¹ 最简单的方法如下：

String str = "data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAA...";
byte[] imagedata = DatatypeConverter.parseBase64Binary(str.substring(str.indexOf(",") + 1));
BufferedImage bufferedImage = ImageIO.read(new ByteArrayInputStream(imagedata));
ImageIO.write(bufferedImage, "png", new File("img.png"));

Notes

1. 为了使用类 javax.xml.bind.DatatypeConverter ，你需要Java 6 o更多。

1. In order to use the class javax.xml.bind.DatatypeConverter, you need Java 6 o greater.