前言:
以前我们在建项目的时候, 要么将所有的package建在一个项目里面, 在处理引用的时候, 真的很方便. 不用担心, 有些东西配置不到或者读取不到.
或者, 将package独立出去, 到一个项目中或者子项目中. 这时候, 项目中的引用处理, 还是有些麻烦的. 不过好处更多, 不再表述.
在 idea 里面, 推荐使用 多模块 建项目, 而不再是 eclipse 里面的那种方式. 那这里, 就试着将一个springboot 的项目拆分到子模块中去, 看看效果如何.
项目拆分:
1. 目录变化
2. 父项目
父pom.xml理论上来说, 应该是对子项目中的引用进行一个约束, 主要是版本约束.
所以父 pom.xm 中, 应该使用dependencymanagement 来约束 子项目中 jar 包版本.
然后对于一些子项目都用得着的引用, 可以提到 父项目中去.
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<?xml version="1.0" encoding="utf-8"?>
<project xmlns="http://maven.apache.org/pom/4.0.0" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
xsi:schemalocation="http://maven.apache.org/pom/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelversion>4.0.0</modelversion>
<groupid>cn.elvinle</groupid>
<artifactid>parent</artifactid>
<version>0.0.1-snapshot</version>
<packaging>pom</packaging>
<name>parent</name>
<description>demo project for spring boot</description>
<parent>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter-parent</artifactid>
<version>1.5.9.release</version>
<relativepath/> <!-- lookup parent from repository -->
</parent>
<modules>
<module>pojo</module>
<module>web</module>
<module>dao</module>
<module>service</module>
<module>simpl</module>
</modules>
<properties>
<project.build.sourceencoding>utf-8</project.build.sourceencoding>
<project.reporting.outputencoding>utf-8</project.reporting.outputencoding>
<java.version>1.8</java.version>
<druid.version>1.1.3</druid.version>
<mybatis.boot.starter.version>1.3.1</mybatis.boot.starter.version>
<mysql.connector.java.version>5.1.44</mysql.connector.java.version>
</properties>
<dependencymanagement>
<dependencies>
<dependency>
<groupid>com.alibaba</groupid>
<artifactid>druid</artifactid>
<version>${druid.version}</version>
</dependency>
<dependency>
<groupid>org.mybatis.spring.boot</groupid>
<artifactid>mybatis-spring-boot-starter</artifactid>
<version>${mybatis.boot.starter.version}</version>
</dependency>
<dependency>
<groupid>mysql</groupid>
<artifactid>mysql-connector-java</artifactid>
<version>${mysql.connector.java.version}</version>
</dependency>
</dependencies>
</dependencymanagement>
<!--申明依赖关系-->
<dependencies>
<dependency>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter-web</artifactid>
</dependency>
<dependency>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter-test</artifactid>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-maven-plugin</artifactid>
</plugin>
</plugins>
</build>
</project>
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3. 子项目 – pojo
3.1 pom.xml
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<?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>cn.elvinle</groupid>
<artifactid>parent</artifactid>
<version>0.0.1-snapshot</version>
</parent>
<groupid>cn.elvinle</groupid>
<artifactid>pojo</artifactid>
<version>0.0.1-snapshot</version>
<packaging>jar</packaging>
<name>pojo</name>
<description>demo project for spring boot</description>
<properties>
<project.build.sourceencoding>utf-8</project.build.sourceencoding>
<project.reporting.outputencoding>utf-8</project.reporting.outputencoding>
<java.version>1.8</java.version>
</properties>
<build>
<plugins>
<plugin>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-maven-plugin</artifactid>
</plugin>
</plugins>
</build>
</project>
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3.2 db实体
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package cn.elvinle.pojo;
/**
* @author: elvin
*/
public class user {
private int id;
private string name;
public int getid() {
return id;
}
public void setid(int id) {
this.id = id;
}
public string getname() {
return name;
}
public void setname(string name) {
this.name = name;
}
}
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对于pojo和dao中的内容, 可以使用mybatis逆向工程生成, 可以省去很多麻烦.
