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This article introduces you how to operate HDFS in Java, the content is very detailed, interested friends can refer to, hope to be helpful to you.

Here is the code:

Package hdfs;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.net.URI;import java.net.URISyntaxException;import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.fs.FSDataInputStream;import org.apache.hadoop.fs.FSDataOutputStream;import org.apache.hadoop.fs.FileSystem;import org.apache.hadoop.fs.Path;import org.apache.hadoop.io.IOUtils Public class App2 {/ * * create method shortcuts using FileSystem * * eclipse: alt+shift+M * eclipse create local variable shortcuts alt+shift+L * / public static final String HDFS_PATH = "hdfs://192.168.9.204:9000"; private static final String DIR_PATH = "/ user/yinkaipeng" Private static final String FILE_PATH = "/ test"; public static void main (String [] args) throws Exception, URISyntaxException {FileSystem fileSystem = FileSystem.get (new URI (HDFS_PATH), new Configuration ()); / / create a folder CreatePackage (fileSystem); / / upload files / / UploadFile (fileSystem) / / download file / / Download (fileSystem); / / delete file / / deleteFile (fileSystem);} private static void deleteFile (FileSystem fileSystem) throws IOException {fileSystem.delete (new Path (FILE_PATH), true); System.out .println ("OK!") } private static void UploadFile (FileSystem fileSystem) throws IOException, FileNotFoundException {final FSDataOutputStream out = fileSystem.create (new Path (FILE_PATH)); final FileInputStream in = new FileInputStream ("c:/log.txt"); IOUtils.copyBytes (in, out, 1024, true) } private static void CreatePackage (FileSystem fileSystem) throws IOException {fileSystem.mkdirs (new Path (DIR_PATH));} private static void Download (FileSystem fileSystem) throws IOException {final FSDataInputStream in2 = fileSystem.open (new Path (FILE_PATH)); IOUtils.copyBytes (in2, System.out, 1024, true) }} this is the end of sharing about how to operate HDFS in Java. I hope the above content can help you to some extent and learn more knowledge. If you think the article is good, you can share it for more people to see.

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