如何使用org.apache.commons.codec.binary.base64对Java对象进行Base64编码？ [英] How to Base64 encode a Java object using org.apache.commons.codec.binary.base64?

问题描述

我一直在尝试对象序列化和Base64编码结果。它适用于Sun的lib：

I've been trying to do an object serialization and Base64 encode the result. It works with Sun's lib:

Bean01 bean01 = new Bean01();
bean01.setDefaultValues();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
new ObjectOutputStream( baos ).writeObject( bean01 );
System.out.println(Base64.encode(baos.toByteArray()));

这很好用。但是，我想使用org.apache.commons.codec.binary.base64做同样的事情，但这不会返回相同的字符串：

This works fine. However, I would like to do the same using org.apache.commons.codec.binary.base64, but this does not return the same string:

System.out.println（org.apache.commons.codec.binary.Base64.encodeBase64（baos.toByteArray（）））;

使用Apache编码器实现byteArray的正确Base64编码的正确方法是什么？

What would be the correct way to achieve the correct Base64 encoding of a byteArray using Apache's encoder?

推荐答案

实际上<$> c $ c> commons-codec 您正在使用的版本和特定的Sun内部版本执行会给出相同的结果。我认为你认为他们提供了不同的版本，因为当你这样做时，你隐含地在一个数组上调用 toString（）：

Actually the commons-codec version and specific Sun internal version you are using do give the same results. I think you thought they were giving different versions because you are implicitly calling toString() on an array when you do:

System.out.println(org.apache.commons.codec.binary.Base64.encodeBase64(baos.toByteArray()));

绝对不会打印出数组内容。相反，它只会打印出数组引用的地址。

which is definitely does not print out the array contents. Instead, that will only print out the address of the array reference.

我编写了以下程序来相互测试编码器。您将从下面的输出中看到给出相同的结果：

I've written the following program to test the encoders against each other. You'll see from the output below that the give the same results:

import java.util.Random;

public class Base64Stuff
{
    public static void main(String[] args) {
        Random random = new Random();
        byte[] randomBytes = new byte[32];
        random.nextBytes(randomBytes);

        String internalVersion = com.sun.org.apache.xerces.internal.impl.dv.util.Base64.encode(randomBytes);
        byte[] apacheBytes =  org.apache.commons.codec.binary.Base64.encodeBase64(randomBytes);
        String fromApacheBytes = new String(apacheBytes);

        System.out.println("Internal length = " + internalVersion.length());
        System.out.println("Apache bytes len= " + fromApacheBytes.length());
        System.out.println("Internal version = |" + internalVersion + "|");
        System.out.println("Apache bytes     = |" + fromApacheBytes + "|");
        System.out.println("internal equal apache bytes?: " + internalVersion.equals(fromApacheBytes));
    }
}

这是一次运行的输出：

Internal length = 44
Apache bytes len= 44
Internal version = |Kf0JBpbxCfXutxjveYs8CXMsFpQYgkllcHHzJJsz9+g=|
Apache bytes     = |Kf0JBpbxCfXutxjveYs8CXMsFpQYgkllcHHzJJsz9+g=|
internal equal apache bytes?: true

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