將 Base64 字符串轉換為字符串數組

Question

我正在使用 request.getParameter 並獲取此值：

[
  "data:image/jpeg;base64,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",
  "data:image/jpeg;base64,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"
]

如何將其轉換為數組？

當我使用request.getParameterValues("jsondata"); 我得到這個值[Ljava.lang.String;@8892fd8 ，這不是預期的。

Answer 1

jsondata值是 JSON 文本。 它以[開頭，這意味着它是一個 JSON 數組。

要處理它，您應該使用 JSON 解析器。 請參閱如何在 Java 中解析 JSON 。

一旦你解析了它，你應該有一個String[]或一個List<String> ，有 2 個值。

兩個值都以data:image/jpeg;base64,開頭data:image/jpeg;base64,后跟 Base-64 編碼的二進制數據（JPEG 圖像）。

假設您有 Java 8 或更高版本，請使用Base64類解碼為byte[] 。

您現在擁有 2 個 JPEG 圖像，采用 2 個字節數組的形式。