Java 输入字节数组在 40 处的结束字节不正确
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Input byte array has incorrect ending byte at 40
提问by toom
I have a string that is base64 encoded. It looks like this:
我有一个 base64 编码的字符串。它看起来像这样：
eyJibGExIjoiYmxhMSIsImJsYTIiOiJibGEyIn0=
Any online tool can decode this to the proper string which is {"bla1":"bla1","bla2":"bla2"}. However, my Java implementation fails:
任何在线工具都可以将其解码为正确的字符串，即{"bla1":"bla1","bla2":"bla2"}. 但是，我的 Java 实现失败了：
import java.util.Base64;
System.out.println("payload = " + payload);
String json = new String(Base64.getDecoder().decode(payload));
I'm getting the following error:
我收到以下错误：
payload = eyJibGExIjoiYmxhMSIsImJsYTIiOiJibGEyIn0=
java.lang.IllegalArgumentException: Input byte array has incorrect ending byte at 40
What is wrong with my code?
我的代码有什么问题？
采纳答案by toom
Okay, I found out. The original String is encoded on an Android device using android.util.Base64by Base64.encodeToString(json.getBytes("UTF-8"), Base64.DEFAULT);. It uses android.util.Base64.DEFAULTencoding scheme.
好吧，我发现了。原始字符串在 Android 设备上使用android.util.Base64by 进行编码Base64.encodeToString(json.getBytes("UTF-8"), Base64.DEFAULT);。它使用android.util.Base64.DEFAULT编码方案。
Then on the server side when using java.util.Base64this has to be decoded with Base64.getMimeDecoder().decode(payload)notwith Base64.getDecoder().decode(payload)
然后在服务器端使用时java.util.Base64，必须使用Base64.getMimeDecoder().decode(payload)notwith进行解码Base64.getDecoder().decode(payload)
回答by JustGage
I was trying to use the strings from the args. I found that if I use arg[0].trim()that it made it work. eg
我试图使用 args 中的字符串。我发现如果我使用arg[0].trim()它就可以了。例如
Base64.getDecoder().decode(arg[0].trim());
I guess there's some sort of whitespace that gets it messed up.
我想有某种空白让它变得一团糟。
回答by Artem Komarov
Maybe too late, but I also had this problem.
也许为时已晚，但我也遇到了这个问题。
By default, the Android Base64 util adds a newline character to the end of the encoded string.
The Base64.NO_WRAP flag tells the util to create the encoded string without the newline character.
默认情况下，Android Base64 实用程序会在编码字符串的末尾添加一个换行符。
Base64.NO_WRAP 标志告诉实用程序创建没有换行符的编码字符串。
Your android app should encode srcsomething like this:
您的 android 应用程序应该编码src如下：
String encode = Base64.encodeToString(src.getBytes(), Base64.NO_WRAP);
