在 Java 中将字符串压缩为 gzip
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Compress a string to gzip in Java
提问by kelorek
public static String compressString(String str) throws IOException{
if (str == null || str.length() == 0) {
return str;
}
ByteArrayOutputStream out = new ByteArrayOutputStream();
GZIPOutputStream gzip = new GZIPOutputStream(out);
gzip.write(str.getBytes());
gzip.close();
Gdx.files.local("gziptest.gzip").writeString(out.toString(), false);
return out.toString();
}
When I save that string to a file, and run gunzip -d file.txtin unix, it complains:
当我将该字符串保存到文件中并gunzip -d file.txt在 unix 中运行时，它会抱怨：
gzip: gzip.gz: not in gzip format
采纳答案by Maxim Shoustin
Try to use BufferedWriter
尝试使用 BufferedWriter
public static String compressString(String str) throws IOException{
if (str == null || str.length() == 0) {
return str;
}
BufferedWriter writer = null;
try{
File file = new File("your.gzip")
GZIPOutputStream zip = new GZIPOutputStream(new FileOutputStream(file));
writer = new BufferedWriter(new OutputStreamWriter(zip, "UTF-8"));
writer.append(str);
}
finally{
if(writer != null){
writer.close();
}
}
}
About your code example try:
关于您的代码示例，请尝试：
public static String compressString(String str) throws IOException{
if (str == null || str.length() == 0) {
return str;
}
ByteArrayOutputStream out = new ByteArrayOutputStream(str.length());
GZIPOutputStream gzip = new GZIPOutputStream(out);
gzip.write(str.getBytes());
gzip.close();
byte[] compressedBytes = out.toByteArray();
Gdx.files.local("gziptest.gzip").writeBytes(compressedBytes, false);
out.close();
return out.toString(); // I would return compressedBytes instead String
}
回答by Maxim Shoustin
Try that :
试试看：
//...
String string = "string";
FileOutputStream fos = new FileOutputStream("filename.zip");
GZIPOutputStream gzos = new GZIPOutputStream(fos);
gzos.write(string.getBytes());
gzos.finish();
//...
回答by Evgeniy Dorofeev
Save bytes from out with FileOutputStream
使用 FileOutputStream 从 out 中保存字节
FileOutputStream fos = new FileOutputStream("gziptest.gz");
fos.write(out.toByteArray());
fos.close();
out.toString() seems suspicious, the result will be unreadable, if you dont care then why not to return byte[], if you do care it would look better as hex or base64 string.
out.toString() 看起来很可疑，结果将是不可读的，如果你不关心那么为什么不返回 byte[]，如果你关心它会更好看作为十六进制或 base64 字符串。
