在JSON中发送时如何格式化Base64编码的字符串

时间：2018-08-03 20:25:35

标签： javascript java groovy base64 string-formatting

当我在JSON请求中发送以下字符串时，我想格式化base64编码的字符串-我收到JSON验证错误，因为此字符串的格式不正确。我找不到能将base64编码的字符串转换为正确的字符串的有用工具。

Java / Groovy或Javascript中是否有任何实用程序可用于单行格式化。

感谢您的帮助

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}

3 个答案:

答案 0 :(得分：0)

// if this is your Base64 encoded string
var str = 'VGhpcyBpcyBhbiBhd2Vzb21lIHNjcmlwdA=='; 

// make URL friendly:
str = str.replace(/\+/g, '-').replace(/\//g, '_').replace(/\=+$/, '');

// reverse to original encoding
str = (str + '===').slice(0, str.length + (str.length % 4));
str = str.replace(/-/g, '+').replace(/_/g, '/');

如果通过格式化意味着使它对URL友好，那么代码之上！

如果您是指字符串的编码和解码，

您可以使用btoa()和atob()在base64编码之间进行转换

答案 1 :(得分：0)

如果我理解得很好，那么使用base64字符串制作有效的JSON就会遇到问题。

我建议这样做：
使用JavaScript函数 JSON.stringify(encodedData)返回一个转义的字符串，之后您可以在JSON中使用它而没有任何问题。

答案 2 :(得分：0)

编码的数据是PDF文件，因此它是二进制数据，您不应尝试将其转换为字符串。

例如，通过将字节写入文件来处理字节。在Groovy中：

// String s = <your JSON>

Byte[] b = new groovy.json.JsonSlurper().parseText(s) // no errors here, the JSON  you supplied is valid
 ."data" // GPath syntax for getting the "data" element in the JSON
 .replaceAll (/\s/, "") // remove spaces and newlines
 .decodeBase64() // returns an array of Byte

new File("somefile.pdf").bytes = b

打开somefile.pdf，我可以看到：

Adobe Acrobat PDF Files Adobe Portable Document Format (PDF) is a universal file format that preserves allof the fonts, formatting, colours and graphics of any source document, regardless ofthe application and platform used to create it. ...

如果编码后的数据实际上是字符串，则可以通过String x = new String(b)来获取原始字符串。

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