1、背景
首先，谈一谈什么是“SpringBoot业务组件化开发”，最近一直在开发一直面临这一个问题，就是相同的业务场景场景在一个项目中使用了，又需要再另外一个项目中复用，一遍又一遍的复制代码，然后想将该业务的代码在不同的项目中维护起来真的很难。
最开始想用微服务的方式来解决这个问题，但是觉得一套完整的微服务太重，而且目前微服务还处于振荡期（去年的微服务解决方案，今年国内直接都换成了阿里的技术解决方案），此外很多时候我们接私活，就是个单体的SpringBoot项目，用不上微服务这种级别的项目，所以想来想去这条路不是很满足我的需求；再后来，想到单体的聚合架构，但是聚合架构的项目，个人觉得有时候也不是很好，一般的聚合项目就是基于某个具体实例架构下才能使用，换一个架构自己写的业务model就不能用了（比如你在suoyi框架下开发的模块业务包，在guns下可能就直接不能使用了）。
最后，想了一下，能不能单独开发一个项目，这个项目可以自己独立运行（微服务架构下用），也可以在单体项目中直接通过pom引入的方式，然后简单的配置一下，然后直接使用多好；查了一下网上没有现成的技术解决方案，问了同事，他说我这种思想属于SOA的一种实现，同时有第三包和聚合项目的影子在里面。也许有什么更好的技术解决方案，也希望各位能够不吝赐教。
补充一句，之所以说“业务组件化”开发，来源于Vue的思想，希望Java后端开发的业务也可像vue的组件一样去使用，这样多好
2、demo
2-1项目准备
①建一个Java项目项目，结构如下图：
②pom文件如下：
<?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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.1.RELEASE</version>
</parent>
<groupId>top.wp</groupId>
<artifactId>cx-flow</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<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>
<mp.version>3.3.2</mp.version>
<fastjson.version>1.2.70</fastjson.version>
<jwt.version>0.9.1</jwt.version>
<hutool.version>5.3.7</hutool.version>
<lombok.versin>1.18.12</lombok.versin>
<swagger.version>2.9.2</swagger.version>
<swagger.bootstrap.ui.version>1.9.6</swagger.bootstrap.ui.version>
<easypoi.version>4.2.0</easypoi.version>
<jodconverter.version>4.2.0</jodconverter.version>
<libreoffice.version>6.4.3</libreoffice.version>
<justauth.version>1.15.6</justauth.version>
<aliyun.oss.version>3.8.0</aliyun.oss.version>
<qcloud.oss.version>5.6.23</qcloud.oss.version>
<aliyun.sms.sdk.version>4.4.6</aliyun.sms.sdk.version>
<aliyun.sms.esc.version>4.17.6</aliyun.sms.esc.version>
<qcloud.sms.sdk.version>3.1.57</qcloud.sms.sdk.version>
</properties>
<dependencies>
<!-- web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--mybatis-plus-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>${mp.version}</version>
</dependency>
<!--数据库驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql-connector-java.version}</version>
</dependency>
<!--数据库连接池-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>${druid.version}</version>
</dependency>
<!--hutool-->
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>${hutool.version}</version>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.versin}</version>
</dependency>
</dependencies>
<build>
<resources>
<resource>
<directory>src/main/resources</directory>
<!-- <excludes>
<exclude>**/*.properties</exclude>
<exclude>**/*.xml</exclude>
</excludes> -->
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
<include>**/*.yml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
</project>
③配置文件如下：主要是数据库和mybaits-plus的配置（其实可以不用这个配置文件，在这只是为了项目能够独立运行起来）
#服务配置
server:
port: 8080
#spring相关配置
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/cx-xn?autoReconnect=true&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=CONVERT_TO_NULL&useSSL=false&serverTimezone=CTT&nullCatalogMeansCurrent=true
username: 数据库账户
password: 数据库密码
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
#mybaits相关配置
mybatis-plus:
mapper-locations: classpath*:top/wp/cx/**/mapping/*.xml, classpath:/META-INF/modeler-mybatis-mappings/*.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.stdout.StdOutImpl
global-config:
banner: false
db-config:
id-type: assign_id
table-underline: true
enable-sql-runner: true
configuration-properties:
prefix:
blobType: BLOB
boolValue: TRUE
④启动入口（可以不用写，启动入口存在目的是让项目可以自己跑起来）
package top.wp.cx;
import cn.hutool.log.StaticLog;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class CXApplication {
public static void main(String[] args) {
SpringApplication.run(CXApplication.class, args);
StaticLog.info(">>> " + CXApplication.class.getSimpleName() + " 启动成功!");
}
}
⑤测试：entity、result
package top.wp.cx.modular.test.entity;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
@Data
@TableName("test")
public class Test {
/**
* 主键
*/
@TableId(type = IdType.ASSIGN_ID)
private Integer id;
/**
* 账号
*/
private String name;
}
package top.wp.cx.modular.test.result;
import lombok.Data;
@Data
public class TestResult {
private Integer id;
private String name;
}
⑥测试mapper、xml、service和controller
package top.wp.cx.modular.test.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import top.wp.cx.modular.test.entity.Test;
/**
* 系统用户数据范围mapper接口
*
* @author xuyuxiang
* @date 2020/3/13 15:46
*/
//@Mapper
public interface TestMapper extends BaseMapper<Test> {
}
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="top.wp.cx.modular.test.mapper.TestMapper">
</mapper>
