Hadoop HDFS 整合 上傳 下載 刪除
2021-10-15 15:10:01

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?新建一個Java項(xiàng)目，導(dǎo)入jar，新建一個測試類，編寫代碼實(shí)現(xiàn)文件操作功能：

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package com.bw.test;

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import java.io.FileInputStream;

import java.io.FileOutputStream;

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import java.io.InputStream;

import java.io.OutputStream;

import java.net.URI;

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import org.apache.commons.compress.utils.IOUtils;

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.fs.FSDataInputStream;

import org.apache.hadoop.fs.FSDataOutputStream;

import org.apache.hadoop.fs.FileStatus;

import org.apache.hadoop.fs.FileSystem;

import org.apache.hadoop.fs.Path;

import org.junit.Before;

import org.junit.Test;

/**

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?* @類描述 :

?* @作者 :

?* @日期 : 2016-7-8 下午5:10:22

?*

?*/

public class test3 {

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??? //hdfs操作入口

??? FileSystem fileSystem = null;

???

??? @Before

??? public void setUp() throws Exception {

??????? URI uri = new URI("hdfs://192.192.192.3:9000");

??????? Configuration configuration = new Configuration();

??????? fileSystem = FileSystem.get(uri, configuration,"root");

??? }

??? @Test

??? public void list() throws Exception {

??????? //遞歸方式取得指定目錄下的文件信息

??????? FileStatus[] liFileStatus = fileSystem.listStatus(new Path("/"));

??????? //輸出取得的文件權(quán)限和文件名稱

??????? for (FileStatus fileStatus : liFileStatus) {

??????????? System.out.println(fileStatus.getPermission()+" "+fileStatus.getPath());

??????? }

??? }

??? //上傳

??? @Test

??? public void put() throws Exception {

??????? //是否覆蓋同名文件（前提是也在同一目錄下）標(biāo)志位

??????? boolean overwrite = true;

??????? //DFS文件輸出流

??????? FSDataOutputStream outputStream = fileSystem.create(new Path("/hbase-1.1.2-bin.tar.gz"),overwrite);

??????? //本地輸入流

??????? InputStream inputStream = new FileInputStream("C:\Users\YAN\Desktop\開發(fā)指南\Hadoop\05. HBase使用指南\安裝程序\hbase-1.1.2-bin.tar.gz");

??????? //使用工具類上傳

??????? IOUtils.copy(inputStream, outputStream,4096);

??? }

??? //下載

??? @Test

??? public void get() throws Exception {

??????? //DFS文件輸入流

??????? FSDataInputStream inputStreamOption = fileSystem.open(new Path("/hbase-1.1.2-bin.tar.gz"));

??????? //本地文件輸出流

??????? OutputStream outputStream = new FileOutputStream("E:\hbase-1.1.2-bin.tar.gz");

??????? //使用工具類下載

??????? IOUtils.copy(inputStreamOption, outputStream,4096);

??? }

??? //刪除

??? @Test

??? public void del() throws Exception {

??????? //是否刪除

??????? boolean b = true;

??????? //DFS文輸入流

??????? fileSystem.delete(new Path("/input"),b);

??? }

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}

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