springboot多模块如何将mybatis项目拆分出去
小编给大家分享一下springboot多模块如何将mybatis项目拆分出去，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
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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.
<?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>3. 子项目 - pojo
3.1 pom.xml
<?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>
3.2 db实体
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;
}
}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
<?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>
4.2 mapper
UserMapper.java:
public interface UserMapper {
public List<User> getAll();
}UserMapper.xml:
<?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>
5. 子项目 - service
5.1 pom.xml
<?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>
5.2 UserService.java
public interface UserService {
public List<User> getAll();
}6. 子项目 - simpl
6.1 pom.xml
<?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>
6.2 UserSImpl
@Service
public class UserSImpl implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public List<User> getAll() {
System.out.println("UserSImpl getAll");
return userMapper.getAll();
}
}7. 子项目 - web
关键的地方来了.
7.1 pom.xml
<?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>
7.2 application.yml
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
7.3 控制器
@RestController
@RequestMapping("api")
public class ApiController {
@Autowired
private UserService userService;
@RequestMapping("index")
public List<User> index(){
List<User> all = userService.getAll();
return all;
}
}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
@ComponentScan({"cn.elvinle"})
@SpringBootApplication
public class WebApplication {
public static void main(String[] args) {
SpringApplication.run(WebApplication.class, args);
}
}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
<!-- 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>
可以对照着上面的配置文件, 进行java配置
MybatisConfig:
@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();
}
}MybatisMapperScannerConfig:
@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;
}
}OK, 到这里, 就可以把程序跑起来了, 看一下结果:
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