Java /C# 实现文件压缩

纯粹为了记录。

参考了

https://www.cnblogs.com/zeng1994/p/7862288.html

import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
         * 压缩成ZIP 方法1
         * @param srcDir 压缩文件夹路径
         * @param out    压缩文件输出流
         * @param KeepDirStructure  是否保留原来的目录结构,true:保留目录结构;
         *                          false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
         * @throws RuntimeException 压缩失败会抛出运行时异常
         */
        public static void toZip(String srcDir, OutputStream out, boolean KeepDirStructure)
                throws RuntimeException{
            long start = System.currentTimeMillis();
            ZipOutputStream zos = null ;
            try {
                zos = new ZipOutputStream(out);
                File sourceFile = new File(srcDir);
                compress(sourceFile,zos,sourceFile.getName(),KeepDirStructure);
                long end = System.currentTimeMillis();
                System.out.println("压缩完成，耗时：" + (end - start) +" ms");
            } catch (Exception e) {
                throw new RuntimeException("zip error from ZipUtils",e);
            }finally{
                if(zos != null){
                    try {
                        zos.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }

    /**
         * 压缩成ZIP 方法2
         * @param srcFiles 需要压缩的文件列表
         * @param out           压缩文件输出流
         * @throws RuntimeException 压缩失败会抛出运行时异常
         */
        public static void toZip(List<File> srcFiles , OutputStream out)throws RuntimeException {
            long start = System.currentTimeMillis();
            ZipOutputStream zos = null ;
            try {
                zos = new ZipOutputStream(out);
                for (File srcFile : srcFiles) {
                    byte[] buf = new byte[BUFFER_SIZE];
                    zos.putNextEntry(new ZipEntry(srcFile.getName()));
                    int len;
                    FileInputStream in = new FileInputStream(srcFile);
                    while ((len = in.read(buf)) != -1){
                        zos.write(buf, 0, len);
                    }
                    zos.closeEntry();
                    in.close();
                }
                long end = System.currentTimeMillis();
                System.out.println("压缩完成，耗时：" + (end - start) +" ms");
            } catch (Exception e) {
                throw new RuntimeException("zip error from ZipUtils",e);
            }finally{
                if(zos != null){
                    try {
                        zos.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }

        /**
         * 递归压缩方法
         * @param sourceFile 源文件
         * @param zos        zip输出流
         * @param name       压缩后的名称
         * @param KeepDirStructure  是否保留原来的目录结构,true:保留目录结构;
         *                          false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
         * @throws Exception
         */
        private static void compress(File sourceFile, ZipOutputStream zos, String name,
                boolean KeepDirStructure) throws Exception{
            byte[] buf = new byte[BUFFER_SIZE];
            if(sourceFile.isFile()){
                // 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字
                zos.putNextEntry(new ZipEntry(name));
                // copy文件到zip输出流中
                int len;
                FileInputStream in = new FileInputStream(sourceFile);
                while ((len = in.read(buf)) != -1){
                    zos.write(buf, 0, len);
                }
                // Complete the entry
                zos.closeEntry();
                in.close();
            } else {
                File[] listFiles = sourceFile.listFiles();
                if(listFiles == null || listFiles.length == 0){
                    // 需要保留原来的文件结构时,需要对空文件夹进行处理
                    if(KeepDirStructure){
                        // 空文件夹的处理
                        zos.putNextEntry(new ZipEntry(name + "/"));
                        // 没有文件，不需要文件的copy
                        zos.closeEntry();
                    }
                }else {
                    for (File file : listFiles) {
                        // 判断是否需要保留原来的文件结构
                        if (KeepDirStructure) {
                            // 注意：file.getName()前面需要带上父文件夹的名字加一斜杠,
                            // 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了
                            compress(file, zos, name + "/" + file.getName(),KeepDirStructure);
                        } else {
                            compress(file, zos, file.getName(),KeepDirStructure);
                        }
                    }
                }
            }
        }

