hadoop的hdfs文件操作 hadoop的hdfs文件操作实现上传文件到hdfs

时间:2021-03-19 人气:0

想了解hadoop的hdfs文件操作实现上传文件到hdfs的相关内容吗，在本文为您仔细讲解hadoop的hdfs文件操作的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：hadoop的hdfs，下面大家一起来学习吧。

hdfs文件操作操作示例，包括上传文件到HDFS上、从HDFS上下载文件和删除HDFS上的文件，大家参考使用吧

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.*;

import java.io.File;
import java.io.IOException;
public class HadoopFile {
private Configuration conf =null;

    public HadoopFile(){
        conf =new Configuration();
        conf.addResource(new Path("/hadoop/etc/hadoop/core-site.xml"));
    }

    public HadoopFile(Configuration conf){
        this.conf =conf;
    }

    public boolean sendFile(String path,String localfile){
        File file=new File(localfile);
        if (!file.isFile()) {
            System.out.println(file.getName());
            return false;
        }
        try {
            FileSystem localFS =FileSystem.getLocal(conf);
            FileSystem hadoopFS =FileSystem.get(conf);
            Path hadPath=new Path(path);

            FSDataOutputStream fsOut=hadoopFS.create(new Path(path+"/"+file.getName()));
            FSDataInputStream fsIn=localFS.open(new Path(localfile));
            byte[] buf =new byte[1024];
            int readbytes=0;
            while ((readbytes=fsIn.read(buf))>0){
                fsOut.write(buf,0,readbytes);
            }
            fsIn.close();
            fsOut.close();

            FileStatus[] hadfiles= hadoopFS.listStatus(hadPath);
            for(FileStatus fs :hadfiles){
                System.out.println(fs.toString());
            }
            return true;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }

public boolean delFile(String hadfile){
try {

            FileSystem hadoopFS =FileSystem.get(conf);
            Path hadPath=new Path(hadfile);
            Path p=hadPath.getParent();
            boolean rtnval= hadoopFS.delete(hadPath, true);

            FileStatus[] hadfiles= hadoopFS.listStatus(p);
            for(FileStatus fs :hadfiles){
                System.out.println(fs.toString());
            }
            return rtnval;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }

public boolean downloadFile(String hadfile,String localPath){

        try {
            FileSystem localFS =FileSystem.getLocal(conf);
            FileSystem hadoopFS =FileSystem.get(conf);
            Path hadPath=new Path(hadfile);

            FSDataOutputStream fsOut=localFS.create(new Path(localPath+"/"+hadPath.getName()));
            FSDataInputStream fsIn=hadoopFS.open(hadPath);
            byte[] buf =new byte[1024];
            int readbytes=0;
            while ((readbytes=fsIn.read(buf))>0){
                fsOut.write(buf,0,readbytes);
            }
            fsIn.close();
            fsOut.close();

            return true;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }
}

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