【SpringBoot】还不会SpringBoot项目模块分层？来这手把手教你

本是古典何须时尚 2024-05-11 09:05 86阅读 0赞

#### 文章目录 ####

*   *  前言
     *   *  ?缘由
         *  ⏲️本文阅读时长
         *  ?主要目标
         *  ??试用人群
         *  ?快速链接
         *  ?水图
     *  正文
     *   *  ?1.IDEA新建项目
         *  ?2.创建子模块-dependencies(依赖层)
         *   *  ?重点
         *  ?3.创建子模块-main(主启动层)
         *   *  ?重点
         *  ?4.创建子模块-module(模块层)
         *  ?5.创建chat-boot-module模块下对应功能分层
         *  ?6.实际流程填充
         *  ?7.示例DB更新
         *  ?8.访问测试
     *  总结
     *  写在最后

### 前言 ###

#### ?缘由 ####

经常看到网上很多**优秀的开源项目中，代码简洁，模块分层完美**。反观自己代码层级混乱，，却不知如何整理分层。此文**手把手教你一步一步创建模块**，左手右手一个慢动作。结合本人实际开发及个人项目中**分层思路的分享，大神请勿喷**。

#### ⏲️本文阅读时长 ####

> 约25分钟

#### ?主要目标 ####

1.  **熟练掌握SpringBoot项目分层思路**，丝滑拆分模块
2.  **熟悉代码层级依赖**，规范化管理模块分布
3.  手把手实战学习，理论实践相结合

#### ??试用人群 ####

1.  对于Springboot熟悉但是不知道合理分层**小白**
2.  有自己分层思路可以互相分享学习

#### ?快速链接 ####

公众号：**JavaDog程序狗**  
**在公众号，发送【分层】 ，无任何套路即可获得**

![在这里插入图片描述][3b92f4f12dfe4883807d25c4f8732e17.png]  
或访问[https://blog.javadog.net/archives/boot-module][https_blog.javadog.net_archives_boot-module]

#### ?水图 ####

> 下图反面教材，传统单体应用，结构臃肿

![在这里插入图片描述][424e7f4161ca448595343841825cf948.png]

> 下图分层截选自本人的一个小项目，模块清晰，分工明确

![在这里插入图片描述][d6534123b4f842ccbc673ee7dd797143.png]

> 我们要实现的小栗子的分层

![在这里插入图片描述][d9db6628b4c640c2b47e851b91c5ef4a.png]

### 正文 ###

#### ?1.IDEA新建项目 ####

> 起名第一步，一个好名字,说不定是个好的开始

假如我们的项目是个**聊天相关**的项目，英文对应**chat**,所以定义项目名为**chat-boot**，其他的以此效仿

> 点击New->project

![在这里插入图片描述][f4da341101d344f2b0b56ba11cf48082.png]

> 选择**Maven项**目，并选择**合适JDK版本**,点击Next

![在这里插入图片描述][68ac5252e085483d84cfde636f77f4a5.png]

> 录入项目名称，并填写GAV坐标，点击Finish

![在这里插入图片描述][8ec76c9dbb02441a905e2f238963e6b4.png]

> 删除无用文件及目录，如src目录和\*.iml文件

![在这里插入图片描述][15d2e2dd0c6e4eabbcfb30318ba91d9b.png]

> 删除后项目目录

![在这里插入图片描述][43ae0cc7e979461191998d8883e8f0e6.png]

> 修改pom.xml中依赖，增加spring-boot-starter-parent

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

![在这里插入图片描述][c95a07cb3b5e491eaccb46fe49a07d9c.png]

--------------------

#### ?2.创建子模块-dependencies(依赖层) ####

> 右击项目chat-boot，new ->Moudle新建模块chat-boot-dependencies

![在这里插入图片描述][cd49e2cde7ad4e3c8e094a449e7d7344.png]

> 选择对应Module SDK版本，本人选择jdk1.8

![在这里插入图片描述][3674c1deacca45b19165fa382d0df590.png]

> 填写子模块名 chat-boot-dependencies，然后检查对应GAV，点击Finish

![在这里插入图片描述][0b021dc5545145749a297b927af06e62.png]

> 生成子模块**chat-boot-dependencies**如下图

![在这里插入图片描述][ec7e0ab0034b43aeb2c4dfe2441c0a96.png]

> 删除**chat-boot-dependencies**下无用文件及目录，如src目录，删除无用目录如下

![在这里插入图片描述][b7622a9e5e5a49c6ac63c053f8eb25dc.png]

> 完善**chat-boot-dependencies**下pom.xml依赖， **常用依赖**放入，作为**依赖主体**，以下是本狗常用依赖，可酌情选择；**记得把packaging改为pom**

<?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>chat-boot</artifactId>
            <groupId>net.javadog.chat</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>chat-dependencies</artifactId>
    
