1.项目介绍

最近入项目之前要求熟悉一下SpringCloud Nacos微服务基于Feign接口调用并整合Swagger2进行接口文档展示给前端,所以自己按照要求来编写并整合了一套基于SpringCloudAlibaba NacosFeignMyBatisSwagger2的简单微服务抽奖系统,并结合数据库数据进行数据返回。

框架提供了基础的微服务注册与发现,接口Swagger访问、MyBatis注解实现接口Dao层数据访问,可用于快速搭建一个微服务CRUD基础框架。

抽奖接口主要包含:添加商品接口(包含商品名称和中奖率);抽奖接口,对添加的商品进行抽奖返回中奖商品的功能

1.1.项目框架搭建

①项目主要结构说明:

  • common-api模块:用于存放公共的pojo类、接口返回值枚举类、公共的抽奖函数
  • consumer-product7800模块:服务消费方
  • provider-product6700模块:服务提供方

【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP

②pom.xml依赖说明:

父工程主要pom依赖包

其中主要的pom依赖有

spring-cloud-alibaba-dependencies
mybatis-spring-boot-starter
lombok
springfox-swagger2
swagger-bootstrap-ui
【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP
    <!--统一管理jar包版本-->
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <junit.version>4.12</junit.version>
        <springboot.test.version>2.5.0</springboot.test.version>
        <log4j.version>1.2.17</log4j.version>
        <lombok.version>1.16.18</lombok.version>
        <mysql.version>6.0.6</mysql.version>
        <druid.version>1.1.16</druid.version>
        <mybatis.spring.boot.version>2.1.4</mybatis.spring.boot.version>
        <springboot.starter.web>2.4.3</springboot.starter.web>
    </properties>

    <!--子模块继承之后,提供作用:锁定版本+子module不用写groupId和version-->
    <dependencyManagement>
    <dependencies>
        <!--spring boot 2.2.2-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-dependencies</artifactId>
            <version>2.2.2.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        <!--springcloud Hoxton.SR1-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Hoxton.SR1</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        <!--springcloud alibaba 2.1.0.RELEASE-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-dependencies</artifactId>
            <version>2.1.0.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        <!--mysql数据库连接驱动包-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
        <!--web依赖包-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>${springboot.starter.web}</version>
        </dependency>
        <!--alibaba druid数据库-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>${druid.version}</version>
        </dependency>
        <!--mybatis orm框架-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>${mybatis.spring.boot.version}</version>
        </dependency>
        <!--lombok插件引入-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok.version}</version>
        </dependency>
        <!--热启动部署-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <version>2.1.10.RELEASE</version>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <!--测试依赖包引入-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>${springboot.test.version}</version>
            <scope>test</scope>
        </dependency>
        <!--log4j日志包-->
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <!--swagger2依赖-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.7.0</version>
        </dependency>
        <!--swagger第三方ui依赖-->
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>swagger-bootstrap-ui</artifactId>
            <version>1.9.6</version>
        </dependency>
    </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <!--排除lombok jar在打包编译期间-->
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
            <!--引入mybatis逆向工程插件-->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.5</version>
                <configuration>
                    <configurationFile>${basedir}/src/main/resources/mybatis-generator/generatorConfig.xml
                    </configurationFile>
                    <overwrite>true</overwrite>
                    <verbose>true</verbose>
                </configuration>
            </plugin>
        </plugins>
    </build>
View Code

springcloudnacos-provider-product6700

【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP
 <dependencies>
        <!--SpringCloud alibaba nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--SpringBoot整合Web组件-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--服务注册与发现-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!--日常通用jar包配置-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!--api jar包引入-->
        <dependency>
            <groupId>com.fengye</groupId>
            <artifactId>springcloudnacos-common-api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <!--集合判空工具类-->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-collections4</artifactId>
            <version>4.3</version>
        </dependency>
        <!--引入Swagger2组件-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>
        <!--mysql连接驱动包-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <!--引入ui包-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.7.0</version>
        </dependency>
        <!--swagger第三方ui依赖-->
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>swagger-bootstrap-ui</artifactId>
            <version>1.9.6</version>
        </dependency>
    </dependencies>
View Code

