hadoop的读写操作

在txt文件中写点需要上传的数据，conf是source包，lib是jar包

package com.wangbo.day0830;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.FileReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.fs.FSDataInputStream;import org.apache.hadoop.fs.FSDataOutputStream;import org.apache.hadoop.fs.FileSystem;import org.apache.hadoop.fs.Path;/** * hdfs操作类 * @author Administrator * */public class HdfsTest {    /**     * @param args     * @throws IOException      */    public static void main(String[] args) throws IOException {        //创建hdfs的配置        Configuration conf = new Configuration();        //加载配置文件        conf.addResource("conf/core-site.xml");        conf.addResource("conf/hdfs-site.xml");        //获取HDFS的句柄        FileSystem fs = FileSystem.get(conf);//      //向HDFS写入数据//      writeHDFS(fs);        //向HDFS读数据        readHDFS(fs);    }    private static void readHDFS(FileSystem fs) throws IllegalArgumentException, IOException {        //获取文件输入流        FSDataInputStream in = fs.open(new Path("syhz/hellohadoop.txt"));        byte[] buff = new byte[1024];        BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(new File("d:/hdfs.txt")));//      写入文件 字节流        int length = in.read(buff);        while(-1 != length)        {//          System.out.println(new String(buff, 0, length));            out.write(buff, 0, length);            length = in.read(buff);        }        in.close();        out.close();        System.out.println("读取结束!");    }    public static void writeHDFS(FileSystem fs) throws IOException    {        //在HDFS上新建一个虚拟目录        Path path = new Path("syhz/hellohadoop.txt");        //输出流        FSDataOutputStream out = fs.create(path);        //读取数据写入数据 字节流//      BufferedInputStream bufferIn = new BufferedInputStream(new FileInputStream(new File("text.txt")));//      byte[] buff = new byte[1024];//      int length = bufferIn.read(buff);//      //      while(-1 != length)//      {//          //写入//          out.write(buff,0,length);//          out.flush();//          length = bufferIn.read(buff);//      }//      out.close();//      bufferIn.close();        //读取数据写入数据 字符流        BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(new File("text.txt")),"gbk"));        String line = null;        while((line = reader.readLine())!=null){            out.write((line+System.getProperty("line.separator")).getBytes("utf-8"));            out.flush();        }        out.close();        reader.close();    }}

就是酱紫