Hadoop 用命令行編譯URLCat

Hadoop 用命令行編譯URLCat

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;

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

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);
  }
 }
}

編譯

javac -classpath hadoop-core-1.1.2.jar -d secondProject secondProject/URLCat.java

生成JAR

jar -cvf URLCat.jar -C secondProject/ . 

hadoop jar URLCat.jar URLCat hdfs://localhost:49000/user/hadoop/input/file01

路徑根據

 <property>
  <name>fs.default.name</name>
  <value>hdfs://localhost:49000</value>
 </property>

調整

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