解码和编码问题.android.util.*和java.util.*中Base64类的不同实现? [英] Decoding and Encoding issue. Different implementations of Base64 Class in android.util.* and java.util.*?

问题描述

我正在编写一个应用程序，该应用程序使用给定的String str进行以下操作:

I am writing an App which does the following with a given String str:

encode(encrypt(encode(stringToBytearray(str))));

服务器接收Base64编码的字符串，然后将其解码->解密->解码，以从应用程序获取发送的String str.

The Server receives the Base64 encoded String, which is then decoded -> decrypted -> decoded, to get the sent String str from the App.

不幸的是，它不适用于所有字符串，长字符串导致长Base64字符串，并且我的服务器抛出以下异常:

Unfortunately it doesnt work for all Strings, long Strings lead to a long Base64 String and my Server throws the following Exception:

Exception in thread "main" java.lang.IllegalArgumentException: Illegal base64 character 5b
 at java.util.Base64$Decoder.decode0(Base64.java:714)
 at java.util.Base64$Decoder.decode(Base64.java:526)
 at Main.decode(Main.java:113)
 at Main.main(ain.java:33)

字符串的格式为[[string，string，...，string]"，不带"s".

The String has the format "[string, string, ..., string]" without "s.

就像我上面提到的那样，对于不太长的字符串(抱歉，我还无法确定长度)，这是可行的.所以我认为我实施得正确.

Like I mentioned above, for Strings which are not too long (sorry I cant quantify the length yet), this works. So I think I implemented it right.

奇怪的是，如果我不发送它，但可以解码(decrypt(decode(decode(stringToBytearray(str)))));设备本身上的字符串，就可以完美运行.

Whats weird is, that if I dont send it, but decode(decrypt(decode(stringToBytearray(str)))); the String on the Device itself, it all works perfectly.

我的设置:JDK 7，eclipse(adt-bundle，android开发)(Windows 7)

My Setup: JDK 7, eclipse (adt-bundle, android development) (Windows 7)

JDK 8，eclipse('normal'java)(Linux(xubuntu))

JDK 8, eclipse ('normal' java) (Linux (xubuntu))

是因为两个类(Base64)的实现方式有所不同吗?如果是这样，我如何使它工作?

Is it because both Classes (Base64) are implemented diffrently? If so, how can I make it work?

以下是编码/解码方法:

Here are the Encoding/Decoding Methods:

编码(设备:在Windows 7，adt-bundle，Android-Dev，jdk 7上):

Encoding (Device: on Windows 7, adt-bundle, Android-Dev, jdk 7):

import android.util.Base64

public byte[] encode(byte[] bytearrayToEncode){
   return Base64.encode(bytearrayToEncode, Base64.NO_WRAP|Base64.URL_SAFE);
}

解码(服务器:在Linux上，jdk 8):

Decoding (Server: on Linux, jdk 8):

import java.util.Base64

public byte[] decode(byte[] bytearrayToEncode){
   return Base64.getUrlDecoder().decode(bytearrayToDecode);
}

所有字符串都使用相同的字符集(utf-8)进行解码/编码！编码/解码:Base64

Strings are all De-/Encoded with the same charset (utf-8)! Encoding/Decoding: Base64

加密:AES

如果您需要更多信息，请问一下，但是我想我提供了所有必要的信息.

If you need more Information, just ask, but I think I provided all neccessary informations.

public String bytearrayToString(byte[] bytearray){
    String str = null;
    try {
        str = new String(bytearray, "UTF-8");
    } catch (UnsupportedEncodingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return str;
}

public byte[] stringToBytearray(String str){
    byte[] bytearray = null;
    try {
        bytearray = str.getBytes("UTF-8");
    } catch (UnsupportedEncodingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return bytearray;
}

推荐答案

您必须使用JSONObjects将Base64字符串发送到服务器.如果是这样，则JSONObject将在字符串中添加"\"转义字符，这些字符是非法的Base64字符.您所需要做的就是

You must be using JSONObjects to send the Base64 String to the server. If so then the JSONObject will add " \ " escape characters to the string which are illegal Base64 characters. All you need to do is

String rectifiedString = Base64String.replace("\\","");

在服务器端使用获取的字符串之前.

on the server end before using the acquired string.

可选

也在服务器端使用

import javax.xml.bind.DatatypeConverter;

和

字符串结果= DatatypeConverter.printBase64Binary(bytearrayToDecode);

byte[] result = DatatypeConverter.parseBase64Binary(str);

相反.

它不仅可以完成工作，而且在编码/解码方面也要快得多(

It will not only get the job done but is much faster at encoding/decoding (as benchmarked here).

这篇关于解码和编码问题.android.util.*和java.util.*中Base64类的不同实现?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！