Maven项目的拆分与聚合
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---------------------siwuxie095
Maven 项目的拆分与聚合
1、对已有的Maven 项目 maven-ssh 先拆分,再聚合
(1)拆分思路:将DAO 层、Service 层、Web 层
的代码以及配置文件分别提取到三个表现上独立的项
目中(实际上并不独立)
(2)聚合思路:对拆分后的项目进行聚合
2、对应到Maven 中,就是父项目与子模块的概念
(1)父项目将子模块聚合在一起
(2)子模块继承父项目中的依赖
3、具体如下:
(1)ssh-parent(父项目)
(2)ssh-dao(子模块)
(3)ssh-service(子模块)
(4)ssh-web(子模块)
4、父项目和子模块的创建方法
(1)父项目:File->New->Maven Project
(2)子模块:选择父项目,右键->New->Other->Maven->Maven Module
「先有父项目,再有子模块」
注意:创建时要勾选跳过原型选项或跳过骨架选项
5、创建父项目ssh-parent
注意:打包方式(Packaging)要选择pom
6、父项目ssh-parent 目录结构一览:
当前父项目的核心配置文件
pom.xml:
<projectxmlns="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.siwuxie095.ssh</groupId>
<artifactId>ssh-parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<!--
modules标签用于配置子模块,其中的
内容无需手动配置,随着子模块的创建,
将自动生成
当然,也可以手动配置
-->
<modules>
<module>ssh-dao</module>
<module>ssh-service</module>
<module>ssh-web</module>
</modules>
<!--归类依赖 -->
<properties>
<struts.version>2.3.33</struts.version>
<spring.version>4.3.7.RELEASE</spring.version>
<hibernate.version>5.0.12.Final</hibernate.version>
</properties>
<dependencies>
<!-- +++++++ (1) Struts2相关 +++++++ -->
<!-- Struts2相关的基本依赖 -->
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-core</artifactId>
<version>${struts.version}</version>
<!--
由于 Struts2和 Hibernate中都有 javassist,
为避免冲突,留下高版本,排除低版本即可
这里,Struts2中的 javassist版本更低
-->
<exclusions>
<exclusion>
<groupId>javassist</groupId>
<artifactId>javassist</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- +++++++ (2) Spring相关 +++++++ -->
<!-- Spring相关的基本依赖 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- Spring AOP相关的依赖 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- Spring单元测试相关的依赖 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- +++++++ (3) Hibernate相关 +++++++ -->
<!-- Hibernate相关的基本依赖 -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.version}</version>
</dependency>
<!-- +++++++ (4) SSH整合相关 +++++++ -->
<!-- Struts2整合 Spring相关的依赖 -->
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-spring-plugin</artifactId>
<version>${struts.version}</version>
</dependency>
<!-- Spring整合 Web项目相关的依赖 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- Spring整合 Hibernate相关的依赖 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- +++++++ (5)数据库连接相关 +++++++ -->
<!-- JDBC驱动相关的依赖 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.43</version>
<scope>runtime</scope>
</dependency>
<!-- C3P0连接池相关的依赖 -->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<!-- +++++++ (6)日志相关 +++++++ -->
<!--日志相关的依赖 -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.25</version>
</dependency>
<!-- +++++++ (7)其它相关 +++++++ -->
<!-- JUnit相关的依赖 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- JSTL相关的依赖 -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- servlet-api相关的依赖 -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<!-- jsp-api相关的依赖 -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jsp-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
</project>
父项目中并不进行编码,它的主要作用是:
(1)在pom.xml 中声明依赖,子模块继承之
(2)在pom.xml 中将各个子模块聚合到一起
7、创建子模块ssh-dao
注意:打包方式(Packaging)要选择jar
8、子模块ssh-dao 目录结构一览:
(1)当前子模块的核心配置文件
pom.xml:
<projectxmlns="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>com.siwuxie095.ssh</groupId>
<artifactId>ssh-parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<artifactId>ssh-dao</artifactId>
</project>
(2)实体类及其Hibernate 映射配置文件
User.java:
package com.siwuxie095.entity;
public class User {
Integer uid;
String username;
String address;
public Integer getUid() {
return uid;
}
publicvoid setUid(Integer uid) {
this.uid = uid;
}
public String getUsername() {
return username;
}
publicvoid setUsername(String username) {
this.username = username;
}
public String getAddress() {
return address;
}
publicvoid setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return"User [uid=" + uid +", username=" + username +
", address=" + address +"]";
}
}
User.hbm.xml:
<?xmlversion="1.0"encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<classname="com.siwuxie095.entity.User"table="t_user">
<idname="uid"column="uid">
<generatorclass="native"></generator>
</id>
<propertyname="username"column="username"></property>
<propertyname="address"column="address"></property>
</class>
</hibernate-mapping>
(3)Hibernate 核心配置文件
