壓縮/解壓縮 含密碼的ZIP檔

Java提供的 zip util 沒有支援加密的zip格式, 若有需要可使用 Zip4j 提供的函式來進行, 功能完整, 也有範例
►壓縮檔案

try {
    //檔案若已存在則會加入,若存在檔非zip格式則會拋出異常
    ZipFile zipFile = new ZipFile("c:\\my.zip");
 
    ArrayList filesToAdd = new ArrayList();
    filesToAdd.add(new File("c:\\sample.txt"));
    filesToAdd.add(new File("c:\\myvideo.avi"));
 
    ZipParameters parameters = new ZipParameters();
    parameters.setCompressionMethod(Zip4jConstants.COMP_DEFLATE); // set compression method to deflate compression
    // DEFLATE_LEVEL_FASTEST - Lowest compression level but higher speed of compression
    // DEFLATE_LEVEL_FAST - Low compression level but higher speed of compression
    // DEFLATE_LEVEL_NORMAL - Optimal balance between compression level/speed
    // DEFLATE_LEVEL_MAXIMUM - High compression level with a compromise of speed
    // DEFLATE_LEVEL_ULTRA - Highest compression level but low speed
    parameters.setCompressionLevel(Zip4jConstants.DEFLATE_LEVEL_NORMAL);
    zipFile.addFiles(filesToAdd, parameters);
} catch (ZipException e) { e.printStackTrace(); }

►壓縮含蜜瑪檔案

try {
    ZipFile zipFile = new ZipFile("c:\\my.zip");
    ArrayList filesToAdd = new ArrayList();
    filesToAdd.add(new File("c:\\ZipTest\\sample.txt"));
    ZipParameters parameters = new ZipParameters();
    parameters.setCompressionMethod(Zip4jConstants.COMP_DEFLATE);
    parameters.setCompressionLevel(Zip4jConstants.DEFLATE_LEVEL_NORMAL);
 
    parameters.setEncryptFiles(true);
    parameters.setEncryptionMethod(Zip4jConstants.ENC_METHOD_STANDARD);//Zip4jConstants.ENC_METHOD_AES
    parameters.setPassword("test123!");
 
    zipFile.addFiles(filesToAdd, parameters);
} catch (ZipException e) { e.printStackTrace(); }

►壓縮檔案分割

try {
    ZipFile zipFile = new ZipFile("c:\\my.zip");
    ArrayList filesToAdd = new ArrayList();
    filesToAdd.add(new File("c:\\sample.txt"));
    ZipParameters parameters = new ZipParameters();
    parameters.setCompressionMethod(Zip4jConstants.COMP_DEFLATE);
    parameters.setCompressionLevel(Zip4jConstants.DEFLATE_LEVEL_NORMAL);
    // 壓縮檔若已存在則拋出異常
    zipFile.createZipFile(filesToAdd, parameters, true, 10485760);
} catch (ZipException e) { e.printStackTrace(); }

►解壓縮所有檔案

try {
    ZipFile zipFile = new ZipFile("c:\\my.zip");
    if (zipFile.isEncrypted()) {
        zipFile.setPassword("password");
    }
    zipFile.extractAll("c:\\ZipTest");   
} catch (ZipException e) { e.printStackTrace(); }

►解壓縮指定檔案

try {
    ZipFile zipFile = new ZipFile("c:\\my.zip");
    if (zipFile.isEncrypted()) {
        zipFile.setPassword("test123!");
    }
    //指定檔案名稱
    zipFile.extractFile("Ronan_Keating_-_In_This_Life.mp3", "c:\\ZipTest\\");
    zipFile.extractFile("FolderToAdd\\myvideo.avi", "c:\\ZipTest\\");   
    //巡迴方式
    List fileHeaderList = zipFile.getFileHeaders();
    for (int i = 0; i < fileHeaderList.size(); i++) {
        FileHeader fileHeader = (FileHeader)fileHeaderList.get(i);
        zipFile.extractFile(fileHeader, "c:\\ZipTest\\");
    }
    //解壓縮並變更檔名
    UnzipParameters unzipParameters = new UnzipParameters();
    unzipParameters.setIgnoreDateTimeAttributes(true);
    unzipParameters.setIgnoreAllFileAttributes(true);
    zip.extractFile("test.txt", "\sdcard", unzipParameters, "新檔名");
} catch (ZipException e) { e.printStackTrace(); }

►壓縮檔案內移除資料

try {
    ZipFile zipFile = new ZipFile("c:\\my.zip");
    // 指定檔
    zipFile.removeFile("myvideo.avi");   
    // 從 FileHeader 方式移除
    if (zipFile.getFileHeaders() != null && zipFile.getFileHeaders().size() > 0) {
        zipFile.removeFile((FileHeader)zipFile.getFileHeaders().get(0));
    } else {
        System.out.println("This cannot be demonstrated as zip file does not have any files left");
    }
} catch (ZipException e) { e.printStackTrace(); }

►壓縮檔內資訊

try {
    ZipFile zipFile = new ZipFile("c:\\my.zip");
    List fileHeaderList = zipFile.getFileHeaders();   
 
    for (int i = 0; i < fileHeaderList.size(); i++) {
        FileHeader fileHeader = (FileHeader)fileHeaderList.get(i);
        // FileHeader contains all the properties of the file
        System.out.println("****File Details for: " + fileHeader.getFileName() + "*****");
        System.out.println("Name: " + fileHeader.getFileName());
        System.out.println("Compressed Size: " + fileHeader.getCompressedSize());
        System.out.println("Uncompressed Size: " + fileHeader.getUncompressedSize());
        System.out.println("CRC: " + fileHeader.getCrc32());
        System.out.println("************************************************************");
    }
} catch (ZipException e) { e.printStackTrace(); }

http://www.lingala.net/zip4j/