4. 子项目 – dao
4.1 pom.xml
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<?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>cn.elvinle</groupid>
<artifactid>parent</artifactid>
<version>0.0.1-snapshot</version>
</parent>
<groupid>cn.elvinle</groupid>
<artifactid>dao</artifactid>
<version>0.0.1-snapshot</version>
<packaging>jar</packaging>
<name>dao</name>
<description>demo project for spring boot</description>
<properties>
<project.build.sourceencoding>utf-8</project.build.sourceencoding>
<project.reporting.outputencoding>utf-8</project.reporting.outputencoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!-- 内部引用 -->
<dependency>
<groupid>cn.elvinle</groupid>
<artifactid>pojo</artifactid>
<version>0.0.1-snapshot</version>
</dependency>
<!-- 外部引用 -->
<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
<groupid>com.alibaba</groupid>
<artifactid>druid</artifactid>
</dependency>
<dependency>
<groupid>mysql</groupid>
<artifactid>mysql-connector-java</artifactid>
</dependency>
<dependency>
<groupid>org.mybatis.spring.boot</groupid>
<artifactid>mybatis-spring-boot-starter</artifactid>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-maven-plugin</artifactid>
</plugin>
</plugins>
</build>
</project>
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4.2 mapper
usermapper.java:
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public interface usermapper {
public list<user> getall();
}
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usermapper.xml:
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<?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="cn.elvinle.dao.mapper.usermapper" >
<select id="getall" resulttype="cn.elvinle.pojo.user">
select * from user
</select>
</mapper>
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5. 子项目 – service
5.1 pom.xml
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<?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>cn.elvinle</groupid>
<artifactid>parent</artifactid>
<version>0.0.1-snapshot</version>
</parent>
<groupid>cn.elvinle</groupid>
<artifactid>service</artifactid>
<version>0.0.1-snapshot</version>
<packaging>jar</packaging>
<name>service</name>
<description>demo project for spring boot</description>
<properties>
<project.build.sourceencoding>utf-8</project.build.sourceencoding>
<project.reporting.outputencoding>utf-8</project.reporting.outputencoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupid>cn.elvinle</groupid>
<artifactid>pojo</artifactid>
<version>0.0.1-snapshot</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-maven-plugin</artifactid>
</plugin>
</plugins>
</build>
</project>
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5.2 userservice.java
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public interface userservice {
public list<user> getall();
}
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6. 子项目 – simpl
6.1 pom.xml
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<?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>cn.elvinle</groupid>
<artifactid>parent</artifactid>
<version>0.0.1-snapshot</version>
</parent>
<groupid>cn.elvinle</groupid>
<artifactid>simpl</artifactid>
<version>0.0.1-snapshot</version>
<packaging>jar</packaging>
<name>simpl</name>
<description>demo project for spring boot</description>
<properties>
<project.build.sourceencoding>utf-8</project.build.sourceencoding>
<project.reporting.outputencoding>utf-8</project.reporting.outputencoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupid>cn.elvinle</groupid>
<artifactid>pojo</artifactid>
<version>0.0.1-snapshot</version>
</dependency>
<dependency>
<groupid>cn.elvinle</groupid>
<artifactid>service</artifactid>
<version>0.0.1-snapshot</version>
</dependency>
<dependency>
<groupid>cn.elvinle</groupid>
<artifactid>dao</artifactid>
<version>0.0.1-snapshot</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-maven-plugin</artifactid>
</plugin>
</plugins>
</build>
</project>
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6.2 usersimpl
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@service
public class usersimpl implements userservice {
@autowired
private usermapper usermapper;
@override
public list<user> getall() {
system.out.println("usersimpl getall");
return usermapper.getall();
}
}
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7. 子项目 – web
关键的地方来了.
