Hadoop HDFs file operation implementation upload file to Hdfs_java

HDFs file operation examples, including uploading files to HDFs, downloading files from HDFs, and deleting files on HDFs, refer to the use of

Copy Code code as follows:

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;
}
}