使用Java API从虚拟机hdfs文件系统下载文件出现的问题

代码如下：
package com.monkey1024;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

import java.io.IOException;
import java.net.URI;

public class GetFile {
public static void main(String[] args) throws IOException {
String hdfspath=“hdfs://192.168.59.1:9000/user/root/input/words.txt”;
String localpath=“E:/copy_words.txt”;
Configuration conf = new Configuration();
FileSystem fs = FileSystem.get(URI.create(hdfspath), conf);
Path hdfs_path = new Path(hdfspath);
Path local_path = new Path(localpath);
fs.copyToLocalFile(hdfs_path,local_path);
fs.close();
}
}

执行后出现如下错误：
java.io.IOException: (null) entry in command string: null chmod 0644

解决方法：
1.下载hadoop.dll文件

2.并拷贝到c:\windows\system32目录中

3.重新运行代码程序即可