我正在集成测试我的代码的一部分，它在SVN下创建目录树。这要求我测试目录结构和内部文件是否我期望它们是。测试两个目录树是否相等
一方面我有我想要的文件，并在其他预期的目录树中的文件，从SVN出口（喜欢svn export超过svn co避免.svn噪声）。
但是，是否有任何库可以断言两个目录树？我想到的最后一招是自己做一个迭代比较。
基本上我正在寻找一个API，可以接受两个目录，并告诉我他们是否相等。对
boolean areDirectoriesEqual(File dir1, File dir2)
import java.io.File;
/**
*
* FileUtils is a collection of routines for common file system operations.
*
* @author Dan Jemiolo (danj)
*
*/
public final class FileUtils {
/**
*
* This is a convenience method that calls find(File, String, boolean) with
* the last parameter set to "false" (does not match directories).
*
* @see #find(File, String, boolean)
*
*/
public static File find(File contextRoot, String fileName) {
return find(contextRoot, fileName, false);
}
/**
*
* Searches through the directory tree under the given context directory and
* finds the first file that matches the file name. If the third parameter is
* true, the method will also try to match directories, not just "regular"
* files.
*
* @param contextRoot
* The directory to start the search from.
*
* @param fileName
* The name of the file (or directory) to search for.
*
* @param matchDirectories
* True if the method should try and match the name against directory
* names, not just file names.
*
* @return The java.io.File representing the <em>first</em> file or
* directory with the given name, or null if it was not found.
*
*/
public static File find(File contextRoot, String fileName, boolean matchDirectories) {
if (contextRoot == null)
throw new NullPointerException("NullContextRoot");
if (fileName == null)
throw new NullPointerException("NullFileName");
if (!contextRoot.isDirectory()) {
Object[] filler = { contextRoot.getAbsolutePath() };
String message = "NotDirectory";
throw new IllegalArgumentException(message);
}
File[] files = contextRoot.listFiles();
//
// for all children of the current directory...
//
for (int n = 0; n < files.length; ++n) {
String nextName = files[n].getName();
//
// if we find a directory, there are two possibilities:
//
// 1. the names match, AND we are told to match directories.
// in this case we're done
//
// 2. not told to match directories, so recurse
//
if (files[n].isDirectory()) {
if (nextName.equals(fileName) && matchDirectories)
return files[n];
File match = find(files[n], fileName);
if (match != null)
return match;
}
//
// in the case of regular files, just check the names
//
else if (nextName.equals(fileName))
return files[n];
}
return null;
}
}
OK线
东西，所以我不知道任何现成的一段代码，这是否和搜索没有帮助的。因此，这里是我将如何实现它
如果您只是想将树标记为已更改/未更改，则可以保存每个文件的散列，那么你需要一个hashmap而不是hashset，其中t他的每一个文件的内容哈希散列映射的值
希望这有助于
是的，算法没问题。但我主要是在寻找能够完成所有这些工作的第三方库。 – adarshr
是的我明白你的问题，但据说我找不到任何东西:(所以.. –
我不知道任何areDirsEqual库;我能想到的最接近的是Commons FileUtils中的listFiles方法。
如果您将得到的集合放在HashSet中，您应该能够有效地比较这两个集合。它可以在两行中完成，甚至可以是一行代码。
东西在这条线：
public static boolean areDirsEqual(File dir, File dir2) {
return (new HashSet<File>(FileUtils.listFiles(dir1,..))).
containsAll(FileUtils.listFiles(dir2, ..))