        <packaging>pom</packaging>
    
        <properties>
            <maven.compiler.source>8</maven.compiler.source>
            <maven.compiler.target>8</maven.compiler.target>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <mysql-connector-java.version>8.0.17</mysql-connector-java.version>
            <druid.version>1.1.21</druid.version>
            <mybatis-plus.version>3.4.1</mybatis-plus.version>
            <fastjson.version>1.2.75</fastjson.version>
            <hutool.version>5.5.8</hutool.version>
            <lombok.versin>1.18.12</lombok.versin>
            <easypoi.version>4.2.0</easypoi.version>
            <springfox-swagger2.version>2.9.2</springfox-swagger2.version>
            <springfox-swagger-ui.version>2.9.2</springfox-swagger-ui.version>
            <knife4j.version>2.0.4</knife4j.version>
            <weixin.version>4.4.5.B</weixin.version>
            <shiro.version>1.3.2</shiro.version>
            <jwt.version>3.2.0</jwt.version>
        </properties>
    
        <dependencyManagement>
            <dependencies>
                
                <dependency>
                    <groupId>com.baomidou</groupId>
                    <artifactId>mybatis-plus-boot-starter</artifactId>
                    <version>${mybatis-plus.version}</version>
                </dependency>
    
                
                <dependency>
                    <groupId>mysql</groupId>
                    <artifactId>mysql-connector-java</artifactId>
                    <version>${mysql-connector-java.version}</version>
                </dependency>
    
                
                <dependency>
                    <groupId>com.alibaba</groupId>
                    <artifactId>druid</artifactId>
                    <version>${druid.version}</version>
                </dependency>
    
                
                <dependency>
                    <groupId>com.alibaba</groupId>
                    <artifactId>fastjson</artifactId>
                    <version>${fastjson.version}</version>
                </dependency>
    
                
                <dependency>
                    <groupId>cn.hutool</groupId>
                    <artifactId>hutool-all</artifactId>
                    <version>${hutool.version}</version>
                </dependency>
    
                
                <dependency>
                    <groupId>org.projectlombok</groupId>
                    <artifactId>lombok</artifactId>
                    <version>${lombok.versin}</version>
                </dependency>
    
                
                <dependency>
                    <groupId>io.springfox</groupId>
                    <artifactId>springfox-swagger2</artifactId>
                    <version>${springfox-swagger2.version}</version>
                </dependency>
    
                
                <dependency>
                    <groupId>io.springfox</groupId>
                    <artifactId>springfox-swagger-ui</artifactId>
                    <version>${springfox-swagger-ui.version}</version>
                </dependency>
    
                
                <dependency>
                    <groupId>com.github.xiaoymin</groupId>
                    <artifactId>knife4j-spring-boot-starter</artifactId>
                    <version>${knife4j.version}</version>
                </dependency>
    
                
                <dependency>
                    <groupId>cn.afterturn</groupId>
                    <artifactId>easypoi-base</artifactId>
                    <version>${easypoi.version}</version>
                </dependency>
    
                
                <dependency>
                    <groupId>com.github.binarywang</groupId>
                    <artifactId>weixin-java-miniapp</artifactId>
                    <version>${weixin.version}</version>
                </dependency>
    
                
                <dependency>
                    <groupId>org.apache.shiro</groupId>
                    <artifactId>shiro-spring</artifactId>
                    <version>${shiro.version}</version>
                </dependency>
    
                
                <dependency>
                    <groupId>com.auth0</groupId>
                    <artifactId>java-jwt</artifactId>
                    <version>${jwt.version}</version>
                </dependency>
            </dependencies>
        </dependencyManagement>
    </project>

##### ?重点 #####

此处用的标签是 **dependencyManagement**，

> **dependencyManagement只是声明依赖，并不实现引入**，因此**子项目需要显示的声明需要用的依赖**。如果**不在子项目中声明依赖，是不会从父项目中继承下来**；**只有在子项目中写了该依赖项，并且没有指定具体版本，才会从父项目中继承该项**，并且version和scope都读取自父pom;另外如果子项目中指定了版本号，那么会使用子项目中指定的jar版本。

--------------------

#### ?3.创建子模块-main(主启动层) ####

> 右击项目chat-boot，new ->Moudle新建模块chat-boot-main

![在这里插入图片描述][f42238eb21664c589834304c56318eb9.png]

> 选择对应Module SDK版本，本狗选择jdk1.8，点击Next

![在这里插入图片描述][b1f72e4792ff4fa68b16cfe3889650e4.png]

> 填写子模块名 chat-boot-main，然后检查对应GAV，点击Finish

![在这里插入图片描述][df012065abbc4adb9757decb12c658e2.png]

> 生成子模块chat-boot-main如下图

![在这里插入图片描述][83222a8120bf4295a73c415a5633c27c.png]

> 完善chat-boot-main模块下pom.xml中依赖

1.  引入必要依赖
2.  完善profiles标签中环境相关
3.  配置build标签中插件

<?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>chat-boot</artifactId>
            <groupId>net.javadog.chat</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>chat-boot-main</artifactId>
    
        <properties>
            <maven.compiler.source>8</maven.compiler.source>
            <maven.compiler.target>8</maven.compiler.target>
        </properties>
    
