摘要：第篇簡單用戶微服務一大致介紹通過接口來簡單獲取數據庫中的用戶信息，并且數據庫中的字段與實體類的字段相互映射。添加簡單用戶微服務啟動類簡單用戶微服務類。
SpringCloud（第 001 篇）簡單用戶微服務
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一、大致介紹
通過 RestAPI 接口 /simple/{id} 來簡單獲取 H2 數據庫中的用戶信息，并且數據庫中的字段與實體 User 類的字段相互映射 。
二、實現步驟
2.1 添加 maven 引用包
4.0.0
springms-simple-provider-user
1.0-SNAPSHOT
jar
com.springms.cloud
springms-spring-cloud
1.0-SNAPSHOT
org.springframework.boot
spring-boot-starter-data-jpa
org.springframework.boot
spring-boot-starter-web
com.h2database
h2
runtime
org.springframework.boot
spring-boot-starter-data-solr
2.2 添加應用配置文件（springms-simple-provider-usersrcmainresourcesapplication.yml）
server:
port: 8000
spring:
application:
name: springms-simple-provider-user #全部小寫
jpa:
generate-ddl: false
show-sql: true
hibernate:
ddl-auto: none
datasource:
platform: h2
schema: classpath:schema.sql
data: classpath:data.sql
logging:
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 數據庫腳本（springms-simple-provider-usersrcmainresourcesschema.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 數據庫一些初始化數據（springms-simple-provider-usersrcmainresourcesdata.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", 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", "趙六", 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", "張遠", 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", "關羽", 30, 100.00);
2.5 添加訪問底層數據模型的DAO接口（springms-simple-provider-usersrcmainjavacomspringmscloudrepositoryUserRepository.java）
package com.springms.cloud.repository;
import com.springms.cloud.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
@Repository
public interface UserRepository extends JpaRepository {
}
2.6 添加實體用戶類User（springms-simple-provider-usersrcmainjavacomspringmscloudentityUser.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;
@Entity
public 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 添加用戶Web訪問層Controller（springms-simple-provider-usersrcmainjavacomspringmscloudcontrollerMsSimpleProviderUserController.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;
/**
* 用戶微服務Controller。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017/9/17
*
*/
@RestController
public class MsSimpleProviderUserController {
@Autowired
private UserRepository userRepository;
@GetMapping("/simple/{id}")
public User findById(@PathVariable Long id) {
return this.userRepository.findOne(id);
}
}
2.8 添加簡單用戶微服務啟動類（springms-simple-provider-usersrcmainjavacomspringmscloudMsSimpleProviderUserApplication.java）
package com.springms.cloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* 簡單用戶微服務類。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017/9/17
*
*/
@SpringBootApplication
public class MsSimpleProviderUserApplication {
public static void main(String[] args) {
SpringApplication.run(MsSimpleProviderUserApplication.class, args);
System.out.println("【【【【【【 簡單用戶微服務 】】】】】】已啟動.");
}
}
三、測試
/****************************************************************************************
一、簡單用戶微服務接口測試：
1、啟動 springms-simple-provider-user 模塊服務，啟動1個端口；
2、在瀏覽器輸入地址 http://localhost:8000/simple/1 可以看到信息成功的被打印出來。；
****************************************************************************************/
四、下載地址
https://gitee.com/ylimhhmily/SpringCloudTutorial.git
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