7.1 pom.xml
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<?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>cn.elvinle</groupid>
<artifactid>parent</artifactid>
<version>0.0.1-snapshot</version>
</parent>
<groupid>cn.elvinle</groupid>
<artifactid>web</artifactid>
<version>0.0.1-snapshot</version>
<packaging>jar</packaging>
<name>web</name>
<description>demo project for spring boot</description>
<properties>
<project.build.sourceencoding>utf-8</project.build.sourceencoding>
<project.reporting.outputencoding>utf-8</project.reporting.outputencoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupid>cn.elvinle</groupid>
<artifactid>simpl</artifactid>
<version>0.0.1-snapshot</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-maven-plugin</artifactid>
</plugin>
</plugins>
</build>
</project>
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7.2 application.yml
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server:
context-path: /parent
port: 8080
mybatis:
config-location: /mapper/*.xml
spring:
datasource:
username: root
password: root
url: jdbc:mysql://localhost:3306/shop?useunicode=true&characterencoding=utf-8
driver-class-name: com.mysql.jdbc.driver
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7.3 控制器
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@restcontroller
@requestmapping("api")
public class apicontroller {
@autowired
private userservice userservice;
@requestmapping("index")
public list<user> index(){
list<user> all = userservice.getall();
return all;
}
}
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到目前为止, 没什么特别的, 都是正常修改, 接下来, 会出现与不分模块不同的地方.
7.4 入口处修改
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@componentscan({"cn.elvinle"})
@springbootapplication
public class webapplication {
public static void main(string[] args) {
springapplication.run(webapplication.class, args);
}
}
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这时候, 如果直接运行起程序, 是不会成功访问的. 原因在于, mybatis的自动化配置和自动化创建, 没有支持到多模块中.
这时候, 需要我们手动进行配置和创建.
7.5 mybatis java 配置
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<!-- mybatis 的工厂 -->
<bean id="sqlsessionfactory" class="org.mybatis.spring.sqlsessionfactorybean">
<property name="datasource" ref="datasource" />
<property name="configlocation" value="classpath:mybatis/sqlmapconfig.xml"/>
<!-- 自动扫描mapping.xml文件 -->
<!--<property name="mapperlocations" value="classpath:mapper/*.xml" />-->
</bean>
<!-- dao接口所在包名，spring会自动查找其下的类 -->
<bean id="mapperscannerconfigurer" class="org.mybatis.spring.mapper.mapperscannerconfigurer">
<property name="basepackage" value="cn.elvinle.bookshop.mapper" />
<property name="sqlsessionfactorybeanname" value="sqlsessionfactory"/>
</bean>
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可以对照着上面的配置文件, 进行java配置
mybatisconfig:
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@configuration
public class mybatisconfig {
@value("${mybatis.config-location}")
private string mapperlocationpattern;
@bean
@configurationproperties(prefix = "spring.datasource")
public datasource datasource(){return new com.alibaba.druid.pool.druiddatasource();
}
@bean(name="sqlsessionfactory")
public sqlsessionfactory sqlsessionfactory() throws exception{
sqlsessionfactorybean sqlsessionfactorybean = new sqlsessionfactorybean();
sqlsessionfactorybean.setdatasource(datasource());
pathmatchingresourcepatternresolver resolver = new pathmatchingresourcepatternresolver();
sqlsessionfactorybean.setmapperlocations(resolver.getresources(mapperlocationpattern));
return sqlsessionfactorybean.getobject();
}
}
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mybatismapperscannerconfig:
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@configuration
@autoconfigureafter(mybatisconfig.class)
@mapperscan("cn.elvinle.dao.mapper")
public class mybatismapperscannerconfig {
public mapperscannerconfigurer mapperscannerconfigurer(){
mapperscannerconfigurer mapperscannerconfigurer = new mapperscannerconfigurer();
mapperscannerconfigurer.setsqlsessionfactorybeanname("sqlsessionfactory");
mapperscannerconfigurer.setbasepackage("cn.elvinle.dao.mapper");
return mapperscannerconfigurer;
}
}
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ok, 到这里, 就可以把程序跑起来了, 看一下结果:
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持快网idc。
原文链接：https://www.cnblogs.com/elvinle/p/8177825.html
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