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>net.javadog.chat</groupId>
                    <artifactId>chat-boot-dependencies</artifactId>
                    <version>1.0-SNAPSHOT</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>
    
        <dependencies>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
            </dependency>
            
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger2</artifactId>
            </dependency>
            
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger-ui</artifactId>
            </dependency>
            
            <dependency>
                <groupId>com.github.xiaoymin</groupId>
                <artifactId>knife4j-spring-boot-starter</artifactId>
            </dependency>
        </dependencies>
    
        <build>
            <finalName>chat</finalName>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <executions>
                        <execution>
                            <goals>
                                <goal>repackage</goal>
                            </goals>
                        </execution>
                    </executions>
                    <configuration>
                        <fork>true</fork>
                    </configuration>
                </plugin>
            </plugins>
            <resources>
                <resource>
                    <directory>src/main/webapp</directory>
                    <filtering>false</filtering>
                </resource>
                <resource>
                    <directory>src/main/resources</directory>
                    <filtering>true</filtering>
                </resource>
                <resource>
                    <directory>src/main/java</directory>
                    <includes>
                        <include>**/*.xml</include>
                    </includes>
                </resource>
            </resources>
        </build>
    
        <profiles>
            <profile>
                <id>local</id>
                <properties>
                    <spring.active>local</spring.active>
                </properties>
                <activation>
                    <activeByDefault>true</activeByDefault>
                </activation>
            </profile>
            <profile>
                <id>dev</id>
                <properties>
                    <spring.active>dev</spring.active>
                </properties>
            </profile>
            <profile>
                <id>prod</id>
                <properties>
                    <spring.active>prod</spring.active>
                </properties>
            </profile>
        </profiles>
    </project>

##### ?重点 #####

*  配置引入依赖chat-boot-dependencies,用作此模块依赖引入

<dependencyManagement>
         <dependencies>
             <dependency>
                 <groupId>net.javadog.chat</groupId>
                 <artifactId>chat-boot-dependencies</artifactId>
                 <version>1.0-SNAPSHOT</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
         </dependencies>
    </dependencyManagement>

*  配置build标签用于完善插件plugins，其中包含maven-compiler-plugin和maven-resources-plugin

<build>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.1</version>
                    <configuration>
                        <source>${java.version}</source>
                        <target>${java.version}</target>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>2.6</version>
                    <configuration>
                        <delimiters>
                            <delimiter>@</delimiter>
                        </delimiters>
                        <useDefaultDelimiters>false</useDefaultDelimiters>
                    </configuration>
                </plugin>
            </plugins>
            <resources>
                <resource>
                    <directory>src/main/webapp</directory>
                    <filtering>false</filtering>
                </resource>
                <resource>
                    <directory>src/main/resources</directory>
                    <filtering>true</filtering>
                </resource>
                <resource>
                    <directory>src/main/java</directory>
                    <includes>
                        <include>**/*.xml</include>
                    </includes>
                </resource>
            </resources>
        </build>

*  配置profiles环境变量标签，用于方便打包切换，本狗设置了 local、dev、prod三种环境

<profiles>
         <profile>
             <id>local</id>
             <properties>
                 <spring.active>local</spring.active>
             </properties>
             <activation>
                 <activeByDefault>true</activeByDefault>
             </activation>
         </profile>
         <profile>
             <id>dev</id>
             <properties>
                 <spring.active>dev</spring.active>
             </properties>
         </profile>
         <profile>
             <id>prod</id>
             <properties>
                 <spring.active>prod</spring.active>
             </properties>
         </profile>
     </profiles>

操作可在IDEA右上角方便切换环境  
![在这里插入图片描述][594563da87114481a1af2cd4fdd4308f.png]  
?切记一定主动Reload一下Maven依赖  
?切记一定主动Reload一下Maven依赖  
?切记一定主动Reload一下Maven依赖  
![在这里插入图片描述][1ec68ca0e80847668e116dee7ca39d75.png]

> 在chat-boot-main模块中加入启动类，在src/main/java下右键New=>Java Class

![在这里插入图片描述][4108344dc506443ba113cc461ffbcfc2.png]

> 录入启动类名ChatApplication

![在这里插入图片描述][f2d2cda1ea254c999c259a7fa2b5b322.png]

> 完善ChatApplication启动类代码

package net.javadog.chat;
    
    import com.github.xiaoymin.knife4j.spring.annotations.EnableKnife4j;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.ServletComponentScan;
    import org.springframework.context.ConfigurableApplicationContext;
    import org.springframework.core.env.Environment;
    import springfox.documentation.swagger2.annotations.EnableSwagger2;
    
    import java.net.InetAddress;
    import java.net.UnknownHostException;
    
