java Base64 InputStream 转字符串
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Base64 InputStream to String
提问by Blanca Hdez
I have been trying to get an input stream reading a file, which isa plain text and has embeded some images and another files in base64and write it again in a String. But keeping the encoding, I mean, I want to have in the String something like:
我一直试图让一个输入流读取一个文件，它是一个纯文本，并嵌入了一些图像和另一个文件，base64并再次写入一个字符串。但是保持编码，我的意思是，我想在 String 中有类似的东西：
/9j/4AAQSkZJRgABAQEAYABgAAD/2wBDAAoHBwgHBgoICAgLCgoLDhgQDg0NDh0VFhEYIx8lJCIf
IiEmKzcvJik0KSEiMEExNDk7Pj4+JS5ESUM8SDc9Pjv/2wBDAQoLCw4NDhwQEBw7KCIoOzs7Ozs7
I have been trying with the classes Base64InputStreamand more from packages as org.apache.commons.codecbut I just can not fiugure it out. Any kind of help would be really appreciated. Thanks in advance!
我一直在尝试使用Base64InputStream包中的类和更多内容，org.apache.commons.codec但我无法弄清楚。任何形式的帮助将非常感激。提前致谢！
Edit
编辑
Piece of code using a reader:
使用阅读器的一段代码：
BufferedReader br= new BufferedReader(new InputStreamReader(bodyPart.getInputStream()));
StringBuilder sb = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
sb.append(line);
}
br.close();
Getting as a result something like: .DIC;??C;("(;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;?à@@"??
结果如下： .DIC;??C;("(;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;?à@@"??
采纳答案by Blanca Hdez
I found the solution, inspired by this post getting base64 content string of an image from a mimepart in Java
我找到了解决方案，灵感来自这篇文章从 Java 中的 mimepart 获取图像的 base64 内容字符串
I think it is kind of stupid decode and encode again the base64 code, but it is the only way I found to manage this issue. If someone could give a better solution, it would be also really appreciated.
我认为这是一种愚蠢的解码和再次编码 base64 代码，但这是我发现管理此问题的唯一方法。如果有人可以提供更好的解决方案，也将不胜感激。
Thanks
谢谢
回答by sufinawaz
Have you tried doing this:
你有没有试过这样做：
final byte[] bytes64bytes = Base64.encodeBase64(IOUtils.toByteArray(is));
final String content = new String(bytes64bytes);
final byte[] bytes64bytes = Base64.encodeBase64(IOUtils.toByteArray(is));
final String content = new String(bytes64bytes);
回答by Denys Séguret
A text file containing some base64 data can be read with the charset of the rest of the file.
可以使用文件其余部分的字符集读取包含一些 base64 数据的文本文件。
Base64 encodingis a mean to encode bytes in a limited set of characters that are unchanged with almost all char encodings, for example ASCII or UTF-8.
Base64 编码是一种在有限的字符集中对字节进行编码的方法，这些字符几乎与所有字符编码（例如 ASCII 或 UTF-8）都保持不变。
Base64 isn't a charset encoding, you don't have to specify you have some base64 encoded data when reading a file into a string.
Base64 不是字符集编码，在将文件读入字符串时，您不必指定您有一些 base64 编码的数据。
So if your text file is generally UTF-8 (that's probable), you can read it without problem even if it contains a base64 encoded stream. Simply use a basic reader and don't use a Base64InputStream if you don't want to decode it.
因此，如果您的文本文件通常是 UTF-8（很有可能），那么即使它包含 base64 编码流，您也可以毫无问题地读取它。如果您不想解码，只需使用基本阅读器，不要使用 Base64InputStream。
When opening a file with a reader, you have to specify the encoding. If you don't know it, I suggest you test with the probable ones, like UTF-8, US-ASCIIor ISO-8859-1.
使用阅读器打开文件时，必须指定 encoding。如果你不知道，我建议你用可能的来测试，比如UTF-8,US-ASCII或ISO-8859-1。
回答by Badal
If you have a normal InputStream object than You can directly get Base64 encoded stream from it using apache common library class Base64InputStreamconstructor
如果您有一个普通的 InputStream 对象，您可以使用 apache 公共库类Base64InputStream构造函数直接从中获取 Base64 编码的流
