在Java中放气在Javascript中充气

Question

我正在通过nodejs将压缩数据从java应用程序发送到网页。使用java deflater压缩数据，并对base64进行编码。在网页上，我试图用https://github.com/dankogai/js-deflate膨胀数据，但它不起作用（空结果）。我错过什么了吗

Java方面：

private String compress(String s) {
    DeflaterOutputStream def = null;
    String compressed = null;
    try {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        // create deflater without header
        def = new DeflaterOutputStream(out, new Deflater(Deflater.DEFAULT_COMPRESSION, true));
        def.write(s.getBytes());
        def.close();
        compressed = Base64.encodeBase64String(out.toByteArray());
        System.out.println(compressed);
    } catch(Exception e) {
        Log.c(TAG, "could not compress data: " + e);
    }
    return compressed;
}

Javascript方面：

var data = RawDeflate.inflate(Base64.fromBase64(compressed));

Answer 1

试试这个：

public static String compressAndEncodeString(String str) {
    DeflaterOutputStream def = null;
    String compressed = null;
    try {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        // create deflater without header
        def = new DeflaterOutputStream(out, new Deflater(Deflater.BEST_COMPRESSION, true));
        def.write(str.getBytes());
        def.close();
        compressed = Base64.encodeToString(out.toByteArray(), Base64.DEFAULT);
    } catch(Exception e) {
        Log.e(TAG, "could not compress data: " + e);
    }
    return compressed;
}

Answer 2

我遇到了同样的问题。js泄气项目充气机似乎已损坏。我发现它可以在短输入时工作，但在长输入时失败（例如，lorem ipsum作为测试数据）

一个更好的选择是zlib.js

下面是我如何使用它在Javascript中膨胀一个JSON对象，该对象在服务器上生成、压缩和base64编码：

var base64toBinary = function (base64) {
    var binary_string = window.atob(base64);
    var len = binary_string.length;
    var bytes = new Uint8Array( len );
    for (var i = 0; i < len; i++)        {
        var ascii = binary_string.charCodeAt(i);
        bytes[i] = ascii;
    }
    return bytes.buffer;
}

var utf8ToString = function (uintArray) {
    var encodedString = String.fromCharCode.apply(null, uintArray),
       decodedString = decodeURIComponent(escape(encodedString));
    return decodedString;
}

var object = JSON.parse(utf8ToString(
  new Zlib.RawInflate(base64toBinary(base64StringFromServer)).decompress()));

（仅供参考，助手函数源自其他stackoverflow答案）