    /**
     * @author: hdx
     * @Date: 2023-01-28 11:24
     * @version: 1.0
     **/
    @SpringBootApplication
    @ServletComponentScan
    @Slf4j
    @EnableSwagger2
    @EnableKnife4j
    public class ChatApplication {
        
        public static void main(String[] args) throws UnknownHostException {
        
            // 启动类
            ConfigurableApplicationContext application = SpringApplication.run(ChatApplication.class, args);
            // 打印基础信息
            info(application);
        }
    
        static void info(ConfigurableApplicationContext application) throws UnknownHostException {
        
            Environment env = application.getEnvironment();
            String ip = InetAddress.getLocalHost().getHostAddress();
            String port = env.getProperty("server.port");
            String active = env.getProperty("spring.profiles.active");
            String contextPath = env.getProperty("server.servlet.context-path");
            if (contextPath == null) {
        
                contextPath = "";
            }
            log.info("\n----------------------------------------------------------\n\t" +
                    "欢迎访问  \thttps://blog.javadog.net\n\t" +
                    "示例程序【" + active + "】环境已启动! 地址如下:\n\t" +
                    "Local: \t\thttp://localhost:" + port + contextPath + "\n\t" +
                    "External: \thttp://" + ip + ':' + port + contextPath + '\n' +
                    "Swagger文档: \thttp://" + ip + ":" + port + contextPath + "/doc.html\n" +
                    "----------------------------------------------------------");
        }
    }

> 配置application.yml文件

![在这里插入图片描述][69623ac11ed44a9fbd49568522e4f148.png]  
**application.yml**

#============================#
    # server 配置
    #============================#
    server:
      port: 82
      max-http-header-size: 10240
      servlet:
        context-path: /chat/v1
    
    #============================#
    # spring 配置
    #============================#
    spring:
      application:
        # 应用名
        name: chat
      profiles:
        active: @spring.active@
      servlet:
        multipart:
          max-request-size: 100MB
          max-file-size: 100MB
      jackson:
        time-zone: GMT+8
        date-format: yyyy-MM-dd HH:mm:ss.SSS
        locale: zh_CN
        serialization:
          # 格式化输出
          indent_output: false
      main:
        allow-circular-references: true
        #解决swagger版本路径不兼容问题
      mvc:
        pathmatch:
          matching-strategy: ant_path_matcher
    
    #============================#
    # mybatisplus 配置
    #============================#
    mybatis-plus:
      mapper-locations: classpath:mapper/*.xml
      configuration:
        map-underscore-to-camel-case: true
        cache-enabled: true
        lazy-loading-enabled: true
        multiple-result-sets-enabled: true
        log-impl: org.apache.ibatis.logging.nologging.NoLoggingImpl
      global-config:
        banner: false
        db-config:
          id-type: assign_id
          table-underline: true
        enable-sql-runner: true
          #数据库类型
        db-type: MYSQL
      configuration-properties:
        prefix:
        #如果数据库为postgresql，则需要配置为blobType: BINARY
        blobType: BLOB
        #如果数据库为oracle或mssql，则需要配置为boolValue: 1
        boolValue: true
    
    #============================#
    # logging 配置
    #============================#
    logging:
      level:
        root: info
      file:
        path: /root/javadog/chat/logs/${
        spring.application.name}/
        name: ${
        spring.application.name}
      logback:
        rollingpolicy:
          max-history: 7
          max-file-size: 10MB
    
    #============================#
    # file 配置
    #============================#
    file:
      # 静态附件前缀
      static-prefix: attach
      # 上传的文件对外暴露的访问路径
      access-path-pattern: /${
        file.static-prefix}/**
      # 文件上传目录
      upload-folder: /root/javadog/chat/
      # 文件上传最大
      max-post-size: 10

**application-local.yml**

#服务配置
    server:
      port: 8001
      max-http-header-size: 10240
    
    # Mysql数据库
    spring:
      datasource:
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://localhost:3306/chat-boot?autoReconnect=true&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=CONVERT_TO_NULL&useSSL=false&serverTimezone=CTT&nullCatalogMeansCurrent=true
        username: root
        password: root
      redis:
        host: localhost
        port: 6379
        password:

**application-dev.yml**

#服务配置
    server:
      port: 7001
      max-http-header-size: 10240
    
    # mybatisplus 配置
    mybatis-plus:
      configuration:
        log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

**application-prod.yml**

#服务配置
    server:
      port: 8005

?顺便加一下logback-spring.xml 日志文件

<?xml version="1.0" encoding="UTF-8" ?>
    <configuration scan="true" scanPeriod="60 seconds" debug="false">
        <conversionRule conversionWord="clr" converterClass="org.springframework.boot.logging.logback.ColorConverter"/>
        <conversionRule conversionWord="wex"
                        converterClass="org.springframework.boot.logging.logback.WhitespaceThrowableProxyConverter"/>
        <conversionRule conversionWord="wEx"
                        converterClass="org.springframework.boot.logging.logback.ExtendedWhitespaceThrowableProxyConverter"/>
        <property name="CONSOLE_LOG_PATTERN"
                  value="${CONSOLE_LOG_PATTERN:-%clr(%d{yyyy-MM-dd HH:mm:ss.SSS}){faint} %clr(${LOG_LEVEL_PATTERN:-%5p}) %clr(${PID:- }){magenta} %clr(---){faint} %clr([%15.15t]){faint} %clr(%-40.40logger{39}){cyan} %clr(:){faint} %m%n${LOG_EXCEPTION_CONVERSION_WORD:-%wEx}}"/>
        <property name="FILE_LOG_PATTERN"
                  value="${FILE_LOG_PATTERN:-%d{yyyy-MM-dd HH:mm:ss.SSS} ${LOG_LEVEL_PATTERN:-%5p} ${PID:- } --- [%t] %-40.40logger{39} : %m%n${LOG_EXCEPTION_CONVERSION_WORD:-%wEx}}"/>
    