}
。
private static void verifyDirsAreEqual(Path one, Path other) throws IOException {
Files.walkFileTree(one, new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(Path file,
BasicFileAttributes attrs)
throws IOException {
FileVisitResult result = super.visitFile(file, attrs);
// get the relative file name from path "one"
Path relativize = one.relativize(file);
// construct the path for the counterpart file in "other"
Path fileInOther = other.resolve(relativize);
log.debug("=== comparing: {} to {}", file, fileInOther);
byte[] otherBytes = Files.readAllBytes(fileInOther);
byte[] thisBytes = Files.readAllBytes(file);
if (!Arrays.equals(otherBytes, thisTypes)) {
throw new AssertionFailedError(file + " is not equal to " + fileInOther);
}
return result;
}
});
}
注意：这仅仅是在比较两个文件夹的实际文件。如果你有空的文件夹等你想比较，你可能需要做一些额外的事情。
我有同样的问题，并跟随帕特里克和洛伦佐Dematté我找到了一个适合我的解决方案。下面的代码遍历文件夹：
我在linux上测试过它。
private static void verifyDirsAreEqual(File expected, File generated)
throws IOException {
// Checks parameters
assertTrue("Generated Folder doesn't exist: " + generated,generated.exists());
assertTrue("Generated is not a folder?!?!: " + generated,generated.isDirectory());
assertTrue("Expected Folder doesn't exist: " + expected,expected.exists());
assertTrue("Expected is not a folder?!?!: " + expected,expected.isDirectory());
Files.walkFileTree(expected.toPath(), new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult preVisitDirectory(Path dir,
BasicFileAttributes attrs)
throws IOException {
FileVisitResult result = super.preVisitDirectory(dir, attrs);
// get the relative file name from path "expected"
Path relativize = expected.toPath().relativize(dir);
// construct the path for the counterpart file in "generated"
File otherDir = generated.toPath().resolve(relativize).toFile();
log.debug("=== preVisitDirectory === compare " + dir + " to " + otherDir);
assertEquals("Folders doesn't contain same file!?!?",
Arrays.toString(dir.toFile().list()),
Arrays.toString(otherDir.list()));
return result;
}
@Override
public FileVisitResult visitFile(Path file,
BasicFileAttributes attrs)
throws IOException {
FileVisitResult result = super.visitFile(file, attrs);
// get the relative file name from path "expected"
Path relativize = expected.toPath().relativize(file);
// construct the path for the counterpart file in "generated"
File fileInOther = generated.toPath().resolve(relativize).toFile();
log.debug("=== comparing: " + file + " to " + fileInOther);
String expectedContents = FileUtils.readFileToString(file.toFile());
String generatedContents = FileUtils.readFileToString(fileInOther);
assertEquals("("+fileInOther+") csv standard doesn't match expected ("+file+")!", expectedContents, generatedContents);
return result;
}
});
}
这是使用Java NIO包简单迭代溶液（不使用访问者模式，因此它可以适于较早的Java版本以及）。
当然可以调整，但现在这是一个简单的解决方案，从两个目录的视图中检查每个文件是否出现，并可选择使用Apache Commons FileUtils比较文件内容。
/**
* checks if the directory file lists and file content is equal
*
* @param directory
* the directory
* @param compareDirectory
* the directory to compare with
* @param checkFileContent
* also compare file content
* @return true if directory and compareDirectory are equal
* @throws IOException
*/
public static boolean isEqualDirectories(Path directory, Path compareDirectory, boolean checkFileContent) throws IOException {
boolean check = isEverythingInCompareDirectory(directory, compareDirectory, checkFileContent);
boolean checkOpposite = check && isEverythingInCompareDirectory(directory, compareDirectory, checkFileContent);
return check && checkOpposite;
}
/**
* checks if the directory file lists and file content is equal
*
* @param directory
* the directory
* @param compareDirectory
* the directory to compare with
* @param checkFileContent
* also compare file content
