跟我学hadoop学习2

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;

public class DateRangePathFilter implements PathFilter {
  
  private final Pattern PATTERN = Pattern.compile("^.*/(\\d\\d\\d\\d/\\d\\d/\\d\\d).*$");
  
  private final Date start, end;

  public DateRangePathFilter(Date start, Date end) {
    this.start = new Date(start.getTime());
    this.end = new Date(end.getTime());
  }
  
  public boolean accept(Path path) {
    Matcher matcher = PATTERN.matcher(path.toString());
    if (matcher.matches()) {
      DateFormat format = new SimpleDateFormat("yyyy/MM/dd");
      try {
        return inInterval(format.parse(matcher.group(1)));
      } catch (ParseException e) {
        return false;
      }
    }
    return false;
  }

  private boolean inInterval(Date date) {
    return !date.before(start) && !date.after(end);
  }

}

// cc FileCopyWithProgress Copies a local file to a Hadoop filesystem, and shows progress
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.util.Progressable;

// vv FileCopyWithProgress
public class FileCopyWithProgress {
  public static void main(String[] args) throws Exception {
    String localSrc = args[0];
    String dst = args[1];
    
    InputStream in = new BufferedInputStream(new FileInputStream(localSrc));
    
    Configuration conf = new Configuration();
    FileSystem fs = FileSystem.get(URI.create(dst), conf);
    OutputStream out = fs.create(new Path(dst), new Progressable() {
      public void progress() {
        System.out.print(".");
      }
    });
    
    IOUtils.copyBytes(in, out, 4096, true);
  }
}
// ^^ FileCopyWithProgress



// cc FileSystemCat Displays files from a Hadoop filesystem on standard output by using the FileSystem directly
import java.io.InputStream;
import java.net.URI;

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

// vv FileSystemCat
public class FileSystemCat {

  public static void main(String[] args) throws Exception {
    String uri = args[0];
    Configuration conf = new Configuration();
    FileSystem fs = FileSystem.get(URI.create(uri), conf);
    InputStream in = null;
    try {
      in = fs.open(new Path(uri));
      IOUtils.copyBytes(in, System.out, 4096, false);
    } finally {
      IOUtils.closeStream(in);
    }
  }
}
// ^^ FileSystemCat


// cc FileSystemDoubleCat Displays files from a Hadoop filesystem on standard output twice, by using seek
import java.net.URI;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;

// vv FileSystemDoubleCat
public class FileSystemDoubleCat {

  public static void main(String[] args) throws Exception {
    String uri = args[0];
    Configuration conf = new Configuration();
    FileSystem fs = FileSystem.get(URI.create(uri), conf);
    FSDataInputStream in = null;
    try {
      in = fs.open(new Path(uri));
      IOUtils.copyBytes(in, System.out, 4096, false);
      in.seek(0); // go back to the start of the file
      IOUtils.copyBytes(in, System.out, 4096, false);
    } finally {
      IOUtils.closeStream(in);
    }
  }
}
// ^^ FileSystemDoubleCat


// cc ListStatus Shows the file statuses for a collection of paths in a Hadoop filesystem 
import java.net.URI;

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

// vv ListStatus
public class ListStatus {

  public static void main(String[] args) throws Exception {
    String uri = args[0];
    Configuration conf = new Configuration();
    FileSystem fs = FileSystem.get(URI.create(uri), conf);
    
    Path[] paths = new Path[args.length];
    for (int i = 0; i < paths.length; i++) {
      paths[i] = new Path(args[i]);
    }
    
    FileStatus[] status = fs.listStatus(paths);
    Path[] listedPaths = FileUtil.stat2Paths(status);
    for (Path p : listedPaths) {
      System.out.println(p);
    }
  }
}
// ^^ ListStatus


// cc RegexExcludePathFilter A PathFilter for excluding paths that match a regular expression
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;

// vv RegexExcludePathFilter
public class RegexExcludePathFilter implements PathFilter {
  
  private final String regex;

  public RegexExcludePathFilter(String regex) {
    this.regex = regex;
  }

  public boolean accept(Path path) {
    return !path.toString().matches(regex);
  }
}
// ^^ RegexExcludePathFilter

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;

public class RegexPathFilter implements PathFilter {
  
  private final String regex;
  private final boolean include;

  public RegexPathFilter(String regex) {
    this(regex, true);
  }
  
  public RegexPathFilter(String regex, boolean include) {
    this.regex = regex;
    this.include = include;
  }

  public boolean accept(Path path) {
    return (path.toString().matches(regex)) ? include : !include;
  }

}

// cc URLCat Displays files from a Hadoop filesystem on standard output using a URLStreamHandler
import java.io.InputStream;
import java.net.URL;

import org.apache.hadoop.fs.FsUrlStreamHandlerFactory;
import org.apache.hadoop.io.IOUtils;

// vv URLCat
public class URLCat {

  static {
    URL.setURLStreamHandlerFactory(new FsUrlStreamHandlerFactory());
  }
  
  public static void main(String[] args) throws Exception {
    InputStream in = null;
    try {
      in = new URL(args[0]).openStream();
      IOUtils.copyBytes(in, System.out, 4096, false);
    } finally {
      IOUtils.closeStream(in);
    }
  }
}
// ^^ URLCat