打印目录树
我必须打印一个目录树（如树命令），例如：
. +---A | +---IMAGES | +---BACKUP +---ADOKS | +---ROZDZIAL_2 | +---ROZDZIAL_3 | +---ROZDZIAL_4 +---AMSC2005 | +---AMSC2004 +---FCCS2005 | +---source | +---TMP +---LODZ2004 +---ZAKOPANE2004 +---DYDAKTYKA | +---DYDAKTYKA_ISI | | +---COLLS | | | +---Q1 | | | +---Q2 | | | +---RAZEM | | | +---RYSUNKI_COLL1 | | | +---RYSUNKI_COLL2 | | +---IMAGES | | +---src | | +---WYKLAD5 | +---DYDAKTYKA_PRG | +---images | +---POMOC +---DYDAKTYKA_KST | +---images | +---src +---DYDAKTYKA_WPR +---images +---src 我尝试使用以下代码：
private static void getInto(String p, int n) { File path = new File(p); File[] list = path.listFiles(); for (int i = 0; i < list.length; i++) { if (list[i].isDirectorhowny()) { for (int j = 0; j < n; j++) if (WHAT HERE?) System.out.print("| "); else System.out.print(" "); System.out.println("+--" + list[i].getName().toString()); getInto(list[i].getPath(), n + 1); } } }
我试过几个版本，但它仍然不起作用。 这个怎么做？ 如果有什么条件？ 我知道很简单，但我不能这样做。
这就是我做到的。
代码
import java.io.File; public class FileAssert { /** * Pretty print the directory tree and its file names. * * @param folder * must be a folder. * @return */ public static String printDirectoryTree(File folder) { if (!folder.isDirectory()) { throw new IllegalArgumentException("folder is not a Directory"); } int indent = 0; StringBuilder sb = new StringBuilder(); printDirectoryTree(folder, indent, sb); return sb.toString(); } private static void printDirectoryTree(File folder, int indent, StringBuilder sb) { if (!folder.isDirectory()) { throw new IllegalArgumentException("folder is not a Directory"); } sb.append(getIndentString(indent)); sb.append("+--"); sb.append(folder.getName()); sb.append("/"); sb.append("\n"); for (File file : folder.listFiles()) { if (file.isDirectory()) { printDirectoryTree(file, indent + 1, sb); } else { printFile(file, indent + 1, sb); } } } private static void printFile(File file, int indent, StringBuilder sb) { sb.append(getIndentString(indent)); sb.append("+--"); sb.append(file.getName()); sb.append("\n"); } private static String getIndentString(int indent) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < indent; i++) { sb.append("| "); } return sb.toString(); } }
结果
+--folder1/ | +--a.txt | +--folder2/ | | +--b1.txt | | +--b2.txt | | +--b3.txt | | +--folder3/ | +--folder4/
UnitTest
import static org.junit.Assert.*; import java.io.File; import org.junit.Before; import org.junit.Rule; import org.junit.Test; import org.junit.rules.TemporaryFolder; import org.junit.runner.RunWith; import org.junit.runners.JUnit4; @RunWith(JUnit4.class) public class FileAssertTest { @Rule public TemporaryFolder temporaryFolder = new TemporaryFolder(); private File folder1; @Before public void setUp() { folder1 = temporaryFolder.newFolder("folder1"); } @Test public void testPrintDirectoryTreeWhenFolderIsEmpty() { // Invoke String actual = FileAssert.printDirectoryTree(folder1); // Verify assertEquals("+--folder1/\n", actual); } private static final String EXPECTED_FCOF = "" + "+--folder1/\n" + "| +--a.txt\n"; @Test public void testPrintDirectoryTreeWhenFolderContainsOneFile() throws Exception { // Setup File aFile = new File(folder1, "a.txt"); assertTrue(aFile.createNewFile()); // Invoke String actual = FileAssert.printDirectoryTree(folder1); // Verify assertEquals(EXPECTED_FCOF, actual); } private static final String EXPECTED_COMPLEX = "+--folder1/\n" + "| +--a.txt\n" + "| +--folder2/\n" + "| | +--b1.txt\n" + "| | +--b2.txt\n" + "| | +--b3.txt\n" + "| | +--folder3/\n" + "| +--folder4/\n"; @Test public void testPrintDirectoryTreeComplex() throws Exception { // Setup File aFile = new File(folder1, "a.txt"); assertTrue(aFile.createNewFile()); File folder2 = new File(folder1, "folder2"); assertTrue(folder2.mkdir()); File b1File = new File(folder2, "b1.txt"); assertTrue(b1File.createNewFile()); File b2File = new File(folder2, "b2.txt"); assertTrue(b2File.createNewFile()); File folder3 = new File(folder2, "folder3"); assertTrue(folder3.mkdir()); File b3File = new File(folder2, "b3.txt"); assertTrue(b3File.createNewFile()); File folder4 = new File(folder1, "folder4"); assertTrue(folder4.mkdir()); // Invoke String actual = FileAssert.printDirectoryTree(folder1); // Verify assertEquals(EXPECTED_COMPLEX, actual); } }
文件 目录 打印 漂亮的打印
你需要打印出“|” 无论何时在相应的级别上，您都不处理最后一个条目，而是处理最后一个条目之一。 你需要分别知道每个级别的这个，所以你可以添加一个位掩码或一个字符串（比如说）作为’getInto’的额外参数。
这是我的解决方案：
（从那里复制TreeNode类。）
public static String renderDirectoryTree(TreeNode tree) { List lines = renderDirectoryTreeLines(tree); String newline = System.getProperty("line.separator"); StringBuilder sb = new StringBuilder(lines.size() * 20); for (StringBuilder line : lines) { sb.append(line); sb.append(newline); } return sb.toString(); } public static List renderDirectoryTreeLines(TreeNode tree) { List result = new LinkedList<>(); result.add(new StringBuilder().append(tree.getData().getPath().getFileName())); Iterator> iterator = tree.getChildren().iterator(); while (iterator.hasNext()) { List subtree = renderDirectoryTreeLines(iterator.next()); if (iterator.hasNext()) { addSubtree(result, subtree); } else { addLastSubtree(result, subtree); } } return result; } private static void addSubtree(List result, List subtree) { Iterator iterator = subtree.iterator(); //subtree generated by renderDirectoryTreeLines has at least one line which is tree.getData() result.add(iterator.next().insert(0, "├── ")); while (iterator.hasNext()) { result.add(iterator.next().insert(0, "│ ")); } } private static void addLastSubtree(List result, List subtree) { Iterator iterator = subtree.iterator(); //subtree generated by renderDirectoryTreeLines has at least one line which is tree.getData() result.add(iterator.next().insert(0, "└── ")); while (iterator.hasNext()) { result.add(iterator.next().insert(0, " ")); } }
使用此输出：
DirectoryCatalog ├── .git │ ├── COMMIT_EDITMSG │ ├── config │ ├── description │ ├── HEAD │ ├── hooks │ │ ├── applypatch-msg.sample │ │ ├── commit-msg.sample │ │ ├── post-commit.sample │ │ ├── post-receive.sample │ │ ├── post-update.sample │ │ ├── pre-applypatch.sample │ │ ├── pre-commit.sample │ │ ├── pre-push.sample │ │ ├── pre-rebase.sample │ │ ├── prepare-commit-msg.sample │ │ └── update.sample │ ├── index │ ├── info │ │ └── exclude │ ├── logs │ │ ├── HEAD │ │ └── refs │ │ ├── heads │ │ │ └── master │ │ └── remotes │ │ └── origin │ │ └── master │ ├── objects │ │ ├── 0b │ │ │ └── b3fb0a15268c9770220938b1048305429527c7 │ │ ├── 0d │ │ │ └── e508f20f1cb44ff543cec54ea93a71e5e40d1d │ │ ├── 