android 用UDP做的心跳连接 小示例

 

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设备：客户端，服务端
机制：UDP
心跳思路：
1.自检，检测自身是否连接网络
2.检测对方是否发来信息，自身是否接收到

 

public class ServerHeartService extends Service {      private WifiManager wifiManager=null;  //用来检测自身网络是否连接      private boolean isConnected;      private static int errorNum = 0; //用于一次连接不成功后记录，并且，记录到4次后再对程序进行提示         private static final String TAG = "ServerHeartService";      private String getMsg = "";         private int _getPort = 7894;      private int _sendPort = 5489;      private String _partnerIP;      private static  boolean   ServerFlag = false;      private int num = 1;      private Thread thread;      private DatagramSocket socket;      private boolean passFlag = false;         private int length = 1;         @Override      public IBinder onBind(Intent intent) {          return null;      }         @Override      public void onCreate() {          Log.v(TAG, "In Server onCreate");      }         @Override      public void onDestroy() {          System.out.println("DestoryJoinnerUdp");          thread.stop();          super.onDestroy();      }         @Override      public void onStart(Intent intent, int startId) {          super.onStart(intent, startId);          thread = new Thread(new Runnable() {          @Override            public void run() {                  while(true){                      try {                         //1.自测wifi是否正常                          isConnected = isWifiConnect();                          if(isConnected == false){                              if(length == 1){                                  //不能直接在Service上通知，必须经过Handler去提示                                  Message heartMessage = ServerTestingActivity.heartHandler.obtainMessage();                                  heartMessage.arg1 = 1;                                  ServerTestingActivity .heartHandler.sendMessage(heartMessage);                                  //因为是多线程，防止多次发送Handler                                  length ++;                              }                              break;                          }                             SendMsg();                          GetMsg();                          //用于调试，可删除                          String msg = "";                          if( ServerFlag == false){                              msg = "false";                          }else{                              msg = "true";                          }                          Log.d("ServerFlag", msg);                          //记录未接收到客户端发来的消息 +1                          if( ServerFlag == false){                              errorNum ++;                          }else{                              errorNum = 0;                          }                             if(errorNum == 4){                              ServerHeartMsg("客户端网络故障！");                              break;                          }                      }catch(Exception e){                          e.printStackTrace();                      }                  }              }          });          thread.start();      }      private boolean isWifiConnect(){          try{              ConnectivityManager conManager = (ConnectivityManager)getSystemService(CONNECTIVITY_SERVICE);              NetworkInfo mWifi = conManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);              return mWifi.isConnected();          }catch(Exception e){              return false;          }  }     // 将控制信息已广播的形式发送到Activity.      private void ServerHeartMsg(String str) {          final Intent intent = new Intent();          intent.setAction(Constants.Controller.UDP_BORADCAST);          intent.putExtra(UDPData.UDP_HEART_ERROR, str);          sendBroadcast(intent);      }         public void GetMsg() throws IOException, InterruptedException{          try {              socket = new DatagramSocket(_getPort);              Log.d(TAG, "Server连接到端口");              byte data[] = new byte[256];              DatagramPacket packet = new DatagramPacket(data, data.length);          if(passFlag == false){              socket.setSoTimeout(100000);          }else{              socket.setSoTimeout(3000);          }          socket.receive(packet);          controlFlag = true;          passFlag = true;          Log.d(TAG, "Server接收到信息");          getMsg = new String(packet.getData(), packet.getOffset(), packet.getLength());          socket.close();      } catch (SocketException e) {          Log.d(TAG, "Server未找到服务器");          socket.close();          controlFlag = false;          e.printStackTrace();      } catch (UnknownHostException e) {          Log.d(TAG, "Server未连接到服务器");          socket.close();          controlFlag = false;          e.printStackTrace();      } catch (IOException e) {          Log.d(TAG, "Server消息未接收成功");          socket.close();          controlFlag = false;          e.printStackTrace();      }  }         public void SendMsg() throws IOException{          try {              Thread.sleep(1000);              socket = new DatagramSocket();              InetAddress serverAddress = InetAddress.getByName(客户端IP);              String str = "服务端网络故障！";              byte data[] = str.getBytes();              DatagramPacket packet = new DatagramPacket(data, data.length, serverAddress, _sendPort);              socket.send(packet);              Log.d(TAG, "Server消息发送成功");              socket.close();          } catch (SocketException e) {              Log.d(TAG, "Server未找到服务器");              socket.close();              e.printStackTrace();          } catch (UnknownHostException e) {              Log.d(TAG, "Server未连接到服务器");              socket.close();              e.printStackTrace();          } catch (IOException e) {              Log.d(TAG, "Server消息未发送成功");              socket.close();              e.printStackTrace();          } catch (InterruptedException e) {              Log.d(TAG, "Sleep线程");              socket.close();              e.printStackTrace();          }      }  }

 

 

Server端接收广播： -----> ServerTestActivity

 

//定义心跳广播      private BroadcastReceiver udpHeartReceiver = new BroadcastReceiver() {          @Override           public void onReceive(Context context, Intent intent) {                  //因为只有连接失败才会发送广播，所以 getStringExtra 一定有值，所以不需要去 getStringExtra == null去做判断                  String udpHeart = intent.getStringExtra(UDPData.UDP_HEART_ERROR);                  //msgHeart = udpHeart;                  Toast.makeText(getApplicationContext(), udpHeart,Toast.LENGTH_SHORT).show();              }      };

 

 

 

 

//注册心跳      IntentFilter filter2 = new IntentFilter();      filter2.addAction(Constants.Controller.UDP_BORADCAST);      registerReceiver(udpHeartReceiver, filter2);         //启动心跳      intentService = new Intent();      intentService.setClass(this, ControllerHeartService.class);      startService(intentService);         //停止心跳      stopService(intentService);

 

 

 

客户端同理，可自已写下，在这里我就不贴代码了