我知道用于 Java 文件目录处理的 Apache Commons IO 库。然而，List all files from a directory recursive with Java谈到了 Java 7 中的本机支持。
有没有人有关于如何使用 Java 7 递归地列出/读取目录中的文件的经验？
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5145 次
2 回答
5
有一个教程。基本上，您实现了一个访问者，然后可以在进入、退出和遇到文件时调用它。支持确定文件是否为符号链接，以及遵循符号链接的选项（如果您愿意的话）。快速阅读一下 JavaPath可能有用，整个文档从这里开始。
import static java.nio.file.FileVisitResult.*;
public static class PrintFiles
extends SimpleFileVisitor<Path> {
// Print information about
// each type of file.
@Override
public FileVisitResult visitFile(Path file,
BasicFileAttributes attr) {
if (attr.isSymbolicLink()) {
System.out.format("Symbolic link: %s ", file);
} else if (attr.isRegularFile()) {
System.out.format("Regular file: %s ", file);
} else {
System.out.format("Other: %s ", file);
}
System.out.println("(" + attr.size() + "bytes)");
return CONTINUE;
}
// Print each directory visited.
@Override
public FileVisitResult postVisitDirectory(Path dir,
IOException exc) {
System.out.format("Directory: %s%n", dir);
return CONTINUE;
}
// If there is some error accessing
// the file, let the user know.
// If you don't override this method
// and an error occurs, an IOException
// is thrown.
@Override
public FileVisitResult visitFileFailed(Path file,
IOException exc) {
System.err.println(exc);
return CONTINUE;
}
}
find说明文件遍历的第二个示例（来自 的 Java 实现）可以很容易地修改为“匹配”所有文件。
/*
* Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle or the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
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();
}
}
在我的系统（Linux / Fedora）上，它运行良好；但是，我只是在测试它的功能，并使用它。我没有对它的性能或任何其他有意义的测量进行压力测试（除了“它有效”）。
于 2012-05-09T20:33:11.293 回答
0
（没有使用它的经验，但我只是在文档中找到它，它看起来很容易使用。）
于 2012-05-09T20:30:00.137 回答