在 Java 中解压导致“java.util.zip.ZipException"的 zip 文件;- 无效的 LOC 标头(错误的签名) [英] Unpacking zip files in Java that cause a "java.util.zip.ZipException" - invalid LOC header (bad signature)
问题描述
我有一个 zip 文件(从 ownCloud 实例下载)并且无法使用 Java 库(Java 版本1.8.0_66")解压) 来自 java.util.zip.如果我尝试这样做,则会引发以下异常:
I have a zip file (that is downloaded from an ownCloud instance) and can not be unpacked using the Java libraries (java version "1.8.0_66") from java.util.zip. If I try to do so, the following exception is thrown:
java.util.zip.ZipException:无效的 LOC 标头(错误签名)
当发出 Linux 'file' 命令时,它输出以下内容:
When issuing a Linux 'file' command, it outputs the following:
so-example.zip:压缩存档数据,至少要解压 v3.0
经过反复试验后我发现,那些应该可以通过v2.0"解压缩的文件,可以被 Java 处理而没有任何问题.
After some trial and error I found out, that files, that are supposed to be unzippable by "v2.0", can be processed by Java without any issues.
用于解包的代码的最小示例如下:
A minimal example for the code used for unpacking is the following:
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
public class PlaygroundZip{
public static void main(String[] args) {
String filename = "/tmp/so-example.zip";
byte[] buffer = new byte[1024];
try {
ZipFile zipFile = new ZipFile(filename);
Enumeration entries = zipFile.entries();
while(entries.hasMoreElements()) {
ZipEntry entry = (ZipEntry)entries.nextElement();
String currName = entry.getName();
System.out.println("File: " + currName);
if(entry.isDirectory()) {
new File(currName).mkdirs();
} else{
InputStream zis = zipFile.getInputStream(entry);
FileOutputStream fos = new FileOutputStream(currName);
int len;
while ((len = zis.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
fos.close();
}
}
zipFile.close();
} catch (IOException ioe) {
System.err.println("Unhandled exception:");
ioe.printStackTrace();
}
}
}
如何使用标准 Java 库或任何其他方法处理这些文件?
How can I process these files with standard Java libraries or any other method?
推荐答案
到目前为止,我发现解压这些文件的唯一方法是使用系统命令并使用unzip"命令行工具(Ubuntu 12.04 LTS,解压缩 6.00).由于这是在服务器应用程序中使用的,因此它是一种可以接受的 hack,即使远非优雅.
The only way to unpack those files, I have found so far, is using a system command and use the "unzip" command line tool (Ubuntu 12.04 LTS, UnZip 6.00). As this is used in a server application it would be an acceptable hack, even though far away from being elegant.
Process p = Runtime.getRuntime().exec("unzip " + filename + " -d /tmp/mydir");
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