假设我有一个文件t.txt，一个目录t和另一个文件t / t2.txt。如果我使用linux zip实用程序“zip -r t.zip t.txt t”，我会得到一个zip文件，其中包含以下条目（unzip -l t.zip）：
Archive: t.zip
Length Date Time Name
-------- ---- ---- ----
9 04-11-09 09:11 t.txt
0 04-11-09 09:12 t/
15 04-11-09 09:12 t/t2.txt
-------- -------
24 3 files
如果我尝试使用java.util.zip.ZipOutputStream复制该行为并为该目录创建zip条目，则java会抛出异常。它只能处理文件。我可以在zip文件中创建一个t / t2.txt条目，并添加使用t2.txt文件内容但我无法创建目录。那是为什么？
答案 0 :(得分：41)
ZipOutputStream 可以通过在文件夹名称后添加正斜杠/来处理空目录。试试（from）
public class Test {
public static void main(String[] args) {
try {
FileOutputStream f = new FileOutputStream("test.zip");
ZipOutputStream zip = new ZipOutputStream(new BufferedOutputStream(f));
zip.putNextEntry(new ZipEntry("xml/"));
zip.putNextEntry(new ZipEntry("xml/xml"));
zip.close();
} catch(Exception e) {
System.out.println(e.getMessage());
}
}
}
答案 1 :(得分：22)
只需浏览java.util.zip.ZipEntry的源代码即可。如果ZipEntry的名称以“/”字符结尾，则将其视为目录。只需在目录名后加上“/".
检查此示例是否只压缩空目录， http://bethecoder.com/applications/tutorials/showTutorials.action?tutorialId=Java_ZipUtilities_ZipEmptyDirectory
祝你好运。答案 2 :(得分：13)
像其他人一样说这里添加空目录添加“/”到目录名。 注意不要添加File.separator（等于“\”），它实际上会向zip添加一个空文件。
我花了一段时间才明白我的错误是什么 - 希望我能节省一些时间......
答案 3 :(得分：12)
Zip程序的Java程序（文件夹包含空的或完整的）
public class ZipUsingJavaUtil {
/*
* Zip function zip all files and folders
*/
@Override
@SuppressWarnings("finally")
public boolean zipFiles(String srcFolder, String destZipFile) {
boolean result = false;
try {
System.out.println("Program Start zipping the given files");
/*
* send to the zip procedure
*/
zipFolder(srcFolder, destZipFile);
result = true;
System.out.println("Given files are successfully zipped");
} catch (Exception e) {
System.out.println("Some Errors happned during the zip process");
} finally {
return result;
}
}
/*
* zip the folders
*/
private void zipFolder(String srcFolder, String destZipFile) throws Exception {
ZipOutputStream zip = null;
FileOutputStream fileWriter = null;
/*
* create the output stream to zip file result
*/
fileWriter = new FileOutputStream(destZipFile);
zip = new ZipOutputStream(fileWriter);
/*
* add the folder to the zip
*/
addFolderToZip("", srcFolder, zip);
/*
* close the zip objects
*/
zip.flush();
zip.close();
}
/*
* recursively add files to the zip files
*/
private void addFileToZip(String path, String srcFile, ZipOutputStream zip, boolean flag) throws Exception {
/*
* create the file object for inputs
*/
File folder = new File(srcFile);
/*
* if the folder is empty add empty folder to the Zip file
*/
if (flag == true) {
zip.putNextEntry(new ZipEntry(path + "/" + folder.getName() + "/"));
} else { /*
* if the current name is directory, recursively traverse it
* to get the files
*/
if (folder.isDirectory()) {
/*
* if folder is not empty
*/
addFolderToZip(path, srcFile, zip);
} else {
/*
* write the file to the output
*/
byte[] buf = new byte[1024];
int len;
FileInputStream in = new FileInputStream(srcFile);
zip.putNextEntry(new ZipEntry(path + "/" + folder.getName()));
while ((len = in.read(buf)) > 0) {
/*
* Write the Result
*/
zip.write(buf, 0, len);
}
}
}
}
/*
* add folder to the zip file
*/
private void addFolderToZip(String path, String srcFolder, ZipOutputStream zip) throws Exception {
File folder = new File(srcFolder);
/*
* check the empty folder
*/
if (folder.list().length == 0) {
System.out.println(folder.getName());
addFileToZip(path, srcFolder, zip, true);
} else {
/*
* list the files in the folder
*/
for (String fileName : folder.list()) {
if (path.equals("")) {
addFileToZip(folder.getName(), srcFolder + "/" + fileName, zip, false);
} else {
addFileToZip(path + "/" + folder.getName(), srcFolder + "/" + fileName, zip, false);
}
}
}
}
}
答案 4 :(得分：7)
您可以在文件夹名称的末尾添加“/”。只需使用以下命令：
zip.putNextEntry(new ZipEntry("xml/"));
答案 5 :(得分：0)
String dir =“ E：\ Infor \ Marketing \ JobLog \ Cloud_MomBuild_NoMirror”;
public void downloadAsZip() throws IOException {
ByteArrayOutputStream byteOutputStream = new ByteArrayOutputStream();
ZipOutputStream zipOutputStream = new ZipOutputStream(byteOutputStream);
Path folderPath = Paths.get(dir);
String folderName = "Output";
for (File file : folderPath.toFile().listFiles()) {
String path = folderName + "/" + file.getName();
if (file.isDirectory()) {
writeFolderToZip(zipOutputStream, file, path);
} else {
writeFileToZip(zipOutputStream, file, path);
}
}
}
public void writeFileToZip(ZipOutputStream zipOutputStream, File file, String path) throws IOException {
zipOutputStream.putNextEntry(new ZipEntry(path));
FileInputStream fileInputStream = new FileInputStream(file);
IOUtils.copy(fileInputStream, zipOutputStream);
fileInputStream.close();
zipOutputStream.closeEntry();
}
public void writeFolderToZip(ZipOutputStream zipOutputStream, File dir, String path) throws IOException {
for (File file : dir.listFiles()) {
String dirPath = path + "/" + file.getName();
if (file.isDirectory()) {
writeFolderToZip(zipOutputStream, file, dirPath);
} else {
writeFileToZip(zipOutputStream, file, dirPath);
}
}
}