FileDown

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import org.apache.hadoop.conf.*;
import org.apache.hadoop.fs.*;

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

public class FileDown {

    public static void main(String[] args) throws URISyntaxException, IOException, InterruptedException {
        Configuration conf=new Configuration();
           URI uri=new URI("hdfs://192.168.1.100:9000");
           FileSystem fs=FileSystem.get(uri,conf,"hadoop");
           //HDFS文件:"/a.txt"為hdfs的文件，如果沒有該文件請從Linux上傳一個文件到HDFS.                                    
           Path src=new Path("/user/hadoop/myfile1");
           //local文件：在Windows D盤創建一個文件夾test存放下載的文件
           Path dst=new Path("C:\\Users\\Raodi\\Desktop\\BCtest\\setup");
           //從HDFS下載文件到本地
           fs.copyToLocalFile(src,dst);
           /**
            * C:\\Users\\Raodi\\Desktop\\BCtest\\setup
            * C:\\Users\\Raodi\\Desktop\\BCtest\\setup\\   兩者無區別，無改名現象
            */

    }

}