Question

我编写了一个程序，使用jsp在Android中实现Google Cloud Messaging。从这里得到了参考（http://javapapers.com/android/google-cloud-messaging-gcm-for-android-and-push-notifications/）。但是当我点击index.jsp页面上的“通过GCM发送推送通知”页面

时，我收到错误

“”需要RegId：java.io.FileNotFoundException：GCMRegId.txt（系统找不到指定的文件）“”

这是定义了GCMRegId.txt的文件，但服务器找不到该文件，因此如果有人实施了GCM，可以建议我需要做哪些更改。

@WebServlet("/GCMNotification")
public class GCMNotification extends HttpServlet {

private static final long serialVersionUID = 1L;

// Put your Google API Server Key here
private static final String GOOGLE_SERVER_KEY = "My Server Key";
static final String MESSAGE_KEY = "message";

public GCMNotification() {
    super();
}

protected void doGet(HttpServletRequest request, HttpServletResponse response)throws                                
ServletException, IOException {
    doPost(request, response);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws                 ServletException,IOException { 

    Result result = null;

    String share = request.getParameter("shareRegId");

    // GCM RedgId of Android device to send push notification
    String regId = "";
    if (share != null && !share.isEmpty()) {
        regId = request.getParameter("regId");
        PrintWriter writer = new PrintWriter("GCMRegId.txt");
        writer.println(regId);
        writer.close();
        request.setAttribute("pushStatus", "GCM RegId Received.");
        request.getRequestDispatcher("index.jsp").forward(request, response);
    } else {

        try {
            BufferedReader br = new BufferedReader(new FileReader("GCMRegId.txt"));
            regId = br.readLine();
            br.close();
            String userMessage = request.getParameter("message");
            Sender sender = new Sender(GOOGLE_SERVER_KEY);
            Message message = new Message.Builder().timeToLive(30).delayWhileIdle(true)
                    .addData(MESSAGE_KEY, userMessage).build();
            System.out.println("regId: " + regId);
            result = sender.send(message, regId, 1);
            request.setAttribute("pushStatus", result.toString());
        } catch (IOException ioe) {
            ioe.printStackTrace();
            request.setAttribute("pushStatus", "RegId required: " + ioe.toString());
        } catch (Exception e) {
            e.printStackTrace();
            request.setAttribute("pushStatus", e.toString());
        }
        request.getRequestDispatcher("index.jsp").forward(request, response);
    }
}

}

解决错误需要一些帮助感谢你

RegId要求：java.io.FileNotFoundException：GCMRegId.txt（系统找不到指定的文件）

0 个答案: