SpringCloud（第001篇）簡單用戶微服務(wù)

一、大致介紹

通過 RestAPI 接口 /simple/{id} 來簡單獲取 H2 數(shù)據(jù)庫中的用戶信息，并且數(shù)據(jù)庫中的字段與實體 User 類的字段相互映射 。

二、實現(xiàn)步驟

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>        <!-- 訪問數(shù)據(jù)庫模塊 -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-data-jpa</artifactId>        </dependency>        <!-- web模塊 -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <!-- h2數(shù)據(jù)庫模塊 -->        <dependency>            <groupId>com.h2database</groupId>            <artifactId>h2</artifactId>            <scope>runtime</scope>        </dependency>        <!-- 支持Apache Solr搜索平臺，包括spring-data-solr -->		<dependency>			<groupId>org.springframework.boot</groupId>			<artifactId>spring-boot-starter-data-solr</artifactId>		</dependency>    </dependencies></project>

2.2 添加應(yīng)用配置文件（springms-simple-provider-user\src\main\resources\application.yml）

server:  port: 8000spring:  application:    name: springms-simple-provider-user  #全部小寫  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 數(shù)據(jù)庫腳本（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 數(shù)據(jù)庫一些初始化數(shù)據(jù)（springms-simple-provider-user\src\main\resources\data.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(yuǎn)', 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(guān)羽', 30, 100.00);

2.5 添加訪問底層數(shù)據(jù)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 添加實體用戶類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 添加用戶Web訪問層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;/** * 用戶微服務(wù)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 添加簡單用戶微服務(wù)啟動類（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;/** * 簡單用戶微服務(wù)類。 * * @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("【【【【【【 簡單用戶微服務(wù) 】】】】】】已啟動.");	}}

三、測試

/**************************************************************************************** 一、簡單用戶微服務(wù)接口測試： 1、啟動 springms-simple-provider-user 模塊服務(wù)，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。； ****************************************************************************************/