javadog-net

前言

??緣由

經?？吹骄W上很多優秀的開源項目中，代碼簡潔，模塊分層完美。反觀自己代碼層級混亂，，卻不知如何整理分層。此文手把手教你一步一步創建模塊，左手右手一個慢動作。結合本人實際開發及個人項目中分層思路的分享，大神請勿噴。

??本文閱讀時長

約25分鐘

??主要目標

1. 熟練掌握SpringBoot項目分層思路，絲滑拆分模塊
2. 熟悉代碼層級依賴，規范化管理模塊分布
3. 手把手實戰學習，理論實踐相結合

?????試用人群

1. 對于Springboot熟悉但是不知道合理分層小白
2. 有自己分層思路可以互相分享學習

??快速鏈接

公眾號：JavaDog程序狗
在公眾號，發送【分層】 ，無任何套路即可獲得

或訪問https://blog.javadog.net/archives/boot-module

??水圖

下圖反面教材，傳統單體應用，結構臃腫

下圖分層截選自本人的一個小項目，模塊清晰，分工明確

我們要實現的小栗子的分層

正文

??1.IDEA新建項目

起名第一步，一個好名字,說不定是個好的開始

假如我們的項目是個聊天相關的項目，英文對應chat,所以定義項目名為chat-boot，其他的以此效仿

點擊New->project

選擇Maven項目，并選擇合適JDK版本,點擊Next

錄入項目名稱，并填寫GAV坐標，點擊Finish

刪除無用文件及目錄，如src目錄和*.iml文件

刪除后項目目錄

修改pom.xml中依賴，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>

---

??2.創建子模塊-dependencies(依賴層)

右擊項目chat-boot，new ->Moudle新建模塊chat-boot-dependencies

選擇對應Module SDK版本，本人選擇jdk1.8

填寫子模塊名 chat-boot-dependencies，然后檢查對應GAV，點擊Finish

生成子模塊chat-boot-dependencies如下圖

刪除chat-boot-dependencies下無用文件及目錄，如src目錄，刪除無用目錄如下

完善chat-boot-dependencies下pom.xml依賴， 常用依賴放入，作為依賴主體，以下是本狗常用依賴，可酌情選擇；記得把packaging改為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>
            <!--mybatis-plus-->
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-boot-starter</artifactId>
                <version>${mybatis-plus.version}</version>
            </dependency>

            <!-- 數據庫驅動,可根據自己需要自行刪減，默認使用mysql -->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql-connector-java.version}</version>
            </dependency>

            <!--數據庫連接池-->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>${druid.version}</version>
            </dependency>

            <!--fastjson-->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>${fastjson.version}</version>
            </dependency>

            <!--hutool-->
            <dependency>
                <groupId>cn.hutool</groupId>
                <artifactId>hutool-all</artifactId>
                <version>${hutool.version}</version>
            </dependency>

            <!--lombok-->
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.versin}</version>
            </dependency>

            <!--swagger2-->
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger2</artifactId>
                <version>${springfox-swagger2.version}</version>
            </dependency>

            <!--swagger-ui-->
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger-ui</artifactId>
                <version>${springfox-swagger-ui.version}</version>
            </dependency>

            <!-- swagger接口文檔 -->
            <dependency>
                <groupId>com.github.xiaoymin</groupId>
                <artifactId>knife4j-spring-boot-starter</artifactId>
                <version>${knife4j.version}</version>
            </dependency>

            <!--easypoi導入導出-->
            <dependency>
                <groupId>cn.afterturn</groupId>
                <artifactId>easypoi-base</artifactId>
                <version>${easypoi.version}</version>
            </dependency>

            <!--WxJava - 微信開發 Java SDK-->
            <dependency>
                <groupId>com.github.binarywang</groupId>
                <artifactId>weixin-java-miniapp</artifactId>
                <version>${weixin.version}</version>
            </dependency>

            <!--整合Shiro安全框架-->
            <dependency>
                <groupId>org.apache.shiro</groupId>
                <artifactId>shiro-spring</artifactId>
                <version>${shiro.version}</version>
            </dependency>