        <springProperty scope="context" name="application.name" source="spring.application.name" defaultValue="javadog"/>
        <springProperty scope="context" name="logging.path" source="logging.file.path" defaultValue="logs"/>
        <springProperty scope="context" name="logging.file.max-size" source="logging.logback.rollingpolicy.max-size"
                        defaultValue="10MB"/>
        <springProperty scope="context" name="logging.file.max-history" source="logging.logback.rollingpolicy.max-history"
                        defaultValue="30"/>
        <contextName>${application.name}</contextName>
    
        <springProfile name="dev,prod">
            
            <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
                <encoder>
                    <pattern>${CONSOLE_LOG_PATTERN}</pattern>
                </encoder>
            </appender>
            <root level="info">
                <appender-ref ref="console"/>
            </root>
        </springProfile>
    
        <springProfile name="dev,test,prod">
            
            <appender name="file-info" class="ch.qos.logback.core.rolling.RollingFileAppender">
                <file>${logging.path}/info/${application.name}-info.log</file>
                <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
                    <fileNamePattern>${logging.path}/info/${application.name}-info.%d{yyyy-MM-dd}.%i.log</fileNamePattern>
    
                    <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                        <maxFileSize>${logging.file.max-size}</maxFileSize>
                    </timeBasedFileNamingAndTriggeringPolicy>
                    
                    <maxHistory>${logging.file.max-history}</maxHistory>
                </rollingPolicy>
                
                <append>true</append>
                <encoder>
                    <pattern>${FILE_LOG_PATTERN}</pattern>
                </encoder>
            </appender>
            <appender name="file-warn" class="ch.qos.logback.core.rolling.RollingFileAppender">
                <filter class="ch.qos.logback.classic.filter.LevelFilter">
                    <level>warn</level>
                    <onMatch>ACCEPT</onMatch>
                    <onMismatch>DENY</onMismatch>
                </filter>
                <file>${logging.path}/warn/${application.name}-warn.log</file>
                <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
                    <fileNamePattern>${logging.path}$/warn/${application.name}-warn.%d{yyyy-MM-dd}.%i.log</fileNamePattern>
                    <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                        <maxFileSize>${logging.file.max-size}</maxFileSize>
                    </timeBasedFileNamingAndTriggeringPolicy>
                    
                    <maxHistory>${logging.file.max-history}</maxHistory>
                </rollingPolicy>
                <encoder>
                    <pattern>${FILE_LOG_PATTERN}</pattern>
                </encoder>
            </appender>
            <appender name="file-error" class="ch.qos.logback.core.rolling.RollingFileAppender">
                <filter class="ch.qos.logback.classic.filter.LevelFilter">
                    <level>error</level>
                    <onMatch>ACCEPT</onMatch>
                    <onMismatch>DENY</onMismatch>
                </filter>
                <file>${logging.path}/error/${application.name}-error.log</file>
                <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
                    <fileNamePattern>${logging.path}/error/${application.name}-error.%d{yyyy-MM-dd}.%i.log</fileNamePattern>
                    <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                        <maxFileSize>${logging.file.max-size}</maxFileSize>
                    </timeBasedFileNamingAndTriggeringPolicy>
                    
                    <maxHistory>${logging.file.max-history}</maxHistory>
                </rollingPolicy>
                <encoder>
                    <pattern>${FILE_LOG_PATTERN}</pattern>
                </encoder>
            </appender>
    
            <root level="INFO">
                <appender-ref ref="file-info"/>
                <appender-ref ref="file-warn"/>
                <appender-ref ref="file-error"/>
            </root>
        </springProfile>
    
    </configuration>

> 启动一下项目试试，启动如下证明成功。如果报错少依赖请再拉一下Maven依赖！！！

![在这里插入图片描述][128e83eb45a54374a608911de785d2eb.png]  
![在这里插入图片描述][470d5ece4c8048e99fe2014ae5b2a886.png]

--------------------

#### ?4.创建子模块-module(模块层) ####

> 右击项目chat-boot，new ->Moudle新建模块chat-boot-module

![在这里插入图片描述][dc76e2a8982d4380973b73538a89e043.png]

> 填写子模块名 chat-boot-module，然后检查对应GAV，点击Finish

![在这里插入图片描述][02360cf7509e4350af1306fd8922a078.png]

