加密和解密ArrayList <String>

Question

我需要通过加密来存储文件中的数组字符串列表.然后我解密文件内容并将它们恢复到数组列表.但是当我解密内容时,内容中会出现'Null'块.没有'Null'块,其余文本与i编码相同.

public static void encryptFile(List<String> moduleList, File fileOut) {
    try {
        OutputStream out = new FileOutputStream(fileOut);
        out = new CipherOutputStream(out, encryptCipher);
        StringBuilder moduleSet = new StringBuilder();
        for (String module : moduleList) {
            moduleSet.append(module + "#");
        }
        out.write(moduleSet.toString().getBytes(Charset.forName("UTF-8")));
        out.flush();
        out.close();
    } catch (java.io.IOException ex) {
        System.out.println("Exception: " + ex.getMessage());
    }
}

public static List<String> decryptFile(File fileIn) {
    List<String> moduleList = new ArrayList<String>();
    byte[] buf = new byte[16];

    try {
        InputStream in = new FileInputStream(fileIn);
        in = new CipherInputStream(in, decryptCipher);

        int numRead = 0;
        int counter = 0;
        StringBuilder moduleSet = new StringBuilder();
        while ((numRead = in.read(buf)) >= 0) {
            counter++;
            moduleSet.append(new String(buf));
        }

        String[] blocks = moduleSet.split("#");
        System.out.println("Items: " + blocks.length);

    } catch (java.io.IOException ex) {
        System.out.println("Exception: " + ex.getMessage());
    }
    return moduleList;
}

我尝试使用UTF-16,因为字符串是用UTF-16编写的,但它只会使输出最差.您的建议将不胜感激...谢谢

Answer 1

我将删除将列表内容与字符串相互转换的代码，并将其替换为ObjectOutputStream：

FileOutputStream out1 = new FileOutputStream(fileOut);
CipherOutputStream out2 = new CipherOutputStream(out1, encryptCipher);
ObjectOutputStream out3 = new ObjectOutputStream(out2);
out3.writeObject(moduleList);

然后，回读：

FileInputStream in1 = new FileInputStream(fileIn);
CipherInputStream in2 = new CipherInputStream(in1, decryptCipher);
ObjectInputStream in3 = new ObjectInputStream(in2);
moduleList = (Set<String>)in3.readObject()