springcloudnacos-consumer-product7800

【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP
 <dependencies>
        <!--springcloud openfeign-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <!--sentinel熔断限流-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>
        <!--SpringCloud alibaba nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--引入自定义的api通用包-->
        <dependency>
            <groupId>com.fengye</groupId>
            <artifactId>springcloudnacos-common-api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <!--SpringBoot整合Web组件-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--日常通用jar包配置-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--引入Swagger2组件-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>
        <!--引入ui包-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.7.0</version>
        </dependency>
        <!--swagger第三方ui依赖-->
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>swagger-bootstrap-ui</artifactId>
            <version>1.9.6</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-collections4</artifactId>
            <version>4.3</version>
        </dependency>
    </dependencies>
View Code

③application.yml配置

重点主要是在服务生产方provider-product6700进行数据库连接、mybatis框架、nacos服务注册相关的配置,具体如下:

server:
  port: 6700

spring:
  application:
    name: nacos-product-provider-6700
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
  #数据库连接池配置
  datasource:
    username: root
    password: admin
    #假如时区报错,增加时区配置serverTimezone=UTC
    url: jdbc:mysql://localhost:3306/nacosproduct?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver

#整合mybatis配置
mybatis:
  #config-location: classpath:mybatis/mybatis-config.xml  使用了configuration注解则无需再指定mybatis-config.xml文件
  mapper-locations: classpath:mybatis/mapper/*.xml
  configuration:   #指定mybatis全局配置文件中的相关配置项
    map-underscore-to-camel-case: true
  type-aliases-package: com.fengye.springcloud.entities

#消费者将要去访问的微服务名称
server-url:
  nacos-user-service: http://nacos-product-provider

1.2.项目分包结构说明

以一个服务提供方6700来说,就是简单地controller、mapper、service/impl,mapper层使用xml与注解结合的方式都可以。这里不再多说。

【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP

 而在服务消费方7800来说,主要分为Feign接口调用与Swagger2Config配置类:

【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP

2.Swagger2/Feign接口/抽奖接口说明

2.1.Swagger2配置类

①这里主要的就是在项目中会引入Swagger2的依赖包,以及基于国人UI风格的jar包。

  <!--引入Swagger2组件-->
  <dependency>
          <groupId>io.springfox</groupId>
          <artifactId>springfox-swagger2</artifactId>
          <version>2.9.2</version>
  </dependency>
  <!--swagger第三方ui依赖-->
  <dependency>
      <groupId>com.github.xiaoymin</groupId>
      <artifactId>swagger-bootstrap-ui</artifactId>
      <version>1.9.6</version>
  </dependency>

②编写Swagger2Config配置类:

//将此类交给Spring管理,表示一个配置类
@Configuration
//开启Swagger2
@EnableSwagger2
public class Swagger2Config {
    /**
     * 创建API应用
     * apiInfo() 增加API相关信息
     * 通过select()函数返回一个ApiSelectorBuilder实例,用来控制哪些接口暴露给Swagger来展现,
     * 本例采用指定扫描的包路径来定义指定要建立API的目录
     *
     * @return 返回Swagger的Docket配置Bean实例
     */
    @Bean
    public Docket createRestApi(Environment environment) {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .enable(true)  //enable是否启动swagger,如果为False,则swagger不能在浏览器中访问
                .select()
                //指定API对象扫描哪个包下面的controller
                //参数any():扫描全部; none():都不扫描
                //withClassAnnotation:扫描类上的注解,参数是一个注解的反射对象
                //withMethodAnnotation:扫描方法上的注解
                .apis(RequestHandlerSelectors.basePackage("com.fengye.springcloud"))
                //过滤什么路径
                .paths(PathSelectors.any())
                .build();
    }

