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使用IDEA将ssm项目模块化

创建父项目

首先创建一个maven项目叫ssm_parent, 可以把src文件夹删除掉, 父项目用不到. 最终也不会去编译父项目. 把pom.xml 的打包方式改成pom.

    <modelVersion>4.0.0</modelVersion>
    <packaging>pom</packaging>
    <groupId>cn.lacknb.parent</groupId>
    <artifactId>ssm_parents</artifactId>
    <version>1.0-SNAPSHOT</version>

导入所有我们需要的jar包, 由父项目统一版本号. <dependencyManagement> 不会让子模块继承依赖, 当子模块需要的时候, 通过填写指定依赖使用, (不用再写版本号 , 由父项目统一管理)

<dependencyManagement>
        <dependencies>

            <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-beans</artifactId>
                <version>${spring.version}</version>
            </dependency>

            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>${spring.version}</version>
            </dependency>

            <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>

            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-expression</artifactId>
                <version>${spring.version}</version>
            </dependency>

			<dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aop</artifactId>
                <version>${spring.version}</version>
            </dependency>

            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-tx</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-web</artifactId>
                <version>${spring.version}</version>
            </dependency>

            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${spring.version}</version>
            </dependency>


            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>${mybatis.version}</version>
            </dependency>


            <dependency>
                <groupId>org.json</groupId>
                <artifactId>json</artifactId>
                <version>20090211</version>
            </dependency>

            <dependency>
                <groupId>org.apache.tomcat</groupId>
                <artifactId>tomcat-servlet-api</artifactId>
                <version>${tomcat.version}</version>
            </dependency>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>jstl</artifactId>
                <version>1.2</version>
            </dependency>
            <dependency>
                <groupId>taglibs</groupId>
                <artifactId>standard</artifactId>
                <version>1.1.2</version>
            </dependency>

            <!--    spring与mybatis整合包-->
            <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis-spring</artifactId>
                <version>${mybatis-spring.version}</version>
            </dependency>

            <!--        Druid数据源-->
            <!--         https://mvnrepository.com/artifact/com.alibaba/druid -->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>${com.alibaba}</version>
            </dependency>


            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql-connector}</version>
            </dependency>

        </dependencies>
</dependencyManagement>

创建子模块dao层

当子模块需要某个依赖时, 可以在子模块下的pom.xml进行配置, 可以把配置文件所需要的部分抽离出来, 当不再有错误报出的时候. 就行了. 打包格式为jar

<?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">
    <parent>
        <artifactId>ssm_parents</artifactId>
        <groupId>cn.lacknb.parent</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <packaging>jar</packaging>
    <groupId>cn.lacknb.dao</groupId>
    <artifactId>ssm_dao</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

    </dependencies>

</project>

创建子模块service层

和上一个子模块一样, 需要什么依赖, 就导什么依赖. 直到没有错误为止. 这个打包格式也是jar包

<?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">
    <parent>
        <artifactId>ssm_parents</artifactId>
        <groupId>cn.lacknb.parent</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <packaging>jar</packaging>
    <groupId>cn.lacknb.service</groupId>
    <artifactId>ssm_servce</artifactId>
    <dependencies>
        <dependency>
            <groupId>cn.lacknb.dao</groupId>
            <artifactId>ssm_dao</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-servlet-api</artifactId>
        </dependency>

        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
        </dependency>
    </dependencies>

</project>

创建子模块view层

这个maven项目可以创建成web项目, 这里需要我们的视图层的文件. 这个打包格式是war包

<?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">
    <parent>
        <artifactId>ssm_parents</artifactId>
        <groupId>cn.lacknb.parent</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <packaging>war</packaging>
    <groupId>cn.lacknb.view</groupId>
    <artifactId>ssm_view</artifactId>

    <dependencies>
        <dependency>
            <groupId>cn.lacknb.dao</groupId>
            <artifactId>ssm_dao</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>cn.lacknb.service</groupId>
            <artifactId>ssm_servce</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>

        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
        </dependency>

    </dependencies>

</project>

配置web.xml, 当Spring配置的文件太多的时候, 可以使用通配符的方式进行批量加载.

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">

<display-name>Archetype Created Web Application</display-name>

  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc-servlet.xml</param-value>
    </init-param>
    <!--表示容器在启动时加载-->
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>

  <!--防止中文乱码-->
  <filter>
    <filter-name>CharacterEncoding</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>utf-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>CharacterEncoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!--配置spring 监听器-->


  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <context-param>
    <param-name>contextConfigLocation</param-name>
      <!-- classpath*: 匹配所有依赖jar包的类路径下 -->
    <param-value>classpath*:applicationContext.xml</param-value>
  </context-param>

</web-app>

springmvc.xml

    <!--配置只扫描Controller注解-->
    <context:component-scan base-package="cn.lacknb.controller">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    <!--启动各种器, 包括注解的-->
    <mvc:annotation-driven/>

    <!-- 不扫描Controller注解 -->
    <context:component-scan base-package="cn.lacknb">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

当不再有错误报出了, 就可以运行了.

运行方式有两种:(都是运行 web项目)

1. 通过maven中的tomcat插件 maven run:tomcat7
	2. 通过把web项目 部署到tomcat上

最后通过maven的热部署, 推送到服务器上.