SpringCloud-負載均衡Robbin
項目結構
父工程(每一個服務都是一個子工程)
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pom.xml
<?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.xiaoge.demo</groupId> <artifactId>cloud-demo</artifactId> <version>1.0-SNAPSHOT</version> <modules> <module>user-service</module> <module>consumer-demo</module> <module>eureka-server</module> </modules> <packaging>pom</packaging> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.4.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </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>Finchley.SR1</spring-cloud.version> <mapper.starter.version>2.0.3</mapper.starter.version> <mysql.version>5.1.32</mysql.version> </properties> <dependencyManagement> <!-- 所有子工程, 必須引下面的依賴纔會有 --> <dependencies> <!-- spring cloud 引用了它, 以後cloud依賴版本就不用寫了 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> <!-- 通用Mapper啓動器 --> <dependency> <groupId>tk.mybatis</groupId> <artifactId>mapper-spring-boot-starter</artifactId> <version>${mapper.starter.version}</version> </dependency> <!-- mysql驅動 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> </dependencies> </dependencyManagement> <dependencies> <!-- 因爲不會再dependencyManagement標籤裏, 所以所有的子工程都可以用 --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
consumer-demo服務
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配置文件
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pom.xml
<?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>cloud-demo</artifactId> <groupId>com.xiaoge.demo</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>consumer-demo</artifactId> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- 引入eureka客戶端依賴 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <!-- 引入負載均衡 ribbon --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-ribbon</artifactId> </dependency> </dependencies> </project>
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application.yml
server: port: 8088 spring: # 在eureka中註冊的服務名稱 application: name: consumer-service # 註冊方 # eureka配置 因爲它要去註冊中心註冊, 所以要配置 eureka: client: service-url: defaultZone: http://127.0.0.1:10086/eureka, http://127.0.0.1:10087/eureka # 配置所有的eureka地址, 防止其中一個eureka掛掉 registry-fetch-interval-seconds: 3 # 設置拉取服務列表的週期 爲3秒 fetch-registry: true # 默認爲true 拉取列表, 改爲false 不拉取 instance: prefer-ip-address: true # 我希望使用ip地址 ip-address: 127.0.0.1 # 設置ip地址 # 對那個服務實現負載均衡 user-service: # 對user-service服務 (服務名稱) ribbon: # 固定寫法 NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule # 使用負載均衡隨機算法, 默認是輪詢
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啓動類
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ConsumerApplication
package com.xiaoge; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; import org.springframework.cloud.client.loadbalancer.LoadBalanced; import org.springframework.context.annotation.Bean; import org.springframework.web.client.RestTemplate; /** * @program: cloud-demo * @description: 服務調用方 * @author: Mr.Xiao * @create: 2020-05-04 16:04 **/ @EnableDiscoveryClient // 它也是客戶端, 它捷能兼容eureka 又能consul、zookeeper等等, 更通用, 更廣泛 @SpringBootApplication public class ConsumerApplication { @Bean @LoadBalanced // 加上ribbon 負載均衡註解 public RestTemplate restTemplate() { return new RestTemplate(); } public static void main(String[] args) { SpringApplication.run(ConsumerApplication.class); } }
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實體類
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User
package com.xiaoge.Consumer.pojo; import lombok.Data; import java.io.Serializable; import java.util.Date; /** * @program: cloud-demo * @description: * @author: Mr.Xiao * @create: 2020-05-04 16:06 **/ @Data public class User implements Serializable { // 主鍵 private Long id; // 用戶名 private String username; // 密碼 private String password; // 姓名 private String name; // 年齡 private Integer age; // 性別,1男性,2女性 private Integer sex; // 出生日期 private Date birthday; // 創建時間 private Date created; // 更新時間 private Date updated; // 備註 private String note; }
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表現層
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ConsumerController
