hadoop程序抛出异常：java.lang.IllegalArgumentException: Wrong FS: hdfs:/ expected file:///

package cn.ytu.hdfsrwfile;

import java.util.ArrayList;
import java.util.List;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
/**
 * 非mapreduce过程在HDFS上读文件
 * @author LiuYinxing
 *
 */
public class ReadHDFSfile {
	/**
	 * 非mapreduce过程在HDFS上读取文件
	 * @param path  文件路径
	 * @return 内容
	 * @throws Exception
	 */
	@SuppressWarnings("deprecation")
	public List<String> getData(String path) throws Exception{
		Configuration conf = new Configuration();
		FileSystem hdfs = FileSystem.get(conf);
		Path inPath  = new Path(path);
		FSDataInputStream dis = hdfs.open(inPath);
	    String s = null;
	    s = dis.readLine();
	    String[] strings = s.split(",");
	    List<String> attributesvalue = new ArrayList<>();
	    for (int i = 0; i < strings.length; i++) {
			attributesvalue.add(strings[i]);
		}
	    return attributesvalue;
	}
}

package cn.ytu.hdfsrwfile;

import java.io.FileNotFoundException;
import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
/**
 * 非mapreduce过程在HDFS上写文件
 * @author LiuYinxing
 *
 */
public class WriteHDFSfile {
	/**
	 * 非mapreduce过程在HDFS上写文件
	 * @param path
	 * @throws FileNotFoundException
	 * @throws IOException
	 */
  public void writehdfsdata(String path) throws FileNotFoundException, IOException
  {
	    String string = "hello world i love you";
		Configuration conf = new Configuration();
		FileSystem hdfs = FileSystem.get(conf);
		Path inPath  = new Path(path);
		FSDataOutputStream dos = hdfs.create(inPath);
		dos.writeBytes(string);
		dos.close();
	}

}

package cn.ytu.hdfsrwfile;

public class HRWmain {

	public static void main(String[] args) throws Exception {
		// TODO Auto-generated method stub
		
		String path = "hdfs://localhost:9000/user/hadoop/output/helloworld.txt";
		
		WriteHDFSfile writeHDFSfile = new WriteHDFSfile();
		writeHDFSfile.writehdfsdata(path);
		
		ReadHDFSfile readHDFSfile = new ReadHDFSfile();
		for (String string : readHDFSfile.getData(path)) {
			System.out.print(string+" ");
		}
		System.out.println();
	}

}

运行结果如下：

注意如果在eclipse上运行出现如下异常：

请参考上篇博客：

hadoop程序抛出异常：java.lang.IllegalArgumentException: Wrong FS: hdfs:/ expected file:///