我正在研究GCM。
我可以从本地服务器向所有注册的Android设备发送通知。
我在数据库中保存了regid和userid。我的要求是向特定设备发送通知。如何做到这一点？
我在服务器端使用java。任何答案都会节省我..我发布的服务器端代码
server side code
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 = "AIzaSyDzlDr2viv-EghBFZGpjwXcDoqh24Wt9yE";
static final String MESSAGE_KEY = "message";
static final String TITLE_KEY = "title";
static final String IMAGE_KEY= "image";
static final String ORDER_KEY= "order";
private List<String> androidTargets = new ArrayList<String>();
public GCMNotification() {
super();
// androidTargets.add(re);
}
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
//doPost(request, response);
Connection con=null;
try {
Class.forName("com.mysql.jdbc.Driver");
//Get a connection to the particular database
con=DriverManager.getConnection(
"jdbc:mysql://localhost:3306/my_db","root","root1");
String sql;
sql = "SELECT regid, fname, email FROM my_db.Persons";
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(sql);
while(rs.next()){
//Retrieve by column name
int id = rs.getInt("regid");
String first = rs.getString("fname");
String last = rs.getString("email");
androidTargets.add(id);
}
rs.close();
stmt.close();
con .close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
//MulticastResult result = null;
//Result result1=null;
Writer writer=null;
Connection con=null;
PrintWriter out = response.getWriter();
String share = request.getParameter("shareRegId");
// GCM RedgId of Android device to send push notification
String reg = "";
String emailId="";
String fname="";
if (share != null && !share.isEmpty()) {
reg = request.getParameter("regId");
emailId=request.getParameter("email");
fname=request.getParameter("name");
System.out.println("regId: " + reg);
System.out.println("mailid " + emailId);
System.out.println("name "+ fname);
try {
//Load the Driver for connection
Class.forName("com.mysql.jdbc.Driver");
//Get a connection to the particular database
con=DriverManager.getConnection(
"jdbc:mysql://localhost:3306/my_db","root","root1");
PreparedStatement pst=con.prepareStatement("insert into my_db.Persons(regid,email,fname) values(?,?,?)");
pst.setString(1,reg);
pst.setString(2,emailId);
pst.setString(3,fname);
int i = pst.executeUpdate();
if(i!=0){
pw.println("<br>Record has been inserted");
}
else{
pw.println("failed to insert the data");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
MulticastResult result1=null;
String userMessage = request.getParameter("message");
String imageUrl = request.getParameter("image");
String order1=request.getParameter("odt");
String titl=request.getParameter("tit");
Sender sender = new Sender(GOOGLE_SERVER_KEY);
Message message = new Message.Builder().timeToLive(10000)
.delayWhileIdle(false)
.addData(TITLE_KEY, titl)
.addData(MESSAGE_KEY,userMessage)
.addData(IMAGE_KEY, imageUrl)
.addData(ORDER_KEY, order1)
.build();
try {
// use this for multicast messages. The second parameter
HashSet<String> set = new HashSet<String>(androidTargets);
// Create ArrayList from the set.
ArrayList<String> result = new ArrayList<String>(set);
System.out.println("reg2:"+result);
// of sender.send() will need to be an array of register ids.
result1 = sender.send(message, result,1);
/* if (result1.getResults() != null) {
int canonicalRegId = result1.getCanonicalIds();
if (canonicalRegId != 0) {
}
} else {
int error = result1.getFailure();
System.out.println("Broadcast failure: " + error);
}*/
} catch (Exception e) {
e.printStackTrace();
}
request.setAttribute("pushStatus", result1.toString());
request.getRequestDispatcher("index.jsp")
.forward(request, response);
}
}
答案 0 :(得分：1)
只需在sql查询中添加where子句即可筛选出您想要处理的确切用户。如果您想通过电子邮件过滤用户，请使用类似的内容..
sql = "SELECT regid, fname, email FROM my_db.Persons where email = 'abc@gmail.com'";