在Java中将字符串压缩为gzip

时间:2013-09-27 07:03:04

标签: java gzip gunzip

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();
}

当我将该字符串保存到文件中并在unix中运行gunzip -d file.txt时,它会抱怨:

gzip: gzip.gz: not in gzip format

3 个答案:

答案 0 :(得分:12)

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();
     }
  }
 }

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
}

答案 1 :(得分:3)

试试:

//...

String string = "string";

FileOutputStream fos = new FileOutputStream("filename.zip");

GZIPOutputStream gzos = new GZIPOutputStream(fos);
gzos.write(string.getBytes());
gzos.finish();

//...

答案 2 :(得分:0)

使用FileOutputStream

从out中保存字节
FileOutputStream fos = new FileOutputStream("gziptest.gz");
fos.write(out.toByteArray());
fos.close();

out.toString()似乎是可疑的,结果将是不可读的,如果你不在乎为什么不返回byte [],如果你关心它会看起来更好像hex或base64字符串。