使用 Scala 或 Java 进行 Base 64 编码
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Base 64 encoding with Scala or Java
提问by Erick Stone
I have tried :
我试过了 ：
val md = java.security.MessageDigest.getInstance("SHA-1")
val result = new sun.misc.BASE64Encoder().encode(md.digest("user:pass".getBytes))
RESULT:
结果：
md: java.security.MessageDigest = SHA-1 Message Digest from SUN, <initialized>
result: String = smGaoVKd/cQkjm7b88GyorAUz20=
I also tried :
我也试过：
import java.net.URLEncoder
val result = URLEncoder.encode(user + ":" + pass, "UTF-8")
RESULT:
结果：
result: String = user%3Apass
Based on http://www.base64encode.org/The value I am wanting for result should be "dXNlcjpwYXNz"
基于http://www.base64encode.org/我想要的结果值应该是“dXNlcjpwYXNz”
What is the site doing differently from these encodings? Also, how might I mimic the site in Java/Scala?
该网站与这些编码有何不同？另外，我如何在 Java/Scala 中模仿该站点？
Note, the specific application is for a header using Basic Authentication.
请注意，特定应用程序用于使用基本身份验证的标头。
采纳答案by Louis Wasserman
To get "user:pass" to "dXNlcjpwYXNz", you should be base64-encoding the UTF-8 encoded string, but not hashing.
要将“user:pass”转换为“dXNlcjpwYXNz”，您应该对 UTF-8 编码的字符串进行 base64 编码，而不是散列。
Using the third-party Guava library, I can run
使用第三方番石榴库，我可以运行
System.out.println(BaseEncoding.base64()
.encode("user:pass".getBytes(Charsets.UTF_8)));
and I get out
我出去
dXNlcjpwYXNz
as requested. The other Base64 encoders should work similarly.
按照要求。其他 Base64 编码器应该类似地工作。
回答by Vladimir Matveev
Since Java 8 there are handy utility classes directly in the standard library: Base64.Decoderand Base64.Encoder. There are also some static factory methods to construct instances of these classes which perform Base64 encoding/decoding for various flavors of Base64 in Base64class.
从 Java 8 开始，标准库中直接提供了方便的实用程序类：Base64.Decoder和Base64.Encoder. 还有一些静态工厂方法来构造这些类的实例，这些实例为类中的各种 Base64 执行 Base64 编码/解码Base64。
This is how to use the encoder:
这是使用编码器的方法：
import java.util.Base64
import java.nio.charset.StandardCharsets
Base64.getEncoder.encodeToString("user:pass".getBytes(StandardCharsets.UTF_8))
回答by Epicurist
Scala was asked:
有人问斯卡拉：
import java.nio.charset.StandardCharsets
val (password, expected) = ("user:pass".getBytes(StandardCharsets.UTF_8), "dXNlcjpwYXNz")
assume(java.util.Base64.getEncoder.encodeToString(password)==expected)
