我正在通过nodejs将java应用程序中的压缩数据发送到网页。使用java deflater和base64编码压缩数据。在网页上我试图用https://github.com/dankogai/js-deflate来扩充数据,但它不起作用(空结果)。我错过了什么吗?
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));
答案 0 :(得分: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;
}
答案 1 :(得分:0)
我遇到了同样的问题。 js-deflate项目inflater看起来破碎了。我发现它可以在短输入上工作,但在长输入时失败(例如,lorem ipsum作为测试数据)。
更好的选择是zlib.js。
以下是我如何使用它在Javascript中为服务器上生成,压缩和base64编码的JSON对象充气:
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,辅助函数源自其他stackoverflow答案)。