第一讲：

maven

    maven是基于项目对象模型（POM），可以通过一小段描述信息来管理项目的构建，报告和文档的软件项目管理工具。

maven安装与下载：

    、确定jdk已经安装并且配置

    、安装maven

    、配置maven环境变量：M2_HOME D:\maven\apache-maven-3.3. （就是maven的安装目录）

HelloWorld的实现

    modelVersion:POM模型版本4..0固定

    groupId：一般指某个公司或者某个组织的某个项目，比如org.springframework

    artifactId：一般指某个具体项目的某个具体模块，比如spring-context

    Version：项目的版本

    Maven常见命令：

        complie 编译

        clean 清空

        test 测试

        package 打包

        install 将项目安装到本地仓库

    Mvn远程仓库地址：http://mvnrepository.com/

第二讲，我的实践：

使用idea创建helloWorld的maven项目：

Mvn远程仓库地址：http://mvnrepository.com/ 这个很重要，我们的需要什么jar包都可以在上面搜寻坐标
idea的时候文件夹的颜色标识这个也重要，不然可能无法new出想要的file

然后就是测试各个maven命令：

第三讲：

maven仓库的概念：

Maven远程仓库配置文件：
$M2_HOME/lib/maven-model-builder-3.3.9jar
下的文件：org/apache/maven/model/pom-4.0.0.xml

-<repositories>

-<repository>

<id>central</id>

<name>Central Repository</name>

<url>https://repo.maven.apache.org/maven2</url>

<layout>default</layout>

-<snapshots>

<enabled>false</enabled>

</snapshots>

</repository>

</repositories>

maven依赖：
我们可以将一个项目install到本地仓库，然后本地其他项目引用这个项目，就是引用这个项目的下标，如：
<dependencies>
<dependency>
<groupId>com.java1234.user</groupId>
<artifactId>user-dao</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
我们做个例子：
使用maven创建ssm项目的各个模块并且成功运行：
关键代码：

其实没有什么关键代码，就是ssm的整合搭建

依赖的特性：

　　最短路径原则和最先声明原则。就是如果A项目中引用了B和C项目，B中间接引用了F，C直接引用了F，那么A中引用F依赖是通过C来达到的，就近原则。当两边路径相等的时候，哪个项目被先引用就使用哪个项目得到依赖。

第四讲：

maven的聚合与继承：
聚合：
新的maven项目中，这样聚合其他项目：

<modules>

<module>../user-dao</module>

<module>../user-service</module>

</modules>

注意该项目中package只能为pom：

<packaging>pom</packaging>

作用：方便统一管理

继承：
继承实现：
新建父项目，然后在子项目坐标前加上继承描述：

<parent>

<groupId>com.java1234.user</groupId>

<artifactId>user-parent</artifactId>

<version>1.0-SNAPSHOT</version>

<relativePath>../user-parent/pom.xml</relativePath>

</parent>

relativePath一定要加上。

注意：一定要在子项目坐标前，然后就可以使用继承了。
方便版本版本管理与依赖管理
使用了继承子项目的groupId可以删掉了，默认使用的是父项目的groupId。默认状况下 version和packing也是继承父项目的，适当情况下可以省略不写。webapp项目注意packing不要省略，因为父项目一般是jar形式打包，webapp是war包
每个子项目中都有好多jar，它们可能太多的时候导致版本混乱，这样的话我们可以将这些依赖都假如到父类的dependency里面，然后子模块继承父模块可以省略子模块中的版本和scope。都使用父类的版本其他。

注意是放在dependencyManagement里面的dependencies里面添加依赖

<dependencyManagement>

<dependencies>

<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-context</artifactId>

<version>${spring.version}</version>

</dependency>

</dependencies>

可以在pom里面声明版本属性，然后在dependency里面应用它，我们常用来管理版本，使用方式看例子：

<properties>

<spring.version>4.3..RELEASE</spring.version>

<mybatis.version>3.4.</mybatis.version>

</properties>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-context</artifactId>

<version>${spring.version}</version>

</dependency>

我再父项目中装载了其他的子项目，便于管理。使用的idea，感觉还是新建一个项目和新建其他模块比较好一点。虽然效果好像差不多。

 