10 │ │ │ └── 9c753f3aab08f167f8409e6c9abec27cad6548 │ │ ├── 15 │ │ │ └── 7602556ebd120e656ae8dcd00cb361bfb3ef79 │ │ ├── 16 │ │ │ └── 952a5d1f5f3d15199f3e85b3d895a81990024e │ │ ├── 1c │ │ │ └── 5b36cd4d41b9b7d0df46d4184512098186c904 │ │ ├── 20 │ │ │ └── ae5cc82ebbb85f9161d8fd9783905e4cbee72c │ │ ├── 21 │ │ │ └── e42add0fb2205a75ff621dbeb6d76455816b79 │ │ ├── 23 │ │ │ └── af4eaa4007ca941e562406b7b329c6ba4b395e │ │ ├── 28 │ │ │ └── 6caf4b7be3ac85a476f3782220fe167a040971 │ │ ├── 2b │ │ │ └── f6743fb97162e999fb6429510bb8a52114bc31 │ │ ├── 35 │ │ │ └── acd4ab6acb599d4e3244be2a8dc3a0161bcb3c │ │ ├── 46 │ │ │ └── 1ef7c4db86e0466bb8f1f81dc25f12e3598db6 │ │ ├── 47 │ │ │ └── 4ce7f18330e5295ab1ef2eea66505235819e22 │ │ ├── 4b │ │ │ └── 825dc642cb6eb9a060e54bf8d69288fbee4904 │ │ ├── 4e │ │ │ └── 4e047c077c7825a845deebda7f97832cee847b │ │ ├── 4f │ │ │ └── 20b118269d71535e469966fdb5fe8a78ae6c9a │ │ ├── 51 │ │ │ └── 677b295b4cd9931354dd52fb6050015d524fea │ │ ├── 52 │ │ │ └── 9c34997d8262bd207037f0373703d68d4e1a4e │ │ ├── 5b │ │ │ └── 928f45816cc51609861f0930251accbe7de7f9 │ │ ├── 5d │ │ │ └── 7cdbe029c6eff99c72d09b0a81347b605e77d7 │ │ ├── 61 │ │ │ └── 2b9d86f6ac365ede894e13a6273fd13833f44f │ │ ├── 67 │ │ │ └── 2209cb240eac0303d6e3b6c7eb04242d661fad │ │ ├── 6b │ │ │ ├── c84e19913908f16141677b9d66abdb620350a0 │ │ │ └── d278b63be854ccd3c02b9038ee43366021b1a1 │ │ ├── 6c │ │ │ └── 9d10e91679988caaee6759d48daf336f28a9a3 │ │ ├── 70 │ │ │ └── 4284c78f1c664c1348af5a784cca55c51fd66a │ │ ├── 72 │ │ │ └── 1ab5fe4e4226930668048d97331103a92751be │ │ ├── 78 │ │ │ └── 64a41eaf50f32ae8d2cab1acd200c405215c1a │ │ ├── 82 │ │ │ └── 36f772feca12b3e301eea50774458a7e77c7fb │ │ ├── 83 │ │ │ └── bc1e2a1f3187f28d63d7fa334744810d80c20d │ │ ├── 87 │ │ │ └── 3ce97f624e9a1ae4a1bbf41218d50dc3503d6f │ │ ├── 8a │ │ │ └── 0b282aa6885fb573c106b3551f7275c5f17e8e │ │ ├── 91 │ │ │ └── a7e269e19dfc62e27137a0b57ef3e430cee4fd │ │ ├── 94 │ │ │ ├── 065a39b0dd7ce05604b96aff84d984493553e2 │ │ │ └── 5cbc994fb2d251437e71edf3a6eb289c5836ec │ │ ├── 95 │ │ │ └── f481326b62c9adff2a0dad47480e279adb518f │ │ ├── 9e │ │ │ └── 1f7de67de38e67479cb8e38ad92d6354838393 │ │ ├── a1 │ │ │ └── e385dff1fb08b7a45ea52af43b22d240f0adab │ │ ├── a7 │ │ │ └── 8934a5a81d95a85b9c97a3e1c1429186feb83d │ │ ├── ab │ │ │ └── 855c3379bdb3e4a22605de58f3438148d6ffe7 │ │ ├── b7 │ │ │ └── 64eafa2ba4e7f8f52a4e96da61b3d77f262d16 │ │ ├── bd │ │ │ └── 9374662b409bb364779212874e7cf611541c38 │ │ ├── c1 │ │ │ └── f858c163f9c8cb89a145a60e87c9e35c97fb93 │ │ ├── c3 │ │ │ └── 35d07a1078656646ca6e980b468b938106d357 │ │ ├── c5 │ │ │ └── ac562c59d6a0430fa0ccd1fa6318fa5d48604f │ │ ├── c8 │ │ │ └── f3d9284a65afbff6640da7970664ee2134c85b │ │ ├── c9 │ │ │ └── 7a8bdb9088d370da7e88784a7a093b971aa23a │ │ ├── cc │ │ │ └── a6a5141b614b5e351c7e5b6b677ef09a931786 │ │ ├── d1 │ │ │ └── 76229a9e1d0172f84d060904d171be51f9d0f6 │ │ ├── d3 │ │ │ ├── 2f0a1ba59a0c52d3acc62de1d624fb68423ee3 │ │ │ └── b9dfcb3216a2feab03b1ae96280e3c1c963953 │ │ ├── e0 │ │ │ └── 6d2081865a766a8668acc12878f98b27fc9ea0 │ │ ├── e5 │ │ │ └── 3106578cd8adcd085c5c63c05fc49d5a5a3dbb │ │ ├── info │ │ └── pack │ └── refs │ ├── heads │ │ └── master │ ├── remotes │ │ └── origin │ │ └── master │ └── tags ├── .gitattributes ├── .gitignore ├── .gradle │ └── 2.2.1 │ └── taskArtifacts │ ├── cache.properties │ ├── cache.properties.lock │ ├── fileHashes.bin │ ├── fileSnapshots.bin │ ├── outputFileStates.bin │ └── taskArtifacts.bin ├── .idea │ ├── .name │ ├── compiler.xml │ ├── copyright │ │ └── profiles_settings.xml │ ├── encodings.xml │ ├── gradle.xml │ ├── libraries │ │ ├── Gradle__commons_io_commons_io_2_4.xml │ │ ├── Gradle__junit_junit_4_11.xml │ │ └── Gradle__org_hamcrest_hamcrest_core_1_3.xml │ ├── misc.xml │ ├── modules.xml │ ├── scopes │ │ └── scope_settings.xml │ ├── uiDesigner.xml │ ├── vcs.xml │ └── workspace.xml ├── app │ ├── app.iml │ ├── build │ │ ├── classes │ │ │ └── main │ │ │ └── gq │ │ │ └── baijie │ │ │ └── catalog │ │ │ ├── controllor │ │ │ │ ├── FilesScanner$MyFileVisitor.class │ │ │ │ └── FilesScanner.class │ │ │ ├── entity │ │ │ │ └── FileInformation.class │ │ │ ├── Main.class │ │ │ └── util │ │ │ ├── FileAssert.class │ │ │ ├── Hash.class │ │ │ ├── HEX.class │ │ │ ├── Printer$1.class │ │ │ ├── Printer$DirectoryTreeRender.class │ │ │ ├── Printer.class │ │ │ └── TreeNode.class │ │ ├── dependency-cache │ │ ├── resources │ │ │ └── main │ │ └── tmp │ │ └── compileJava │ ├── build.gradle │ └── src │ ├── main │ │ └── java │ │ └── gq │ │ └── baijie │ │ └── catalog │ │ ├── controllor │ │ │ └── FilesScanner.java │ │ ├── entity │ │ │ └── FileInformation.java │ │ ├── Main.java │ │ └── util │ │ ├── FileAssert.java │ │ ├── Hash.java │ │ ├── HEX.java │ │ ├── Printer.java │ │ └── TreeNode.java │ └── test │ └── java ├── DirectoryCatalog.iml ├── gradle │ └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── LICENSE ├── README.md ├── settings.gradle └── temp ├── 150110161006.txt ├── 150110173453.txt ├── 150110175353.txt ├── 150111111311.txt ├── 150111112500.txt ├── 150111113411.txt ├── 150111155619.txt ├── 150111161958.txt ├── 150111162230.txt ├── 150111162632.txt ├── 150111163225.txt ├── 150111163330.txt ├── 150111164526.txt ├── 150111205412.txt ├── 150111210322.txt ├── 150111210506.txt ├── 150111210927.txt ├── 150111211249.txt ├── 150111211321.txt ├── 150111220750.txt ├── 150111220822.txt ├── 150111221437.txt ├── 150111221842.txt ├── 150111222437.txt ├── 150111234344.txt ├── 150111234433.txt └── 150112000034.txt
import java.io.File; public class MainEntry { public static void main(String[] args) { walkin(new File("/home/user")); //Replace this with a suitable directory } /** * Recursive function to descend into the directory tree and find all the files @param dir A file object defining the top directory **/ public static void walkin(File dir) { File listFile[] = dir.listFiles(); if (listFile != null) { for (int i=0; i
}
工作正常。逻辑是正确的
想想这样 –
procedure printOutput(file, depth): print "| " depth times; print "+---" + file name; print new line if(file is a directory): for(each file inside file, say innerFile): call printOutput(innerFile, depth + 1);
希望有所帮助。
