分模块构建工程
基于上边的三个工程分析,我们将持久层，业务层、控制器和试图表现层可以分为三个不同的模块来处理，创建一个parent工程将通用的pom配置抽取出来，然后聚合多个模块运行。
3.1需求
3.1.1需求描述
将SSM工程拆分为多个模块开发：
Dao模块
Service模块
Web模块
3.1.2理解继承和聚合
通常继承和聚合同时使用。
- 何为继承？
继承是为了消除重复，如果将dao、service、web分开创建独立的工程则每个工程的pom.xml文件中的内容存在重复，如设置编译版本、锁定spring的版本的等，可以将这些重复的配置提取出来在父工程的pom.xml中定义。
- 何为聚合？
开发通常是分组分模块开发，每个模块开发完成要运行整个工程需要将每个模块聚合在一起运行，比如：dao、service、web三个工程最终会打一个独立的war运行。
3.2案例实现
3.2.1 ssm-parent父模块
3.2.1.1创建父工程
这里选择“跳过骨架选择”
定义坐标：
3.2.1.2定义pom.xml
在父工程的pom.xml中抽取一些重复的配置的，比如：锁定jar包的版本、设置编译版本等。
| <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.igeekhome.ssm</groupId> <artifactId>ssm-parent</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>pom</packaging>
<properties> <junit.version>4.12</junit.version> <servlet-api.version>3.0-alpha-1</servlet-api.version> <spring.version>4.3.6.RELEASE</spring.version> <mybatis.version>3.4.2</mybatis.version> <mybatis-spring.version>1.3.1</mybatis-spring.version> <mysql.version>5.1.19</mysql.version> <druid.version>1.0.28</druid.version> <aspectjweaver.version>1.8.10</aspectjweaver.version> <slf4j.version>1.7.24</slf4j.version> <log4j.version>1.2.17</log4j.version> <jstl.version>1.2</jstl.version> </properties>
<!-- 添加工程的依赖 --> <dependencyManagement> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency> <!-- servlet-api JSP页面编译时需要的包 --> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>${servlet-api.version}</version> <scope>provided</scope> </dependency> <!-- Spring 以及 SpringMVC需要引入的包，自动引入需要参照的包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <!-- 持久层的包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>${mybatis.version}</version> </dependency> <!-- Spring 和 Mybatis的整合包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>${mybatis-spring.version}</version> </dependency> <!-- Mysql驱动包 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <!-- druid数据库连接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>${druid.version}</version> </dependency>
<dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>${aspectjweaver.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> </dependency> <!-- 打日志的 --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>${slf4j.version}</version> <scope>runtime</scope> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>jcl-over-slf4j</artifactId> <version>${slf4j.version}</version> <scope>runtime</scope> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>${log4j.version}</version> <scope>runtime</scope> </dependency> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>${jstl.version}</version> <scope>provided</scope> </dependency> </dependencies> </dependencyManagement> <build> <finalName>ssm</finalName> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> <include>**/*.properties</include> </includes> </resource> <resource> <directory>src/main/resources</directory> <includes> <include>**/*.xml</include> <include>**/*.properties</include> <include>**/*.ini</include> </includes> </resource> </resources> <pluginManagement> <plugins> <!-- 设置编译版本为1.8 --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.8</source> <target>1.8</target> <encoding>UTF-8</encoding> </configuration> </plugin>
<!-- Jetty插件，提供一种web容器 --> <plugin> <groupId>org.eclipse.jetty</groupId> <artifactId>jetty-maven-plugin</artifactId> <version>9.4.2.v20170220</version> <configuration> <httpConnector> <!-- 配置运行的端口号 --> <port>80</port> </httpConnector> <!-- 配置扫描的时间间隔 --> <scanIntervalSeconds>1</scanIntervalSeconds> <webApp> <!-- 配置上下文 --> <contextPath>/ssm</contextPath> </webApp> </configuration> </plugin> </plugins> </pluginManagement> </build> </project> |
3.2.1.3将父工程发布至仓库
父工程创建完成执行maven-install将父工程发布到仓库方便子工程继承：
3.2.2ssm-dao子模块
3.2.2.1创建dao子模块
选择ssm-parent工程添加模块
这里指定模块名称，选择“跳过骨架选择”，并设置模块名称
3.2.2.2定义pom.xml
dao模块的pom.xml文件中需要继承父模块，添加持久层需要的依赖坐标：
| <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>com.igeekhome.ssm</groupId> <artifactId>ssm-parent</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>ssm-dao</artifactId> <packaging>jar</packaging>
<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <scope>test</scope> </dependency> <!-- 持久层的包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> </dependency> <!-- Spring 和 Mybatis的整合包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> </dependency> <!-- Mysql驱动包 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <!-- druid数据库连接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> </dependency> </dependencies> </project> |
