写HDFS文件

用java向hdfs中写文件

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

import java.io.*;
import java.net.URI;
import java.net.URISyntaxException;

public class testCreate {

    public static void main(String[] args) 
    	throws URISyntaxException, IOException, InterruptedException {
		
		FileSystem fileSystem=FileSystem.get(
        	new URI("hdfs://172.0.0.1:9000"), 
        	new Configuration(),"root"
        );
        try {
            OutputStream output = fileSystem.create(new Path("/user/test/a.txt"));
            //使用\t作为分隔符
            output.write("1\t1".getBytes("UTF-8"));
            
            output.write("\n".getBytes("UTF-8"));//换行
            output.flush()


            fileSystem.close();
            output.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

追加写入

Stream output = fileSystem.append(new Path("/user/test/a.txt"));