package com.xiaoge.Consumer.controller; import com.xiaoge.Consumer.pojo.User; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.cloud.client.discovery.DiscoveryClient; import org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient; 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 java.util.List; /** * @program: cloud-demo * @description: 動態拉取服務列表 * @author: Mr.Xiao * @create: 2020-05-04 16:08 **/ @RestController @RequestMapping("/consumer") public class ConsumerController { @Autowired private RestTemplate restTemplate; @Autowired private DiscoveryClient discoveryClient; // 專門負責服務發現 //@Autowired //private RibbonLoadBalancerClient client; // 專門負責 負載均衡 獲取服務的 /* @GetMapping("/{id}") public User queryById(@PathVariable("id") Long id){ // 拉取服務 根據服務id獲取實例 List<ServiceInstance> instances = discoveryClient.getInstances("user-service"); // 獲取第一個實例, 從實例當中取出ip和端口 ServiceInstance instance = instances.get(0); // 這個位置正常情況下, 要寫負載均衡算法, 我這裏是隨便取得 // 獲取ip String ip = instance.getHost(); // 獲取端口 int port = instance.getPort(); // 訪問的地址 String url = "http://" + ip + ":" + port; User user = restTemplate.getForObject(url + "/user/" + id, User.class); return user; } */ /* @GetMapping("/{id}") public User queryById(@PathVariable("id") Long id){ // 負載均衡算法: 隨機, 輪詢. hash // 拉取服務 根據服務id獲取實例 ServiceInstance instance = client.choose("user-server"); // 默認使用的輪詢 // 獲取ip String ip = instance.getHost(); // 獲取端口 int port = instance.getPort(); // 訪問的地址 String url = "http://" + ip + ":" + port; User user = restTemplate.getForObject(url + "/user/" + id, User.class); return user; } */ @GetMapping("/{id}") public User queryById(@PathVariable("id") Long id){ // 負載均衡算法: 隨機, 輪詢. hash // 1. 在註冊restTemplate上加註解@LoadBalanced // 2. 直接寫路徑 String url = "http://user-service/user/" + id; User user = restTemplate.getForObject(url, User.class); return user; } }
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eureka-server服務
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配置文件
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pom.xml
<?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>cloud-demo</artifactId> <groupId>com.xiaoge.demo</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>eureka-server</artifactId> <dependencies> <!-- springcloud 註冊中心 eureka --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> </dependencies> </project>
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application.yml
# 這是eureka的默認端口號 server: port: 10086 # 配置eureka服務名稱 spring: application: name: eureka-server # 註冊方 # 告訴eureka要註冊的地址在哪裏 (這樣eureka就不會報一個com.sun.jersey.api.client.ClientHandlerException異常) eureka: client: service-url: defaultZone: http://127.0.0.1:10086/eureka # 配置所有的eureka地址, 防止其中一個eureka掛掉 register-with-eureka: false # 默認爲true 註冊自己, 改爲false 不 註冊自己 instance: prefer-ip-address: true # 我希望使用ip地址 ip-address: 127.0.0.1 # 設置ip地址 server: eviction-interval-timer-in-ms: 60000 # 設置eureka失效剔除時長, 每隔60秒失效剔除一次, 失效剔除掛掉的eureka
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啓動類
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EurekaServer
package com.xiaoge; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; /** * @program: cloud-demo * @description: EurekaServer端 * @author: Mr.Xiao * @create: 2020-05-04 16:34 **/ @EnableEurekaServer // 啓動Eureka服務 @SpringBootApplication public class EurekaServer { public static void main(String[] args) { SpringApplication.run(EurekaServer.class); } }
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user-service服務
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配置文件
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pom.xml
<?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>cloud-demo</artifactId> <groupId>com.xiaoge.demo</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>user-service</artifactId> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>tk.mybatis</groupId> <artifactId>mapper-spring-boot-starter</artifactId> </dependency> <!-- 引入eureka(註冊中心)-客戶端 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> </dependencies> </project>
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application.yml