3.2.2.3dao
将ssm工程中的dao接口，mapper配置文件及domain类拷贝到src/main/java中：
3.2.2.4配置文件
拷贝ssm工程中如下配置文件到dao工程：
3.2.2.5单元测试
| package com.igeekhome.ssm.tests;
import org.junit.Test; import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.igeekhome.ssm.dao.EmployeeMapper; import com.igeekhome.ssm.domain.Employee;
public class EmployeeTest {
@Test public void testFindEmployeeById(){ //加载配置文件 ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext(new String[]{"applicationContext.xml", "spring-mybatis.xml"}); //获取dao EmployeeMapper employeeMapper = applicationContext.getBean(EmployeeMapper.class); //查询数据 Employee employee = employeeMapper.selectByPrimaryKey(7369); //查看数据 System.out.println(employee.getEname()); //关闭上下文 applicationContext.close(); } } |
3.2.3ssm-service子模块
3.2.3.1创建service子模块
方法同ssm-dao模块创建方法，模块名称为ssm-service。
3.2.3.2定义pom.xml
service模块的pom.xml文件中需要继承父模块，service依赖dao模块：
| <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>com.igeekhome.ssm</groupId> <artifactId>ssm-parent</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>ssm-service</artifactId> <packaging>jar</packaging>
<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>com.igeekhome.ssm</groupId> <artifactId>ssm-dao</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> </dependencies> </project> |
3.2.3.3service接口
将ssm工程中的service接口拷贝到src/main/java中：
3.2.3.4配置文件
拷贝ssm工程中如下配置文件到service工程：
3.2.3.5单元测试
| package com.igeekhome.ssm.tests;
import org.junit.Test; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.igeekhome.ssm.domain.Employee; import com.igeekhome.ssm.service.EmployeeService;
public class EmployeeTest {
@Test public void testFindEmployeeById(){ //加载配置文件 ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext(new String[]{"applicationContext.xml", "spring-mybatis.xml"}); //获取dao EmployeeService employeeService = applicationContext.getBean(EmployeeService.class); //查询数据 Employee employee = employeeService.selectByPrimaryKey(7369); //查看数据 System.out.println(employee.getEname()); //关闭上下文 applicationContext.close(); } } |
3.2.4ssm-web子模块
3.2.4.1创建web子模块
方法同ssm-dao模块创建方法，模块名称为ssm-web。
3.2.4.2定义pom.xml
| <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>com.igeekhome.ssm</groupId> <artifactId>ssm-parent</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>ssm-web</artifactId> <packaging>war</packaging> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <scope>test</scope> </dependency> <!-- servlet-api JSP页面编译时需要的包 --> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <scope>provided</scope> </dependency> <!-- Spring 以及 SpringMVC需要引入的包，自动引入需要参照的包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> </dependency> <!-- 打日志的 --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>jcl-over-slf4j</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <scope>provided</scope> </dependency> <dependency> <groupId>com.igeekhome.ssm</groupId> <artifactId>ssm-service</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> </dependencies> <build> <finalName>ssm</finalName> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> <include>**/*.properties</include> </includes> </resource> <resource> <directory>src/main/resources</directory> <includes> <include>**/*.xml</include> <include>**/*.properties</include> <include>**/*.ini</include> </includes> </resource> </resources> <plugins> <!-- 设置编译版本为1.8 --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.8</source> <target>1.8</target> <encoding>UTF-8</encoding> </configuration> </plugin>
<!-- Jetty插件，提供一种web容器 --> <plugin> <groupId>org.eclipse.jetty</groupId> <artifactId>jetty-maven-plugin</artifactId> <configuration> <httpConnector> <!-- 配置运行的端口号 --> <port>80</port> </httpConnector> <!-- 配置扫描的时间间隔 --> <scanIntervalSeconds>1</scanIntervalSeconds> <webApp> <!-- 配置上下文 --> <contextPath>/ssm</contextPath> </webApp> </configuration> </plugin> </plugins> </build> </project> |
3.2.4.3Controller
将ssm工程中的controller拷贝到src/main/java中：
3.2.4.4配置文件
将ssm工程中的配置文件拷贝到src/main/resources中
将ssm工程中的WEB-INF中的文件拷贝到项目的webapp中
3.2.5运行调试
方法1：在maven-web工程的pom.xml中配置tomcat插件运行
运行maven-web工程它会从本地仓库下载依赖的jar包，所以当maven-web依赖的jar包内容修改了必须及时发布到本地仓库，比如：maven-web依赖的maven-service修改了，需要及时将maven-service发布到本地仓库。
方法2：在父工程的pom.xml中配置tomcat插件运行，自动聚合并执行
推荐方法2，如果子工程都在本地，采用方法2则不需要子工程修改就立即发布到本地仓库，父工程会自动聚合并使用最新代码执行。
注意：如果子工程和父工程中都配置了tomcat插件，运行的端口和路径以子工程为准。