```java public class HadoopClient { public static void main(String[] args) throws Exception { Configuration conf = new Configuration(); conf.set("fs.defaultFS", "hdfs://hadoop1:9000"); System.setProperty("HADOOP_USER_NAME", "root"); // 以root身份访问 FileSystem fs = FileSystem.get(conf); fs.copyToLocalFile(false, new Path("/hosts"), new Path("C:\\Users\\Administrator\\Desktop\\"), true); fs.close(); } } ```