是否有适用于 LZ4 和 ZStd 的最佳 Java 压缩库。我尝试过使用 apache commons(这是 zstd-jni 实现)
String fileURL = TestFileUtil.getFileURL(TestFileCategory.SMALL);
String outputFileName = TestFileUtil.BASE_DIR+"/zstd-"+(Math.random()*10)+".x";
System.out.println(Paths.get(fileURL));
printFileInfo(fileURL);
StopWatch watch = new StopWatch();
InputStream in = Files.newInputStream(Paths.get(fileURL));
OutputStream fout = Files.newOutputStream(Paths.get(outputFileName));
BufferedOutputStream out = new BufferedOutputStream(fout);
ZstdCompressorOutputStream zOut = new ZstdCompressorOutputStream(out);
int buffersize = 1024*4;
watch.mark();
final byte[] buffer = new byte[buffersize];
int n = 0;
while (-1 != (n = in.read(buffer))) {
zOut.write(buffer, 0, n);
}
zOut.close();
in.close();
但是这段代码不起作用它会抛出
Exception in thread "main" java.lang.NoClassDefFoundError: com/github/luben/zstd/ZstdOutputStream
at org.apache.commons.compress.compressors.zstandard.ZstdCompressorOutputStream.<init>(ZstdCompressorOutputStream.java:83)
at com.zoho.test.testzstd.main(testzstd.java:28)
Caused by: java.lang.ClassNotFoundException: com.github.luben.zstd.ZstdOutputStream
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 2 more
对于 LZ4,我只需将 ZStdCompressorOutputStream 替换为
FramedLZ4CompressorOutputStream lzOut = new FramedLZ4CompressorOutputStream(out);
但是压缩 2.4GB (csv) 文件需要将近 2 小时(尚未完成)。代码有什么问题吗?或任何其他建议?