[英]java.util.zip - Recreating directory structure
在嘗試使用java.util.zip
壓縮存檔時,我遇到了很多問題,我解決了大部分問題。 現在我終於得到了一些輸出,我很難獲得“正確”的輸出。 我有一個提取的ODT文件(目錄將更符合描述)我做了一些修改。 現在我想壓縮該目錄以重新創建ODT文件結構。 壓縮目錄並將其重命名為.odt結束工作正常,所以應該沒有問題。
主要問題是我丟失了目錄的內部結構。 一切都變得“平坦”,我似乎找不到保留原始多層結構的方法。 我希望得到一些幫助,因為我似乎無法找到問題。
以下是相關的代碼段:
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
FILEPATH.substring(0, FILEPATH.lastIndexOf(SEPARATOR) + 1).concat("test.zip")));
compressDirectory(TEMPARCH, out);
SEPARATOR
是系統文件分隔符, FILEPATH
是原始ODT的文件路徑,我將覆蓋但尚未在此處進行測試。 我只是寫入同一目錄中的test.zip文件。
private void compressDirectory(String directory, ZipOutputStream out) throws IOException
{
File fileToCompress = new File(directory);
// list contents.
String[] contents = fileToCompress.list();
// iterate through directory and compress files.
for(int i = 0; i < contents.length; i++)
{
File f = new File(directory, contents[i]);
// testing type. directories and files have to be treated separately.
if(f.isDirectory())
{
// add empty directory
out.putNextEntry(new ZipEntry(f.getName() + SEPARATOR));
// initiate recursive call
compressDirectory(f.getPath(), out);
// continue the iteration
continue;
}else{
// prepare stream to read file.
FileInputStream in = new FileInputStream(f);
// create ZipEntry and add to outputting stream.
out.putNextEntry(new ZipEntry(f.getName()));
// write the data.
int len;
while((len = in.read(data)) > 0)
{
out.write(data, 0, len);
}
out.flush();
out.closeEntry();
in.close();
}
}
}
包含要壓縮文件的目錄位於用戶空間中的某個位置,而不是與生成的文件位於同一目錄中。 我認為這可能是麻煩但我不知道如何。 此外,我認為問題可能是使用相同的流輸出,但我再也看不出如何。 我在一些示例和教程中看到他們使用getPath()
而不是getName()
但是更改它會給我一個空的zip文件。
URI類對於處理相對路徑很有用。
File mydir = new File("C:\\mydir");
File myfile = new File("C:\\mydir\\path\\myfile.txt");
System.out.println(mydir.toURI().relativize(myfile.toURI()).getPath());
上面的代碼將發出字符串path/myfile.txt
。
為了完整起見,這是一個用於歸檔目錄的zip
方法:
public static void zip(File directory, File zipfile) throws IOException {
URI base = directory.toURI();
Deque<File> queue = new LinkedList<File>();
queue.push(directory);
OutputStream out = new FileOutputStream(zipfile);
Closeable res = out;
try {
ZipOutputStream zout = new ZipOutputStream(out);
res = zout;
while (!queue.isEmpty()) {
directory = queue.pop();
for (File kid : directory.listFiles()) {
String name = base.relativize(kid.toURI()).getPath();
if (kid.isDirectory()) {
queue.push(kid);
name = name.endsWith("/") ? name : name + "/";
zout.putNextEntry(new ZipEntry(name));
} else {
zout.putNextEntry(new ZipEntry(name));
copy(kid, zout);
zout.closeEntry();
}
}
}
} finally {
res.close();
}
}
這段代碼不會保留日期,我不確定它會如何對符號鏈接這樣的東西做出反應。 不嘗試添加目錄條目,因此不會包含空目錄。
相應的unzip
命令:
public static void unzip(File zipfile, File directory) throws IOException {
ZipFile zfile = new ZipFile(zipfile);
Enumeration<? extends ZipEntry> entries = zfile.entries();
while (entries.hasMoreElements()) {
ZipEntry entry = entries.nextElement();
File file = new File(directory, entry.getName());
if (entry.isDirectory()) {
file.mkdirs();
} else {
file.getParentFile().mkdirs();
InputStream in = zfile.getInputStream(entry);
try {
copy(in, file);
} finally {
in.close();
}
}
}
}
他們依賴的實用方法:
private static void copy(InputStream in, OutputStream out) throws IOException {
byte[] buffer = new byte[1024];
while (true) {
int readCount = in.read(buffer);
if (readCount < 0) {
break;
}
out.write(buffer, 0, readCount);
}
}
private static void copy(File file, OutputStream out) throws IOException {
