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

大山

我编写了一个程序，使用jsp在android中实现Google Cloud Messaging。从这里获得了参考（http://javapapers.com/android/google-cloud-messaging-gcm-for-android-and-push-notifications/）当我尝试在Windows中运行程序时，我无法在服务器上运行我的日食给了我GCMRegId.txt丢失的错误。这是代码：

 GCMNotification.java

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

private static final String GOOGLE_SERVER_KEY = "AIzaSyDA5dlLInMsasJEUTIHV0u7maB82MCasdU";
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 = "APA91bG6cLX8OYyZDRypuRq6uodZ9PuMfiql9k6K66i9hZFnS5xr-QmT13nRozGQ10KXNmcMqbsLCVUIS9joGiOPasdfghjklp_AmH2iNs1YVqY3IYzgHoQ";
    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);
    }
}

JSP页面：index.jsp

  <head>
 </head>
 <body>

<h1>Google Cloud Messaging (GCM) Server in Java</h1>
 <%
String pushStatus = "";
Object pushStatusObj = request.getAttribute("pushStatus");

if (pushStatusObj != null) {
    pushStatus = pushStatusObj.toString();
}
 %>
<form action="GCMNotification" method="post">

    <div>
          <textarea rows="2" name="message" cols="23"
          placeholder="Message to transmit via GCM"></textarea>
    </div>
    <div>
        <input type="submit" value="Send Push Notification via GCM" />
    </div>
</form>
<p>
    <h3>
        <%=pushStatus%>
    </h3>
</p>

它总是给我类似所需的RegId的错误：java.io.FileNotFoundException：GCMRegId.txt（系统找不到指定的文件）我该如何解决该错误？

大山

嘿，我解决了这个问题。GCMRegId.txt文件自动生成。不手动制作该文件。

或者，如果您不想制作GCMRegId.txt文件，只需从代码中删除，然后将DeviceId传递给regID（string）并删除未使用的代码。

您将获得输出。谢谢。

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