server: port: 9090 spring: # 在eureka中註冊的服務名稱 application: name: user-service # 數據庫連接信息配置 datasource: url: jdbc:mysql://localhost:3306/yun6 username: root password: root hikari: maximum-pool-size: 20 minimum-idle: 10 # 別名包 mybatis: type-aliases-package: com.xiaoge.user.pojo # 註冊方 # eureka配置 因爲它要去註冊中心註冊, 所以要配置 eureka: client: service-url: defaultZone: http://127.0.0.1:10086/eureka, http://127.0.0.1:10087/eureka # 配置所有的eureka地址, 防止其中一個eureka掛掉 instance: prefer-ip-address: true # 我希望使用ip地址 ip-address: 127.0.0.1 # 設置ip地址 lease-renewal-interval-in-seconds: 30 # 每隔30秒發一次心跳 lease-expiration-duration-in-seconds: 90 # 每隔30秒發一次心跳, 如果隔了90秒都沒發, 那就證明掛了
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啓動類
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UserApplication
package com.xiaoge; 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; import tk.mybatis.spring.annotation.MapperScan; /** * @program: cloud-demo * @description: 服務的提供方 * @author: Mr.Xiao * @create: 2020-05-04 15:43 **/ @EnableDiscoveryClient // 它也是客戶端, 它捷能兼容eureka 又能consul、zookeeper等等, 更通用, 更廣泛 @SpringBootApplication @MapperScan("com.xiaoge.user.mapper") public class UserApplication { public static void main(String[] args) { SpringApplication.run(UserApplication.class); } }
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實體類
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User
package com.xiaoge.user.pojo; import lombok.Data; import tk.mybatis.mapper.annotation.KeySql; import javax.persistence.Id; import javax.persistence.Table; import java.io.Serializable; import java.util.Date; /** * @program: cloud-demo * @description: * @author: Mr.Xiao * @create: 2020-05-04 15:46 **/ @Table(name = "tb_user") @Data public class User implements Serializable { @Id @KeySql(useGeneratedKeys = true) // id自動增長 private Long id; // 用戶名 private String username; // 密碼 private String password; // 姓名 private String name; // 年齡 private Integer age; // 性別,1男性,2女性 private Integer sex; // 出生日期 private Date birthday; // 創建時間 private Date created; // 更新時間 private Date updated; // 備註 private String note; }
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表現層
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UserController
package com.xiaoge.user.controller; import com.xiaoge.user.pojo.User; import com.xiaoge.user.service.UserService; import org.springframework.beans.factory.annotation.Autowired; 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; /** * @program: cloud-demo * @description: * @author: Mr.Xiao * @create: 2020-05-04 15:51 **/ @RestController @RequestMapping("/user") public class UserController { @Autowired private UserService userService; @GetMapping("/{id}") public User queryById(@PathVariable("id") Long id) { User user = userService.queryById(id); return user; } }
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業務層
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UserService接口
package com.xiaoge.user.service; import com.xiaoge.user.pojo.User; /** * @program: cloud-demo * @description: * @author: Mr.Xiao * @create: 2020-05-04 15:50 **/ public interface UserService { public User queryById(Long id); }
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UserServiceImpl實體類
package com.xiaoge.user.service.impl; import com.xiaoge.user.mapper.UserMapper; import com.xiaoge.user.pojo.User; import com.xiaoge.user.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; /** * @program: cloud-demo * @description: * @author: Mr.Xiao * @create: 2020-05-04 15:51 **/ @Service public class UserServiceImpl implements UserService { @Autowired private UserMapper userMapper; @Override public User queryById(Long id) { return userMapper.selectByPrimaryKey(id); } }
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Mapper
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UserMapper
package com.xiaoge.user.mapper; import com.xiaoge.user.pojo.User; import tk.mybatis.mapper.common.Mapper; /** * @program: cloud-demo * @description: * @author: Mr.Xiao * @create: 2020-05-04 15:49 **/ public interface UserMapper extends Mapper<User> { }
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