    /**
     * 创建该API的基本信息(这些基本信息会展现在文档页面中)
     * 访问地址:http://项目实际地址/swagger-ui.html
     * @return  返回API基本信息
     */
    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                //Swagger2展示界面的标题(重要)
                .title("抽奖接口API文档")
                //描述信息(主要)
                .description("抽奖接口API文档")
                .version("1.0")
                //.termsOfServiceUrl("https://swagger.io/docs")
                //.license("Apache 2.0")
                //.licenseUrl("http://www.apache.org/licenses/LICENSE-2.0")
                //作者信息
                .contact(new Contact("fengye", "https://www.cnblogs.com/yif0118/",
                        "[email protected]"))
                .build();
    }
}

启动整体的项目之后,访问:http://localhost:7800/doc.html,即可看到具体的UI风格的API文档界面:

【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP

2.2.Feign接口请求

Feign的接口请求调用方式主要是基于服务提供方的Controller接口,并在服务消费方编写一个基于Controller接口一样的Service接口层,根据服务名及对应一致的方法名进行调用

springcloudnacos-provider-product6700

服务提供方Controller接口:

【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP
@RestController
@Slf4j
public class ProductController {
    @Autowired
    private ProductService productService;

    /**
     * 测试Nacos数据接口
     *
     * @return
     */
    @GetMapping(value = "/provider/test")
    public CommonResult<Product> getProductTest() {
        CommonResult<Product> result = new CommonResult<>();
        result.setCode(ResultCodeEnum.SUCCESS.getCode());
        result.setData(new Product(1, "iphone12Max", (float) 0.05));
        result.setException(null);
        result.setMsg("测试数据接口");
        result.setUrl(null);
        result.setSuccess(true);
        return result;
    }

    /**
     * 根据id查询商品返回商品接口
     *
     * @param id
     * @return
     */
    @GetMapping(value = "/provider/product/{id}")
    public CommonResult<Product> getProductById(@PathVariable("id") Integer id) {
        Product product = productService.getProductById(id);
        if (product != null) {
            return new CommonResult<Product>(
                ResultCodeEnum.SUCCESS.getCode(),
                product,
                null,
                "根据id查询商品信息成功!商品名称为:" + product,
                true,
                null);
        }

        return new CommonResult<Product>(
            ResultCodeEnum.DATA_NOT_FOUND.getCode(),
            null,
            null,
            "根据id查询商品信息失败!",
            false,
            null);
    }

    /**
     * 获取所有商品
     *
     * @return
     */
    @GetMapping(value = "/provider/getAll")
    public CommonResult<List<Product>> getAllProducts() {
        List<Product> productList = productService.getProductList();
        if (CollectionUtils.isEmpty(productList)) {
            return new CommonResult<>(
                ResultCodeEnum.DATA_NOT_FOUND.getCode(),
                null,
                null,
                "查询商品列表信息失败!",
                false,
                null
            );
        }
        return new CommonResult<>(
            ResultCodeEnum.SUCCESS.getCode(),
            productList,
            null,
            "查询商品信息成功,所得到的的商品列表为:" + productList,
            true,
            null
        );
    }

    /**
     * 添加商品接口:使用Product参数进行JSON数据插入传递参数
     *
     * @param product
     * @return
     */
    @PostMapping(value = "/provider/insert")
    public Integer insertProduct(@RequestBody Product product) {
        return productService.insertProduct(product);
    }

