1. 使用JavaAPI实现对HDFS文件系统进行操作； 2. 操作功能要求：提供创建文件夹、删除文件夹、重命名文件夹、列出文件详情、上传文件及下载文件的功能；

1. 使用Java API实现对HDFS文件系统进行操作可以通过Hadoop的HDFS客户端库来实现。首先需要引入Hadoop的相关依赖，然后可以使用以下代码进行操作：

- 创建文件夹：

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

public class HdfsOperations {
    public static void createFolder(String folderPath) throws Exception {
        Configuration conf = new Configuration();
        FileSystem fs = FileSystem.get(conf);
        Path path = new Path(folderPath);
        fs.mkdirs(path);
        fs.close();
    }
}

- 删除文件夹：

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

public class HdfsOperations {
    public static void deleteFolder(String folderPath) throws Exception {
        Configuration conf = new Configuration();
        FileSystem fs = FileSystem.get(conf);
        Path path = new Path(folderPath);
        fs.delete(path, true);
        fs.close();
    }
}

- 重命名文件夹：

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

public class HdfsOperations {
    public static void renameFolder(String oldPath, String newPath) throws Exception {
        Configuration conf = new Configuration();
        FileSystem fs = FileSystem.get(conf);
        Path oldFolderPath = new Path(oldPath);
        Path newFolderPath = new Path(newPath);
        fs.rename(oldFolderPath, newFolderPath);
        fs.close();
    }
}

- 列出文件详情：

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.Path;

public class HdfsOperations {
    public static void listFiles(String folderPath) throws Exception {
        Configuration conf = new Configuration();
        FileSystem fs = FileSystem.get(conf);
        Path path = new Path(folderPath);
        FileStatus[] fileStatuses = fs.listStatus(path);
        for (FileStatus fileStatus : fileStatuses) {
            System.out.println(fileStatus.getPath());
        }
        fs.close();
    }
}

- 上传文件：

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

public class HdfsOperations {
    public static void uploadFile(String localFilePath, String hdfsFilePath) throws Exception {
        Configuration conf = new Configuration();
        FileSystem fs = FileSystem.get(conf);
        Path localPath = new Path(localFilePath);
        Path hdfsPath = new Path(hdfsFilePath);
        fs.copyFromLocalFile(localPath, hdfsPath);
        fs.close();
    }
}

- 下载文件：

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

public class HdfsOperations {
    public static void downloadFile(String hdfsFilePath, String localFilePath) throws Exception {
        Configuration conf = new Configuration();
        FileSystem fs = FileSystem.get(conf);
        Path hdfsPath = new Path(hdfsFilePath);
        Path localPath = new Path(localFilePath);
        fs.copyToLocalFile(hdfsPath, localPath);
        fs.close();
    }
}

以上是使用Java API实现对HDFS文件系统进行操作的一些基本功能。你可以根据需要进行调用。