[英]Copy Json Flat file from local to HDFS
package com.Main;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
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;
public class Main {
public static void main(String[] args) throws IOException {
//Source file in the local file system
String localSrc = args[0];
//Destination file in HDFS
String dst = args[1];
//Input stream for the file in local file system to be written to HDFS
InputStream in = new BufferedInputStream(new FileInputStream(localSrc));
//Get configimport org.apache.commons.configuration.Configuration;uration of Hadoop system
Configuration conf = new Configuration();
System.out.println("Connecting to -- "+conf.get("fs.defaultFS"));
//Destination file in HDFS
FileSystem fs = FileSystem.get(URI.create(dst), conf);
OutputStream out = fs.create(new Path(dst));
//Copy file from local to HDFS
IOUtils.copyBytes(in, out, 4096, true);
System.out.println(dst + " copied to HDFS");
}
}
AM收到以下错误消息“ 线程“ main ”中的异常java.lang.ArrayIndexOutOfBoundsException:com.Main.Main.main(Main.java:22)为0 ”
我本地有Json文件,必须在HDFS Ex中移动它: {“ Del”:“ Ef77xvP”,“ time”:1509073785106},{“ Del”:“ 2YXsF7r”,“ time”:1509073795109}
指定程序的命令行参数。 您的代码片段期望第一个参数为源,而下一个参数为目标。 有关更多详细信息,请参阅什么是“ String args []”? 主方法Java中的参数
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