SpringCloud（第001篇）简单用户微服务
一、大致介绍
通过 RestAPI 接口 /simple/{id} 来简单获取 H2 数据库中的用户信息，并且数据库中的字段与实体 User 类的字段相互映射 。
二、实现步骤
2.1 添加 maven 引用包
<?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>springms-simple-provider-user</artifactId> <version>1.0-SNAPSHOT</version> <packaging>jar</packaging> <parent> <groupId>com.springms.cloud</groupId> <artifactId>springms-spring-cloud</artifactId> <version>1.0-SNAPSHOT</version> </parent> <dependencies> <!-- 访问数据库模块 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <!-- web模块 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- h2数据库模块 --> <dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> <scope>runtime</scope> </dependency> <!-- 支持Apache Solr搜索平台，包括spring-data-solr --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-solr</artifactId> </dependency> </dependencies></project>
2.2 添加应用配置文件（springms-simple-provider-user\src\main\resources\application.yml）
server: port: 8000spring: application: name: springms-simple-provider-user #全部小写 jpa: generate-ddl: false show-sql: true hibernate: ddl-auto: none datasource: platform: h2 schema: classpath:schema.sql data: classpath:data.sqllogging: level: root: INFO org.hibernate: INFO org.hibernate.type.descriptor.sql.BasicBinder: TRACE org.hibernate.type.descriptor.sql.BasicExtractor: TRACE com.springms: DEBUG
2.3 添加 H2 数据库脚本（springms-simple-provider-user\src\main\resources\schema.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));
2.4 插入 H2 数据库一些初始化数据（springms-simple-provider-user\src\main\resources\data.sql）
INSERT into user (id, username, name, age, balance) values (1, 'user1', '张三', 20, 100.00);INSERT into user (id, username, name, age, balance) values (2, 'user2', '李四', 22, 100.00);INSERT into user (id, username, name, age, balance) values (3, 'user3', '王五', 24, 100.00);INSERT into user (id, username, name, age, balance) values (4, 'user4', '赵六', 26, 100.00);INSERT into user (id, username, name, age, balance) values (5, 'user5', '李逵', 27, 100.00);INSERT into user (id, username, name, age, balance) values (6, 'user6', '张远', 10, 100.00);INSERT into user (id, username, name, age, balance) values (7, 'user7', '迪拜', 60, 100.00);INSERT into user (id, username, name, age, balance) values (8, 'user8', '哈士奇', 40, 100.00);INSERT into user (id, username, name, age, balance) values (9, 'user9', '关羽', 30, 100.00);
2.5 添加访问底层数据模型的DAO接口（springms-simple-provider-user\src\main\java\com\springms\cloud\repository\UserRepository.java）
package com.springms.cloud.repository;import com.springms.cloud.entity.User;import org.springframework.data.jpa.repository.JpaRepository;import org.springframework.stereotype.Repository;@Repositorypublic interface UserRepository extends JpaRepository<User, Long> {}
2.6 添加实体用户类User（springms-simple-provider-user\src\main\java\com\springms\cloud\entity\User.java）
package com.springms.cloud.entity;import java.math.BigDecimal;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;@Entitypublic class User { @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 this.id; } public void setId(Long id) { this.id = id; } public String getUsername() { return this.username; } public void setUsername(String username) { this.username = username; } public String getName() { return this.name; } public void setName(String name) { this.name = name; } public Short getAge() { return this.age; } public void setAge(Short age) { this.age = age; } public BigDecimal getBalance() { return this.balance; } public void setBalance(BigDecimal balance) { this.balance = balance; }}
2.7 添加用户Web访问层Controller（springms-simple-provider-user\src\main\java\com\springms\cloud\controller\MsSimpleProviderUserController.java）
package com.springms.cloud.controller;import com.springms.cloud.entity.User;import com.springms.cloud.repository.UserRepository;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;/** * 用户微服务Controller。 * * @author hmilyylimh * * @version 0.0.1 * * @date 2017/9/17 * */@RestControllerpublic class MsSimpleProviderUserController { @Autowired private UserRepository userRepository; @GetMapping("/simple/{id}") public User findById(@PathVariable Long id) { return this.userRepository.findOne(id); }}
2.8 添加简单用户微服务启动类（springms-simple-provider-user\src\main\java\com\springms\cloud\MsSimpleProviderUserApplication.java）
package com.springms.cloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;/** * 简单用户微服务类。 * * @author hmilyylimh * * @version 0.0.1 * * @date 2017/9/17 * */@SpringBootApplicationpublic class MsSimpleProviderUserApplication { public static void main(String[] args) { SpringApplication.run(MsSimpleProviderUserApplication.class, args); System.out.println("【【【【【【 简单用户微服务 】】】】】】已启动."); }}
三、测试
/**************************************************************************************** 一、简单用户微服务接口测试： 1、启动 springms-simple-provider-user 模块服务，启动1个端口； 2、在浏览器输入地址 http://localhost:8000/simple/1 可以看到信息成功的被打印出来。； ****************************************************************************************/
