文件下载

package com.hadoop.hdfs;

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

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

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

        //1. 获取fs对象
        Configuration conf=new Configuration();
        FileSystem fs=FileSystem.get(new URI("hdfs://localhost:9000"),conf,"root");

        //2. 执行上传API

        fs.copyToLocalFile(false/*是否删除源文件*/,new Path("/example.txt"),new Path("e:/example.txt"),true/*是否使用本地文件系统*/);

        //3.关闭资源
        fs.close();

        System.out.println("over");
    }
}