> 生成子模块**chat-boot-module**如下图

![在这里插入图片描述][1f35b0a49d6d4eacb47ab422ae87bf9b.png]

> 删除**chat-boot-module**下无用文件及目录，如src目录，删除无用目录如下

![在这里插入图片描述][5f058ac60bd646a289521f571cf8471a.png]

> 自此外部大框架初步搭建成功

![在这里插入图片描述][4b409ee9c036446583f5dde75605cf78.png]

> 完善chat-boot-module下pom.xml依赖，如lombok，web等必要依赖

**一定要重新拉取依赖！**  
**一定要重新拉取依赖！**  
**一定要重新拉取依赖！**

![在这里插入图片描述][d5e49ab39e9e49b791245cb2a71015c1.png]

--------------------

#### ?5.创建chat-boot-module模块下对应功能分层 ####

> 目前本狗分为如下6层

*  common-共通层
 *  controller-控制器层
 *  dao-数据持久层
 *  dto-数据传输对象层
 *  entity-实体层
 *  service-业务逻辑层

**依次按照上述添加模块方式进行新增子模块，本狗如下示例一个，其余都如法炮制**

> 右击项目chat-boot-module，new ->Moudle新建模块chat-boot-common

**一定看清楚父模块是否正确**  
**一定看清楚父模块是否正确**  
**一定看清楚父模块是否正确**

![在这里插入图片描述][fba05ec151524d4f9651d901d5052052.png]

> 确认父级模块后，点击Finish，生成chat-boot-common模块

![在这里插入图片描述][3c455b77d8134d05a44e151e83a96d0e.png]

> 依次按照上述方法，新建其他模块

**chat-boot-controller**模块

![在这里插入图片描述][bb29e09e0f3d4c179563a206570a90c0.png]

**chat-boot-dao**模块  
![在这里插入图片描述][55d72e807d814b16aa1e74fb4798d618.png]

**chat-boot-dto**模块  
![在这里插入图片描述][582bdf6b1e134a398c8924657d2b83a7.png]

**chat-boot-entity**模块  
![在这里插入图片描述][33180f8855974179bc0990444d77b152.png]

**chat-boot-service**模块  
![在这里插入图片描述][1eb3150e26764881af61bd431bcc95a4.png]

> 总体模块雏形基本完成

![在这里插入图片描述][ea39880791f248b4b90c246c78f90791.png]

#### ?6.实际流程填充 ####

*  模拟正常**前端请求**到**后台服务调用过程**，进行实际代码补充

> 在chat-boot-entity下新建实体类User，在src/main/java下右键New=>Java Class，录入包名及类名

![在这里插入图片描述][13aa106c81ed4527a9c6450410528782.png]

package net.javadog.chat.entity;
    
    import lombok.Data;
    
    /**
     * @author: hdx
     * @Date: 2023-01-28 14:26
     * @version: 1.0
     **/
    @Data
    public class User {
        
    
        private Long id;
    
        private String username;
    
        private String idCard;
    }

--------------------

> 在chat-boot-dto下新建目**request和response**，分别代表**请求传输对象和返回传输对象**，并分别在目录下创建UserRequest.java和UserResponse.java

![在这里插入图片描述][1cdd8eed3329478092e68580ef3d6550.png]

package net.javadog.chat.request;
    
    import lombok.Data;
    
    /**
     * @author: hdx
     * @Date: 2023-01-28 14:59
     * @version: 1.0
     **/
    @Data
    public class UserRequest {
        
    
        private Long id;
    
        private String username;
    }

package net.javadog.chat.response;
    
    import lombok.Data;
    
    /**
     * @author: hdx
     * @Date: 2023-01-28 14:59
     * @version: 1.0
     **/
    @Data
    public class UserResponse {
        
    
        private Long id;
    
        private String username;
    }

--------------------

> 在chat-boot-dao下修改chat-boot-dao模块下修改pom.xml文件依赖，引入chat-boot-entity;并增对应UserMapper.java  
> ![在这里插入图片描述][5efa985515ae4cbba8ab95541044ed37.png]

package net.javadog.chat.mapper;
    
    import com.baomidou.mybatisplus.core.mapper.BaseMapper;
    import net.javadog.chat.entity.User;
    
    /**
     * 用户mapper
     *
     * @author: hdx
     * @Date: 2023-01-10 11:43
     * @version: 1.0
     **/
    public interface UserMapper extends BaseMapper<User> {
        
    }

--------------------

> 在chat-boot-service下新建目录service和impl，并在对应目录下新建UserService.java和UserServiceImpl.java，并修改chat-boot-service模块下修改pom.xml文件依赖，引入chat-boot-dto,chat-boot-dao

![在这里插入图片描述][8e438042de6b4f009bb58b46a57adbf1.png]

package net.javadog.chat.service;
    
    import com.baomidou.mybatisplus.extension.service.IService;
    import net.javadog.chat.entity.User;
    
    /**
     * 用户接口
     *
     * @author: hdx
     * @Date: 2023-01-10 11:53
     * @version: 1.0
     **/
    public interface UserService extends IService<User> {
        
