maven依赖版本号统一规范；

pom.xml

         <module>xxl-job-executor-springboot-example</module>
     </modules>
 
+	<properties>
+		<javax.servlet-api.version>3.0.1</javax.servlet-api.version>
+		<jsp-api.version>2.2</jsp-api.version>
+
+		<spring.version>3.2.18.RELEASE</spring.version>
+		<jackson-mapper-asl.version>1.9.13</jackson-mapper-asl.version>
+		<aspectjweaver.version>1.8.7</aspectjweaver.version>
+		<slf4j-api.version>1.7.25</slf4j-api.version>
+		<freemarker.version>2.3.20</freemarker.version>
+		<junit.version>4.11</junit.version>
+
+		<jetty-server.version>9.2.22.v20170606</jetty-server.version>
+		<hessian.version>4.0.38</hessian.version>
+		<httpclient.version>4.3.6</httpclient.version>
+
+		<commons-exec.version>1.3</commons-exec.version>
+		<commons-beanutils.version>1.9.2</commons-beanutils.version>
+		<commons-lang.version>2.6</commons-lang.version>
+
+		<c3p0.version>0.9.5.2</c3p0.version>
+		<mysql-connector-java.version>5.1.29</mysql-connector-java.version>
+		<mybatis-spring.version>1.2.2</mybatis-spring.version>
+		<mybatis.version>3.2.8</mybatis.version>
+
+		<groovy-all.version>2.4.5</groovy-all.version>
+		<mail.version>1.4.6</mail.version>
+		<quartz.version>2.3.0</quartz.version>
+
+		<spring-boot.version>1.5.6.RELEASE</spring-boot.version>
+	</properties>
+
 	<build>
 		<plugins>
 			<plugin>

xxl-job-admin/pom.xml

 	<artifactId>xxl-job-admin</artifactId>
 	<packaging>war</packaging>
 
-	<properties>
-		<spring.version>3.2.18.RELEASE</spring.version>
-	</properties>
-
 	<dependencies>
 		<!-- springframe start -->
 		<dependency>
 		<dependency>
 			<groupId>org.aspectj</groupId>
 			<artifactId>aspectjweaver</artifactId>
-			<version>1.8.7</version>
+			<version>${aspectjweaver.version}</version>
 		</dependency>
 		<!-- jackson (support spring json) -->
 		<dependency>
 			<groupId>org.codehaus.jackson</groupId>
 			<artifactId>jackson-mapper-asl</artifactId>
-			<version>1.9.13</version>
+			<version>${jackson-mapper-asl.version}</version>
 		</dependency>
 
 		<!-- slf4j -->
 		<dependency>
 			<groupId>org.slf4j</groupId>
 			<artifactId>slf4j-log4j12</artifactId>
-			<version>1.7.25</version>
+			<version>${slf4j-api.version}</version>
 		</dependency>
 
 		<!-- freemarker -->
 		<dependency>
 			<groupId>org.freemarker</groupId>
 			<artifactId>freemarker</artifactId>
-			<version>2.3.20</version>
+			<version>${freemarker.version}</version>
 		</dependency>
 
 		<!-- commons-beanutils -->
 		<dependency>
 			<groupId>commons-beanutils</groupId>
 			<artifactId>commons-beanutils</artifactId>
-			<version>1.9.2</version>
+			<version>${commons-beanutils.version}</version>
 		</dependency>
 		<!-- commons-lang -->
 		<dependency>
 			<groupId>commons-lang</groupId>
 			<artifactId>commons-lang</artifactId>
-			<version>2.6</version>
+			<version>${commons-lang.version}</version>
 		</dependency>
 
 		<!-- servlet -->
 		<dependency>
 			<groupId>javax.servlet</groupId>
 			<artifactId>javax.servlet-api</artifactId>
-			<version>3.0.1</version>
+			<version>${javax.servlet-api.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>javax.servlet.jsp</groupId>
 			<artifactId>jsp-api</artifactId>
-			<version>2.2</version>
+			<version>${jsp-api.version}</version>
 		</dependency>
 
 		<!-- junit -->
 		<dependency>
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
-			<version>4.11</version>
+			<version>${junit.version}</version>
 			<scope>test</scope>
 		</dependency>
 
 		<dependency>
 			<groupId>com.mchange</groupId>
 			<artifactId>c3p0</artifactId>
-			<version>0.9.5.2</version>
+			<version>${c3p0.version}</version>
+		</dependency>
+		<!-- mysql-connector -->
+		<dependency>
+			<groupId>mysql</groupId>
+			<artifactId>mysql-connector-java</artifactId>
+			<version>${mysql-connector-java.version}</version>
 		</dependency>
 		<!-- mybatis-spring -->
 		<dependency>
 			<groupId>org.mybatis</groupId>
 			<artifactId>mybatis-spring</artifactId>
-			<version>1.2.2</version>
+			<version>${mybatis-spring.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>org.mybatis</groupId>
 			<artifactId>mybatis</artifactId>
-			<version>3.2.8</version>
-		</dependency>
-		<!-- mysql-connector -->
-		<dependency>
-			<groupId>mysql</groupId>
-			<artifactId>mysql-connector-java</artifactId>
-			<version>5.1.29</version>
+			<version>${mybatis.version}</version>
 		</dependency>
 
+
 		<!-- httpclient -->
 		<dependency>
 			<groupId>org.apache.httpcomponents</groupId>
 			<artifactId>httpclient</artifactId>
-			<version>4.3.6</version>
+			<version>${httpclient.version}</version>
 		</dependency>
 
