[英]How to get all files from directory and sub directory with a given pattern
I have a directory containing sub directories each one of this directories has a file called *.properties 我有一个包含子目录的目录,每个目录都有一个名为* .properties的文件
I want to search for these files with java 我想用Java搜索这些文件
Thanks 谢谢
You can recursively call this method 您可以递归调用此方法
File dir = new File("C:/");
File [] files = dir.listFiles(new FilenameFilter() {
@Override
public boolean accept(File dir, String name) {
return name.endsWith(".properties");
}
});
Alternately you use Java 7 Files.walkTree method and filter as described here . 或者,您使用Java 7 Files.walkTree方法并按此处所述进行过滤。
See the java tutorial Walking the File Tree : 请参阅Java教程“ 遍历文件树” :
Do you need to create an application that will recursively visit all the files in a file tree? 您是否需要创建一个可以递归访问文件树中所有文件的应用程序? Perhaps you need to delete every .class file in a tree, or find every file that hasn't been accessed in the last year. 也许您需要删除树中的每个.class文件,或者查找去年未访问的每个文件。 You can do so with the FileVisitor interface. 您可以使用FileVisitor界面执行此操作。
In particular see the Finding Files example: 特别是请参阅“ 查找文件”示例:
import java.io.*;
import java.nio.file.*;
import java.nio.file.attribute.*;
import static java.nio.file.FileVisitResult.*;
import static java.nio.file.FileVisitOption.*;
import java.util.*;
/**
* Sample code that finds files that
* match the specified glob pattern.
* For more information on what
* constitutes a glob pattern, see
* http://docs.oracle.com/javase/javatutorials/tutorial/essential/io/fileOps.html#glob
*
* The file or directories that match
* the pattern are printed to
* standard out. The number of
* matches is also printed.
*
* When executing this application,
* you must put the glob pattern
* in quotes, so the shell will not
* expand any wild cards:
* java Find . -name "*.java"
*/
public class Find {
/**
* A {@code FileVisitor} that finds
* all files that match the
* specified pattern.
*/
public static class Finder
extends SimpleFileVisitor<Path> {
private final PathMatcher matcher;
private int numMatches = 0;
Finder(String pattern) {
matcher = FileSystems.getDefault()
.getPathMatcher("glob:" + pattern);
}
// Compares the glob pattern against
// the file or directory name.
void find(Path file) {
Path name = file.getFileName();
if (name != null && matcher.matches(name)) {
numMatches++;
System.out.println(file);
}
}
// Prints the total number of
// matches to standard out.
void done() {
System.out.println("Matched: "
+ numMatches);
}
// Invoke the pattern matching
// method on each file.
@Override
public FileVisitResult visitFile(Path file,
BasicFileAttributes attrs) {
find(file);
return CONTINUE;
}
// Invoke the pattern matching
// method on each directory.
@Override
public FileVisitResult preVisitDirectory(Path dir,
BasicFileAttributes attrs) {
find(dir);
return CONTINUE;
}
@Override
public FileVisitResult visitFileFailed(Path file,
IOException exc) {
System.err.println(exc);
return CONTINUE;
}
}
static void usage() {
System.err.println("java Find <path>" +
" -name \"<glob_pattern>\"");
System.exit(-1);
}
public static void main(String[] args)
throws IOException {
if (args.length < 3 || !args[1].equals("-name"))
usage();
Path startingDir = Paths.get(args[0]);
String pattern = args[2];
Finder finder = new Finder(pattern);
Files.walkFileTree(startingDir, finder);
finder.done();
}
}
In addition to other answers: 除了其他答案:
Guava (since v15): 番石榴(v15起):
for (File f : Files.fileTreeTraverser().preOrderTraversal(rootDir)) {
// filter and process
}
Commons IO: 共用IO:
for (File f : FileUtils.listFiles(rootDir, fileFilter, dirFilter)) {
// process
}
Java 7: Java 7:
Files.walkFileTree(rootDir, fileVisitor);
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.