InputStream in = new FileInputStream(file);
try {
copy(in, out);
} finally {
in.close();
}
}
private static void copy(InputStream in, File file) throws IOException {
OutputStream out = new FileOutputStream(file);
try {
copy(in, out);
} finally {
out.close();
}
}
緩沖區大小完全是任意的。
我在你的代碼中看到了2個問題,
我提供自己的版本供您參考。 我們使用這個來壓縮照片下載所以它適用於各種解壓縮程序。 它保留了目錄結構和時間戳。
public static void createZipFile(File srcDir, OutputStream out,
boolean verbose) throws IOException {
List<String> fileList = listDirectory(srcDir);
ZipOutputStream zout = new ZipOutputStream(out);
zout.setLevel(9);
zout.setComment("Zipper v1.2");
for (String fileName : fileList) {
File file = new File(srcDir.getParent(), fileName);
if (verbose)
System.out.println(" adding: " + fileName);
// Zip always use / as separator
String zipName = fileName;
if (File.separatorChar != '/')
zipName = fileName.replace(File.separatorChar, '/');
ZipEntry ze;
if (file.isFile()) {
ze = new ZipEntry(zipName);
ze.setTime(file.lastModified());
zout.putNextEntry(ze);
FileInputStream fin = new FileInputStream(file);
byte[] buffer = new byte[4096];
for (int n; (n = fin.read(buffer)) > 0;)
zout.write(buffer, 0, n);
fin.close();
} else {
ze = new ZipEntry(zipName + '/');
ze.setTime(file.lastModified());
zout.putNextEntry(ze);
}
}
zout.close();
}
public static List<String> listDirectory(File directory)
throws IOException {
Stack<String> stack = new Stack<String>();
List<String> list = new ArrayList<String>();
// If it's a file, just return itself
if (directory.isFile()) {
if (directory.canRead())
list.add(directory.getName());
return list;
}
// Traverse the directory in width-first manner, no-recursively
String root = directory.getParent();
stack.push(directory.getName());
while (!stack.empty()) {
String current = (String) stack.pop();
File curDir = new File(root, current);
String[] fileList = curDir.list();
if (fileList != null) {
for (String entry : fileList) {
File f = new File(curDir, entry);
if (f.isFile()) {
if (f.canRead()) {
list.add(current + File.separator + entry);
} else {
System.err.println("File " + f.getPath()
+ " is unreadable");
throw new IOException("Can't read file: "
+ f.getPath());
}
} else if (f.isDirectory()) {
list.add(current + File.separator + entry);
stack.push(current + File.separator + f.getName());
} else {
throw new IOException("Unknown entry: " + f.getPath());
}
}
}
}
return list;
}
}
只需瀏覽java.util.zip.ZipEntry的源代碼即可。 如果ZipEntry的名稱以“/”字符結尾,則將其視為目錄。 只需在目錄名后加上“/”。 您還需要刪除驅動器前綴以使其相對。
檢查此示例只是為了壓縮空目錄,
只要您能夠在ZIP文件中創建空目錄和非空目錄,您的目錄結構就完好無損。
祝好運。
這是另一個示例(遞歸),它還允許您從zip包含/排除包含文件夾:
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
public class ZipUtil {
private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
public static void main(String[] args) throws Exception {
zipFile("C:/tmp/demo", "C:/tmp/demo.zip", true);
}
public static void zipFile(String fileToZip, String zipFile, boolean excludeContainingFolder)
throws IOException {
ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(zipFile));
File srcFile = new File(fileToZip);
if(excludeContainingFolder && srcFile.isDirectory()) {
for(String fileName : srcFile.list()) {
addToZip("", fileToZip + "/" + fileName, zipOut);
}
} else {
addToZip("", fileToZip, zipOut);
}
zipOut.flush();
zipOut.close();
System.out.println("Successfully created " + zipFile);
}
private static void addToZip(String path, String srcFile, ZipOutputStream zipOut)
