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这篇文章主要介绍"怎么将InputStream转化为base64"，在日常操作中，相信很多人在怎么将InputStream转化为base64问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答"怎么将InputStream转化为base64"的疑惑有所帮助!接下来，请跟着小编一起来学习吧!

InputStream转化为base64项目经常会用到将文件转化为base64进行传输

怎么才能将文件流转化为base64呢，代码如下

/** * @author 李光光(编码小王子) * @date 2018年6月28日 下午2:09:26 * @version 1.0 */public class FileToBase64 { public static String getBase64FromInputStream(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 { ByteArrayOutputStream swapStream = new ByteArrayOutputStream(); byte[] buff = new byte[100]; int rc = 0; while ((rc = in.read(buff, 0, 100)) > 0) { swapStream.write(buff, 0, rc); } data = swapStream.toByteArray(); } catch (IOException e) { e.printStackTrace(); } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } return new String(Base64.encodeBase64(data)); }}把文件流转base64，然后前端展示base64图片java端

项目是基于springboot的。读取本地图片，转成base64编码字节数组字符串，传到前端。

这种传输图片的方式可以用于Java后台代码生成条形码二维码，直接转成base64传给前台展示。ps:（在传给前台的字符串前要加上data:image/png;base64,，这样html的img标签的src才能以图片的格式去解析字符串）

@RequestMapping("/login") public String login(Map map){ byte[] data = null; // 读取图片字节数组 try { InputStream in = new FileInputStream("E://aa.jpg"); data = new byte[in.available()]; in.read(data); in.close(); } catch (IOException e) { e.printStackTrace(); } // 对字节数组Base64编码 BASE64Encoder encoder = new BASE64Encoder(); // 返回Base64编码过的字节数组字符串 map.put("image",_"data:image/png;base64,"+ encoder.encode(Objects.requireNonNull(data))); return "login"; }html端

用的是thymeleaf模板引擎，只是单纯地展示base64编码的图片。

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