如果你是一个软件开发，不论前端后端工程师，图片的处理你是肯定要会的，关于图片的Base64编码，你可能有点陌生，但是这是一个软件工程师应该要掌握的知识点，现在很多网友把图片与base64转换都做成了小工具如：
www.yzcopen.com/img/imgbase64

今天我们就一起来看一下吧。
base64编码 是将数据用 64 个可打印的字符进行编码的方式，任何数据底层实现都是二进制，
所以都可以进行 base64编码，base64编码 主要用在数据传输过程中（编码、解码）。
而 Data URI 是将数据用 URI 的形式进行展现。常用的是将图片进行 base64 编码，
用 Data URI 的形式进行展现，可以说，base64编码后的字符串是某些 Data URI（这里就包括图片的 base64 URL) 的一部分。
（图片转 Base64码 之后是通过 Data URI scheme来实现显示的）

Base64编码是一种图片处理格式，通过特定的算法将图片编码成一长串字符串，在页面上显示的时候，可以用该字符串来代替图片的url属性。

下面我们用java实现图片转base64：
代码如下：

public class mainTest {

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

          InputStream in = new FileInputStream(new File("您的图片路径")); 
          String str = ImageToBase64ByStream(in);
          System.out.println(str);
}

/**
         * 文件流生成base64
         * @param imgFile    
         * @return
         */
        public static String ImageToBase64ByStream(InputStream in) {
            // 将图片文件转化为字节数组字符串，并对其进行Base64编码处理
            byte[] data = null;
            // 读取图片字节数组
            try {
                data = new byte[in.available()];
                in.read(data);
                in.close();
                BASE64Encoder encoder = new BASE64Encoder();
                return encoder.encode(data);// 返回Base64编码过的字节数组字符串
            } catch (IOException e) {
                e.printStackTrace();
            }
            // 对字节数组Base64编码
            return null;
        }

}

通过上面代码我们会得到一大段编码如：

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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

以上编码是我通过：www.yzcopen.com/img/imgbase64进行图片转换得到的结果