            <!--集成jwt實現token認證-->
            <dependency>
                <groupId>com.auth0</groupId>
                <artifactId>java-jwt</artifactId>
                <version>${jwt.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

??重點

此處用的標簽是 dependencyManagement，

dependencyManagement只是聲明依賴，并不實現引入，因此子項目需要顯示的聲明需要用的依賴。如果不在子項目中聲明依賴，是不會從父項目中繼承下來；只有在子項目中寫了該依賴項，并且沒有指定具體版本，才會從父項目中繼承該項，并且version和scope都讀取自父pom;另外如果子項目中指定了版本號，那么會使用子項目中指定的jar版本。

---

??3.創建子模塊-main(主啟動層)

右擊項目chat-boot，new ->Moudle新建模塊chat-boot-main

選擇對應Module SDK版本，本狗選擇jdk1.8，點擊Next

填寫子模塊名 chat-boot-main，然后檢查對應GAV，點擊Finish

生成子模塊chat-boot-main如下圖

完善chat-boot-main模塊下pom.xml中依賴

1. 引入必要依賴
2. 完善profiles標簽中環境相關
3. 配置build標簽中插件

<?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>
        <!-- web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <!--swagger2-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
        </dependency>
        <!--swagger-ui-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
        </dependency>
        <!-- swagger接口文檔 -->
        <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>

??重點

• 配置引入依賴chat-boot-dependencies,用作此模塊依賴引入

<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標簽用于完善插件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環境變量標簽，用于方便打包切換，本狗設置了 local、dev、prod三種環境

 <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右上角方便切換環境

??切記一定主動Reload一下Maven依賴
??切記一定主動Reload一下Maven依賴
??切記一定主動Reload一下Maven依賴

在chat-boot-main模塊中加入啟動類，在src/main/java下右鍵New=>Java Class

錄入啟動類名ChatApplication

完善ChatApplication啟動類代碼

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 {
        // 啟動類
        ConfigurableApplicationContext application = SpringApplication.run(ChatApplication.class, args);
        // 打印基礎信息
        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" +
                "歡迎訪問  \thttps://blog.javadog.net\n\t" +
                "示例程序【" + active + "】環境已啟動! 地址如下:\n\t" +
                "Local: \t\thttp://localhost:" + port + contextPath + "\n\t" +
                "External: \thttp://" + ip + ':' + port + contextPath + '\n' +
                "Swagger文檔: \thttp://" + ip + ":" + port + contextPath + "/doc.html\n" +
                "----------------------------------------------------------");
    }
}

配置application.yml文件

application.yml

#============================#
# server 配置
#============================#
server:
  port: 82
  max-http-header-size: 10240
  servlet:
    context-path: /chat/v1

#============================#
# spring 配置
#============================#
spring:
  application:
    # 應用名
    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:
      # 格式化輸出
      indent_output: false
  main:
    allow-circular-references: true
    #解決swagger版本路徑不兼容問題
  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
      #數據庫類型
    db-type: MYSQL
  configuration-properties:
    prefix:
    #如果數據庫為postgresql，則需要配置為blobType: BINARY
    blobType: BLOB
    #如果數據庫為oracle或mssql，則需要配置為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:
  # 靜態附件前綴
  static-prefix: attach
  # 上傳的文件對外暴露的訪問路徑
  access-path-pattern: /${file.static-prefix}/**
  # 文件上傳目錄
  upload-folder: /root/javadog/chat/
  # 文件上傳最大
  max-post-size: 10

application-local.yml

#服務配置
server:
  port: 8001
  max-http-header-size: 10240

# Mysql數據庫
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

#服務配置
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

#服務配置
server:
  port: 8005

??順便加一下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">
        <!--輸出到控制臺-->
        <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">
        <!--輸出到文件-->
        <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>${logging.file.max-size}</maxFileSize>
                </timeBasedFileNamingAndTriggeringPolicy>
                <!--只保留最近n天的日志-->
                <maxHistory>${logging.file.max-history}</maxHistory>
            </rollingPolicy>
            <!-- 追加方式記錄日志 -->
            <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>${logging.file.max-size}</maxFileSize>
                </timeBasedFileNamingAndTriggeringPolicy>
                <!--只保留最近n天的日志-->
                <maxHistory>${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>
                <!--只保留最近n天的日志-->
                <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>

