@Test

public void putFileToHDFS() throws Exception{

// 1 创建配置信息对象

Configuration configuration = new Configuration();

FileSystem fs = FileSystem.get(new URI("hdfs://hadoop102:9000"),configuration, "root");

// 2 创建输入流

FileInputStream inStream = new FileInputStream(new File("e:/hello.txt"));

// 3 获取输出路径

String putFileName = "hdfs://hadoop102:9000/user/root/hello1.txt";

Path writePath = new Path(putFileName);

// 4 创建输出流

FSDataOutputStream outStream = fs.create(writePath);

// 5 流对接

try{

IOUtils.copyBytes(inStream, outStream, 4096, false);

}catch(Exception e){

e.printStackTrace();

}finally{

IOUtils.closeStream(inStream);

IOUtils.closeStream(outStream);

}

}

@Test

public void getFileToHDFS() throws Exception{

// 1 创建配置信息对象

Configuration configuration = new Configuration();

FileSystem fs = FileSystem.get(new URI("hdfs://hadoop102:9000"),configuration, "root");

// 2 获取读取文件路径

String filename = "hdfs://hadoop102:9000/user/root/hello1.txt";

// 3 创建读取path

Path readPath = new Path(filename);

// 4 创建输入流

FSDataInputStream inStream = fs.open(readPath);

// 5 流对接输出到控制台

try{

IOUtils.copyBytes(inStream, System.out, 4096, false);

}catch(Exception e){

e.printStackTrace();

}finally{

IOUtils.closeStream(inStream);

}

}

@Test

// 定位下载第一块内容

public void readFileSeek1() throws Exception {

// 1 创建配置信息对象

Configuration configuration = new Configuration();

FileSystem fs = FileSystem.get(new URI("hdfs://hadoop102:9000"), configuration, "root");

// 2 获取输入流路径

Path path = new Path("hdfs://hadoop102:9000/user/atguigu/tmp/hadoop-2.7.2.tar.gz");

// 3 打开输入流

FSDataInputStream fis = fs.open(path);

// 4 创建输出流

FileOutputStream fos = new FileOutputStream("e:/hadoop-2.7.2.tar.gz.part1");

// 5 流对接

byte[] buf = new byte[1024];

for (int i = 0; i < 128 * 1024; i++) {

fis.read(buf);

fos.write(buf);

}

// 6 关闭流

IOUtils.closeStream(fis);

IOUtils.closeStream(fos);

}

@Test

// 定位下载第二块内容

public void readFileSeek2() throws Exception{

// 1 创建配置信息对象

Configuration configuration = new Configuration();

FileSystem fs = FileSystem.get(new URI("hdfs://hadoop102:9000"), configuration, "root");

// 2 获取输入流路径

Path path = new Path("hdfs://hadoop102:9000/user/atguigu/tmp/hadoop-2.7.2.tar.gz");

// 3 打开输入流

FSDataInputStream fis = fs.open(path);

// 4 创建输出流

FileOutputStream fos = new FileOutputStream("e:/hadoop-2.7.2.tar.gz.part2");

// 5 定位偏移量（第二块的首位）

fis.seek(1024 * 1024 * 128);

// 6 流对接

IOUtils.copyBytes(fis, fos, 1024);

// 7 关闭流

IOUtils.closeStream(fis);

IOUtils.closeStream(fos);

}