如何在 Java 中将字节数组转换为 Base64? [英] How do I convert a byte array to Base64 in Java?

问题描述

好的，我知道如何在 C# 中做到这一点.

Okay, I know how to do it in C#.

就这么简单:

Convert.ToBase64String(byte[])
and Convert.FromBase64String(string) to get byte[] back.

如何在 Java 中执行此操作?

How can I do this in Java?

推荐答案

Java 8+

编码或解码字节数组:

Java 8+

Encode or decode byte arrays:

byte[] encoded = Base64.getEncoder().encode("Hello".getBytes());
println(new String(encoded));   // Outputs "SGVsbG8="

byte[] decoded = Base64.getDecoder().decode(encoded);
println(new String(decoded))    // Outputs "Hello"

或者如果你只想要字符串:

Or if you just want the strings:

String encoded = Base64.getEncoder().encodeToString("Hello".getBytes());
println(encoded);   // Outputs "SGVsbG8="

String decoded = new String(Base64.getDecoder().decode(encoded.getBytes()));
println(decoded)    // Outputs "Hello"

有关详细信息，请参阅Base64.

For more info, see Base64.

Base64 不与低于 8 的 Java 版本捆绑在一起.我建议使用 Apache Commons编解码器.

Base64 is not bundled with Java versions less than 8. I recommend using Apache Commons Codec.

对于直接字节数组:

Base64 codec = new Base64();
byte[] encoded = codec.encode("Hello".getBytes());
println(new String(encoded));   // Outputs "SGVsbG8="

byte[] decoded = codec.decode(encoded);
println(new String(decoded))    // Outputs "Hello"

或者如果你只想要字符串:

Or if you just want the strings:

Base64 codec = new Base64();
String encoded = codec.encodeBase64String("Hello".getBytes());
println(encoded);   // Outputs "SGVsbG8="

String decoded = new String(codec.decodeBase64(encoded));
println(decoded)    // Outputs "Hello"

春天

如果您已经在 Spring 项目中工作，您可能会发现他们的 org.springframework.util.Base64Utils 类更符合人体工程学:

Spring

If you're working in a Spring project already, you may find their org.springframework.util.Base64Utils class more ergonomic:

对于直接字节数组:

byte[] encoded = Base64Utils.encode("Hello".getBytes());
println(new String(encoded))    // Outputs "SGVsbG8="

byte[] decoded = Base64Utils.decode(encoded);
println(new String(decoded))    // Outputs "Hello"

或者如果你只想要字符串:

Or if you just want the strings:

String encoded = Base64Utils.encodeToString("Hello".getBytes());
println(encoded);   // Outputs "SGVsbG8="

String decoded = Base64Utils.decodeFromString(encoded);
println(new String(decoded))    // Outputs "Hello"

Android(使用 Java <8)

如果您使用的是 Java 8 之前的 Android SDK，那么您最好的选择是使用捆绑的 android.util.Base64.

对于直接字节数组:

byte[] encoded = Base64.encode("Hello".getBytes());
println(new String(encoded))    // Outputs "SGVsbG8="

byte [] decoded = Base64.decode(encoded);
println(new String(decoded))    // Outputs "Hello"

或者如果你只想要字符串:

Or if you just want the strings:

String encoded = Base64.encodeToString("Hello".getBytes());
println(encoded);   // Outputs "SGVsbG8="

String decoded = new String(Base64.decode(encoded));
println(decoded)    // Outputs "Hello"

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