如何从Java Restful服务器向GCM服务器发送消息

debugcn 发表于 Dev

伊曼纽尔·古瑟（Emmanuel Guther）

我有一个Java Restful Web服务（1）和一个使用它的Android应用程序（2）。第三个应用程序负责通过Web服务将数据输入数据库。我希望当第三个应用程序在我的数据库中输入新数据时，Web服务通过GCM通知android应用程序。我的Android应用程序能够接收reg-Id GCM。（我已经在Google Developers等服务器API密钥中创建了项目。）

我尝试了这一点：当第三个应用访问URI以通过POST输入数据时，将消息发送到google服务器。不起作用

@POST
@Override
@Consumes({"application/xml", "application/json"})
public void create(Usuarios entity) {
 String deviceId=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX...;

Sender sender = new Sender("AIzaSyXXXXXXXXXXXXXXXXXXXXXXXXXXX");
 Message message = new Message.Builder()
.addData("message", "this is the message")
.addData("other-parameter", "some value")
.build();

  Result result = sender.send(message, deviceId, 3);

    super.create(entity);
}

我也曾尝试创建一个servlet。但是不起作用

@WebServlet(name = "NewServlet_1", urlPatterns = {"/NewServlet_1"})
public class NewServlet extends HttpServlet {

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");
    try (PrintWriter out = response.getWriter()) {

        out.println("<!DOCTYPE html>");
        out.println("<html>");
        out.println("<head>");
        out.println("<title>Servlet NewServlet</title>");            
        out.println("</head>");
        out.println("<body>");
        out.println("<h1>Servlet NewServlet at " + request.getContextPath() + "</h1>");
        out.println("</body>");
        out.println("</html>");
    }
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {    
    processRequest(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
   Sender sender = new Sender("AIzaSyBNFur3sFJpMujkVYW9rzEq3udI0khRCOI");
 Message message = new Message.Builder()
.addData("message", "this is the message")
.addData("other-parameter", "some value")
.build();
  Result result = sender.send(message, "xxxxxxxxxxxx", 3);

    processRequest(request, response);
}

@Override
public String getServletInfo() {
    return "Short description";
}// </editor-fold>

}

一些想法？

尼尔玛·达拉（Nirmal dhara）

可能是您已经解决了问题。但这对其他人有帮助，所以我发布了答案。

选择任何休息客户（球衣休息客户）或常规的HTTP URL帖子。

将请求发布到https://android.googleapis.com/gcm/发送网址

将两个变量设置为http标头

授权：key = YOUR_API_KEY内容类型：application / json

有效负载json应该如下所示。

 {
      "registration_ids" : ["APA91bHun4MxP5egoKMwt2KZFBaFUH-1RYqx..."],
      "data" : {
        ///your data goes here 
      },
    }

例子

  { "data": {
        "score": "5x1",
        "time": "15:10"
      },
      "registration_ids": ["4", "8", "15", "16", "23", "42"]
    }

注意-registration_ids是设备注册ID。

现在发布到其余部分。

有关更多信息，请检查此。

样例代码

包com.ajs.ajstest.gcmpost;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;

/ ** * * @author nirmal * /公共课程GCMPost {

public static void main(String ar[]) throws UnsupportedEncodingException, IOException{
HttpClient httpclient = new DefaultHttpClient();

    String json="{ \"data\": {" +
                "    \"score\": \"5x1\"," +
                "    \"time\": \"15:10\"" +
                "  }," +
                "  \"registration_ids\": [\"4\", \"8\", \"15\", \"16\", \"23\", \"42\"]" +
                "}";
    HttpPost httpost = new HttpPost("https://android.googleapis.com/gcm/send");
httpost.setHeader("Content-Type", "application/json");
httpost.setHeader("Authorization","YOUR_API_KEY");

httpost.setEntity(new StringEntity(json));
HttpResponse response = httpclient.execute(httpost);
}

}

行家依赖

<dependency>
  <groupId>org.apache.httpcomponents</groupId>
  <artifactId>httpclient</artifactId>
  <version>4.3.6</version>
  <type>jar</type>
 </dependency>

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