SpringCloud03---Rest学习环境搭建

1. 概览

我们会使用一个Dept部门模块做一个微服务通用案例Consumer消费者(Client)通过REST调用Provider提供者(Server)提供的服务

新建Maven项目，作为父项目，建立3个子项目

• springcloud-api 【封装的整体entity/接口/公共配置等】

• springcloud-provider-dept-8001 【服务提供者】

• springcloud-consumer-dept-80 【服务消费者】

2. 创建父工程,导入依赖

注意

1. 打包方式 Packageing是pom模式

2. SpringBoot和SpringCloud版本对应 ( 我的：【spring-boot：2.3.7.RELEASE + spring-cloud：Hoxton.SR12】)

<?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>

    <groupId>com.qi</groupId>
    <artifactId>SpringCloud</artifactId>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>springcloud-api</module>
        <module>springcloud-provider-dept-8001</module>
        <module>springcloud-consumer-dept-80</module>
    </modules>

    <!--打包方式  pom-->
    <packaging>pom</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>15</maven.compiler.source>
        <maven.compiler.target>15</maven.compiler.target>
        <junit.version>4.12</junit.version>
        <log4j.version>1.2.17</log4j.version>
        <lombok.version>1.18.20</lombok.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <!--SpringCloud依赖-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Hoxton.SR12</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--SpringBoot依赖-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.3.7.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--数据库依赖-->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.47</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.1.21</version>
            </dependency>
            <!--SpringBoot 启动器-->
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>2.1.2</version>
            </dependency>
            <!--日志测试~-->
            <dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-core</artifactId>
                <version>1.2.3</version>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>${junit.version}</version>
            </dependency>
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>${log4j.version}</version>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

3. springcloud-api

3.1 新建数据库dept

3.2 pojo

@Data
@NoArgsConstructor
@Accessors(chain = true)// 链式写法
public class Dept implements Serializable {  //序列化

    private Long deptno;   //主键
    private String dname;

    //微服务，一个服务对应一个数据库，同一个信息可能存在于不同数据库
    private String db_source;

    public Dept(String dname) {
        this.dname = dname;
    }
}

4. springcloud-provider-dept-8001

4.1 配置文件

pom.xml

<dependencies>
    <!--我们需要拿到实体类-->
    <dependency>
        <groupId>com.qi</groupId>
        <artifactId>springcloud-api</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
    <!--test-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-core</artifactId>
    </dependency>
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-test</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jetty</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
    </dependency>
</dependencies>

application.yaml

server:
  port: 8001
mybatis:
  type-aliases-package: com.qi.springcloud.pojo
  config-location: classpath:mybatis/mybatis-config.xml
  mapper-locations: classpath:mybatis/mapper/*.xml

spring:
  application:
    name: springcloud-provider-dept
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/db01?useUnicode=true&characterEncoding=utf-8
    username: root
    password: 123456

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <!--开启二级缓存-->
        <setting name="cacheEnabled" value="true"/>
    </settings>
</configuration>

4.2 mapper

DeptMapper

@Mapper
@Repository
public interface DeptMapper {

    public boolean addDept(Dept dept);

    public Dept queryById(Long id);

    public List<Dept> queryAll();
}

DeptMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.qi.springcloud.mapper.DeptMapper">

    <insert id="addDept" parameterType="Dept">
        insert into dept (dname,db_source)
        values (#{dname},DATABASE())
    </insert>

    <select id="queryById" resultType="Dept" parameterType="Long">
        select * from dept where deptno = #{deptno};
    </select>

    <select id="queryAll" resultType="Dept">
        select * from dept ;
    </select>

</mapper>

4.3 service

DeptService

public interface DeptService {
    public boolean addDept(Dept dept);

    public Dept queryById(Long id);

    public List<Dept> queryAll();
}

DeptServiceImpl

@Service
public class DeptServiceImpl implements DeptService{

    @Autowired
    private DeptMapper deptMapper;

    @Override
    public boolean addDept(Dept dept) {
        return deptMapper.addDept(dept);
    }

    @Override
    public Dept queryById(Long id) {
        return deptMapper.queryById(id);
    }

    @Override
    public List<Dept> queryAll() {
        return deptMapper.queryAll();
    }
}

4.4 controller

//提供Restful服务
@RestController
public class DeptController {

    @Autowired
    private DeptService deptService;

    @PostMapping("/dept/add")
    public boolean addDept(Dept dept){
        return deptService.addDept(dept);
    }

    @GetMapping("/dept/get/{id}")
    public Dept get(@PathVariable("id") Long id){
        return deptService.queryById(id);
    }

    @GetMapping("/dept/list")
    public List<Dept> queryAll(){
        return deptService.queryAll();
    }
}

5. springcloud-consumer-dept-80

5.1 配置文件

pom.xml

<!--实体类+web-->
<dependencies>
    <dependency>
        <groupId>com.qi</groupId>
        <artifactId>springcloud-api</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
</dependencies>

application.yaml

server:
  port: 80

5.2 ConfigBean

@Configuration
public class ConfigBean {

    @Bean
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }
}

5.3 DeptConsumerController

@RestController
public class DeptConsumerController {

    /**
     * 理解：消费者，不应该有service层~
     * RestTemplate .... 供我们直接调用就可以了！ 注册到Spring中
     * (地址：url, 实体：Map ,Class<T> responseType)
     * <p>
     * 提供多种便捷访问远程http服务的方法，简单的Restful服务模板~
     */

    @Autowired
    private RestTemplate restTemplate;

    //服务提供方地址前缀
    private static final String REST_URL_PREFIX = "http://localhost:8001";

    @RequestMapping("/consumer/dept/add")
    public boolean add(Dept dept) {
        // postForObject(服务提供方地址(接口),参数实体,返回类型.class)
        return restTemplate.postForObject(REST_URL_PREFIX + "/dept/add", dept, Boolean.class);
    }

    @RequestMapping("/consumer/dept/get/{id}")
    public Dept get(@PathVariable("id") Long id) {
        // getForObject(服务提供方地址(接口),返回类型.class)
        return restTemplate.getForObject(REST_URL_PREFIX + "/dept/get/" + id, Dept.class);
    }

    @RequestMapping("/consumer/dept/list")
    public List<Dept> list() {
        return restTemplate.getForObject(REST_URL_PREFIX + "/dept/list", List.class);
    }
}

6. 测试

1. 首先启动springcloud-provider-dept-8001项目，测试http://localhost:8001/dept/list

2. 启动springcloud-consumer-dept-80项目，访问http://localhost/consumer/dept/list,成功访问

3. springcloud-consumer-dept-80访问springcloud-provider-dept-8001下的controller使用REST方式，基本Rest环境搭建成功

SpringCloud03---Rest学习环境搭建

原文：https://www.cnblogs.com/qi-chao/p/15115878.html