import java.io.File; public class Tree { public static void main(String[] args) throws Exception { File folder = new File((args.length >= 1 && args[0].length() > 0) ? args[0] : "."); if (!folder.isDirectory()) { throw new IllegalArgumentException("Invalid directory: " + folder.getName()); } int level = 0; System.out.println(renderFolder(folder, level, new StringBuilder(), false)); } private static StringBuilder renderFolder(File folder, int level, StringBuilder sb, boolean isLast) { indent(sb, level, isLast).append("[D] ").append(folder.getName()).append("\n"); File[] objects = folder.listFiles(); for (int i = 0; i < objects.length; i++) { boolean last = ((i + 1) == objects.length); if (objects[i].isDirectory()) { renderFolder(objects[i], level + 1, sb, last); } else { renderFile(objects[i], level + 1, sb, last); } } return sb; } private static StringBuilder renderFile(File file, int level, StringBuilder sb, boolean isLast) { return indent(sb, level, isLast).append("--- ").append(file.getName()).append("\n"); } private static StringBuilder indent(StringBuilder sb, int level, boolean isLast) { for (int i = 1; i < level; i++) { sb.append("| "); } if (level > 0) { sb.append(isLast ? "`-" : "|-"); } return sb; } } [D] . |-[D] classes | |-[D] .data | | `---- Play.cdi_javac | |---- ArrayListTest$Pair.class | |---- ArrayListTest.class | |---- ArrayTest.class | |-[D] fruit | | |---- Apple.class | | `---- GrannySmith.class | |---- IfTest.class | |-[D] interview | | |---- Q1.class | | |---- Q2.class | | |---- Q3.class | | |---- Q3Sub.class | | |---- Q9Sub.class | | `---- Q9Super.class | |---- IntOverflowTest.class | |---- LinkedMapTest.class | |-[D] log | | `---- Logger.class | |---- log.properties | |---- StringCaseTest.class | |-[D] test | | |-[D] cache | | | |-[D] test1 | | | | |---- Cache.class | | | | |---- CacheEntry.class | | | | `---- RevisedCacheTest.class | | | |-[D] test2 | | | | |---- Cache.class | | | | |---- Log.class | | | | `---- RevisedCacheTest.class | | | `-[D] test3 | | | | |---- ConcurrentCache.class | | | | `---- ConcurrentCacheTest.class | | |---- Test.class | | `---- Test2.class | |---- Test.class | |---- Test2.class | `---- ZipTest.class `---- Play.jpr
这是我的解决方案：
import java.io.File; public class MostrarArbol { public static void main(String args[]) { File carpeta = new File(args[0]); // File carpeta = new File("."); if (!carpeta.exists()) { System.out.println(args[0] + " NO existe."); return; } imprimeArbol(carpeta, ""); } public static void imprimeArbol(File carpeta, String tabulador) { File contenido[] = carpeta.listFiles(); if (contenido != null) { for (int i = 0; i < contenido.length; i++) if (contenido[i].isDirectory()) { System.out.println(tabulador + "|-" + contenido[i].getName()); imprimeArbol(contenido[i], tabulador + "| "); } else { System.out.println(tabulador + "+-" + contenido[i].getName().toString()); } } } }
这是我的代码。 是工作
package DIRS; import java.io.File; public class LISTDIR { public static void main(String[] args) { String path = System.getProperty("user.dir")+File.separator; File file[] = new File(path).listFiles(); for(int i = 0 ; i < file.length ; i++) { if(file[i].isDirectory()) { System.out.println("->"+file[i].getName()); new LISTDIR().listfiles(file[i],"--"); } else { System.out.println("-> "+file[i].getName()); } } } public void listfiles(File f,String sprtr) { File file[] = f.listFiles(); for(int i = 0 ; i < file.length ; i++) { if(file[i].isDirectory()) { System.out.println(sprtr+file[i].getName()); new LISTDIR().listfiles(file[i],"--"+sprtr); } else { System.out.println(sprtr+file[i].getName()); } } } }