java - 如何在Java中生成签名并在jQuery(Cloudinary)中使用它？

我正在尝试使用jQuery和Java将图像上传到Cloudinary。我没有运气就尝试过link中的代码。生成签名时出现错误。
有人有生成签名的有效实现示例吗？那会更有帮助。

最佳答案

将以下代码放入index.jsp中：

<html>
        <head>
            <title></title>
            <script src='jquery.min.js' type='text/javascript'></script>
            <script src='jquery.ui.widget.js' type='text/javascript'></script>
            <script src='jquery.iframe-transport.js' type='text/javascript'></script>
            <script src='jquery.fileupload.js' type='text/javascript'></script>
            <script src='jquery.cloudinary.js' type='text/javascript'></script>
            <script type = "text/javascript">
                $.cloudinary.config({ cloud_name: 'sample', api_key: '874837483274837'});
            </script>
        </head>
        <body>
            <input name="file" type="file"
               class="cloudinary-fileupload" data-cloudinary-field="image_id"
               data-form-data="${signedData}" />
        </body>
    </html>

如果您有一个Maven项目，则将这些依赖项放在pom.xml中，或者下载它们的jar并将其放在“ lib”文件夹中。

<dependency>
    <groupId>org.json</groupId>
    <artifactId>json</artifactId>
    <version>20090211</version>
</dependency>
<dependency>
    <groupId>commons-codec</groupId>
    <artifactId>commons-codec</artifactId>
    <version>1.4</version>
</dependency>

最后创建一个Servlet，如下所示：

import org.apache.commons.codec.digest.DigestUtils;
import org.json.JSONObject;

public class SignRequestServlet extends HttpServlet{

    public void doGet(HttpServletRequet request, HttpServletResponse response) throws ServletException, IOException{

        long unixTime = System.currentTimeMillis() / 1000L;
        String unsignedData = "&quot;api_key&quot;:&quot;874837483274837&quot;,&quot;timestamp&quot;:&quot;" + unixTime + "&quot;";
        String unsignedDataForSHA = "timestamp="+unixTime;
        String apiSecret = "-----place your api secret here-----";
        String unsignedDataSecret = unsignedDataForSHA + apiSecret;
        String signedData = unsignedData + ",&quot;signature&quot;:&quot;" + DigestUtils.shaHex(unsignedDataSecret.getBytes()) + "&quot";

        JSONObject jsonObject = new JSONObject("{" + signedData.replaceAll("&quot;", "\"") + "}");

        request.setAttribute("signedData", jsonObject.toString());
        request.getRequestDispatcher("/index.jsp").forward(request,response);
    }

    public void doPost(HttpServletRequet request, HttpServletResponse response) throws ServletException, IOException{

        doGet(request, response);
    }
}

切记：替换Cloudinary控制台主页中提供的api-key，cloud-name和api-secret。另外，您可能需要更改index.jsp中.js文件的位置。