import org.apache.commons.codec.binary.Base64;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
public class ImageBase64Utils {
  /**
   * 将图片转换成Base64编码
   * @param imgFile 待处理图片地址
   * @return
   */
  public static String getImgBase(String imgFile) {
    // 将图片文件转化为二进制流
    InputStream in = null;
    byte[] data = null;
    // 读取图片字节数组
    try {
      in = new FileInputStream(imgFile);
      data = new byte[in.available()];
      in.read(data);
      in.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
    // 图片头
    //String imghead = "data:image/jpeg;base64,";
    return Base64.encodeBase64String(data);
  }
}

byte[] data = XXXXXX;
String s = Base64.encodeBase64String(data);