java如何使用base64生成图片文件

import org.apache.commons.codec.binary.Base64;

public static void decodeFile(String base64Str,File file) throws Exception {
    FileOutputStream write = null;
    try {
        write = new FileOutputStream(file);
        byte[] decoderBytes = Base64.decodeBase64(content.getBytes("UTF-8"));
        write.write(decoderBytes);

    } catch (Exception e) {
        e.printStackTrace();
        throw e;
    }finally {
        try {
            if(write!=null)write.flush();
            if(write!=null)write.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}