关于Maven的使用就不再啰嗦了，网上很多，并且这么多年变化也不大，这里仅介绍怎么搭建Hadoop的开发环境。

1. 首先创建工程

复制代码 代码如下:mvn archetype:generate -DgroupId=my.hadoopstudy -DartifactId=hadoopstudy -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

2. 然后在pom.xml文件里添加hadoop的依赖包hadoop-common, hadoop-client, hadoop-hdfs，添加后的pom.xml文件如下

<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <groupId>my.hadoopstudy</groupId>
 <artifactId>hadoopstudy</artifactId>
 <packaging>jar</packaging>
 <version>1.0-SNAPSHOT</version>
 <name>hadoopstudy</name>
 <url>http://maven.apache.org</url>

 <dependencies>
 <dependency>
  <groupId>org.apache.hadoop</groupId>
  <artifactId>hadoop-common</artifactId>
  <version>2.5.1</version>
 </dependency>
 <dependency>
  <groupId>org.apache.hadoop</groupId>
  <artifactId>hadoop-hdfs</artifactId>
  <version>2.5.1</version>
 </dependency>
 <dependency>
  <groupId>org.apache.hadoop</groupId>
  <artifactId>hadoop-client</artifactId>
  <version>2.5.1</version>
 </dependency>

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

3. 测试

3.1 首先我们可以测试一下hdfs的开发，这里假定使用上一篇Hadoop文章中的hadoop集群，类代码如下

package my.hadoopstudy.dfs;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;

import java.io.InputStream;
import java.net.URI;

public class Test {
 public static void main(String[] args) throws Exception {
 String uri = "hdfs://9.111.254.189:9000/";
 Configuration config = new Configuration();
 FileSystem fs = FileSystem.get(URI.create(uri), config);

 // 列出hdfs上/user/fkong/目录下的所有文件和目录
 FileStatus[] statuses = fs.listStatus(new Path("/user/fkong"));
 for (FileStatus status : statuses) {
  System.out.println(status);
 }

 // 在hdfs的/user/fkong目录下创建一个文件，并写入一行文本
 FSDataOutputStream os = fs.create(new Path("/user/fkong/test.log"));
 os.write("Hello World!".getBytes());
 os.flush();
 os.close();

 // 显示在hdfs的/user/fkong下指定文件的内容
 InputStream is = fs.open(new Path("/user/fkong/test.log"));
 IOUtils.copyBytes(is, System.out, 1024, true);
 }
}

3.2 测试MapReduce作业