HDFS之FileSystem

Posted 2020-09-19 亲爱的不二999

package cn.hx.test;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.io.IOUtils;
import org.apache.log4j.BasicConfigurator;

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

public class test1 {
    public static void main(String[] args) throws IOException {
        BasicConfigurator.configure();
        try {
            //链接hdfs的URL
            URI uri = new URI("hdfs://192.168.22.131:9000");
            Configuration conf = new Configuration();
            FileSystem fileSystem = FileSystem.get(uri, conf);


            //filestatus表示hdfs中的每一个文件夹
            FileStatus[] listStatus = fileSystem.listStatus(new Path("/"));
            for (FileStatus fileStatus : listStatus) {

                System.out.println(fileStatus);
                System.out.println("文件路径：" + fileStatus.getPath());
                System.out.println("是否是一个目录：" + fileStatus.isDirectory());
                System.out.println("修改时间:" + fileStatus.getModificationTime());
                System.out.println("访问时间：" + fileStatus.getAccessTime());
                System.out.println("所有者：" + fileStatus.getOwner());
                System.out.println("用户：" + fileStatus.getGroup());
                System.out.println("文件权限：" + fileStatus.getPermission());
                System.out.println("是否是？：" + fileStatus.getSymlink());

            }
        } catch (Exception e) {
        }
    }
    //下载文件
    private static void open(FileSystem fileSystem) throws IOException {
        FSDataInputStream in = fileSystem.open(new Path("/test/1"));
        IOUtils.copyBytes(in, System.out, 1024, true);
    }


    //上传文件
    private static void put(FileSystem fileSystem) throws IOException {
        FSDataOutputStream out = fileSystem.create(new Path("/test/1"));
        FileInputStream in = new FileInputStream("\\u202AE:\\\\BigDataVideos\\\\Hadoop 7\\\\2015-12-30 【hadoop】\\\\edits.xml");
        IOUtils.copyBytes(in, out, 1024, true);
    }


}

 

结果：