在上文中，我们演示了Spring MVC Maven单模块SSM整合，一些中大型项目，我希望采用Maven多模块构建方式来搭建SSM整合项目。下面在IDEA中演示如何使用Maven的多模块方式构建SSM项目。
Maven多模块构建SSH项目架构图：
1 建立parent工程
1.1 建立父工程模块
1.2 配置父工程的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>
<groupId>com.yiidian</groupId>
<artifactId>yiidian-parent</artifactId>
<version>1.0-SNAPSHOT</version>
<!--
SSM整合的基础依赖
-->
<!-- 1.spring相关的依赖 -->
<dependencies>
<!-- 1.1 ioc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!--1.2 aop -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.7</version>
</dependency>
<!-- 1.3 声明式事务-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!-- 1.4 test -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<!-- 2. mybatis相关依赖 -->
<!-- 2.1 mysql驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.46</version>
</dependency>
<!-- 2.2 数据源 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.6</version>
</dependency>
<!-- 2.3 mybatis核心包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
<!-- 3. springmvc相关依赖-->
<!-- 3.1 springmvc核心包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!--3.2 servlet依赖 -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<!--3.3 jstl标签库-->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- 4. log4j日志 -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- 5. spring与mybatis整合包 *** -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.1</version>
</dependency>
</dependencies>
</project>
2 建立Domain工程
2.1 建立子模块
点击父工程右键->Module
2.2 编写Pojo类
package com.yiidian.domain;
import java.util.Date;
/**
* 实体类
* 一点教程网 - www.yiidian.com
*/
public class User {
private Integer id;
private String username;
private Date birthday;
private String sex;
private String address;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", birthday=" + birthday +
", sex='" + sex + '\'' +
", address='" + address + '\'' +
'}';
}
}
2.3 项目结构
3 建立Dao工程
3.1 建立子模块
3.2 依赖domain工程
<dependencies>
<dependency>
<groupId>com.yiidian</groupId>
<artifactId>yiidian-domain</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
3.3 编写Dao接口
package com.yiidian.dao;
import com.yiidian.domain.User;
import org.apache.ibatis.annotations.Select;
import java.util.List;
/**
* Dao接口
*/
public interface UserDao {
/**
* 查询所有账户
*/
@Select("select * from user")
public List<User> findAll();
}
3.4 编写Spring的Dao配置
内容如下：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 1. 创建数据源 -->
<context:property-placeholder location="classpath:jdbc.properties"/>
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="url" value="${jdbc.url}"/>
<property name="driverClassName" value="${jdbc.driver}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<!-- 2. 为了创建Dao代理对象，先创建SqlSessionFactory对象 -->
<!-- SqlSessionFactoryBean: 创建SqlSessionFactory对象的工具 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 注入数据源 -->
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 3. 扫描Dao接口所在包，扫描后用于创建Dao代理对象，把代理对象放入IOC容器 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- Dao扫描目录 -->
<property name="basePackage" value="com.yiidian.dao"/>
</bean>
</beans>
applicationContext-dao.xml文件只存放与Dao有关的配置
3.5 准备jdbc.properties文件
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf8
jdbc.username=root
jdbc.password=root
jdbc.initialSize=3
jdbc.maxActive=10
4 建立Service工程
4.1 建立子模块
4.2 依赖Dao工程
<dependencies>
<dependency>
<groupId>com.yiidian</groupId>
<artifactId>yiidian-dao</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
4.3 编写Service接口和实现
Service接口
package com.yiidian.service;
import com.yiidian.domain.User;
import java.util.List;
/**
* 业务层接口
* 一点教程网 - www.yiidian.com
*/
public interface UserService {
/**
* 查询所有用户
*/
public List<User> findAll();
}
Service实现类
package com.yiidian.service.impl;
import com.yiidian.dao.UserDao;
import com.yiidian.domain.User;
import com.yiidian.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
*业务层实现类
* 一点教程网 - www.yiidian.com
*/
@Service
public class UserServiceImpl implements UserService{
//注入Dao对象
@Autowired
private UserDao userDao;
@Override
public List<User> findAll() {
return userDao.findAll();
}
}
4.4 编写Spring的Service配置
内容如下：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<!--扫描Service接口-->
<context:component-scan base-package="com.yiidian.service"/>
<!--Spring声明式事务-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!--事务通知-->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="get*" isolation="DEFAULT" propagation="SUPPORTS" read-only="true"/>
<tx:method name="load*" isolation="DEFAULT" propagation="SUPPORTS" read-only="true"/>
<tx:method name="select*" isolation="DEFAULT" propagation="SUPPORTS" read-only="true"/>
<tx:method name="find*" isolation="DEFAULT" propagation="SUPPORTS" read-only="true"/>
<tx:method name="*" isolation="DEFAULT" propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
<!--事务切面-->
<aop:config>
<!--切入点-->
<aop:pointcut id="pt" expression="execution(* com.yiidian.service.impl.*ServiceImpl.*(..))"/>
<!--切面-->
<aop:advisor advice-ref="txAdvice" pointcut-ref="pt"/>
</aop:config>
</beans>
该配置主要需要扫描Service实现类和配置Spring声明式事务。
5 建立Web工程
5.1 建立子模块
5.2 依赖Service工程
<dependencies>
<dependency>
<groupId>com.yiidian</groupId>
<artifactId>yiidian-service</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
该项目为Web项目
5.3 配置监听器和核心控制器
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:applicationContext-*.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 配置核心控制器 -->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
这里注意Spring监听器读取的路径为classpath*:，这个语法指加载当前项目及依赖工程的所有符合条件的文件。因为applicationContext.xml分布在不同的Maven工程，所以必须使用该语法加载！
5.4 springmvc.xml配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 1.扫描控制器 -->
<context:component-scan base-package="com.yiidian.controller"/>
<!-- 2.视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/pages/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!-- 3.创建处理器映射器和处理器适配器 -->
<mvc:annotation-driven/>
</beans>
5.5 编写UserController
package com.yiidian.controller;
import com.yiidian.domain.User;
import com.yiidian.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;
/**
* 控制器
* 一点教程网 - www.yiidian.com
*/
@Controller
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
/**
* 查询所有用户
*/
@RequestMapping("/list")
public String list(Model model){
//调用业务层方法
List<User> list = userService.findAll();
//存入数据到request域
model.addAttribute("list",list);
//返回list.jsp页面
return "list";
}
}
5.6 编写JSP显示数据
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>一点教程网-显示用户数据</title>
</head>
<body>
<h3>用户列表</h3>
| 编号|用户名|生日|性别|地址|
| :-----: | :-----: | :-----: | :-----: | :-----: |
| 编号 | 用户名 | 生日 | 性别 | 地址 |
| ${user.id} | ${user.username} | ${user.birthday} | ${user.sex} | ${user.address} |
</body>
</html>
5.7 最终项目结构
5.8 运行Web项目，访问测试