package top.wp.cx.modular.test.service;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;
import top.wp.cx.modular.test.entity.Test;
import top.wp.cx.modular.test.mapper.TestMapper;
/**
* 一个service实现
*
* @author yubaoshan
* @date 2020/4/9 18:11
*/
@Service
public class TestService extends ServiceImpl<TestMapper, Test> {
}
package top.wp.cx.modular.test.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import top.wp.cx.modular.test.entity.Test;
import top.wp.cx.modular.test.service.TestService;
import javax.annotation.Resource;
import java.util.List;
/**
* 一个示例接口
*
* @author yubaoshan
* @date 2020/4/9 18:09
*/
@RestController
@RequestMapping("/test")
public class TestController {
@Resource
private TestService testService;
@GetMapping("")
public List<Test> testResult(){
return testService.list();
}
@GetMapping("/2")
public String testResult2(){
return "22";
}
}
至此项目准备完成，其实就是简单见了一个测试项目，此时如果你按照上面的步骤，写了启动类和配置项信息，项目是可以独立运行的。
2-2项目打包、引入、运行
①将2-1中的测试项目进行打包：install右键第一个选项
②此时你的本地maven仓库会出现刚才的项目（当然前提是你的idea配置过本地的maven）
③新建另外一个项目cx-main
④pom文件如下：注意将你刚才的准备测试的项目引入进来
<?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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.1.RELEASE</version>
</parent>
<groupId>top.wp.cx</groupId>
<artifactId>cx-main</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<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>
<mp.version>3.3.2</mp.version>
<fastjson.version>1.2.70</fastjson.version>
<jwt.version>0.9.1</jwt.version>
<hutool.version>5.3.7</hutool.version>
<lombok.versin>1.18.12</lombok.versin>
<swagger.version>2.9.2</swagger.version>
<swagger.bootstrap.ui.version>1.9.6</swagger.bootstrap.ui.version>
<easypoi.version>4.2.0</easypoi.version>
<jodconverter.version>4.2.0</jodconverter.version>
<libreoffice.version>6.4.3</libreoffice.version>
<justauth.version>1.15.6</justauth.version>
<aliyun.oss.version>3.8.0</aliyun.oss.version>
<qcloud.oss.version>5.6.23</qcloud.oss.version>
<aliyun.sms.sdk.version>4.4.6</aliyun.sms.sdk.version>
<aliyun.sms.esc.version>4.17.6</aliyun.sms.esc.version>
<qcloud.sms.sdk.version>3.1.57</qcloud.sms.sdk.version>
</properties>
<dependencies>
<dependency>
<groupId>top.wp</groupId>
<artifactId>cx-flow</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<!-- web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--mybatis-plus-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>${mp.version}</version>
</dependency>
<!--数据库驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql-connector-java.version}</version>
</dependency>
<!--数据库连接池-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>${druid.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>
</dependencies>
<!--xml打包排除-->
<build>
<resources>
<resource>
<directory>src/main/resources</directory>
<!-- <excludes>
<exclude>**/*.properties</exclude>
<exclude>**/*.xml</exclude>
</excludes> -->
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
<include>**/*.yml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
</project>
⑤application.yml配置文件 注意xml的扫描
#服务配置
server:
port: 8081
#spring相关配置
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/cx-xn?autoReconnect=true&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=CONVERT_TO_NULL&useSSL=false&serverTimezone=CTT&nullCatalogMeansCurrent=true
username: root
password: root
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
#mybaits相关配置
mybatis-plus:
#xml文件扫描
mapper-locations: classpath*:top/wp/cx/**/mapping/*.xml, classpath:/META-INF/modeler-mybatis-mappings/*.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.stdout.StdOutImpl
global-config:
banner: false
db-config:
id-type: assign_id
table-underline: true
enable-sql-runner: true
configuration-properties:
prefix:
blobType: BLOB
boolValue: TRUE
⑥启动入口，注意spring和mapper扫描
package top.wp.cx.main;
import cn.hutool.log.StaticLog;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@SpringBootApplication
@ComponentScan(basePackages = {"top.wp.cx.modular.test"}) // spring扫描
@MapperScan(basePackages = {"top.wp.cx.modular.test.**.mapper"}) // mybatis扫描mapper
public class CXApplication {
public static void main(String[] args) {
SpringApplication.run(CXApplication.class, args);
StaticLog.info(">>> " + CXApplication.class.getSimpleName() + " 启动成功!");
}
}
⑦此时启动cx-main的项目，访问2-1的测试controller能访问成功证明配置正确
来源：blog.csdn.net/weixin_44213308/
article/details/111151350
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原文始发于微信公众号（Java知音）：谈谈 SpringBoot 业务组件化开发思路
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