spring cloud微服務架構 服務提供者和服務消費者
阿新 • • 發佈:2017-09-27
服務 lee 名詞 mave into gin tag bigint snap 服務提供者和服務消費者
下面這張表格,簡單描述了服務提供者/消費者是什麽: | 名詞 | 概念 | | ----- | ----------------------- | | 服務提供者 | 服務的被調用方(即:為其他服務提供服務的服務) | | 服務消費者 | 服務的調用方(即:依賴其他服務的服務) | 服務提供者代碼示例 這是一個稍微有點復雜的程序。我們使用spring-data-jpa操作h2數據庫,同時將該服務註冊到註冊中心Eureka中。 1、創建一個Maven工程,並在pom.xml中添加如下內容:
<?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> <artifactId>microservice-provider-user</artifactId> <packaging>jar</packaging> <name>microservice-provider-user</name> <description>Demo project for Spring Boot</description> <parent> <groupId>com.xujin.study</groupId> <artifactId>microservice-spring-cloud</artifactId> <version>0.0.1-SNAPSHOT</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> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka</artifactId> </dependency> </dependencies> </project>
2、編寫建表語句init.sql
drop table user if exists; create table user ( id bigint generated by default as identity, username varchar(40), name varchar(20), age int(3), balance decimal(10,2), primary key (id) );
3、編寫插入語句 insert.sql
insert into user (id, username, name, age, balance) values (1, ‘user1‘, ‘張三‘, 20, 100.00); insert into user (id, username, name, age, balance) values (2, ‘user2‘, ‘李四‘, 20, 100.00); insert into user (id, username, name, age, balance) values (3, ‘user3‘, ‘王五‘, 20, 100.00); insert into user (id, username, name, age, balance) values (4, ‘user4‘, ‘馬六‘, 20, 100.00);
4、編寫啟動類MicroserviceSimpleProviderUserApplication
package com.xujin.study; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; @SpringBootApplication @EnableEurekaClient public class MicroserviceSimpleProviderUserApplication { public static void main(String[] args) { SpringApplication.run(MicroserviceSimpleProviderUserApplication.class, args); } }
5、編寫實體類User
package com.xujin.study.entity; import java.io.Serializable; import java.math.BigDecimal; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; @Entity public class User implements Serializable{ private static final long serialVersionUID = 1L; @Id @GeneratedValue(strategy = GenerationType.AUTO ) private Long id; @Column private String username; @Column private String name; @Column private Short age; @Column private BigDecimal balance; public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Short getAge() { return age; } public void setAge(Short age) { this.age = age; } public BigDecimal getBalance() { return balance; } public void setBalance(BigDecimal balance) { this.balance = balance; } }
6、編寫Repository接口UserRepository
package com.xujin.study.repository; import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.stereotype.Repository; import com.xujin.study.entity.User; @Repository public interface UserRepository extends JpaRepository<User, Long>{ }
7、編寫service業務類UserService
package com.xujin.study.service; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.xujin.study.entity.User; import com.xujin.study.repository.UserRepository; @Service public class UserService { @Autowired private UserRepository userRepository; public User findOne(Long id){ return userRepository.findOne(id); } }
8、編寫控制器UserController
package com.xujin.study.controller; 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.RestController; import com.xujin.study.entity.User; import com.xujin.study.service.UserService; @RestController public class UserController { @Autowired private UserService userService; @GetMapping("/simple/{id}") public User findById(@PathVariable Long id){ return this.userService.findOne(id); } }
9、配置文件application.yml
server: port: 7901 # contextPath: /microservice-simple-provider-user 指定項目部署使用項目名 spring: application: name: microservice-provider-user # 項目名稱盡量用小寫(註冊到eureka的名字) jpa: generate-ddl: false show-sql: true hibernate: ddl-auto: none datasource: # 指定數據源 platform: h2 # 指定數據源類型 schema: classpath:init.sql # 指定h2數據庫的建表腳本 data: classpath:insert.sql # 指定h2數據庫的insert腳本 logging: level: root: INFO org.hibernate: INFO org.hibernate.type.descriptor.sql.BasicBinder: TRACE org.hibernate.type.descriptor.sql.BasicExtractor: TRACE com.itmuch.youran.persistence: ERROR eureka: client: serviceUrl: defaultZone: http://root:[email protected]:8761/eureka/ instance: prefer-ip-address: true #指定應用微服務在eureka上面的鏈接為IP地址 instance-id: ${spring.application.name}:${server.port}
10、訪問 http://localhost:7901/simple/1
{"id":1,"username":"user1","name":"張三","age":20,"balance":100.00}
spring cloud微服務架構 服務提供者和服務消費者