啟動一下項目試試，啟動如下證明成功。如果報錯少依賴請再拉一下Maven依賴?。?！

---

??4.創建子模塊-module(模塊層)

右擊項目chat-boot，new ->Moudle新建模塊chat-boot-module

填寫子模塊名 chat-boot-module，然后檢查對應GAV，點擊Finish

生成子模塊chat-boot-module如下圖

刪除chat-boot-module下無用文件及目錄，如src目錄，刪除無用目錄如下

自此外部大框架初步搭建成功

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

<?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 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-module</artifactId>
    <packaging>pom</packaging>
    <modules>
        <module>chat-boot-common</module>
        <module>chat-boot-controller</module>
        <module>chat-boot-dao</module>
        <module>chat-boot-dto</module>
        <module>chat-boot-entity</module>
        <module>chat-boot-service</module>
    </modules>

    <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>${project.parent.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <!-- web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--WxJava - 微信開發 Java SDK-->
        <dependency>
            <groupId>com.github.binarywang</groupId>
            <artifactId>weixin-java-miniapp</artifactId>
        </dependency>
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <!--hutool-->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
        </dependency>
        <!--swagger2-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
        </dependency>
        <!--swagger-ui-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
        </dependency>
        <!--整合Knife4j-->
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>knife4j-spring-boot-starter</artifactId>
        </dependency>
        <!--整合Shiro安全框架-->
        <dependency>
            <groupId>org.apache.shiro</groupId>
            <artifactId>shiro-spring</artifactId>
        </dependency>
        <!--jwt-->
        <dependency>
            <groupId>com.auth0</groupId>
            <artifactId>java-jwt</artifactId>
        </dependency>
        <!--mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
    </dependencies>

</project>

一定要重新拉取依賴！
一定要重新拉取依賴！
一定要重新拉取依賴！

---

??5.創建chat-boot-module模塊下對應功能分層

目前本狗分為如下6層

• common-共通層
• controller-控制器層
• dao-數據持久層
• dto-數據傳輸對象層
• entity-實體層
• service-業務邏輯層

依次按照上述添加模塊方式進行新增子模塊，本狗如下示例一個，其余都如法炮制

右擊項目chat-boot-module，new ->Moudle新建模塊chat-boot-common

一定看清楚父模塊是否正確
一定看清楚父模塊是否正確
一定看清楚父模塊是否正確

確認父級模塊后，點擊Finish，生成chat-boot-common模塊

依次按照上述方法，新建其他模塊

chat-boot-controller模塊

chat-boot-dao模塊

chat-boot-dto模塊

chat-boot-entity模塊

chat-boot-service模塊

總體模塊雛形基本完成

??6.實際流程填充

• 模擬正常前端請求到后臺服務調用過程，進行實際代碼補充

在chat-boot-entity下新建實體類User，在src/main/java下右鍵New=>Java Class，錄入包名及類名

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，分別代表請求傳輸對象和返回傳輸對象，并分別在目錄下創建UserRequest.java和UserResponse.java

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模塊下修改pom.xml文件依賴，引入chat-boot-entity;并增對應UserMapper.java

package net.javadog.chat.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import net.javadog.chat.entity.User;

/**
 * 用戶mapper
 *
 * @author: hdx
 * @Date: 2023-01-10 11:43
 * @version: 1.0
 **/
public interface UserMapper extends BaseMapper<User> {
}

<?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-module</artifactId>
        <groupId>net.javadog.chat</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>chat-boot-dao</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>net.javadog.chat</groupId>
            <artifactId>chat-boot-entity</artifactId>
            <version>${project.parent.version}</version>
        </dependency>
    </dependencies>

</project>

---

在chat-boot-service下新建目錄service和impl，并在對應目錄下新建UserService.java和UserServiceImpl.java，并修改chat-boot-service模塊下修改pom.xml文件依賴，引入chat-boot-dto,chat-boot-dao

package net.javadog.chat.service;

import com.baomidou.mybatisplus.extension.service.IService;
import net.javadog.chat.entity.User;

