mvn pom文件引用顺序关系

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.</modelVersion>

    <groupId>com.sankuai.qcs</groupId>

    <artifactId>qcs-regulation-parent</artifactId>

    <version>1.2.7.1-SNAPSHOT</version>

    <packaging>pom</packaging>

    <parent>

        <groupId>com.meituan.mdp</groupId>

        <artifactId>mdp-parent</artifactId>

        <version>1.2.</version>

    </parent>

    <scm>

        <url>http://git.sankuai.com/scm/qcs/qcs-regulation-core</url>

        <developerConnection>scm:git:http://git.sankuai.com/scm/qcs/qcs-regulation-core.git</developerConnection>

        <connection>scm:git:http://git.sankuai.com/scm/qcs/qcs-regulation-core.git</connection>

        <tag>v1.2.0</tag>

    </scm>

    <distributionManagement>

        <repository>

            <id>meituan-nexus-releases</id>

            <name>Repository for releases artifacts</name>

            <url>http://pixel.sankuai.com/repository/releases</url>

        </repository>

        <snapshotRepository>

            <id>meituan-nexus-snapshots</id>

            <name>Repository for snapshots artifacts</name>

            <url>http://pixel.sankuai.com/repository/snapshots</url>

        </snapshotRepository>

    </distributionManagement>

    <properties>

        <project.build.sourceEncoding>UTF-</project.build.sourceEncoding>

        <java.version>1.8</java.version>

        <project.build.sourceEncoding>UTF-</project.build.sourceEncoding>

        <qcs-regulation-core.version>1.2.8.1-SNAPSHOT</qcs-regulation-core.version>

    </properties>

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.apache.commons</groupId>

                <artifactId>commons-pool2</artifactId>

                <version>2.6.</version>

            </dependency>

            <dependency>

                <groupId>com.alibaba</groupId>

                <artifactId>fastjson</artifactId>

                <version>1.2.</version>

            </dependency>

        </dependencies>

    </dependencyManagement>

    <dependencies>

        <dependency>

            <groupId>com.meituan.mdp.boot</groupId>

            <artifactId>mdp-boot-starter-mafka</artifactId>

        </dependency>

        <dependency>

            <groupId>com.meituan.mdp.boot</groupId>

            <artifactId>mdp-boot-starter-log</artifactId>

        </dependency>

        <dependency>

            <groupId>com.meituan.mdp.boot</groupId>

            <artifactId>mdp-boot-starter-config</artifactId>

        </dependency>

        <dependency>

            <groupId>com.meituan.mdp.boot</groupId>

            <artifactId>mdp-boot-starter-web</artifactId>

            <exclusions>

            <exclusion>

                <groupId>com.alibaba</groupId>

                <artifactId>fastjson</artifactId>

            </exclusion>

            </exclusions>

        </dependency>

        <dependency>

            <groupId>com.meituan.mdp.boot</groupId>

            <artifactId>mdp-boot-starter-squirrel</artifactId>

        </dependency>

        <dependency>

            <groupId>com.meituan.mdp.component</groupId>

            <artifactId>swagger-analysis-core</artifactId>

            <exclusions>

                <exclusion>

                    <groupId>org.slf4j</groupId>

                    <artifactId>slf4j-ext</artifactId>

                </exclusion>

            </exclusions>

        </dependency>

        <dependency>

            <groupId>com.sankuai.qcs</groupId>

            <artifactId>qcs-regulation-core</artifactId>

            <version>${qcs-regulation-core.version}</version>

            <exclusions>

                <exclusion>

                    <groupId>com.meituan.mafka</groupId>

                    <artifactId>mafka-client_2.</artifactId>

                </exclusion>

                <exclusion>

                    <groupId>com.sankuai.meituan</groupId>

                    <artifactId>mtconfig-client</artifactId>

                </exclusion>

                <exclusion>

                    <groupId>com.meituan.log</groupId>

                    <artifactId>scribe-log4j2</artifactId>

                </exclusion>

                <exclusion>

                    <groupId>com.meituan.inf</groupId>

                    <artifactId>xmd-log4j2</artifactId>

                </exclusion>

                <exclusion>

                    <groupId>org.apache.commons</groupId>

                    <artifactId>commons-pool2</artifactId>

                </exclusion>

                <exclusion>

                    <groupId>com.jcraft</groupId>

                    <artifactId>jsch</artifactId>

                </exclusion>

                <exclusion>

                    <groupId>com.google.protobuf</groupId>

                    <artifactId>protobuf-java</artifactId>

                </exclusion>

            </exclusions>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-compiler-plugin</artifactId>

                <version>3.8.</version>

                <configuration>

                    <encoding>${project.build.sourceEncoding}</encoding>

                    <source>${java.version}</source>

                    <target>${java.version}</target>

                    <debug>true</debug>

                </configuration>

            </plugin>

            <!--mvn release 版本号-->

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-release-plugin</artifactId>

                <version>2.5.</version>

                <configuration>

                    <tagNameFormat>v@{project.version}</tagNameFormat>

                    <autoVersionSubmodules>true</autoVersionSubmodules>

                </configuration>

            </plugin>

        </plugins>

    </build>

</project>

如上代码：

首先系统要先从

（1） <dependencies> 强制引用

（2）</dependencyManagement> 强制引用

（3）然后是 <parent> 里面强制引用找；

(4)如果实在是没有了，就从 dependencies 的间接引用找；

比如在 dependency 里面有：

<dependency>

            <groupId>com.sankuai.qcs</groupId>

            <artifactId>qcs-regulation-core</artifactId>

            <version>${qcs-regulation-core.version}</version>

         </dependency>

而：

core里面有：

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>${fastjson.version}</version>
</dependency>
那么 fastjson 属于间接引用；会在第四部执行；

如果我想要制定fastjson的版本直接在dependencyManagement里面指定：

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.apache.commons</groupId>

                <artifactId>commons-pool2</artifactId>

                <version>2.6.</version>

            </dependency>

            <dependency>

                <groupId>com.alibaba</groupId>

                <artifactId>fastjson</artifactId>

                <version>1.2.</version>

            </dependency>

        </dependencies>

    </dependencyManagement>

这样，dependency里面所有的有引用 fastjson 的地方全部变成了：1.2.58

巴特西

mvn pom文件引用顺序关系

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