SpringCloud（第 001 篇）簡單用戶微服務

時間 2019-11-09

標籤 springcloud 簡單用戶微服简体版

原文原文鏈接

SpringCloud（第 001 篇）簡單用戶微服務

-java

1、大體介紹

經過 RestAPI 接口 /simple/{id} 來簡單獲取 H2 數據庫中的用戶信息，而且數據庫中的字段與實體 User 類的字段相互映射 。

2、實現步驟

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>
        <!-- 訪問數據庫模塊 -->
        <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數據庫模塊 -->
        <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 添加應用配置文件（springms-simple-provider-usersrcmainresourcesapplication.yml）

server:
  port: 8000
spring:
  application:
    name: springms-simple-provider-user  #所有小寫
  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<User, Long> {

}

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啓動類（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 】】】】】】已啓動.");
    }
}

3、測試

/****************************************************************************************
 1、簡單用戶微服務接口測試：

 一、啓動 springms-simple-provider-user 模塊服務，啓動1個端口；
 二、在瀏覽器輸入地址 http://localhost:8000/simple/1 能夠看到信息成功的被打印出來。；
 ****************************************************************************************/