springboot 多模塊將dao(mybatis)項(xiàng)目拆分出去
更新時(shí)間：2018年05月04日 11:51:10 作者：Sniper_ZL
這篇文章主要介紹了springboot 多模塊將dao(mybatis)項(xiàng)目拆分出去，小編覺得挺不錯(cuò)的，現(xiàn)在分享給大家，也給大家做個(gè)參考。一起跟隨小編過來看看吧
前言:
以前我們在建項(xiàng)目的時(shí)候, 要么將所有的package建在一個(gè)項(xiàng)目里面, 在處理引用的時(shí)候, 真的很方便. 不用擔(dān)心, 有些東西配置不到或者讀取不到.
或者, 將package獨(dú)立出去, 到一個(gè)項(xiàng)目中或者子項(xiàng)目中. 這時(shí)候, 項(xiàng)目中的引用處理, 還是有些麻煩的. 不過好處更多, 不再表述.
在 idea 里面, 推薦使用 多模塊 建項(xiàng)目, 而不再是 eclipse 里面的那種方式. 那這里, 就試著將一個(gè)springboot 的項(xiàng)目拆分到子模塊中去, 看看效果如何.
項(xiàng)目拆分:
1. 目錄變化
2. 父項(xiàng)目
父pom.xml理論上來說, 應(yīng)該是對子項(xiàng)目中的引用進(jìn)行一個(gè)約束, 主要是版本約束.
所以父 pom.xm 中, 應(yīng)該使用dependencyManagement 來約束 子項(xiàng)目中 jar 包版本.
然后對于一些子項(xiàng)目都用得著的引用, 可以提到 父項(xiàng)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>
<!--申明依賴關(guān)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. 子項(xiàng)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實(shí)體
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;
}
}
對于pojo和dao中的內(nèi)容, 可以使用mybatis逆向工程生成, 可以省去很多麻煩.
4. 子項(xiàng)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>
<!-- 內(nèi)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. 子項(xiàng)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. 子項(xiàng)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. 子項(xiàng)目 - web
關(guān)鍵的地方來了.
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;
}
}
到目前為止, 沒什么特別的, 都是正常修改, 接下來, 會出現(xiàn)與不分模塊不同的地方.
7.4 入口處修改
@ComponentScan({"cn.elvinle"})
@SpringBootApplication
public class WebApplication {
public static void main(String[] args) {
SpringApplication.run(WebApplication.class, args);
}
}
這時(shí)候, 如果直接運(yùn)行起程序, 是不會成功訪問的. 原因在于, mybatis的自動(dòng)化配置和自動(dòng)化創(chuàng)建, 沒有支持到多模塊中.
這時(shí)候, 需要我們手動(dòng)進(jìn)行配置和創(chuàng)建.
7.5 Mybatis java 配置
<!-- mybatis 的工廠 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml"/>
<!-- 自動(dòng)掃描mapping.xml文件 -->
<!--<property name="mapperLocations" value="classpath:mapper/*.xml" />-->
</bean>
<!-- DAO接口所在包名，Spring會自動(dòng)查找其下的類 -->
<bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="cn.elvinle.bookshop.mapper" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
可以對照著上面的配置文件, 進(jìn)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, 到這里, 就可以把程序跑起來了, 看一下結(jié)果:
以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。
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