java实现image和base64互转

java安装的目录下的jre/lib/rt.jar中有以下两个类实现base64的编码和解码：

sun.misc.BASE64Encoder

sun.misc.BASE64Decoder

下面是java实现：

public class Imagebase64 {

static BASE64Encoder encoder = new sun.misc.BASE64Encoder();

static BASE64Decoder decoder = new sun.misc.BASE64Decoder();

public static void main(String[] args) {

System.out.println(getImageBinary()); // image to base64

base64StringToImage(getImageBinary()); // base64 to image

}

static String getImageBinary() {

File f = new File("d://in.jpg");

try {

BufferedImage bi = ImageIO.read(f);

ByteArrayOutputStream baos = new ByteArrayOutputStream();

ImageIO.write(bi, "jpg", baos);

byte[] bytes = baos.toByteArray();

return encoder.encodeBuffer(bytes).trim();

} catch (IOException e) {

e.printStackTrace();

}

return null;

}

static void base64StringToImage(String base64String) {

try {

byte[] bytes1 = decoder.decodeBuffer(base64String);

ByteArrayInputStream bais = new ByteArrayInputStream(bytes1);

BufferedImage bi1 = ImageIO.read(bais);

File f1 = new File("d://out.jpg");

ImageIO.write(bi1, "jpg", f1);

} catch (IOException e) {

e.printStackTrace();

}

}

}