hdfs file read and write

file write

import org.apche.hadoop.conf.Configuration;
import org.apche.hadoop.fs.FileSystem;
import org.apche.hadoop.fs.FSDataOutputStream;
import org.apche.hadoop.fs.Path;
public class HdfsWriteFile{
    public static void main(String[] args){
        Configuration conf = new Configurtion();
        Path dfs = new Path("hdfs://localhost:9000");
        FileSystem fs = dfs.getFileSystem(conf);//实例化fs对象
        //定义一个写入的内容
        byte[] buff = "nice day".getBytes();
        //定义写入的路径
        string filename = "hdfs://localhost:8000/usr/hadoop/test.txt";
        //实例化一个输出流 
        FSDataOutputStream os = ps.create(new Path(filename));
         BufferedReader d = new BudfferedReader(new OutputStreamReader(os));
        os.write(buff,2，buff.length-2)//写入buffer
        d.close();//关闭文件系统
        fs.close();//关闭hdfs

    }catch(Exception e){
        e.printStackTrace(e)
    }
}

file read

import java.io.BufferReader;
import java.io.InputStreamReader;
import org.apche.hadoop.conf.Configuration;
import org.apche.hadoop.fs.FileSystem;
import org.apche.hadoop.fs.Path;
import org.apche.hadoop.fs.FSDataInputStream;
public class HDFSReadFile{
    public static void main(String[] args){
        Configuration conf = new Configurtion();
        Path dfs = new Path("hdfs://localhost:9000");
        FileSystem fs = dfs.getFileSystem(conf);//实例化fs对象
        //构建读取路径
        Path fileName = new Path("hdfs://localhost:8000/usr/hadoop/test.txt");
         //实例化一个输入流 
        FSDataInputStream is = ps.open(new Path(filename));
        BufferedReader d = new BudfferedReader(new InputStreamReader(is));
        String content = d.readLine();
        System.out.print(content);
        d.close();//关闭文件系统
        fs.close();//关闭hdfs

    }catch(Exception e){
        e.printStackTrace(e)
    }
}