最终的项目各模块的pom：
<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/maven-v4_0_0.xsd">

  <modelVersion>4.0.</modelVersion>

    <parent>

        <groupId>com.java1234.user</groupId>

        <artifactId>user-parent</artifactId>

        <version>1.0-SNAPSHOT</version>

        <relativePath>../user-parent/pom.xml</relativePath>

    </parent>

  <artifactId>user-web</artifactId>

  <packaging>war</packaging>

  <name>user-web Maven Webapp</name>

  <url>http://maven.apache.org</url>

  <dependencies>

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->

    <dependency>

      <groupId>javax.servlet</groupId>

      <artifactId>javax.servlet-api</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/jsp-api -->

    <dependency>

      <groupId>javax.servlet.jsp</groupId>

      <artifactId>jsp-api</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->

    <dependency>

      <groupId>javax.servlet</groupId>

      <artifactId>jstl</artifactId>

    </dependency>

    <dependency>

      <groupId>com.java1234.user</groupId>

      <artifactId>user-service</artifactId>

      <version>1.0-SNAPSHOT</version>

    </dependency>

  </dependencies>

  <build>

    <finalName>user-web</finalName>

  </build>

</project>

user-web的pom

<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.</modelVersion>

  <parent>

    <groupId>com.java1234.user</groupId>

    <artifactId>user-parent</artifactId>

    <version>1.0-SNAPSHOT</version>

    <relativePath>../user-parent/pom.xml</relativePath>

  </parent>

  <artifactId>user-dao</artifactId>

  <packaging>jar</packaging>

  <dependencies>

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->

    <dependency>

      <groupId>org.mybatis</groupId>

      <artifactId>mybatis</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->

    <dependency>

      <groupId>mysql</groupId>

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

    </dependency>

</dependencies>

</project>

user-dao的web

<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.</modelVersion>

  <parent>

    <groupId>com.java1234.user</groupId>

    <artifactId>user-parent</artifactId>

    <version>1.0-SNAPSHOT</version>

    <relativePath>../user-parent/pom.xml</relativePath>

  </parent>

  <artifactId>user-service</artifactId>

  <packaging>jar</packaging>

  <dependencies>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-context</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-context-support -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-context-support</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-core</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-beans</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-web</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-webmvc</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-jdbc</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-aop</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-tx</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-aspects -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-aspects</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->

    <dependency>

      <groupId>org.mybatis</groupId>

      <artifactId>mybatis-spring</artifactId>

    </dependency>

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

    </dependency>

    <dependency>

      <groupId>com.java1234.user</groupId>

      <artifactId>user-dao</artifactId>

      <version>1.0-SNAPSHOT</version>

    </dependency>

  </dependencies>

</project>

user-service的web

<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.</modelVersion>

  <parent>

    <groupId>com.java1234.user</groupId>

    <artifactId>user-parent</artifactId>

    <version>1.0-SNAPSHOT</version>

    <relativePath>../user-parent/pom.xml</relativePath>

  </parent>

  <artifactId>user-service</artifactId>

  <packaging>jar</packaging>

  <dependencies>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-context</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-context-support -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-context-support</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-core</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-beans</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-web</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-webmvc</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-jdbc</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-aop</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-tx</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-aspects -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-aspects</artifactId>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->

    <dependency>

      <groupId>org.mybatis</groupId>

      <artifactId>mybatis-spring</artifactId>

    </dependency>

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

    </dependency>

    <dependency>

      <groupId>com.java1234.user</groupId>

      <artifactId>user-dao</artifactId>

      <version>1.0-SNAPSHOT</version>

    </dependency>

  </dependencies>

</project>

user-aggregator的pom

<?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.</modelVersion>

    <groupId>com.java1234.user</groupId>

    <artifactId>user-parent</artifactId>

    <version>1.0-SNAPSHOT</version>

    <packaging>pom</packaging>

    <properties>

        <spring.version>4.3..RELEASE</spring.version>

        <mybatis.version>3.4.</mybatis.version>

    </properties>

    <modules>

        <module>../user-dao</module>

        <module>../user-service</module>

        <module>../user-web</module>

    </modules>

    <dependencyManagement>

        <dependencies>

            <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->

            <dependency>

                <groupId>org.springframework</groupId>

                <artifactId>spring-context</artifactId>

                <version>${spring.version}</version>

            </dependency>

            <!-- https://mvnrepository.com/artifact/org.springframework/spring-context-support -->