hibernate.cfg.xml:
<?xmlversion="1.0"encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<propertyname="hibernate.show_sql">true</property>
<propertyname="hibernate.format_sql">true</property>
<!--注意:只有配置 hibernate.hbm2ddl.auto为 update,才能自动创建表 -->
<propertyname="hibernate.hbm2ddl.auto">update</property>
<propertyname="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<!--
原来的配置:
<property name="hibernate.current_session_context_class">thread</property>
在 SSH框架整合中会报错,要么将这个配置删了,要么改成如下配置
参考链接:http://blog.csdn.net/maoyuanming0806/article/details/61417995
-->
<propertyname="hibernate.current_session_context_class">
org.springframework.orm.hibernate5.SpringSessionContext
</property>
<!--
如果没有如下配置,控制台将有如下异常信息:
Disabling contextual LOB creation as createClob() method threw error :
java.lang.reflect.InvocationTargetException
*配置 *
<property name="hibernate.temp.use_jdbc_metadata_defaults">false</property>
其实该配置加不加都无所谓,并不影响什么
参考链接:http://blog.csdn.net/jiong_long/article/details/51340685
-->
<propertyname="hibernate.temp.use_jdbc_metadata_defaults">false</property>
<mappingresource="com/siwuxie095/entity/User.hbm.xml"/>
</session-factory>
</hibernate-configuration>
(4)DAO 接口及其实现类
UserDao.java:
package com.siwuxie095.dao;
import com.siwuxie095.entity.User;
public interface UserDao {
void add(User user);
}
UserDaoImpl.java:
package com.siwuxie095.dao.impl;
import org.springframework.orm.hibernate5.support.HibernateDaoSupport;
import com.siwuxie095.dao.UserDao;
import com.siwuxie095.entity.User;
/**
*让 DAO接口实现类继承 HibernateDaoSupport类,直接获取 HibernateTemplate
*/
public class UserDaoImplextends HibernateDaoSupportimplements UserDao {
@Override
publicvoid add(User user) {
//直接通过 this获取 HibernateTemplate,调用 save() 方法保存
this.getHibernateTemplate().save(user);
/*
*此时,也可以获取 SessionFactory
*
*法一:this.getSessionFactory()
*法二:this.getHibernateTemplate().getSessionFactory()
*
*
*此时,也可以获取 Session
*
*法一:this.getSessionFactory().getCurrentSession()
*法二:...
*/
}
}
(5)拆分后的Spring 核心配置文件
applicationContext-dao.xml:
<?xmlversion="1.0"encoding="UTF-8"?>
<beansxmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.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">
<!-- (1) -->
<!--配置 C3P0连接池 -->
<beanid="dataSource"class="com.mchange.v2.c3p0.ComboPooledDataSource">
<propertyname="driverClass"value="com.mysql.jdbc.Driver"/>
<!--
jdbc:mysql:///ssh_db是 jdbc:mysql://localhost:3306/ssh_db的简写
-->
<propertyname="jdbcUrl"value="jdbc:mysql:///ssh_db"/>
<propertyname="user"value="root"/>
<propertyname="password"value="8888"/>
</bean>
<!-- SessionFactory对象的创建交给 Spring进行管理 -->
<beanid="sessionFactory"
class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
<!--
因为在 Hibernate核心配置文件中,没有数据库配置,
而是在 Spring的核心配置文件中进行配置,所以需要
注入 dataSource
LocalSessionFactoryBean中有相关属性,所以可以
注入
-->
<propertyname="dataSource"ref="dataSource"></property>
<!--指定 Hibernate核心配置文件的位置 -->
<propertyname="configLocations"value="classpath:hibernate.cfg.xml"></property>
</bean>
<!-- (2) -->
<!--配置事务管理器 HibernateTransactionManager -->
<beanid="transactionManager"
class="org.springframework.orm.hibernate5.HibernateTransactionManager">
<!--注入 SessionFactory 对象 -->
<propertyname="sessionFactory"ref="sessionFactory"></property>
</bean>
<!--开启事务注解 -->
<tx:annotation-driventransaction-manager="transactionManager"/>
<!-- (3) -->
<!--配置 Dao实现类对象 -->
<beanid="userDaoImpl"class="com.siwuxie095.dao.impl.UserDaoImpl">
<!--注入 SessionFactory对象 -->
<propertyname="sessionFactory"ref="sessionFactory"></property>
</bean>
</beans>
9、创建子模块ssh-service
注意:打包方式(Packaging)要选择jar
10、子模块ssh-service 目录结构一览:
(1)当前子模块的核心配置文件
pom.xml:
<projectxmlns="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>com.siwuxie095.ssh</groupId>
<artifactId>ssh-parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<artifactId>ssh-service</artifactId>
<!--
ssh-service依赖于 ssh-dao,所以添加 ssh-dao 依赖
注意:由于添加了 ssh-dao 依赖,在对 ssh-service
执行 compile、test、install等命令之前,必须先将
ssh-parent安装(install)到本地仓库,否则这些命令
将执行失败
-->
<dependencies>
<dependency>
<groupId>com.siwuxie095.ssh</groupId>
<artifactId>ssh-dao</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
(2)Service 类
UserService.java:
package com.siwuxie095.service;
import org.springframework.transaction.annotation.Transactional;
import com.siwuxie095.dao.UserDao;
import com.siwuxie095.entity.User;
