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這篇文章主要介紹如何使用JAVA API操作HDFS,文中介紹的非常詳細(xì),具有一定的參考價(jià)值,感興趣的小伙伴們一定要看完!
windows操作系統(tǒng)需要配置一下hadoop環(huán)境
mac本質(zhì)上是unix系統(tǒng),不需要配置
==參考文檔《Windows&Mac本地開(kāi)發(fā)環(huán)境配置》==
鏈接:https://pan.baidu.com/s/1tFJSlRxn18YELUUAUkXXQA
提取碼:g9ka
<properties>
<hadoop.version>3.1.4</hadoop.version>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-client</artifactId>
<version>${hadoop.version}</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-common</artifactId>
<version>${hadoop.version}</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-hdfs</artifactId>
<version>${hadoop.version}</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-mapreduce-client-core</artifactId>
<version>${hadoop.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/junit/junit -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<version>RELEASE</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.0</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
<!-- <verbal>true</verbal>-->
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.4.3</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<minimizeJar>true</minimizeJar>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
//簡(jiǎn)化版
@Test
public void mkDirOnHDFS() throws IOException {
//配置項(xiàng)
Configuration configuration = new Configuration();
//設(shè)置要連接的hdfs集群
configuration.set("fs.defaultFS", "hdfs://node01:8020");
//獲得文件系統(tǒng)
FileSystem fileSystem = FileSystem.get(configuration);
//調(diào)用方法創(chuàng)建目錄;若目錄已經(jīng)存在,則創(chuàng)建失敗,返回false
boolean mkdirs = fileSystem.mkdirs(new Path("/kaikeba/dir1"));
//釋放資源
fileSystem.close();
}
//指定目錄所屬用戶(hù)
@Test
public void mkDirOnHDFS2() throws IOException, URISyntaxException, InterruptedException {
//配置項(xiàng)
Configuration configuration = new Configuration();
//獲得文件系統(tǒng)
FileSystem fileSystem = FileSystem.get(new URI("hdfs://node01:8020"), configuration, "test");
//調(diào)用方法創(chuàng)建目錄
boolean mkdirs = fileSystem.mkdirs(new Path("/kaikeba/dir2"));
//釋放資源
fileSystem.close();
}
//創(chuàng)建目錄時(shí),指定目錄權(quán)限
@Test
public void mkDirOnHDFS3() throws IOException {
Configuration configuration = new Configuration();
configuration.set("fs.defaultFS", "hdfs://node01:8020");
FileSystem fileSystem = FileSystem.get(configuration);
FsPermission fsPermission = new FsPermission(FsAction.ALL, FsAction.READ, FsAction.READ);
boolean mkdirs = fileSystem.mkdirs(new Path("hdfs://node01:8020/kaikeba/dir3"), fsPermission);
if (mkdirs) {
System.out.println("目錄創(chuàng)建成功");
}
fileSystem.close();
}
注意:我們一定按照之前的環(huán)境搭建要求配置好了相應(yīng)的hadoop集群,相關(guān)host,并且hadoop啟動(dòng)成功的情況下才能正常運(yùn)行以上程序。
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