初始化项目

首先创建一个父项目。父项目的pom如图所示：

<?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>org.example</groupId>
    <artifactId>e-commerce-springcloud</artifactId>
    <version>1.0-SNAPSHOT</version>

    <packaging>pom</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.1.RELEASE</version>
    </parent>

    <properties>
        <!-- Spring Cloud Hoxton.SR8 依赖 -->
        <spring-cloud.version>Hoxton.SR8</spring-cloud.version>
        <!-- spring cloud alibaba 依赖 -->
        <spring-cloud-alibaba.version>2.2.4.RELEASE</spring-cloud-alibaba.version>
    </properties>

    <dependencies>
        <!-- lombok 工具通过在代码编译时期动态的将注解替换为具体的代码,
        IDEA 需要添加 lombok 插件 -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.18</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.11</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-collections4</artifactId>
            <version>4.4</version>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.6.0</version>
        </dependency>
        <!-- 引入jwt-->
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt-api</artifactId>
            <version>0.10.5</version>
        </dependency>
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt-impl</artifactId>
            <version>0.10.5</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt-jackson</artifactId>
            <version>0.10.5</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.47</version>
        </dependency>
    </dependencies>

    <!-- 项目依赖管理 父项目只是声明依赖，子项目需要写明需要的依赖(可以省略版本信息) -->
    <dependencyManagement>
        <dependencies>
            <!-- spring cloud 依赖 -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <!-- spring cloud alibaba 依赖 -->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring-cloud-alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <!-- 配置远程仓库 -->
    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
</project>

完成通用模块的编写：

通用模块pom文件示例：

<?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">
    <parent>
        <artifactId>e-commerce-springcloud</artifactId>
        <groupId>com.taluohui.ecommerce</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>e-commerce-common</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>e-commerce-common</name>
    <description>通用模块</description>
</project>

添加package-info占位文件

统一通用响应对象CommonResponse

创建vo包，并添加统一通用响应对象CommonResponse

/**
 * <h1>通用响应对象定义</h1>
 * {
 *     “code”: 0,
 *     "message": "",
 *     "data": {}
 * }
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class CommonResponse<T> implements Serializable {
    /** 错误码 */
    private Integer code;

    /** 错误消息 */
    private String message;

    /** 泛型响应数据 */
    private T data;

    public CommonResponse(Integer code, String message) {
        this.code = code;
        this.message = message;
    }
}

通用配置模块初始化：

通用配置模块pom文件示例：

<?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">
    <parent>
        <artifactId>e-commerce-springcloud</artifactId>
        <groupId>com.taluohui.ecommerce</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>e-commerce-mvc-config</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <!--模块名及描述信息-->
    <name>e-commerce-mvc-config</name>
    <description>通用配置模块</description>

    <dependencies>
        <!--引入Web功能-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.taluohui.ecommerce</groupId>
            <artifactId>e-commerce-common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>
</project>

添加package-info占位文件

实现统一响应

/**
 * <h1>实现统一响应</h1>
 */
@RestControllerAdvice(value = "com.taluohui.ecommerce")
public class CommonResponseDataAdvice implements ResponseBodyAdvice<Object> {

    /**
     * <h2>判断是否需要对响应进行处理</h2>
     */
    @Override
    @SuppressWarnings("all")
    public boolean supports(MethodParameter methodParameter, Class<? extends HttpMessageConverter<?>> aClass) {
        if(methodParameter.getDeclaringClass().isAnnotationPresent(IgnoreResponseAdvice.class)) {
            return false;
        }
        if(methodParameter.getMethod().isAnnotationPresent(IgnoreResponseAdvice.class)) {
            return false;
        }
        return true;
    }

    @Override
    @SuppressWarnings("all")
    public Object beforeBodyWrite(Object o, MethodParameter methodParameter, MediaType mediaType,
                                  Class<? extends HttpMessageConverter<?>> aClass,
                                  ServerHttpRequest serverHttpRequest,
                                  ServerHttpResponse serverHttpResponse) {
        //定义最终的返回对象
        CommonResponse<Object> response = new CommonResponse<>(0, "");

        if (null == o) {
            return response;
        } else if (o instanceof CommonResponse) {
            response = (CommonResponse<Object>) o;
        } else {
            response.setData(o);
        }

        return response;
    }
}

全局异常捕获处理

/**
 * <h1>全局异常捕获处理</h1>
 */
@Slf4j
@RestControllerAdvice
public class GlobalExceptionAdvice {

    @ExceptionHandler(value = Exception.class)
    public CommonResponse<String> handlerCommerceException(
            HttpServletRequest req, Exception ex)
    {
        CommonResponse<String> response = new CommonResponse<>(-1, "business error");
        response.setData(ex.getMessage());
        log.error("commerce service has error: [{}]", ex.getMessage(), ex);
        return response;
    }
}