throws IOException {
File file = new File(srcFile);
String filePath = "".equals(path) ? file.getName() : path + "/" + file.getName();
if (file.isDirectory()) {
for (String fileName : file.list()) {
addToZip(filePath, srcFile + "/" + fileName, zipOut);
}
} else {
zipOut.putNextEntry(new ZipEntry(filePath));
FileInputStream in = new FileInputStream(srcFile);
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
int len;
while ((len = in.read(buffer)) != -1) {
zipOut.write(buffer, 0, len);
}
in.close();
}
}
}
如果您不想打擾處理字節輸入流,緩沖區大小和其他低級別詳細信息。 您可以使用Java代碼中的Ant的Zip庫(可以在此處找到maven依賴項)。 現在我創建一個包含文件和目錄列表的zip:
public static void createZip(File zipFile, List<String> fileList) {
Project project = new Project();
project.init();
Zip zip = new Zip();
zip.setDestFile(zipFile);
zip.setProject(project);
for(String relativePath : fileList) {
//noramalize the path (using commons-io, might want to null-check)
String normalizedPath = FilenameUtils.normalize(relativePath);
//create the file that will be used
File fileToZip = new File(normalizedPath);
if(fileToZip.isDirectory()) {
ZipFileSet fileSet = new ZipFileSet();
fileSet.setDir(fileToZip);
fileSet.setPrefix(fileToZip.getPath());
zip.addFileset(fileSet);
} else {
FileSet fileSet = new FileSet();
fileSet.setDir(new File("."));
fileSet.setIncludes(normalizedPath);
zip.addFileset(fileSet);
}
}
Target target = new Target();
target.setName("ziptarget");
target.addTask(zip);
project.addTarget(target);
project.executeTarget("ziptarget");
}
我想在這里添加一個建議/提醒:
如果您將輸出目錄定義為與輸入目錄相同,則需要將每個文件的名稱與輸出.zip的文件名進行比較,以避免壓縮文件本身,從而產生一些不需要的行為。 希望這有任何幫助。
要在Windows中壓縮文件夾及其子文件夾的內容,
更換,
out.putNextEntry(new ZipEntry(files[i]));
同
out.putNextEntry(new ZipEntry(files[i]).replace(inFolder+"\\,""));
這段代碼剪輯對我有用。 不需要第三方庫。
public static void zipDir(final Path dirToZip, final Path out) {
final Stack<String> stackOfDirs = new Stack<>();
final Function<Stack<String>, String> createPath = stack -> stack.stream().collect(Collectors.joining("/")) + "/";
try(final ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(out.toFile()))) {
Files.walkFileTree(dirToZip, new FileVisitor<Path>() {
@Override
public FileVisitResult preVisitDirectory(final Path dir, final BasicFileAttributes attrs) throws IOException {
stackOfDirs.push(dir.toFile().getName());
final String path = createPath.apply(stackOfDirs);
final ZipEntry zipEntry = new ZipEntry(path);
zipOut.putNextEntry(zipEntry);
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {
final String path = String.format("%s%s", createPath.apply(stackOfDirs), file.toFile().getName());
final ZipEntry zipEntry = new ZipEntry(path);
zipOut.putNextEntry(zipEntry);
Files.copy(file, zipOut);
zipOut.closeEntry();
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFileFailed(final Path file, final IOException exc) throws IOException {
final StringWriter stringWriter = new StringWriter();
try(final PrintWriter printWriter = new PrintWriter(stringWriter)) {
exc.printStackTrace(printWriter);
System.err.printf("Failed visiting %s because of:\n %s\n",
file.toFile().getAbsolutePath(), printWriter.toString());
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(final Path dir, final IOException exc) throws IOException {
stackOfDirs.pop();
return FileVisitResult.CONTINUE;
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
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