maven解决传递依赖冲突解决

传递依赖：A(项目)依赖B,B依赖C(1.1版本)，B是A的直接依赖，C就是A的传递依赖
                              导入依赖D,D依赖C(1.2版本)

1.1 maven 自己调解原则
     1.1.1 第一声明者优先原则
             谁先定义的就用谁的传递依赖
     1.1.2 路径近者优先原则
             直接依赖级别高于传递依赖
1.2 排除依赖
     

	<dependencies>
		<dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-spring-plugin</artifactId>
			<version>2.5.10.1</version>
			<!-- 排除依赖 -->
			<exclusions>
				<exclusion>
					<groupId>org.springframework</groupId>
					<artifactId>spring-beans</artifactId>
				</exclusion>
				<exclusion>
					<groupId>org.springframework</groupId>
					<artifactId>spring-core</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>4.3.9.RELEASE</version>
		</dependency>
	</dependencies>
      

1.3 版本锁定
     

        <properties>
		<spring.version>4.3.9.RELEASE</spring.version>
	</properties>
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-beans</artifactId>
				<version>${spring.version}</version>
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-core</artifactId>
				<version>${spring.version}</version>
			</dependency>
		</dependencies>
	</dependencyManagement>