    
    }

package net.javadog.chat.service.impl;
    
    import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
    import net.javadog.chat.entity.User;
    import net.javadog.chat.mapper.UserMapper;
    import net.javadog.chat.service.UserService;
    import org.springframework.stereotype.Service;
    
    /**
     * 用户接口实现类
     *
     * @author: hdx
     * @Date: 2023-01-10 11:55
     * @version: 1.0
     **/
    @Service
    public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
        
    
    }

--------------------

> 在chat-boot-controller创建UserController.java,并修改chat-boot-controller模块下修改pom.xml文件依赖，引入chat-boot-dto,chat-boot-service

![在这里插入图片描述][af877cb82b97411d930b44244922b956.png]

package net.javadog.chat.controller;
    
    import cn.hutool.core.bean.BeanUtil;
    import io.swagger.annotations.Api;
    import io.swagger.annotations.ApiOperation;
    import net.javadog.chat.entity.User;
    import net.javadog.chat.request.UserRequest;
    import net.javadog.chat.response.UserResponse;
    import net.javadog.chat.service.UserService;
    import org.springframework.web.bind.annotation.*;
    
    import javax.annotation.Resource;
    
    /**
     * 用户控制器
     *
     * @author: hdx
     * @Date: 2022-12-07 15:48
     * @version: 1.0
     **/
    @Api(tags = "用户控制器")
    @RestController
    @RequestMapping("/user")
    public class UserController {
        
    
        @Resource
        private UserService userService;
    
        @ApiOperation(value = "用户详情", notes = "用户详情")
        @GetMapping
        public UserResponse detail(UserRequest userRequest){
        
            UserResponse userResponse = new UserResponse();
            User user = userService.getById(userRequest.getId());
            BeanUtil.copyProperties(user, userResponse);
            return userResponse;
        }
    
    }

?重要补充  
1.切记修改chat-boot-main下的pom.xml依赖，将chat-boot-controller模块加入  
2.切记修改chat-boot-main下的pom.xml依赖，将chat-boot-dao模块加入  
3.切记修改启动类ChatApplication中加入@MapperScan注解

![在这里插入图片描述][a62aca35dda04b938acb50a0c89647e6.png]

<?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>chat-boot</artifactId>
            <groupId>net.javadog.chat</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>chat-boot-main</artifactId>
    
        <properties>
            <maven.compiler.source>8</maven.compiler.source>
            <maven.compiler.target>8</maven.compiler.target>
        </properties>
    
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>net.javadog.chat</groupId>
                    <artifactId>chat-boot-dependencies</artifactId>
                    <version>1.0-SNAPSHOT</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>
    
        <dependencies>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
            </dependency>
            
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger2</artifactId>
            </dependency>
            
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger-ui</artifactId>
            </dependency>
            
            <dependency>
                <groupId>com.github.xiaoymin</groupId>
                <artifactId>knife4j-spring-boot-starter</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>net.javadog.chat</groupId>
                <artifactId>chat-boot-controller</artifactId>
                <version>${project.parent.version}</version>
            </dependency>
            
            <dependency>
                <groupId>net.javadog.chat</groupId>
                <artifactId>chat-boot-dao</artifactId>
                <version>${project.parent.version}</version>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.1</version>
                    <configuration>
                        <source>${java.version}</source>
                        <target>${java.version}</target>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>2.6</version>
                    <configuration>
                        <delimiters>
                            <delimiter>@</delimiter>
                        </delimiters>
                        <useDefaultDelimiters>false</useDefaultDelimiters>
                    </configuration>
                </plugin>
            </plugins>
            <resources>
                <resource>
                    <directory>src/main/webapp</directory>
                    <filtering>false</filtering>
                </resource>
                <resource>
                    <directory>src/main/resources</directory>
                    <filtering>true</filtering>
                </resource>
                <resource>
                    <directory>src/main/java</directory>
                    <includes>
                        <include>**/*.xml</include>
                    </includes>
                </resource>
            </resources>
        </build>
    
        <profiles>
            <profile>
                <id>local</id>
                <properties>
                    <spring.active>local</spring.active>
                </properties>
                <activation>
                    <activeByDefault>true</activeByDefault>
                </activation>
            </profile>
            <profile>
                <id>dev</id>
                <properties>
                    <spring.active>dev</spring.active>
                </properties>
            </profile>
            <profile>
                <id>prod</id>
                <properties>
                    <spring.active>prod</spring.active>
                </properties>
            </profile>
        </profiles>
    </project>

![在这里插入图片描述][f45ac600429d4165bb982b07d66891d1.png]

package net.javadog.chat;
    
    import com.github.xiaoymin.knife4j.spring.annotations.EnableKnife4j;
    import lombok.extern.slf4j.Slf4j;
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.ServletComponentScan;
    import org.springframework.context.ConfigurableApplicationContext;
    import org.springframework.core.env.Environment;
    import springfox.documentation.swagger2.annotations.EnableSwagger2;
    
    import java.net.InetAddress;
    import java.net.UnknownHostException;
    
