本篇博文给大家介绍的是进行JavaAPI操作前的准备工作
个人可根据自己电脑的操作系统下载对应的hadoop.jar包到非中文路径
所用jar包的连接如下: 链接:https://pan.baidu.com/s/1krbLrnejfXSsLppauxrCTg 提取码:jbsr
博主路径为:D:\hadoop\hadoop-2.7.2
输入:winutils
如果出现上述界面,即代表成功,否则为失败
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>RELEASE</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.8.2</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-common</artifactId>
<version>2.7.2</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-client</artifactId>
<version>2.7.2</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-hdfs</artifactId>
<version>2.7.2</version>
</dependency>
<dependency>
<groupId>jdk.tools</groupId>
<artifactId>jdk.tools</artifactId>
<version>1.8</version>
<scope>system</scope>
<systemPath>D:/java/jdk-1.8.0/lib/tools.jar</systemPath>
</dependency>
</dependencies>
1.log4j:WARN No appenders could be found for logger (org.apache.hadoop.util.Shell).
2.log4j:WARN Please initialize the log4j system properly.
3.log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
需要在项目的src/main/resources目录下,新建一个文件,命名为“log4j.properties”,在文件中填入
log4j.rootLogger=INFO, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n
log4j.appender.logfile=org.apache.log4j.FileAppender
log4j.appender.logfile.File=target/spring.log
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n
package com.buwenbuhuo.hdfs;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.junit.Test;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
/**
* @author buwenbuhuo
* @create 2020-04-22 16:45
* com.buwenbuhuo.hdfs - the name of the target package where the new class or interface will be created.
* hdfs0422 - the name of the current project.
*/
public class HDFSClient {
@Test
public void testMkdirs() throws IOException, InterruptedException, URISyntaxException {
// 1 获取文件系统
Configuration configuration = new Configuration();
// 配置在集群上运行
FileSystem fs = FileSystem.get(URI.create("hdfs://hadoop001:9000"), configuration, "bigdata");
// 2 创建目录
fs.mkdirs(new Path("/0422/buwenbuhuo/test"));
// 3 关闭资源
fs.close();
}
}
在集群上查看是否成功
本篇博文到这里就结束了,小伙伴们有什么疑惑或好的建议可以积极在评论区留言,博主会在后续继续推出HDFS系列的其他内容,希望大家持续关注博主~~