Java:创建 GZIPInputStream 时出错:不是 GZIP 格式

Question

我正在尝试使用以下 Java 代码来压缩和解压缩字符串。但是从新的 ByteArrayInputStream 对象创建新的 GZipInputStream 对象的行抛出“java.util.zip.ZipException:不是 GZIP 格式”异常。有谁知道如何解决这个问题？

        String orig = ".............";

        // compress it
        ByteArrayOutputStream baostream = new ByteArrayOutputStream();
        OutputStream outStream = new GZIPOutputStream(baostream);
        outStream.write(orig.getBytes());
        outStream.close();
        String compressedStr = baostream.toString();

        // uncompress it
        InputStream inStream = new GZIPInputStream(new ByteArrayInputStream(compressedStr.getBytes()));
        ByteArrayOutputStream baoStream2 = new ByteArrayOutputStream();
        byte[] buffer = new byte[8192];
        int len;
        while((len = inStream.read(buffer))>0)
            baoStream2.write(buffer, 0, len);
        String uncompressedStr = baoStream2.toString();

Answer 1

混合 String 和 byte[]；那永远不合适。并且只适用于具有相同编码的相同操作系统。并非每个 byte[] 都可以转换为 String，并且转换回来可以得到其他字节。

compressedBytes 不需要代表字符串。

在getBytes 和new String 中显式设置编码。

    String orig = ".............";

    // Compress it
    ByteArrayOutputStream baostream = new ByteArrayOutputStream();
    OutputStream outStream = new GZIPOutputStream(baostream);
    outStream.write(orig.getBytes("UTF-8"));
    outStream.close();
    byte[] compressedBytes = baostream.toByteArray(); // toString not always possible

    // Uncompress it
    InputStream inStream = new GZIPInputStream(
            new ByteArrayInputStream(compressedBytes));
    ByteArrayOutputStream baoStream2 = new ByteArrayOutputStream();
    byte[] buffer = new byte[8192];
    int len;
    while ((len = inStream.read(buffer)) > 0) {
        baoStream2.write(buffer, 0, len);
    }
    String uncompressedStr = baoStream2.toString("UTF-8");

    System.out.println("orig: " + orig);
    System.out.println("unc:  " + uncompressedStr);