    /**
     * 抽奖接口:根据抽奖次数及抽奖商品的概率进行返回抽中的商品
     *
     * @return
     */
    @GetMapping(value = "/provider/luckyDraw")
    public CommonResult<Product> luckyDrawProduct() {
        List<Product> productList = productService.getProductList();
        Product product = LotteryUtil.luckyDraw(productList);
        if (product == null) {
            return new CommonResult<>(
                ResultCodeEnum.PARAMS_NULL.getCode(),
                null,
                null,
                "未抽取到商品,谢谢惠顾!",
                false,
                null
            );
        }

        return new CommonResult<>(
            ResultCodeEnum.SUCCESS.getCode(),
            product,
            null,
            "抽奖商品获取成功!抽到的商品名称为:" + product.getProductName(),
            true,
            null
        );
    }
}
View Code

springcloudnacos-consumer-product7800

服务消费方Servcie Feign接口:

【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP
@Component
@FeignClient(value = "nacos-product-provider-6700")
public interface ProductFeignService {
    //测试集成Nacos服务接口
    @GetMapping(value = "/provider/test")
    public CommonResult<Product> getProductTest();

    //接口名与url地址与服务生产者接口名称相同
    @GetMapping(value = "/provider/product/{id}")
    public CommonResult<Product> getProductById(@PathVariable("id") Integer id);

    //获取所有的商品数据
    @GetMapping(value = "/provider/getAll")
    public CommonResult<List<Product>> getAllProducts();

    //编写一个添加商品接口:包含商品名称和中奖率
    @PostMapping(value = "/provider/insert")
    public CommonResult<Product> insertProduct(@RequestBody Product product);

    //编写一个抽奖接口,对添加的商口进行抽奖返回中奖商品
    @GetMapping(value = "/provider/luckyDraw")
    public CommonResult<Product> luckyDrawProduct();
}
View Code

暴露给Swagger2访问的Controller外部接口:

【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP
@RestController
@Api(value = "抽奖接口演示",description = "SpringCloud Nacos测试API接口")
public class ProductConsumerController {
    @Value("${server.port}")
    private String serverPort;

    @Autowired
    private ProductFeignService productFeignService;

    @ApiOperation(value = "获取所有抽奖商品信息", notes = "获取所有抽奖商品getAllProducts接口")
    @GetMapping(value = "/consumer/getAll")
    public CommonResult<List<Product>> getAllProducts(){
        CommonResult<List<Product>> allProducts = productFeignService.getAllProducts();
        String requestUrl = String.format("http://localhost:%s/consumer/getAll", serverPort);
        allProducts.setUrl(requestUrl);
        return allProducts;
    }

    @ApiOperation(value = "获取商品测试test接口", notes = "test接口")
    @GetMapping(value = "/test")
    public CommonResult<Product> getProductTest(){
        CommonResult<Product> productTest = productFeignService.getProductTest();
        String requestUrl = String.format("http://localhost:%s/test", serverPort);
        productTest.setUrl(requestUrl);
        return productTest;
    }

    @RequestMapping(value = "/consumer/getProductById/{id}")
    @ApiOperation(value = "获取对应id商品接口", notes = "根据商品id获取商品信息")
    @ApiImplicitParams({
            @ApiImplicitParam(paramType="query", name = "id", value = "商品id", required = true, dataType = "Integer"),
    })
    public CommonResult<Product> getProductById(@PathVariable("id") Integer id){
        CommonResult<Product> productRes = productFeignService.getProductById(id);
        String requestUrl = String.format("http://localhost:%s/consumer/getProductById/%s", serverPort, id);
        productRes.setUrl(requestUrl);
        return productRes;
    }

    @PostMapping(value = "/consumer/insert")
    @ApiOperation(value = "插入抽奖商品insert接口", notes = "插入商品接口,包含商品信息、商品抽奖概率")
    @ApiImplicitParams({
            @ApiImplicitParam(paramType="insert", name = "id", value = "商品", required = true, dataType = "Product"),
    })
    public CommonResult<Product> insertProduct(@RequestBody Product product){
        CommonResult<Product> result = productFeignService.insertProduct(product);
        String requestUrl = String.format("http://localhost:%s//consumer/insert", serverPort);
        result.setUrl(requestUrl);
        return result;
    }