/**
 * 用戶接口
 *
 * @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;

/**
 * 用戶接口實現類
 *
 * @author: hdx
 * @Date: 2023-01-10 11:55
 * @version: 1.0
 **/
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {

}

<?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-module</artifactId>
        <groupId>net.javadog.chat</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>chat-boot-service</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>net.javadog.chat</groupId>
            <artifactId>chat-boot-dao</artifactId>
            <version>${project.parent.version}</version>
        </dependency>
        <dependency>
            <groupId>net.javadog.chat</groupId>
            <artifactId>chat-boot-dto</artifactId>
            <version>${project.parent.version}</version>
        </dependency>
    </dependencies>

</project>

---

在chat-boot-controller創建UserController.java,并修改chat-boot-controller模塊下修改pom.xml文件依賴，引入chat-boot-dto,chat-boot-service

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;

/**
 * 用戶控制器
 *
 * @author: hdx
 * @Date: 2022-12-07 15:48
 * @version: 1.0
 **/
@Api(tags = "用戶控制器")
@RestController
@RequestMapping("/user")
public class UserController {

    @Resource
    private UserService userService;

    @ApiOperation(value = "用戶詳情", notes = "用戶詳情")
    @GetMapping
    public UserResponse detail(UserRequest userRequest){
        UserResponse userResponse = new UserResponse();
        User user = userService.getById(userRequest.getId());
        BeanUtil.copyProperties(user, userResponse);
        return userResponse;
    }

}

??重要補充
1.切記修改chat-boot-main下的pom.xml依賴，將chat-boot-controller模塊加入
2.切記修改chat-boot-main下的pom.xml依賴，將chat-boot-dao模塊加入
3.切記修改啟動類ChatApplication中加入@MapperScan注解

<?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>
        <!-- web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <!--swagger2-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
        </dependency>
        <!--swagger-ui-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
        </dependency>
        <!-- swagger接口文檔 -->
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>knife4j-spring-boot-starter</artifactId>
        </dependency>

        <!-- controller -->
        <dependency>
            <groupId>net.javadog.chat</groupId>
            <artifactId>chat-boot-controller</artifactId>
            <version>${project.parent.version}</version>
        </dependency>
        <!-- dao -->
        <dependency>
            <groupId>net.javadog.chat</groupId>
            <artifactId>chat-boot-dao</artifactId>
            <version>${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>

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 {
        // 啟動類
        ConfigurableApplicationContext application = SpringApplication.run(ChatApplication.class, args);
        // 打印基礎信息
        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" +
                "歡迎訪問  \thttps://blog.javadog.net\n\t" +
                "示例程序【" + active + "】環境已啟動! 地址如下:\n\t" +
                "Local: \t\thttp://localhost:" + port + contextPath + "\n\t" +
                "External: \thttp://" + ip + ':' + port + contextPath + '\n' +
                "Swagger文檔: \thttp://" + ip + ":" + port + contextPath + "/doc.html\n" +
                "----------------------------------------------------------");
    }
}

---

??7.示例DB更新

• 模擬正常前端請求到后臺服務調用過程，進行實際代碼補充

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 '用戶名',
  `id_card` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '身份證',
  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.訪問測試

瀏覽器訪問http://localhost:8001/chat/v1/user?id=1

測試成功如下圖所示

總結

以上示例只是簡單示范分層思路，其中代碼邏輯實現方式有很多種，大家選取適用自己就好，希望自己的思路能對大家有幫助

如遇缺少依賴情況，一定要重新拉取依賴！

寫在最后

此生兩悔，悔遇見你，更悔未早遇見你，珍惜當下擁有，勿念昔日美好。

JavaDog	狗屋地址
個人博客	https://blog.javadog.net
公眾號	https://mp.weixin.qq.com/s/_vgnXoQ8FSobD3OfRAf5gw
CSDN	https://blog.csdn.net/baidu_25986059
掘金	https://juejin.cn/user/2172290706716775
知乎	https://www.zhihu.com/people/JavaDog
簡書	https://www.jianshu.com/u/1ff9c6bdb916
gitee	https://gitee.com/javadog-net
GitHub	https://github.com/javadog-net