 		<!-- javax.mail -->
 		<dependency>
 			<groupId>javax.mail</groupId>
 			<artifactId>mail</artifactId>
-			<version>1.4.6</version>
+			<version>${mail.version}</version>
 		</dependency>
 
 		<!-- quartz ：quartz-2.2.3/c3p0-0.9.1.1/slf4j-api-1.6.6 -->
 		<dependency>
 			<groupId>org.quartz-scheduler</groupId>
 			<artifactId>quartz</artifactId>
-			<version>2.3.0</version>
+			<version>${quartz.version}</version>
 		</dependency>
 
 		<!-- xxl-job-core -->

xxl-job-core/pom.xml

 	<description>A lightweight distributed task scheduling framework.</description>
 	<url>http://www.xuxueli.com/</url>
 
-	<properties>
-		<spring.version>3.2.18.RELEASE</spring.version>
-	</properties>
-
 	<dependencies>
 		<!-- servlet -->
 		<dependency>
 			<groupId>javax.servlet</groupId>
 			<artifactId>javax.servlet-api</artifactId>
-			<version>3.0.1</version>
+			<version>${javax.servlet-api.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>javax.servlet.jsp</groupId>
 			<artifactId>jsp-api</artifactId>
-			<version>2.2</version>
+			<version>${jsp-api.version}</version>
 		</dependency>
 
 		<!-- jetty -->
 		<dependency>
 			<groupId>org.eclipse.jetty</groupId>
 			<artifactId>jetty-server</artifactId>
-			<version>9.2.22.v20170606</version>
+			<version>${jetty-server.version}</version>
 		</dependency>
 
 		<!-- slf4j -->
 		<dependency>
 			<groupId>org.slf4j</groupId>
 			<artifactId>slf4j-api</artifactId>
-			<version>1.7.25</version>
+			<version>${slf4j-api.version}</version>
 		</dependency>
 
 		<!-- hessian -->
 		<dependency>
 			<groupId>com.caucho</groupId>
 			<artifactId>hessian</artifactId>
-			<version>4.0.38</version>
+			<version>${hessian.version}</version>
 		</dependency>
 
 		<!-- jackson -->
 		<dependency>
 			<groupId>org.codehaus.jackson</groupId>
 			<artifactId>jackson-mapper-asl</artifactId>
-			<version>1.9.13</version>
+			<version>${jackson-mapper-asl.version}</version>
 		</dependency>
 		
 		<!-- httpclient -->
 		<dependency>
 			<groupId>org.apache.httpcomponents</groupId>
 			<artifactId>httpclient</artifactId>
-			<version>4.3.6</version>
+			<version>${httpclient.version}</version>
 		</dependency>
 		
 		<!-- spring-context -->
 		<dependency>
 			<groupId>org.codehaus.groovy</groupId>
 			<artifactId>groovy-all</artifactId>
-			<version>2.4.5</version>
+			<version>${groovy-all.version}</version>
 		</dependency>
 
 		<!-- commons-exec -->
 		<dependency>
 			<groupId>org.apache.commons</groupId>
 			<artifactId>commons-exec</artifactId>
-			<version>1.3</version>
+			<version>${commons-exec.version}</version>
 		</dependency>
 
 	</dependencies>

xxl-job-executor-example/pom.xml

 	<description>Executor project for spring boot.</description>
 	<url>http://www.xuxueli.com/</url>
 
-	<properties>
-		<spring.version>3.2.18.RELEASE</spring.version>
-	</properties>
-
 	<dependencies>
-
 		<!-- spring-webmvc -->
 		<dependency>
 			<groupId>org.springframework</groupId>
 		<dependency>
 			<groupId>org.slf4j</groupId>
 			<artifactId>slf4j-log4j12</artifactId>
-			<version>1.7.25</version>
+			<version>${slf4j-api.version}</version>
 		</dependency>
 		
 		<!-- xxl-job-core -->
 			<artifactId>xxl-job-core</artifactId>
 			<version>${project.parent.version}</version>
 		</dependency>
-		
 	</dependencies>
 
 </project>

xxl-job-executor-springboot-example/pom.xml

     <url>http://www.xuxueli.com/</url>
 
     <properties>
-        <spring-boot.version>1.5.6.RELEASE</spring-boot.version>
-
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <java.version>1.7</java.version>
-
-        <jetty.version>9.2.22.v20170606</jetty.version>
     </properties>
 
     <dependencyManagement>
             <dependency>
                 <groupId>org.eclipse.jetty</groupId>
                 <artifactId>jetty-server</artifactId>
-                <version>${jetty.version}</version>
+                <version>${jetty-server.version}</version>
             </dependency>
             <dependency>
                 <groupId>org.eclipse.jetty</groupId>
                 <artifactId>jetty-util</artifactId>
-                <version>${jetty.version}</version>
+                <version>${jetty-server.version}</version>
             </dependency>
             <dependency>
                 <groupId>org.eclipse.jetty</groupId>
                 <artifactId>jetty-http</artifactId>
-                <version>${jetty.version}</version>
+                <version>${jetty-server.version}</version>
             </dependency>
             <dependency>
                 <groupId>org.eclipse.jetty</groupId>
                 <artifactId>jetty-io</artifactId>
-                <version>${jetty.version}</version>
+                <version>${jetty-server.version}</version>
             </dependency>
 
         </dependencies>