    //编写一个抽奖接口,对添加的商口进行抽奖返回中奖商品
    @GetMapping(value = "/consumer/luckyDraw")
    @ApiOperation(value = "抽奖接口", notes = "抽奖接口,根据概率返回中奖商品")
    public CommonResult<Product> luckyDrawProduct(){
        CommonResult<Product> commonRes = productFeignService.luckyDrawProduct();
        String requestUrl = String.format("http://localhost:%s//consumer/luckyDraw", serverPort);
        commonRes.setUrl(requestUrl);
        return commonRes;
    }
}
View Code

2.3.抽奖接口实现

主要用到的抽奖商品类:

@Data
@AllArgsConstructor
@NoArgsConstructor
@ApiModel("用户实体类")
public class Product
{
    @ApiModelProperty("主键id")
    private Integer id;   //主键id
    @ApiModelProperty("商品名称")
    private String productName;  //商品名称
    @ApiModelProperty("中奖率")
    private float winRate;  //中奖率 -- 请用户输入小数点后两位
}

公共接口返回值封装类:

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {
    private Integer code;
    private T data;
    private String exception;
    private String msg;
    private boolean success;
    private String url;
}

返回结果枚举类:

@Getter
public enum ResultCodeEnum {
    /**
     * 返回结果枚举,每个枚举代表着一个状态
     */
    SUCCESS(200, "操作成功!"),
    ERROR(400, "操作失败!"),
    DATA_NOT_FOUND(401, "查询失败!"),

    PARAMS_NULL(402, "参数不能为空!"),

    PARAMS_ERROR(405, "参数不合法!"),

    NOT_LOGIN(403, "当前账号未登录!");

    private Integer code;
    private String msg;

    ResultCodeEnum(Integer code, String msg) {
        this.code = code;
        this.msg = msg;
    }
}

主要的抽奖接口实现工具类:

public class LotteryUtil {
    /**
     * 抽奖设计接口:
     * 产生一个随机数,0-5为一等奖商品,6-15为二等奖商品,16-40为三等奖商品,41-100为谢谢惠顾
     * 在比较的时候,比较随机数(百分比)与获取商品的概率(百分比)的绝对值,40%以下的才中奖
     * 之后计算随机数与中奖概率的绝对值,选择绝对值相差最小的那个为中奖商品
     * @param products
     * @return
     */
    public static Product luckyDraw(List<Product> products) {
        //1.产生一个随机数
        int probabilityCount = 100;
        int randomNum = (int) (Math.random()* probabilityCount);
        //2.41-100表示不中奖
        if(randomNum > 40){
            return null;
        }

        Map<String, Product> map = new HashMap<>();
        List<Integer> list = new ArrayList<>();
        for (Product product : products) {
            int intValue = new BigDecimal(product.getWinRate() * 100).intValue();
            int absVal = Math.abs(randomNum - intValue);
            list.add(absVal);
        }
        Integer min = Collections.min(list);

        for (Product product : products) {
            int value = new BigDecimal(product.getWinRate() * 100).intValue();
            if(Math.abs(randomNum - value) == min){
                return product;
            }
        }
        return null;
    }
}

 Nacos微服务注册中心:

【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP

使用Swagger接口测试返回中奖结果:

抽奖算法需求:抽奖接口按照添加商品接口的名称和中奖率进行抽奖返回中奖商品,中奖率小于等于40%。即有可能按实际概率来抽奖返回不中奖情况。

抽奖算法这里实际的情况应该是按照插入奖品的实际概率0.15来计算真实的抽奖概率,本人这里实现的比较简单,具体的抽奖概率可以

根据实际情况进行优化,也欢迎博友提出相对应的算法建议。

【分布式】-- 基于Nacos、OpenFeign搭建的微服务抽奖系统后台小案例-LMLPHP

博客示例及相关代码已上传至GitHub:

LotteryDraw

05-30 13:54