代码示例：
package com.atguigu.hdfs;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.*;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Arrays;
public class HdfsClient {
private FileSystem fs;
@Before
public void init() throws URISyntaxException, IOException, InterruptedException {
URI uri=new URI("hdfs://master:9000");
Configuration configuration=new Configuration();
String user="root";
fs=FileSystem.get(uri,configuration,user);
}
@After
public void close() throws IOException {
// 3 关闭资源
fs.close();
}
//创建目录
@Test
public void testmkdir() throws IOException, URISyntaxException, InterruptedException {
fs.mkdirs(new Path("/homework"));
}
//上传
@Test
public void testPut() throws IOException {
//
fs.copyFromLocalFile(true,true,new Path("D:\\sunwukong.txt"),new Path("/xiyou/huaguoshan"));
}
@Test
public void testListFiles() throws IOException, InterruptedException,
URISyntaxException {
// 1 获取文件系统
Configuration configuration = new Configuration();
FileSystem fs = FileSystem.get(new URI("hdfs://master:9000"),
configuration, "root");
// 2 获取文件详情
RemoteIterator<LocatedFileStatus> listFiles = fs.listFiles(new Path("/"),
true);
while (listFiles.hasNext()) {
LocatedFileStatus fileStatus = listFiles.next();
System.out.println("========" + fileStatus.getPath() + "=========");
System.out.println(fileStatus.getPermission());
System.out.println(fileStatus.getOwner());
System.out.println(fileStatus.getGroup());
System.out.println(fileStatus.getLen());
System.out.println(fileStatus.getModificationTime());
System.out.println(fileStatus.getReplication());
System.out.println(fileStatus.getBlockSize());
System.out.println(fileStatus.getPath().getName());
// 获取块信息
BlockLocation[] blockLocations = fileStatus.getBlockLocations();
System.out.println(Arrays.toString(blockLocations));
}
// 3 关闭资源
fs.close();
}
}
运行截图：