@Transactional
public class UserService {
private UserDao userDao;
publicvoid setUserDao(UserDao userDao) {
this.userDao = userDao;
}
publicvoid add(User user) {
userDao.add(user);
}
}
(3)拆分后的Spring 核心配置文件
applicationContext-service.xml:
<?xmlversion="1.0"encoding="UTF-8"?>
<beansxmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.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">
<!--配置 Service对象 -->
<beanid="userService"class="com.siwuxie095.service.UserService">
<propertyname="userDao"ref="userDaoImpl"></property>
</bean>
</beans>
11、创建子模块ssh-web
注意:打包方式(Packaging)要选择war
12、子模块ssh-web 目录结构一览:
(1)当前子模块的核心配置文件
pom.xml:
<projectxmlns="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>com.siwuxie095.ssh</groupId>
<artifactId>ssh-parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<artifactId>ssh-web</artifactId>
<packaging>war</packaging>
<!--
ssh-web依赖于 ssh-service,所以添加 ssh-service 依赖
注意:由于添加了 ssh-service 依赖,在对 ssh-web
执行 compile、test、install等命令之前,必须先将
ssh-parent安装(install)到本地仓库,否则这些命令
将执行失败
-->
<dependencies>
<dependency>
<groupId>com.siwuxie095.ssh</groupId>
<artifactId>ssh-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
(2)JSP 页面
add.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC"-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<metahttp-equiv="Content-Type"content="text/html; charset=UTF-8">
<title>添加用户</title>
</head>
<body>
<formaction="${pageContext.request.contextPath }/user_add.action"method="post">
用户名:<inputtype="text"name="username"/>
地址:<inputtype="text"name="address"/>
<inputtype="submit"name="提交"/>
</form>
</body>
</html>
succ.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC"-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<metahttp-equiv="Content-Type"content="text/html; charset=UTF-8">
<title>添加成功</title>
</head>
<body>
<h1>添加成功!<ahref="${pageContext.request.contextPath }/add.jsp">继续添加</a></h1>
</body>
</html>
(3)Action 类
UserAction.java:
package com.siwuxie095.action;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.siwuxie095.entity.User;
import com.siwuxie095.service.UserService;
public class UserActionextends ActionSupport implements ModelDriven<User> {
private User user=new User();
@Override
public User getModel() {
return user;
}
private UserService userService;
publicvoid setUserService(UserService userService) {
this.userService = userService;
}
public String add() {
userService.add(user);
return"add";
}
}
(4)拆分后的Spring 核心配置文件
applicationContext-action.xml:
<?xmlversion="1.0"encoding="UTF-8"?>
<beansxmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.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">
<!--配置 Action对象 -->
<!--
注意:由于 Action 对象是多实例的,所以服务器启动时,
不会被创建,只有在访问时,才会被创建
-->
<beanid="userAction"class="com.siwuxie095.action.UserAction"scope="prototype">
<propertyname="userService"ref="userService"></property>
</bean>
</beans>
(5)Struts2 核心配置文件
struts.xml:
<?xmlversion="1.0"encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<packagename="demo"extends="struts-default"namespace="/">
<actionname="user_*"class="userAction"method="{1}">
<resultname="add">/succ.jsp</result>
</action>
</package>
</struts>
(6)部署描述文件
web.xml:
<?xmlversion="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/javaeehttp://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"version="2.5">
<display-name>ssh-web</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<!--配置 Struts2的核心过滤器 -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--配置 Spring的监听器 ContextLoaderListener -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--
配置 Spring核心配置文件的位置(路径)
classpath和 classpath*的区别:
(1) classpath只会到指定的 class路径下查找文件
(2) classpath*不仅包括 class路径,还包括 jar包中,都会去查找文件
applicationContext-*.xml即以 applicationContext- 开头的 xml文件,*为通配符
-->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:applicationContext-*.xml</param-value>
</context-param>
</web-app>
13、至此,父项目和子模块创建完毕。父项目此时的目录
结构如下:
14、将父项目安装(install)到本地仓库中,否则子模块
之间的依赖无法生效。当然,也可按照创建顺序,依次将
父项目和子模块安装到本地仓库
15、最后,运行项目的两种方式
(1)运行父项目ssh-parent(建议)
父项目ssh-parent 将子模块聚合到一起。如果子模块内容有
所修改,不必立即安装到本地仓库,父项目将自动聚合并使用
最新代码执行
(2)运行子模块ssh-web
子模块ssh-web 将从本地仓库下载依赖的 jar 包,如果依赖
的其它子模块内容有所修改,必须及时安装到本地仓库
16、访问路径
http://localhost:8080/ssh-web/add.jsp
【made by siwuxie095】
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