浅谈Spring解决jar包依赖的bom

名词解释：

BOM（bill of materials）：材料清单，用于解决jar包依赖的好方法。

Spring IO Platform

缘起：Spring起初只专注ioc和aop，现在已发展成一个庞大体系。比如security、mvc等。如此一来，不同模块或者与外部进行集成时，依赖处理就需要各自对应版本号。比如，较新spring与较老的quartz，它们集成就会遇到问题，给搭建和升级带来不便。因此Spring IO Platform应运而生，只要项目中引入了它，外部集成时依赖关系无需版本号。官网的原文如下：“when you do declare a dependency on something that's part of the Platform, you will now be able to omit the version number.”
举例如下：

<code style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">dependencies</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">dependency</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">groupId</span>></span>org.springframework<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">groupId</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">dependency</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">dependencies</span>></span></code><ul style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li></ul>

Spring IO Platform只是一个pom文件，记录了spring与其他开源项目对应的版本。省去了版本号，也就省去了处理依赖时的问题，因为Spring IO Platform中有最优的版本配置。

Spring相关的BOM

当然SpringSource为了解决这些Jar冲突，推出了各种BOM，当然最著名的就是spring platform io bom，其中最核心的三个是：spring-framework-bom、spring-boot-dependencies、platform-bom。

对于Spring工程来说，直接在pom.xml文件中添加如下配置代码，即可免去管理版本冲突的难题。

<code style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">dependencyManagement</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">dependencies</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">dependency</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">groupId</span>></span>org.springframework<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">groupId</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">artifactId</span>></span>spring-framework-bom<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">artifactId</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">version</span>></span>4.2.0.RELEASE<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">version</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">type</span>></span>pom<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">type</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">scope</span>></span>import<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">scope</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">dependency</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">dependency</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">groupId</span>></span>org.springframework.boot<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">groupId</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">artifactId</span>></span>spring-boot-dependencies<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">artifactId</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">version</span>></span>1.3.0.M2<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">version</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">type</span>></span>pom<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">type</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">scope</span>></span>import<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">scope</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">dependency</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">dependency</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">groupId</span>></span>io.spring.platform<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">groupId</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">artifactId</span>></span>platform-bom<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">artifactId</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">version</span>></span>1.1.3.RELEASE<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">version</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">type</span>></span>pom<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">type</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span style="box-sizing: border-box; color: rgb(0, 0, 136);">scope</span>></span>import<span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">scope</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">dependency</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">dependencies</span>></span> <span style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span style="box-sizing: border-box; color: rgb(0, 0, 136);">dependencyManagement</span>></span></code><ul style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li></ul>

参考文章

Introduction to spring io platform

总结

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