Spring Cloud實戰02--SpringCloud實戰（1）微服務場景模擬，服務提供者，服務調用者創建

源碼地址：https://github.com/bubbletg/PracticeAll/tree/master/micro-service-cloud

微服務場景模擬

首先，我們需要模擬一個服務調用的場景，搭建兩個工程：bubbletg-service-provider（服務提供方）和bubbletg-service-consumer（服務調用方）。方便後面學習微服務架構

服務提供方：使用mybatis操作數據庫，實現對數據的增刪改查；並對外提供rest接口服務。

服務消費方：使用restTemplate遠程調用服務提供方的rest接口服務，獲取數據。

創建一個空項目

創建服務提供者

Spring腳手架創建工程

下一步，然後完成。
最後生成：
表示成功了。

全部依賴：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>cn.bubbletg.service</groupId>
    <artifactId>service-provider</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>service-provider</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.0</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

當然，因爲要使用通用mapper，所以我們需要手動加一條依賴：

<dependency>
    <groupId>tk.mybatis</groupId>
    <artifactId>mapper-spring-boot-starter</artifactId>
    <version>2.0.4</version>
</dependency>

非常快捷啊！

編寫代碼

配置

屬性文件,這裏我們採用了yaml語法，而不是properties：

server:
  port: 8081
spring:
  datasource:
    url: jdbc:mysql:///springcloud?serverTimezone=UTC
    username: root
    password: 363491343
mybatis:
  type-aliases-package: cn.bubbletg.service.pojo

實體類

package cn.bubbletg.service.pojo;

import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import java.io.Serializable;
import java.util.Date;

/**
 * @author www.bubbletg.cn * BubbleTg
 * @version 1.0
 * @date 2019/8/23 17:36
 */
@Table(name = "tb_user")
public class User implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    // 用戶名
    private String username;

    // 密碼
    private String password;

    // 姓名
    private String name;

    // 年齡
    private Integer age;

    // 性別，1男性，2女性
    private Integer sex;

    // 出生日期
    private Date birthday;

    // 創建時間
    private Date created;

    // 更新時間
    private Date updated;

    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 getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Integer getSex() {
        return sex;
    }

    public void setSex(Integer sex) {
        this.sex = sex;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public Date getCreated() {
        return created;
    }

    public void setCreated(Date created) {
        this.created = created;
    }

    public Date getUpdated() {
        return updated;
    }

    public void setUpdated(Date updated) {
        this.updated = updated;
    }
}

UserMapper

import tk.mybatis.mapper.common.Mapper;


/**
 * @author www.bubbletg.cn * BubbleTg
 * @version 1.0
 * @date 2019/8/23 17:37
 */
@org.apache.ibatis.annotations.Mapper
public interface UserMapper extends Mapper<User> {

}

UserService

@Service
public class UserService {

    @Autowired
    private UserMapper userMapper;

    public User queryById(Long id) {
        return this.userMapper.selectByPrimaryKey(id);
    }
}

UserController

添加一個對外查詢的接口：

@RestController
@RequestMapping("user")
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping("{id}")
    public User queryById(@PathVariable("id") Long id) {
        return this.userService.queryById(id);
    }
}

運行測試

服務調用者

創建工程

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>cn.bubbletg.service</groupId>
    <artifactId>service-consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>service-consumer</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

編寫測試代碼

首先在引導類中註冊RestTemplate：

@SpringBootApplication
public class ServiceConsumerApplication {

    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
    public static void main(String[] args) {
        SpringApplication.run(ServiceConsumerApplication.class, args);
    }

}

編寫配置（application.yml）：

server:
  port: 80

編寫UserController：

@Controller
@RequestMapping("consumer/user")
public class UserController {

    @Autowired
    private RestTemplate restTemplate;

    @GetMapping
    @ResponseBody
    public User queryUserById(@RequestParam("id") Long id){
        User user = this.restTemplate.getForObject("http://localhost:8081/user/" + id, User.class);
        return user;
    }

}

pojo對象（User）：

package cn.bubbletg.service.pojo;

import java.io.Serializable;
import java.util.Date;

/**
 * @author www.bubbletg.cn * BubbleTg
 * @version 1.0
 * @date 2019/8/23 18:07
 */
public class User implements Serializable {

    private static final long serialVersionUID = 1L;

    private Long id;

    // 用戶名
    private String username;

    // 密碼
    private String password;

    // 姓名
    private String name;

    // 年齡
    private Integer age;

    // 性別，1男性，2女性
    private Integer sex;

    // 出生日期
    private Date birthday;

    // 創建時間
    private Date created;

    // 更新時間
    private Date updated;

    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 getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Integer getSex() {
        return sex;
    }

    public void setSex(Integer sex) {
        this.sex = sex;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public Date getCreated() {
        return created;
    }

    public void setCreated(Date created) {
        this.created = created;
    }

    public Date getUpdated() {
        return updated;
    }

    public void setUpdated(Date updated) {
        this.updated = updated;
    }
}

啓動測試