* @return true if directory and compareDirectory are equal
* @throws IOException
*/
public static boolean isEverythingInCompareDirectory(Path directory, Path compareDirectory, boolean checkFileContent)
throws IOException {
try {
LOGGER.info("checking directory " + directory);
File directoryFile = directory.toFile();
File compareFile = compareDirectory.toFile();
// check, if there is the same number of files/subdirectories
File[] directoryFiles = directoryFile.listFiles();
File[] compareFiles = compareFile.listFiles();
if (directoryFiles.length == compareFiles.length) {
return compareDirectoryContents(directory, compareDirectory, checkFileContent);
} else {
LOGGER.info("number of files in directory are different " + directoryFiles.length + " vs compareDirectory: " + compareFiles.length);
return false;
}
} catch (IOException e) {
throw new RuntimeException("Failed to assert that all files are equal", e);
}
}
public static boolean compareDirectoryContents(Path directory, Path compareDirectory, boolean checkFileContent) throws IOException {
try (DirectoryStream<Path> directoryStream = Files.newDirectoryStream(directory)) {
for (Path directoryFilePath : directoryStream) {
// search for directoryFile in the compareDirectory
Path compareFilePath = compareDirectory.resolve(directoryFilePath.getFileName());
if (compareFilePath != null) {
File directoryFile = directoryFilePath.toFile();
if (directoryFile.isFile()) {
LOGGER.info("checking file " + directoryFilePath);
if (checkFileContent && !FileUtils.contentEquals(compareFilePath.toFile(), directoryFile)) {
LOGGER.info("files not equal: compare: " + compareFilePath.toFile() + ", directory: " + directoryFilePath.getFileName() + "!");
return false;
}
} else {
LOGGER.info("going into recursion with directory " + directoryFilePath);
boolean result = isEverythingInCompareDirectory(directoryFilePath, compareFilePath, checkFileContent);
// cancel if not equal, otherwise continue processing
if (!result) {
return false;
}
}
} else {
LOGGER.info(directoryFilePath.toString() + ": compareFilepath not found");
return false;
}
}
}
return true;
}
我在Kotlin写了这个小代码。它不检查文件的内容，但完全依赖apache的md5。
import org.apache.commons.codec.digest.DigestUtils
fun File.calcMD5() = DigestUtils.md5Hex(FileUtils.readFileToByteArray(this))
fun compareTwoDirs(dir1: File, dir2: File): Boolean {
val files1 = dir1.listFiles().sorted()
val files2 = dir2.listFiles().sorted()
if (files1.size != files2.size) return false
return files1.zip(files2).all { equate(it.first, it.second) }
}
fun equate(fl: File, fl2: File): Boolean {
if (fl.isFile && fl2.isFile) return fl.calcMD5() == fl2.calcMD5()
if (fl.isDirectory && fl2.isDirectory) return compareTwoDirs(fl, fl2)
return false
}
我帕特里克的解决方案似乎是一个很好的解决方案，但与骆驼（保险丝ESB）组合我有最后的父文件夹仍然封锁保险丝过程=>我的后续问题解决方案是更好的方法。我遍历目录疗法通过SimpleVistor，并提出了一套类似的展台目录
public boolean compareFolders(final Path pathOne, final Path pathSecond) throws IOException {
// get content of first directory
final TreeSet<String> treeOne = new TreeSet();
Files.walkFileTree(pathOne, new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
Path relPath = pathOne.relativize(file);
String entry = relPath.toString();
treeOne.add(entry);
return FileVisitResult.CONTINUE;
}
});
// get content of second directory
final TreeSet<String> treeSecond = new TreeSet();
Files.walkFileTree(pathSecond, new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
Path relPath = pathSecond.relativize(file);
String entry = relPath.toString();
treeSecond.add(entry);
return FileVisitResult.CONTINUE;
}
});
return treeOne.equals(treeSecond);
}
因此，在总结，你有文件的两个目录结构，你想这两种结构放在一起比较？ –
是的。那就对了。现在，我甚至不在乎它们之间的差异。我只需要知道他们是否平等。 – adarshr
如果您使用的是Java 7，也许可以创建两个[FileVisitors]（http://docs.oracle.com/javase/7/docs/api/java/nio/file/FileVisitor.html），然后走树？ – hertzsprung