Hadoop基础教程-第4章 HDFS的Java API（4.3 pom.xml解析）

第4章 HDFS的Java API

4.3 pom.xml解析

4.3.1 Maven库

https://mvnrepository.com/

4.3.2 添加Hadoop的依赖

在pom.xml文件里添加hadoop的依赖包hadoop-common, hadoop-client, hadoop-hdfs
在搜索框中输入hadoop-common，单击“Search”按钮

单击“Apache Hadoop Common”链接，选择2.7.3版，复制对应Maven代码，粘贴到pom.xml文件中。

类似地搜索hadoop-client和hadoop-hdfs的Maven依赖包代码，最后得到的pom.xml文件如下：

<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>4.0.0</modelVersion>

<groupId>cn.hadron</groupId>
<artifactId>hdfsDemo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>hdfsDemo</name>
<url>http://maven.apache.org</url>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>

<!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-common -->
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-common</artifactId>
<version>2.7.3</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-hdfs -->
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-hdfs</artifactId>
<version>2.7.3</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-client -->
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-client</artifactId>
<version>2.7.3</version>
</dependency>

<dependency>
<groupId>jdk.tools</groupId>
<artifactId>jdk.tools</artifactId>
<version>1.8</version>
<scope>system</scope>
<systemPath>${JAVA_HOME}/lib/tools.jar</systemPath>
</dependency>

</dependencies>
</project>

保存pom.xml文件后，Eclipse会自动下载相关依赖包，如果出现错误，请强制更新Maven即可（参加4.2节）

在项目的pom.xml文件中添加如下内容：

    <!-- 设定主仓库，按设定顺序进行查找。 -->
<repositories>

<repository>
<id>maven-aliyun</id>
<name>maven-aliyun</name>
<url>http://maven.aliyun.com/nexus/content/groups/public</url>
</repository>

</repositories>


<!-- 设定插件仓库 -->
<pluginRepositories>

<pluginRepository>
<id>maven-aliyun</id>
<name>maven-aliyun</name>
<url>http://maven.aliyun.com/nexus/content/groups/public</url>
</pluginRepository>

</pluginRepositories>