图片转base64工具

1. Base64 工具，可将文件与base64互转

**
 * @Author: guc
 * @Description: 图片Base64处理工具
 * @Date: 2020/8/14 11:08
 * @Version: 1.0
 */
public class Base64Utils {
    /**
     * @param path 文件路径
     * @return base64字符串
     */
    public static String picture2Base64(String path){
        File file = new File(path);
        String base64="";
        FileInputStream inputStream;
        ByteArrayOutputStream out;
        try {
            inputStream = new FileInputStream(file);
            out= new ByteArrayOutputStream();
            byte[] buffer = new byte[1024 * 4];
            int n = 0;
            while ((n = inputStream.read(buffer)) != -1) {
                out.write(buffer, 0, n);
            }
            byte[] pics = out.toByteArray();
            base64 = Base64.getEncoder().encodeToString(pics);
            out.flush();
            out.close();
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
            return "FileNotFoundException";
        }
        return base64;
    }

    /**
     *
     * @param base64  base64字符串
     * @param filePath  保存文件路径
     * @return 保存的文件
     */
    public static File base642Picture(String base64,String filePath){
        File file = new File(filePath);
        FileOutputStream out;
        try {
            file.getParentFile().mkdirs();
            file.createNewFile();
            out = new FileOutputStream(file);
            byte[] picBytes = Base64.getDecoder().decode(base64);
            out.write(picBytes);
            out.flush();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
        return file;
    }
}

注意：需java1.8及以上