"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
Okay, I know how to do it in C#.
好的，我知道如何在 C# 中做到这一点。
It's as simple as:它很简单：
Convert.ToBase64String(byte[])
and Convert.FromBase64String(string) to get byte[] back.
4 个解决方案
解决方案1
308 2015-11-05 18:40:56
Java 8+ Java 8+<\/h1>
Encode or decode byte arrays:编码或解码字节数组：
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"<\/code><\/pre>Or if you just want the strings:或者，如果您只想要字符串：
String encoded = Base64.getEncoder().encodeToString("Hello".getBytes()); println(encoded); \/\/ Outputs "SGVsbG8=" String decoded = new String(Base64.getDecoder().decode(encoded.getBytes())); println(decoded) \/\/ Outputs "Hello"<\/code><\/pre>For more info, seeBase64<\/a> .有关详细信息，请参阅
Base64 is not bundled with Java versions less than 8. I recommend using Apache Commons Codec<\/a> . Base64 不与低于 8 的 Java 版本捆绑在一起。我建议使用
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"<\/code><\/pre>Or if you just want the strings:或者，如果您只想要字符串：
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"<\/code><\/pre>
If you're working in a Spring project already, you may find their
org.springframework.util.Base64Utils<\/code><\/a> class more ergonomic:org.springframework.util.Base64Utils<\/code><\/a>类更符合人体工程学：
For direct byte arrays: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"<\/code><\/pre>Or if you just want the strings:或者，如果您只想要字符串：
String encoded = Base64Utils.encodeToString("Hello".getBytes()); println(encoded); \/\/ Outputs "SGVsbG8=" String decoded = Base64Utils.decodeFromString(encoded); println(new String(decoded)) \/\/ Outputs "Hello"<\/code><\/pre>
If you are using the Android SDK before Java 8 then your best option is to use the bundled
android.util.Base64<\/code> .android.util.Base64<\/code> 。
For direct byte arrays: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"<\/code><\/pre>Or if you just want the strings:或者，如果您只想要字符串：
String encoded = Base64.encodeToString("Hello".getBytes()); println(encoded); \/\/ Outputs "SGVsbG8=" String decoded = new String(Base64.decode(encoded)); println(decoded) \/\/ Outputs "Hello"<\/code><\/pre>"
解决方案2
32 2012-05-03 03:50:37
Use:利用：
byte[] data = Base64.encode(base64str);
解决方案3
18 2018-06-06 07:29:47
Additionally, for our Android friends (API Level 8):此外，对于我们的 Android 朋友（API 级别 8）：
import android.util.Base64
...
Base64.encodeToString(bytes, Base64.DEFAULT);
解决方案4
8 2018-06-15 09:05:49
In case you happen to be using Spring framework along with java, there is an easy way around.如果您碰巧将 Spring 框架与 java 一起使用，则有一种简单的方法。
- Import the following.导入以下内容。 import org.springframework.util.Base64Utils;导入 org.springframework.util.Base64Utils；<\/pre><\/li>
Convert like this.像这样转换。
\nbyte[] bytearr ={0,1,2,3,4};字节 [] 字节泪 = {0,1,2,3,4};\nString encodedText = Base64Utils.encodeToString(bytearr);字符串编码文本 = Base64Utils.encodeToString(bytearr);\n<\/pre>To decode you can use the decodeToString method of the Base64Utils class.
<\/li><\/ol>"要解码，您可以使用 Base64Utils 类的 decodeToString 方法。
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