FileOutputStream fos1 = new FileOutputStream(new File("D:\\study\\博士\\雷达数据\\test\\test.zip"));
            toZip("D:/study/博士/雷达数据/test/test", fos1,true);

C#版本

https://www.cnblogs.com/hahahayang/p/hahahayang.html

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System;
using System.Data;
using System.Configuration;
using System.Collections.Generic;
using System.IO;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.Checksums;

namespace RadarData
{
    /// <summary>
    /// 文件(夹)压缩、解压缩
    /// </summary>
    public class FileCompression
    {
        #region 压缩文件
        /// <summary>
        /// 压缩文件
        /// </summary>
        /// <param name="fileNames">要打包的文件列表</param>
        /// <param name="GzipFileName">目标文件名</param>
        /// <param name="CompressionLevel">压缩品质级别（0~9）</param>
        /// <param name="deleteFile">是否删除原文件</param>
        public static void CompressFile(List<FileInfo> fileNames, string GzipFileName, int CompressionLevel, bool deleteFile)
        {
            ZipOutputStream s = new ZipOutputStream(File.Create(GzipFileName));
            try
            {
                s.SetLevel(CompressionLevel);   //0 - store only to 9 - means best compression
                foreach (FileInfo file in fileNames)
                {
                    FileStream fs = null;
                    try
                    {
                        fs = file.Open(FileMode.Open, FileAccess.ReadWrite);
                    }
                    catch
                    { continue; }
                    //  方法二，将文件分批读入缓冲区
                    byte[] data = new byte[];
                    int size = ;
                    ZipEntry entry = new ZipEntry(Path.GetFileName(file.Name));
                    entry.DateTime = (file.CreationTime > file.LastWriteTime ? file.LastWriteTime : file.CreationTime);
                    s.PutNextEntry(entry);
                    while (true)
                    {
                        size = fs.Read(data, , size);
                        if (size <= ) break;
                        s.Write(data, , size);
                    }
                    fs.Close();
                    if (deleteFile)
                    {
                        file.Delete();
                    }
                }
            }
            finally
            {
                s.Finish();
                s.Close();
            }
        }
        /// <summary>
        /// 压缩文件夹
        /// </summary>
        /// <param name="dirPath">要打包的文件夹</param>
        /// <param name="GzipFileName">目标文件名</param>
        /// <param name="CompressionLevel">压缩品质级别（0~9）</param>
        /// <param name="deleteDir">是否删除原文件夹</param>
        public static void CompressDirectory(string dirPath, string GzipFileName, int CompressionLevel, bool deleteDir)
        {
            //压缩文件为空时默认与压缩文件夹同一级目录
            if (GzipFileName == string.Empty)
            {
                GzipFileName = dirPath.Substring(dirPath.LastIndexOf("//") + );
                GzipFileName = dirPath.Substring(, dirPath.LastIndexOf("//")) + "//" + GzipFileName + ".zip";
            }
            //if (Path.GetExtension(GzipFileName) != ".zip")
            //{
            //    GzipFileName = GzipFileName + ".zip";
            //}
            using (ZipOutputStream zipoutputstream = new ZipOutputStream(File.Create(GzipFileName)))
            {
                zipoutputstream.SetLevel(CompressionLevel);
                Crc32 crc = new Crc32();
                Dictionary<string, DateTime> fileList = GetAllFies(dirPath);
                foreach (KeyValuePair<string, DateTime> item in fileList)
                {
                    FileStream fs = File.OpenRead(item.Key.ToString());
                    byte[] buffer = new byte[fs.Length];
                    fs.Read(buffer, , buffer.Length);
                    ZipEntry entry = new ZipEntry(item.Key.Substring(dirPath.Length));
                    entry.DateTime = item.Value;
                    entry.Size = fs.Length;
                    fs.Close();
                    crc.Reset();
                    crc.Update(buffer);
                    entry.Crc = crc.Value;
                    zipoutputstream.PutNextEntry(entry);
                    zipoutputstream.Write(buffer, , buffer.Length);
                }
            }