            <dependency>

                <groupId>org.springframework</groupId>

                <artifactId>spring-context-support</artifactId>

                <version>${spring.version}</version>

            </dependency>

            <!-- 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>

            <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->

            <dependency>

                <groupId>org.springframework</groupId>

                <artifactId>spring-web</artifactId>

                <version>${spring.version}</version>

            </dependency>

            <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->

            <dependency>

                <groupId>org.springframework</groupId>

                <artifactId>spring-webmvc</artifactId>

                <version>${spring.version}</version>

            </dependency>

            <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->

            <dependency>

                <groupId>org.springframework</groupId>

                <artifactId>spring-jdbc</artifactId>

                <version>${spring.version}</version>

            </dependency>

            <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop -->

            <dependency>

                <groupId>org.springframework</groupId>

                <artifactId>spring-aop</artifactId>

                <version>${spring.version}</version>

            </dependency>

            <!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->

            <dependency>

                <groupId>org.springframework</groupId>

                <artifactId>spring-tx</artifactId>

                <version>${spring.version}</version>

            </dependency>

            <!-- https://mvnrepository.com/artifact/org.springframework/spring-aspects -->

            <dependency>

                <groupId>org.springframework</groupId>

                <artifactId>spring-aspects</artifactId>

                <version>${spring.version}</version>

            </dependency>

            <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->

            <dependency>

                <groupId>org.mybatis</groupId>

                <artifactId>mybatis-spring</artifactId>

                <version>1.3.</version>

            </dependency>

            <!-- https://mvnrepository.com/artifact/junit/junit -->

            <dependency>

                <groupId>junit</groupId>

                <artifactId>junit</artifactId>

                <version>4.12</version>

            </dependency>

            <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->

            <dependency>

                <groupId>org.mybatis</groupId>

                <artifactId>mybatis</artifactId>

                <version>${mybatis.version}</version>

            </dependency>

            <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->

            <dependency>

                <groupId>mysql</groupId>

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

                <version>5.1.</version>

            </dependency>

            <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->

            <dependency>

                <groupId>javax.servlet</groupId>

                <artifactId>javax.servlet-api</artifactId>

                <version>3.1.</version>

            </dependency>

            <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/jsp-api -->

            <dependency>

                <groupId>javax.servlet.jsp</groupId>

                <artifactId>jsp-api</artifactId>

                <version>2.2</version>

            </dependency>

            <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->

            <dependency>

                <groupId>javax.servlet</groupId>

                <artifactId>jstl</artifactId>

                <version>1.2</version>

            </dependency>

        </dependencies>

    </dependencyManagement>

</project>

user-parent的pom

 

最新文章

  1. iOS改变字母的大小写
  2. JPush API client library for C Sharp(极光推送API)
  3. vm centos 添加网卡 无配置文件
  4. PHP代码质量优化
  5. Codeforces Round #331 (Div. 2)
  6. AJAX 数据库实例
  7. 交易Txt文件导出
  8. python的内存管理
  9. 好记心不如烂笔头之JQuery学习，第四章
  10. jquery index（）方法
  11. CF 560e Gerald and Giant Chess
  12. hql注意事项一
  13. failure injection
  14. 《head first python》第一章《初识python》总结
  15. nginx配置参数详解
  16. mysql数据导入方法
  17. php-redis 操作类 封装
  18. vuedraggable(vue2.0)组件详解
  19. 红米Note 7 Pro在印度首销迅速售罄
  20. SpringBatch 错误积累

热门文章

  1. iOS 工程功能实现之好用的第三方
  2. MFC编程入门之二十一（常用控件：编辑框Edit Control）
  3. jQuery插件解析
  4. python——操作Redis
  5. div在不固定高度的情况下垂直或者水平居中
  6. 内存分配与Segmentation fault
  7. IE兼容问题，各类css hack代码（亲测有效）
  8. 收藏夹里的js
  9. table表单中的td内容两端对齐
  10. Mac OS 下 mysql 找不到 mysql.sock 的问题