代码示例
package demo;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Objects;
public class Base64Demo {
public static void main(String[] args) {
// image -> base64
String base64 = ImageToBase64("src/main/resources/baidu.png");
System.out.println(base64);
// base64 -> image
Base64ToStream(base64);
}
public static byte[] readImage(String imgPath) {
byte[] data = null;
InputStream in = null;
// 读取图片字节数组
try {
in = new FileInputStream(imgPath);
data = new byte[in.available()];
in.read(data);
in.close();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return data;
}
public static void saveImage(byte[] imageByte){
InputStream input = null;
try {
//转化成流
input = new ByteArrayInputStream(imageByte);
BufferedImage bi = ImageIO.read(input);
File file = new File("temp.png");
ImageIO.write(bi, "png", file);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (input != null) {
try {
input.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
public static String ImageToBase64(String imgPath) {
byte[] data = readImage(imgPath);
// 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
return encoder.encode(Objects.requireNonNull(data));
}
public static void Base64ToStream(String base64) {
BASE64Decoder decoder = new BASE64Decoder();
byte[] imageByte = new byte[0];
try {
imageByte = decoder.decodeBuffer(base64);
} catch (IOException e) {
e.printStackTrace();
}
//图片类型
saveImage(imageByte);
}
}
参考
用java将本地图片转base64格式, 再转图片