java1.8 获取本地图片转base64,base64转图片

可以使用Java 1.8中的Base64类来实现本地图片与base64之间的转换。具体步骤如下：

1. 将本地图片转换为byte数组：

File file = new File("图片路径");
BufferedInputStream inputStream = new BufferedInputStream(new FileInputStream(file));
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while ((len = inputStream.read(buffer)) != -1) {
    outputStream.write(buffer, 0, len);
}
byte[] data = outputStream.toByteArray();

2. 将byte数组转换为base64字符串：

String base64 = Base64.getEncoder().encodeToString(data);

3. 将base64字符串转换为byte数组：

byte[] data = Base64.getDecoder().decode(base64);

4. 将byte数组转换为图片并保存到本地：

FileOutputStream outputStream = new FileOutputStream("保存路径");
outputStream.write(data);
outputStream.flush();
outputStream.close();