在 Java 中编码为 Base64 [英] Encoding as Base64 in Java

问题描述

我需要在 Java 中用 Base64 编码对一些数据进行编码.我怎么做?提供 Base64 编码器的类的名称是什么?

I need to encode some data in the Base64 encoding in Java. How do I do that? What is the name of the class that provides a Base64 encoder?

我尝试使用 sun.misc.BASE64Encoder 类，但没有成功.我有以下 Java 7 代码行:

I tried to use the sun.misc.BASE64Encoder class, without success. I have the following line of Java 7 code:

wr.write(new sun.misc.BASE64Encoder().encode(buf));

我正在使用 Eclipse.Eclipse 将此行标记为错误.我导入了所需的库:

I'm using Eclipse. Eclipse marks this line as an error. I imported the required libraries:

import sun.misc.BASE64Encoder;
import sun.misc.BASE64Decoder;

但同样，它们都显示为错误.我在这里找到了一篇类似的帖子.

But again, both of them are shown as errors. I found a similar post here.

我使用 Apache Commons 作为建议的解决方案，包括:

I used Apache Commons as the solution suggested by including:

import org.apache.commons.*;

并导入从以下位置下载的 JAR 文件:http://commons.apache.org/codec/

and importing the JAR files downloaded from: http://commons.apache.org/codec/

但是问题依然存在.Eclipse 仍然显示前面提到的错误.我该怎么办?

But the problem still exists. Eclipse still shows the errors previously mentioned. What should I do?

推荐答案

您需要更改您的类的导入:

You need to change the import of your class:

import org.apache.commons.codec.binary.Base64;

然后将您的类更改为使用 Base64 类.

And then change your class to use the Base64 class.

这是一些示例代码:

byte[] encodedBytes = Base64.encodeBase64("Test".getBytes());
System.out.println("encodedBytes " + new String(encodedBytes));
byte[] decodedBytes = Base64.decodeBase64(encodedBytes);
System.out.println("decodedBytes " + new String(decodedBytes));

然后阅读为什么不应该使用 sun.* 包.

您现在可以将 java.util.Base64 与 Java 8 一起使用.首先，像往常一样导入它:

You can now use java.util.Base64 with Java 8. First, import it as you normally do:

import java.util.Base64;

然后使用Base64静态方法如下:

Then use the Base64 static methods as follows:

byte[] encodedBytes = Base64.getEncoder().encode("Test".getBytes());
System.out.println("encodedBytes " + new String(encodedBytes));
byte[] decodedBytes = Base64.getDecoder().decode(encodedBytes);
System.out.println("decodedBytes " + new String(decodedBytes));

如果你想直接对字符串进行编码并得到编码字符串的结果，你可以使用这个:

If you directly want to encode string and get the result as encoded string, you can use this:

String encodeBytes = Base64.getEncoder().encodeToString((userName + ":" + password).getBytes());

请参阅 Base64 的 Java 文档更多.

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