java實作圖檔與base64轉換

如果你是一個軟體開發，不論前端後端工程師，圖檔的處理你是肯定要會的，關于圖檔的Base64編碼，你可能有點陌生，但是這是一個軟體工程師應該要掌握的知識點，現在很多網友把圖檔與base64轉換都做成了小工具如：

www.yzcopen.com/img/imgbase64

今天我們就一起來看一下吧。

base64編碼 是将資料用 64 個可列印的字元進行編碼的方式，任何資料底層實作都是二進制，

是以都可以進行 base64編碼，base64編碼 主要用在資料傳輸過程中（編碼、解碼）。

而 Data URI 是将資料用 URI 的形式進行展現。常用的是将圖檔進行 base64 編碼，

用 Data URI 的形式進行展現，可以說，base64編碼後的字元串是某些 Data URI（這裡就包括圖檔的 base64 URL) 的一部分。

（圖檔轉 Base64碼 之後是通過 Data URI scheme來實作顯示的）

Base64編碼是一種圖檔處理格式，通過特定的算法将圖檔編碼成一長串字元串，在頁面上顯示的時候，可以用該字元串來代替圖檔的url屬性。

下面我們用java實作圖檔轉base64：

代碼如下：

public class mainTest {

public static void main(String[]args) throws Exception {

          InputStream in = new FileInputStream(new File("您的圖檔路徑")); 
          String str = ImageToBase64ByStream(in);
          System.out.println(str);
}

/**
         * 檔案流生成base64
         * @param imgFile    
         * @return
         */
        public static String ImageToBase64ByStream(InputStream in) {
            // 将圖檔檔案轉化為位元組數組字元串，并對其進行Base64編碼處理
            byte[] data = null;
            // 讀取圖檔位元組數組
            try {
                data = new byte[in.available()];
                in.read(data);
                in.close();
                BASE64Encoder encoder = new BASE64Encoder();
                return encoder.encode(data);// 傳回Base64編碼過的位元組數組字元串
            } catch (IOException e) {
                e.printStackTrace();
            }
            // 對位元組數組Base64編碼
            return null;
        }
           

}

通過上面代碼我們會得到一大段編碼如：

iVBORw0KGgoAAAANSUhEUgAAApcAAAF2CAYAAAA7nLMrAAAAAXNSR0IArs4c6QAAAARnQU1BAACx

jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAD7PSURBVHhe7d0LtCVVfedxJjMrOmsmazS6dBSF

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JhZCAAEE/AUeeughxQ8G9AH6QK/2AcKl//mCJRFAAAEvATmh8EIAAQR6VYBw2astz34jgEBhAoTL

wmgpGAEEKiBAuKxAI1FFBBColgDhslrtRW0RQCCsAOEyrCelIYAAAtH1lrwQQACBXhUgXPZqy7Pf

CCBQmADhsjBaCkYAgQoIEC4r0EhUEQEEqiVAuKxWe1FbBBAIK0C4DOtJaQgggADT4vQBBBDoaQHC

ZU83PzuPAAJFCDByWYQqZSKAQFUECJdVaSnqiQAClREgXFamqagoAggUIEC4LACVIhFAoLcFCJe9

3f7sPQK9LkC47PUewP4jgEBwAcJlcFIKRACBCgkQLivUWFQVAQSqIUC4rEY7UUsEEChGgHBZjCul

IoBADwsQLnu48dl1BBBQhEs6AQIIIBBYgHAZGJTiEECgUgKEy0o1F5VFAIEqCBAuq9BK1BEBBIoS

IFwWJUu5CCDQswKEy55tenYcAQRqAoRLugECCCAQWIBwGRiU4hBAoFIChMtKNReVRQCBKggQLqvQ

StQRAQSKEiBcFiVLuQgg0LMChMuebXp2HAEEmBanDyCAAALhBQiX4U0pEQEEqiPAyGV12oqaIoBA

RQQIlxVpKKqJAAKFCBAuC2GlUAQQ6GUBwmUvtz77jgAC/x+9e45fD6F8igAAAABJRU5ErkJggg==

使用：

// Base64 在CSS中的使用

.box{

background-image: url("data:image/jpg;base64,/9j/4QMZR...");

// Base64 在HTML中的使用

以上編碼是我通過：www.yzcopen.com/img/imgbase64進行圖檔轉換得到的結果