code: public static void copyToHDFS(String localFile, String hdfsFile) throws IOException {
  
      String hadoopConfPath; 
  
      if (Environment.getProperty("hadoop.conf.path") == null)
        hadoopConfPath = "../../../conf";
      else
        hadoopConfPath = Environment.getProperty("hadoop.conf.path");
  
      // Read the configuration for the Hadoop environment
      Configuration hadoopConf = new Configuration();
      hadoopConf.addResource(new Path(hadoopConfPath + "/hadoop-default.xml"));
      hadoopConf.addResource(new Path(hadoopConfPath + "/hadoop-site.xml"));
  
      // System.out.println(hadoopConf.get("hadoop.tmp.dir"));
      // System.out.println(hadoopConf.get("fs.default.name"));
      FileSystem fs = FileSystem.get(hadoopConf);
  
      // HadoopDFS deals with Path
      Path inFile = new Path("file://" + localFile);
      Path outFile = new Path(hadoopConf.get("fs.default.name") + hdfsFile);
  
       // Read from and write to new file
      Environment.logInfo("Uploading to HDFS (file " + outFile + ") ...");
      fs.copyFromLocalFile(false, inFile, outFile);
    }
docs: Copy a local file to HDFS
  
  @param localFile the filename of the local file
  @param hdfsFile the HDFS filename to copy to