Java 如何获取目录中文件的绝对路径？
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How to get absolute paths of files in a directory?
提问by Petr Shypila
I have a directory with files, directories, subdirectories, etc. How I can get the list of absolute paths to all files and directories using the Apache Hadoop API?
我有一个包含文件、目录、子目录等的目录。如何使用 Apache Hadoop API 获取所有文件和目录的绝对路径列表？
采纳答案by Tariq
Using HDFS API :
使用 HDFS API：
package org.myorg.hdfsdemo;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
public class HdfsDemo {
public static void main(String[] args) throws IOException {
Configuration conf = new Configuration();
conf.addResource(new Path("/Users/miqbal1/hadoop-eco/hadoop-1.1.2/conf/core-site.xml"));
conf.addResource(new Path("/Users/miqbal1/hadoop-eco/hadoop-1.1.2/conf/hdfs-site.xml"));
FileSystem fs = FileSystem.get(conf);
System.out.println("Enter the directory name :");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
Path path = new Path(br.readLine());
displayDirectoryContents(fs, path);
}
private static void displayDirectoryContents(FileSystem fs, Path rootDir) {
// TODO Auto-generated method stub
try {
FileStatus[] status = fs.listStatus(rootDir);
for (FileStatus file : status) {
if (file.isDir()) {
System.out.println("This is a directory:" + file.getPath());
displayDirectoryContents(fs, file.getPath());
} else {
System.out.println("This is a file:" + file.getPath());
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
回答by venkat balabhadra
Writer a recursive function which takes a file and check if its a directory or not, if directory list out all files in it and in a for loop check if the file is a directory then recursively call or just return the list of files.
编写一个递归函数，它接受一个文件并检查它是否是一个目录，如果目录列出其中的所有文件，并在 for 循环中检查该文件是否是一个目录，然后递归调用或仅返回文件列表。
Something like this below but not exactly same (here I am returning only .java files)
像下面这样但不完全相同的东西（这里我只返回 .java 文件）
private static List<File> recursiveDir(File file) {
if (!file.isDirectory()) {
// System.out.println("[" + file.getName() + "] is not a valid directory");
return null;
}
List<File> returnList = new ArrayList<File>();
File[] files = file.listFiles();
for (File f : files) {
if (!f.isDirectory()) {
if (f.getName().endsWith("java")) {
returnList.add(f);
}
} else {
returnList.addAll(recursiveDir(f));
}
}
return returnList;
}
回答by Rahul
with hdfs you can use hadoop fs -lsr .
使用 hdfs，您可以使用 hadoop fs -lsr 。
