GzipStream流读写压缩数据！

淡淡的烟草味﹌ 2022-05-27 22:28 256阅读 0赞

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.IO;
    using System.IO.Compression;
    
    namespace ConsoleApplication21
    {
        class Program
        {   //写入解压流
            static void SaveCompressedFile(string filename, string data)
            {
                FileStream fileStream = new FileStream(filename, FileMode.Create, FileAccess.Write);
                GZipStream compresssionStream = new GZipStream(fileStream, CompressionMode.Compress);
                StreamWriter writer = new StreamWriter(compresssionStream);
                writer.Write(data);
                writer.Close();
            }
            static string LoadCompressedFile(string filename)
            {   //读解压流
                FileStream fileStream = new FileStream(filename, FileMode.Open, FileAccess.Read);
                GZipStream compressionStream = new GZipStream(fileStream, CompressionMode.Decompress);
                StreamReader reader = new StreamReader(compressionStream);
                string data = reader.ReadToEnd();
                reader.Close();
                return data;
    
    
            }
            
            static void Main(string[] args)
            {
                try
                {
                    string filename = "ceshi.txt";
                    Console.WriteLine("请输入一个字符串进行压缩（会复制100次该字符串后再进行压缩！）:");
                    string sourceString = Console.ReadLine();
                    StringBuilder sourceStringMutiplier = new StringBuilder(sourceString.Length * 100);
                    for (int i = 0; i < 100; i++)
                    {
                        sourceStringMutiplier.Append(sourceString);
                    }
                    sourceString = sourceStringMutiplier.ToString();
                    Console.WriteLine("原数据有个 {0} 字节", sourceString.Length);
                    SaveCompressedFile(filename, sourceString);
                    Console.WriteLine("\n数据保存到 {0} ", filename);
                    FileInfo compressedFileData = new FileInfo(filename);
                    Console.WriteLine("压缩后的文件有个 {0} 字节", compressedFileData.Length);
                    string recoveredString = LoadCompressedFile(filename);
                    recoveredString = recoveredString.Substring(0, recoveredString.Length / 100);
                    Console.WriteLine("\n恢复后的数据是： {0} ",recoveredString);
                    Console.ReadKey();
                }
                catch(IOException ex)
                {
                    Console.WriteLine("一个IO异常已经抛出！");
                    Console.WriteLine(ex.ToString());
                    Console.ReadKey();
                }
            }

上面测试的结果为，压缩比例为10:1，输入不同的字符串会有不同的压缩比例，好真不好说这种压缩方法的优势与缺陷。