    /**
     * @author: hdx
     * @Date: 2023-01-28 11:24
     * @version: 1.0
     **/
    @SpringBootApplication
    @ServletComponentScan
    @Slf4j
    @EnableSwagger2
    @EnableKnife4j
    @MapperScan(basePackages = {
        "net.javadog.chat.mapper"})
    public class ChatApplication {
        
        public static void main(String[] args) throws UnknownHostException {
        
            // 启动类
            ConfigurableApplicationContext application = SpringApplication.run(ChatApplication.class, args);
            // 打印基础信息
            info(application);
        }
    
        static void info(ConfigurableApplicationContext application) throws UnknownHostException {
        
            Environment env = application.getEnvironment();
            String ip = InetAddress.getLocalHost().getHostAddress();
            String port = env.getProperty("server.port");
            String active = env.getProperty("spring.profiles.active");
            String contextPath = env.getProperty("server.servlet.context-path");
            if (contextPath == null) {
        
                contextPath = "";
            }
            log.info("\n----------------------------------------------------------\n\t" +
                    "欢迎访问  \thttps://blog.javadog.net\n\t" +
                    "示例程序【" + active + "】环境已启动! 地址如下:\n\t" +
                    "Local: \t\thttp://localhost:" + port + contextPath + "\n\t" +
                    "External: \thttp://" + ip + ':' + port + contextPath + '\n' +
                    "Swagger文档: \thttp://" + ip + ":" + port + contextPath + "/doc.html\n" +
                    "----------------------------------------------------------");
        }
    }

--------------------

#### ?7.示例DB更新 ####

*  模拟正常**前端请求**到**后台服务调用过程**，进行实际代码补充

![在这里插入图片描述][cd506f90ac5c460fba2aad86ab4ea234.png]

DROP TABLE IF EXISTS `user`;
    CREATE TABLE `user`  (
      `id` bigint(20) NOT NULL COMMENT 'id',
      `username` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '用户名',
      `id_card` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '身份证',
      PRIMARY KEY (`id`) USING BTREE
    ) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
    
    -- ----------------------------
    -- Records of user
    -- ----------------------------
    INSERT INTO `user` VALUES (1, 'JavaDog', '123123');

#### ?8.访问测试 ####

> 浏览器访问http://localhost:8001/chat/v1/user?id=1

**测试成功如下图所示**

![在这里插入图片描述][27662626829b4b97b022934c310fd24e.png]

### 总结 ###

以上示例只是简单示范分层思路，其中代码逻辑实现方式有很多种，大家选取适用自己就好，希望自己的思路能对大家有帮助

如遇缺少依赖情况，**一定要重新拉取依赖！**  
![在这里插入图片描述][4eb79d9a512d4be6b428d1aa5eca5a57.png]

### 写在最后 ###

此生两悔，悔遇见你，更悔未早遇见你，珍惜当下拥有，勿念昔日美好。

<table> 
 <thead> 
  <tr> 
   <th align="center">JavaDog</th> 
   <th align="center">狗屋地址</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td align="center">个人博客</td> 
   <td align="center"><a href="https://blog.javadog.net" rel="nofollow">https://blog.javadog.net</a></td> 
  </tr> 
  <tr> 
   <td align="center">公众号</td> 
   <td align="center"><a href="https://mp.weixin.qq.com/s/_vgnXoQ8FSobD3OfRAf5gw" rel="nofollow">https://mp.weixin.qq.com/s/_vgnXoQ8FSobD3OfRAf5gw</a></td> 
  </tr> 
  <tr> 
   <td align="center">CSDN</td> 
   <td align="center"><a href="https://blog.csdn.net/baidu_25986059" rel="nofollow">https://blog.csdn.net/baidu_25986059</a></td> 
  </tr> 
  <tr> 
   <td align="center">掘金</td> 
   <td align="center"><a href="https://juejin.cn/user/2172290706716775" rel="nofollow">https://juejin.cn/user/2172290706716775</a></td> 
  </tr> 
  <tr> 
   <td align="center">知乎</td> 
   <td align="center"><a href="https://www.zhihu.com/people/JavaDog" rel="nofollow">https://www.zhihu.com/people/JavaDog</a></td> 
  </tr> 
  <tr> 
   <td align="center">简书</td> 
   <td align="center"><a href="https://www.jianshu.com/u/1ff9c6bdb916" rel="nofollow">https://www.jianshu.com/u/1ff9c6bdb916</a></td> 
  </tr> 
  <tr> 
   <td align="center">gitee</td> 
   <td align="center"><a href="https://gitee.com/javadog-net" rel="nofollow">https://gitee.com/javadog-net</a></td> 
  </tr> 
  <tr> 
   <td align="center">GitHub</td> 
   <td align="center"><a href="https://github.com/javadog-net" rel="nofollow">https://github.com/javadog-net</a></td> 
  </tr> 
 </tbody> 
</table>

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