使用Deflate压缩和解压缩字符串

Question

我需要压缩和解压缩字符串

这是代码:

public static byte[] ZipStr(String str)
{
    using (MemoryStream output = new MemoryStream())
    using (DeflateStream gzip = new DeflateStream(output, CompressionMode.Compress))
    using (StreamWriter writer = new StreamWriter(gzip))
       {
                writer.Write(str);
                return output.ToArray();
       }
}

和

public static string UnZipStr(byte[] input)
{
    using (MemoryStream inputStream = new MemoryStream(input))
    using (DeflateStream gzip = new DeflateStream(inputStream, CompressionMode.Decompress))
    using (StreamReader reader = new StreamReader(gzip))
       {
        reader.ReadToEnd();
        return System.Text.Encoding.UTF8.GetString(inputStream.ToArray());
       }
}

似乎UnZipStr方法中存在错误.有人能帮助我吗？

Answer 1

有两个不同的问题.首先,ZipStr你需要冲洗或关闭StreamWriter并关闭DeflateStream之前从中读取MemoryStream.

其次,在UnZipStr,你正在从压缩的字节构造你的结果字符串inputStream.你应该返回结果reader.ReadToEnd().

在StreamWriter和 StreamReader构造函数中指定字符串编码也是一个好主意.

请尝试以下代码:

public static byte[] ZipStr(String str)
{
    using (MemoryStream output = new MemoryStream())
    {
        using (DeflateStream gzip = 
          new DeflateStream(output, CompressionMode.Compress))
        {
            using (StreamWriter writer = 
              new StreamWriter(gzip, System.Text.Encoding.UTF8))
            {
                writer.Write(str);           
            }
        }

        return output.ToArray();
    }
}

public static string UnZipStr(byte[] input)
{
    using (MemoryStream inputStream = new MemoryStream(input))
    {
        using (DeflateStream gzip = 
          new DeflateStream(inputStream, CompressionMode.Decompress))
        {
            using (StreamReader reader = 
              new StreamReader(gzip, System.Text.Encoding.UTF8))
            {
                return reader.ReadToEnd();
            }
        }
    }
}