pom.xml中properties作用

<properties>

        <spring-version>4.3.7.RELEASE</spring-version>

    </properties>


    <!--dependencies-->


    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</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>

    </dependencies>

 类似上面的代码，可以在properties下声明相应的版本信息，然后在dependency下引用的时候用${spring-version}就可以引入该版本jar包了