1.PC已经安装Eclipse Software,测试平台windows10及Centos6.8虚拟机
2.新建maven project
3.打开pom.xml,maven工程项目的pom文件加载以下内容
1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 2 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 3 <modelVersion>4.0.0</modelVersion> 4 <groupId>com.neusoft</groupId> 5 <artifactId>bigdata001</artifactId> 6 <version>0.0.1-SNAPSHOT</version> 7 <name>bigdata001</name> 8 <dependencies> 9 <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-common --> 10 <dependency> 11 <groupId>org.apache.hadoop</groupId> 12 <artifactId>hadoop-common</artifactId> 13 <version>2.6.0</version> 14 </dependency> 15 <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-hdfs --> 16 <dependency> 17 <groupId>org.apache.hadoop</groupId> 18 <artifactId>hadoop-hdfs</artifactId> 19 <version>2.6.0</version> 20 </dependency> 21 <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-client --> 22 <dependency> 23 <groupId>org.apache.hadoop</groupId> 24 <artifactId>hadoop-client</artifactId> 25 <version>2.6.0</version> 26 </dependency> 27 <dependency> 28 <groupId>jdk.tools</groupId> 29 <artifactId>jdk.tools</artifactId> 30 <version>1.7</version> 31 <scope>system</scope> 32 <systemPath>${JAVA_HOME}/lib/tools.jar</systemPath> 33 </dependency> 34 <!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper --> 35 <dependency> 36 <groupId>org.apache.zookeeper</groupId> 37 <artifactId>zookeeper</artifactId> 38 <version>3.4.6</version> 39 </dependency> 40 41 42 </dependencies> 43 44 <build> 45 <plugins> 46 <plugin> 47 <groupId>org.apache.maven.plugins</groupId> 48 <artifactId>maven-compiler-plugin</artifactId> 49 <version>2.3.2</version> 50 <configuration> 51 <encoding>UTF-8</encoding> 52 <source>1.7</source> 53 <target>1.7</target> 54 <showWarning>true</showWarning> 55 </configuration> 56 </plugin> 57 </plugins> 58 </build> 59 </project>
pom.xml
4.如下图所示,下一步在src/main/java/下新建hdfs包,并新建java class:FileSystemTest.java
5.FileSystemTest.java代码内容如下:
1 package Hdfs; 2 3 import java.net.URI; 4 import org.apache.hadoop.conf.Configuration; 5 import org.apache.hadoop.fs.FileStatus; 6 import org.apache.hadoop.fs.FileSystem; 7 import org.apache.hadoop.fs.Path; 8 9 public class FileSystemTest { 10 public static void main(String[] args) throws Exception { 11 FileSystem fileSystem = FileSystem.newInstance(new URI("hdfs://neusoft-master:9000"), new Configuration()); 12 FileStatus[] listStatus = fileSystem.listStatus(new Path("/")); 13 for (FileStatus fileStatus : listStatus) { 14 System.out.println(fileStatus); 15 } 16 } 17 }
6.运行结果如下所示
log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. FileStatus{path=hdfs://neusoft-master:9000/hbase; isDirectory=true; modification_time=1483712306703; access_time=0; owner=root; group=supergroup; permission=rwxr-xr-x; isSymlink=false} FileStatus{path=hdfs://neusoft-master:9000/tmp; isDirectory=true; modification_time=1483709831059; access_time=0; owner=root; group=supergroup; permission=rwx------; isSymlink=false} FileStatus{path=hdfs://neusoft-master:9000/user; isDirectory=true; modification_time=1483709981792; access_time=0; owner=root; group=supergroup; permission=rwxr-xr-x; isSymlink=false}
Console view
运行java类可以显示hadoop的HDFS文件系统下面各个目录。
7.在VM虚拟机搭建的Hadoop伪分布式环境进行测试。
8.总结
上述步骤总结了如何通过在Windows平台的Eclipse平台下通过编码实现查看,hdfs文件系统内容。
备注:编程时:用到了hdfs://neusoft-master:9000的neusoft-master需要在windows及linux平台进行设置
windows系统需要在C:/Windows/System32/drivers/etc以管理员打开并添加“192.168.191.130 NEUSOFT-MASTER”
Linux系统需要修改主机名(vi /etc/sysconfig/network修改hostname)及修改vi /etc/hosts对应的ip和host
原创文章,作者:ItWorker,如若转载,请注明出处:https://blog.ytso.com/tech/bigdata/8930.html