hadoop环境配置好后，直接可以在window上进行调试。话不多说，直接上源码。
package cn.terry;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.net.URISyntaxException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;
import org.junit.Before;
import org.junit.Test;
public class hdfsdemo {
FileSystem fs=null;
@Before
public void init() throws IOException, InterruptedException, URISyntaxException
{
fs = FileSystem.get(new URI("hdfs://master:9000"), new Configuration(), "root");
}
//upload
@Test
public void upload() throws IllegalArgumentException, IOException
{
InputStream in= new FileInputStream("c:/ab.txt");
OutputStream out= fs.create(new Path("/ab.txt"));
IOUtils.copyBytes(in, out, 4096,true);
}
@Test
public void makeDirectory() throws IllegalArgumentException, IOException
{
boolean ret= fs.mkdirs(new Path("/code/a"));
System.out.print(ret);
}
@Test
public void testDelete() throws IOException
{
@SuppressWarnings("deprecation")
boolean ret= fs.delete(new Path("/code/a"),true);
System.out.print(ret);
}
/**
* @param args
* @throws URISyntaxException
* @throws IOException
*/
public static void main(String[] args) throws IOException, URISyntaxException {
// TODO Auto-generated method stub
//download
FileSystem fs=FileSystem.get(new URI("hdfs://master:9000"),new Configuration());
InputStream in= fs.open(new Path("/input/a.txt"));
OutputStream out =new FileOutputStream("c:/ab.txt");
IOUtils.copyBytes(in, out, 4096,true);
}
}
