO `tb_user`(`id`, `username`, `address`) VALUES (5, '郑爽爽', '辽宁省沈阳市大东区');
INSERT INTO `tb_user`(`id`, `username`, `address`) VALUES (6, '范兵兵', '山东省青岛市');

pom.xml

 <dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!--mybatis--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId></dependency></dependencies><build><finalName>app</finalName><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build>

application.yml

server:port: 8081
spring:application:name: user-servicedatasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/cloud-user?useSSL=false&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&serverTimezone=GMT%2B8&useCursorFetch=trueusername: rootpassword: 123456#redis:#port: 6379#database: 0#password: 1111111111111#ssl: false#####################################################redis 集群环境配置#cluster:#  nodes: 127.0.0.1:7001,127.0.0.1:7002,127.0.0.1:7003#  commandTimeout: 5000
mybatis:type-aliases-package: com.example.userservice.pojoconfiguration:map-underscore-to-camel-case: true
logging:level:com.example.userservice.mapper: debug

pojo

@Data
public class User {private Long id;private String username;private String address;
}

mapper

public interface UserMapper {@Select("select * from tb_user where id = #{id}")User findById(@Param("id") Long id);
}

service

public interface UserService {User queryById(Long id);
}

impl

@Service
public class UserServiceImpl implements UserService {@Autowiredprivate UserMapper userMapper;public User queryById(Long id) {return userMapper.findById(id);}
}

controller

@RestController
@RequestMapping("/user")
@Slf4j
public class UserController {@Autowiredprivate UserService userService;@Value("${server.port}")private String serverPort;@GetMapping("/serverport")public String serverport(){return serverPort;}@GetMapping("/{id}")public User queryById(@PathVariable("id") Long id) {return userService.queryById(id);}
}

这样你可以开多个

构建订单模块

CREATE TABLE `tb_order` (
`id` bigint NOT NULL AUTO_INCREMENT COMMENT '订单id',
`user_id` bigint NOT NULL COMMENT '用户id',
`name` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL COMMENT '商品名称',
`price` bigint NOT NULL COMMENT '商品价格',
`num` int DEFAULT '0' COMMENT '商品数量',
PRIMARY KEY (`id`) USING BTREE,
UNIQUE KEY `username` (`name`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=109 DEFAULT CHARSET=utf8mb3 ROW_FORMAT=COMPACT;

INSERT INTO `tb_order` VALUES (101, 1, 'Apple 苹果 iPhone 12 ', 699900, 1);
INSERT INTO `tb_order` VALUES (102, 2, '雅迪 yadea 新国标电动车', 209900, 1);
INSERT INTO `tb_order` VALUES (103, 3, '骆驼（CAMEL）休闲运动鞋女', 43900, 1);
INSERT INTO `tb_order` VALUES (104, 4, '小米10 双模5G 骁龙865', 359900, 1);
INSERT INTO `tb_order` VALUES (105, 5, 'OPPO Reno3 Pro 双模5G 视频双防抖', 299900, 1);
INSERT INTO `tb_order` VALUES (106, 6, '美的（Midea) 新能效冷静星II ', 544900, 1);
INSERT INTO `tb_order` VALUES (107, 2, '西昊/SIHOO 人体工学电脑椅子', 79900, 1);
INSERT INTO `tb_order` VALUES (108, 3, '梵班（FAMDBANN）休闲男鞋', 31900, 1);

pom.xml

 <dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!--mybatis--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency></dependencies><build><finalName>orderserver</finalName><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build>

pojo

@Data
public class Order {private Long id;private Long price;private String name;private Integer num;private Long userId;private User user;
}

@Data
public class User {private Long id;private String username;private String address;
}

mapper

public interface OrderMapper {@Select("select * from tb_order where id = #{id}")Order findById(Long id);
}

service

public interface OrderService {Order queryOrderById(Long orderId);
}

impl

@Service
public class OrderServiceImpl implements OrderService {@Autowiredprivate OrderMapper orderMapper;@Overridepublic Order queryOrderById(Long orderId) {return orderMapper.findById(orderId);}
}

controller

@RestController
@RequestMapping("/order")
public class OrderController {@Autowiredprivate OrderService orderService;@GetMapping("{orderId}")public Order queryOrderByUserId(@PathVariable("orderId") Long orderId) {// 根据id查询订单并返回return orderService.queryOrderById(orderId);}
}

合并公共代码

像pojo可以放在common-api里

构建基础公用模块

使用RestTemplate进行服务间调用

服务调用出现的问题

通过硬编码的方式调用,那么当服务多了又该如何应对

搭建单机Eureka服务

服务既可以是生产者,也可是是消费者也可以同时扮演生产者和消费者两个角色

Eureka分服务端和客户端

我们要注册进去的OrderServer和UserServer都是客户端

所有注册到Eureka的服务每30秒都会给注册中心发送心跳检测,证明我活着

server:port: 7001
spring:application:name: eureka-server
eureka:instance:hostname: eurekaserver  # eureka服务端的实例名称  集群的时候配置client:# 表示不向注册中心注册自己  集群必须为trueregister-with-eureka: true# 表示自己就是注册中心，职责是维护服务实例，并不需要去检索服务  单fetch-registry: trueservice-url:# 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  ${}是上面定义的defaultZone: http://127.0.0.1:${server.port}/eureka/