如何将hadoop罐加入classpath？(how add hadoop jars to classpath?)

 我的mac上的Hadoop 2.7.3安装在： 
 
/usr/local/Cellar/hadoop/2.7.3
 
 我编写了一个demo来使用java从HDFS读取文件： 
 
import java.io.*;
import java.net.URI;
import java.net.URISyntaxException;
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;
import org.apache.hadoop.io.IOUtils;

public class HDFSTest{

public static void main(String[] args) throws IOException, URISyntaxException{

  String file= "hdfs://localhost:9000/hw1/customer.tbl";
  Configuration conf = new Configuration();
  FileSystem fs = FileSystem.get(URI.create(file), conf);
  Path path = new Path(file);
  FSDataInputStream in_stream = fs.open(path);
  BufferedReader in = new BufferedReader(new      
  InputStreamReader(in_stream));
  String s;
     while ((s=in.readLine())!=null) {
        System.out.println(s);
     }
    in.close();
    fs.close();
  }
}
 
 当我编译java文件时，错误如图所示： 
 
hero:Documents yaopan$ javac HDFSTest.java 
HDFSTest.java:8: error: package org.apache.hadoop.conf does not exist
import org.apache.hadoop.conf.Configuration;
                         ^
HDFSTest.java:10: error: package org.apache.hadoop.fs does not exist
import org.apache.hadoop.fs.FSDataInputStream;
                       ^
HDFSTest.java:12: error: package org.apache.hadoop.fs does not exist
import org.apache.hadoop.fs.FSDataOutputStream;
                       ^
HDFSTest.java:14: error: package org.apache.hadoop.fs does not exist
import org.apache.hadoop.fs.FileSystem;
 
 我知道原因是找不到hadoop jar，怎么配置？^ 

Hadoop 2.7.3 on my mac is installed at:
 
/usr/local/Cellar/hadoop/2.7.3
 
I write a demo to read file from HDFS using java:
 
import java.io.*;
import java.net.URI;
import java.net.URISyntaxException;
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;
import org.apache.hadoop.io.IOUtils;

public class HDFSTest{

public static void main(String[] args) throws IOException, URISyntaxException{

  String file= "hdfs://localhost:9000/hw1/customer.tbl";
  Configuration conf = new Configuration();
  FileSystem fs = FileSystem.get(URI.create(file), conf);
  Path path = new Path(file);
  FSDataInputStream in_stream = fs.open(path);
  BufferedReader in = new BufferedReader(new      
  InputStreamReader(in_stream));
  String s;
     while ((s=in.readLine())!=null) {
        System.out.println(s);
     }
    in.close();
    fs.close();
  }
}
 
When I compile the java file ,error as shown blow：
 
hero:Documents yaopan$ javac HDFSTest.java 
HDFSTest.java:8: error: package org.apache.hadoop.conf does not exist
import org.apache.hadoop.conf.Configuration;
                         ^
HDFSTest.java:10: error: package org.apache.hadoop.fs does not exist
import org.apache.hadoop.fs.FSDataInputStream;
                       ^
HDFSTest.java:12: error: package org.apache.hadoop.fs does not exist
import org.apache.hadoop.fs.FSDataOutputStream;
                       ^
HDFSTest.java:14: error: package org.apache.hadoop.fs does not exist
import org.apache.hadoop.fs.FileSystem;
 
I know the reason is can not find hadoop jars，how to configure that？ ^

原文：https://stackoverflow.com/questions/40566172