如何用java实现图片与base64转换

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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：

http://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： iVBORw0KGgoAAAANSUhEUgAAApcAAAF2CAYAAAA7nLMrAAAAAXNSR0IArs4c6QAAAARnQU1BAACx jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAD7PSURBVHhe7d0LtCVVfedxJjMrOmsmazS6dBSF mIQgmpFEVh4+ZobECKOoEw3MuJiYCURDdCRkJfYMkYiEBDVtAjgyGl7pS/qV5iG4kAa6oZGhaeiG HmibGJB+0H37dft17+2+79ee86979r377LOraledXedUnfM9a93Vj1u1a9dn71P1O3tX1TlF8UIA 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