使用Jackson（或Spring）解码Base64 [英] Decode Base64 with Jackson (or Spring)

问题描述

这是我第一次尝试处理二进制数据，所以我对此很陌生。
我正在写一个用于上传内容的REST服务，我将收到一个Base64编码的字符串。

This is the first time that I try to handle binary data so I'm quite new to this. I'm writing a REST service for uploading stuff, and I'm going to receive a Base64 encoded String.

我发现这个 （标准Java），我也发现了一个内部的Spring类（坏主意）。

I've found this (standard Java), and I've also found an internal Spring class (bad idea).

是否有一个Jackson注释来自动解码Base64中的属性？
我应该在我的对象中使用String还是byte []？

Is there a Jackson annotation to automatically decode a property from Base64? Should I use String or byte[] in my Object?

我也使用Spring MVC 3，所以可以从执行此操作的Spring框架。

I'm also using Spring MVC 3, so it will be ok to have a class from the Spring framework to do this.

[请，没有Apache Commons。我想找到一个没有添加更多东西的解决方案]

[please, no Apache Commons. I would like to find a solution without adding more stuff]

推荐答案

使用 byte [] 用于属性，Base64编码/解码只是工作。没有别的办法。

Use byte[] for property, and Base64 encoding/decoding "just works". Nothing additional to do.

此外，杰克逊可以通过以下方式进行显式转换：

Additionally, Jackson can do explicit conversion by something like:

ObjectMapper mapper = new ObjectMapper();
byte[] encoded = mapper.convertValue("Some text", byte[].class);
String decoded = mapper.convertValue(encoded, String.class);

如果你想使用Jackson进行独立的Base64编码/解码。

if you want to use Jackson for stand-alone Base64 encoding/decoding.

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