            if (deleteDir)
            {
                Directory.Delete(dirPath, true);
            }
        }
        /// <summary>
        /// 获取所有文件
        /// </summary>
        /// <returns></returns>
        private static Dictionary<string, DateTime> GetAllFies(string dir)
        {
            Dictionary<string, DateTime> FilesList = new Dictionary<string, DateTime>();
            DirectoryInfo fileDire = new DirectoryInfo(dir);
            if (!fileDire.Exists)
            {
                throw new System.IO.FileNotFoundException("目录:" + fileDire.FullName + "没有找到!");
            }
            GetAllDirFiles(fileDire, FilesList);
            GetAllDirsFiles(fileDire.GetDirectories(), FilesList);
            return FilesList;
        }
        /// <summary>
        /// 获取一个文件夹下的所有文件夹里的文件
        /// </summary>
        /// <param name="dirs"></param>
        /// <param name="filesList"></param>
        private static void GetAllDirsFiles(DirectoryInfo[] dirs, Dictionary<string, DateTime> filesList)
        {
            foreach (DirectoryInfo dir in dirs)
            {
                foreach (FileInfo file in dir.GetFiles("*.*"))
                {
                    filesList.Add(file.FullName, file.LastWriteTime);
                }
                GetAllDirsFiles(dir.GetDirectories(), filesList);
            }
        }
        /// <summary>
        /// 获取一个文件夹下的文件
        /// </summary>
        /// <param name="dir">目录名称</param>
        /// <param name="filesList">文件列表HastTable</param>
        private static void GetAllDirFiles(DirectoryInfo dir, Dictionary<string, DateTime> filesList)
        {
            foreach (FileInfo file in dir.GetFiles("*.*"))
            {
                filesList.Add(file.FullName, file.LastWriteTime);
            }
        }
        #endregion
        #region 解压缩文件
        /// <summary>
        /// 解压缩文件
        /// </summary>
        /// <param name="GzipFile">压缩包文件名</param>
        /// <param name="targetPath">解压缩目标路径</param>
        public static void Decompress(string GzipFile, string targetPath)
        {
            //string directoryName = Path.GetDirectoryName(targetPath + "//") + "//";
            string directoryName = targetPath;
            if (!Directory.Exists(directoryName)) Directory.CreateDirectory(directoryName);//生成解压目录
            string CurrentDirectory = directoryName;
            byte[] data = new byte[];
            int size = ;
            ZipEntry theEntry = null;
            using (ZipInputStream s = new ZipInputStream(File.OpenRead(GzipFile)))
            {
                while ((theEntry = s.GetNextEntry()) != null)
                {
                    if (theEntry.IsDirectory)
                    {// 该结点是目录
                        if (!Directory.Exists(CurrentDirectory + theEntry.Name)) Directory.CreateDirectory(CurrentDirectory + theEntry.Name);
                    }
                    else
                    {
                        if (theEntry.Name != String.Empty)
                        {
                            //  检查多级目录是否存在
                            if (theEntry.Name.Contains("//"))
                            {
                                string parentDirPath = theEntry.Name.Remove(theEntry.Name.LastIndexOf("//") + );
                                if (!Directory.Exists(parentDirPath))
                                {
                                    Directory.CreateDirectory(CurrentDirectory + parentDirPath);
                                }
                            }

                            //解压文件到指定的目录
                            using (FileStream streamWriter = File.Create(CurrentDirectory + theEntry.Name))
                            {
                                while (true)
                                {
                                    size = s.Read(data, , data.Length);
                                    if (size <= ) break;
                                    streamWriter.Write(data, , size);
                                }
                                streamWriter.Close();
                            }
                        }
                    }
                }
                s.Close();
            }
        }
        #endregion
    }
}

lib包下载地址：http://pan.baidu.com/s/1pLausnL