[英]Java GzipInputStream into DataInputStream
I have a problem with GZip in Java. 我在Java中遇到GZip问题。 Currently i work with files that are gzipped.
目前,我正在处理压缩文件。 One file in one gzip archive.
一个gzip存档中的一个文件。 And if i decompress them manually and then parse them everything works.
如果我手动解压缩它们,然后解析它们,则一切正常。 But i want to automate this with Java and GZipInputStream but it doesn't work.
但是我想用Java和GZipInputStream自动化它,但是不起作用。 I need to have DataInputStream at the end.
我需要在末尾有DataInputStream。 My code is:
我的代码是:
byte[] bytesArray = Files.readAllBytes(baseFile.toPath());
try {
reader = new DataInputStream(new GZIPInputStream(new ByteArrayInputStream(bytesArray)));
System.out.println("gzip");
} catch (ZipException notZip) {
reader = new DataInputStream(new ByteArrayInputStream(bytesArray));
System.out.println("no gzip");
}
I also tried new GZIPInputStream(new FileInputStream(baseFile)); 我还尝试了new GZIPInputStream(new FileInputStream(baseFile)); The result is the same.
结果是一样的。 Due to output i see that Gzip stream creates without exception but later i get invalid data from DataInputStream.
由于输出,我看到Gzip流毫无例外地创建,但是后来我从DataInputStream获取了无效数据。 Please help :)
请帮忙 :)
I ran the following code without problems 我运行以下代码没有问题
public static void main(String[] args) throws IOException {
byte[] originalBytesArray = Files.readAllBytes(new File("OrdLog.BR-1.17.2016-09-12.bin").toPath());
byte[] bytesArray = Files.readAllBytes(new File("OrdLog.BR-1.17.2016-09-12.bin.gz").toPath());
DataInputStream reader = null;
try {
reader = new DataInputStream(new GZIPInputStream(new ByteArrayInputStream(bytesArray)));
System.out.println("gzip");
} catch (ZipException notZip) {
reader = new DataInputStream(new ByteArrayInputStream(bytesArray));
System.out.println("no gzip");
}
byte[] uncompressedBytesArray = new byte[originalBytesArray.length];
reader.readFully(uncompressedBytesArray);
reader.close();
boolean filesDiffer = false;
for (int i = 0; i < uncompressedBytesArray.length; i++) {
if (originalBytesArray[i] != uncompressedBytesArray[i]) {
filesDiffer = true;
}
}
System.out.println("Files differ: " + filesDiffer);
}
It reads the gzip file and the uncompressed file and compares the content. 它读取gzip文件和未压缩的文件并比较内容。 It prints Files differ: false.
它打印文件不同:false。 If it doesn't for your files than the files are not the same.
如果不是您的文件,则文件不相同。
My final solution: 我的最终解决方案:
try {
byte[] gzipBytes = new byte[getUncompressedFileSize()];
new DataInputStream(new GZIPInputStream(new FileInputStream(baseFile))).readFully(gzipBytes);
reader = new DataInputStream(new ByteArrayInputStream(gzipBytes));
} catch (ZipException notZip) {
byte[] bytesArray = Files.readAllBytes(baseFile.toPath());
reader = new DataInputStream(new ByteArrayInputStream(bytesArray));
}
private int getUncompressedFileSize() throws IOException {
//last 4 bytes of file is size of original file if it is less than 2GB
RandomAccessFile raf = new RandomAccessFile(baseFile, "r");
raf.seek(raf.length() - 4);
int b4 = raf.read();
int b3 = raf.read();
int b2 = raf.read();
int b1 = raf.read();
int val = (b1 << 24) | (b2 << 16) + (b3 << 8) + b4;
raf.close();
return val;
}
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