在pom.xml中添加依赖时语法如下
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>1.2.6</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>1.2.6</version>
</dependency>
有这样一个问题，在spring的依赖中，我们需要引用一系列版本的spring，如版本1.2.6。每次都写不利于维护
解决办法:
在pom.xml定义properties标签
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<spring.version>1.2.6</spring.version>
<developer.organization><![CDATA[xy公司]]></developer.organization>
</properties>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency>