我已经使用驻留在android上的客户端和驻留在桌面上的服务器进行了套接字编程......每当服务器关闭时,我们知道客户端失去了连接......所以它会经历一个循环,直到它连接到服务器.......
这里的问题是在下面的代码
tabletclient = new Socket(SERVER_IP, TAB_SERVER_PORT);
在连接丢失的情况下的while循环中......但是当连接上它再次创建一个新对象............
谁能告诉我如何解决这个问题............
在客户端
while(true){
try {
tabletclient = new Socket(SERVER_IP, TAB_SERVER_PORT);
tabletout = new PrintWriter(tabletclient.getOutputStream());
in = new Scanner(tabletclient.getInputStream());
try
{
if((line = in.nextLine())!=null)
{
// my task to be done
}
}catch(Exception d){
System.out.println("Connection from server has lost.........tabletclient.isConnected()----->"+tabletclient.isConnected());
}
} catch (UnknownHostException e) { System.out.println("Entered 2.........");
} catch (IOException e) { System.out.println("Entered 3.........");e.printStackTrace();
}
}
在服务器端
:
:
private Set <Socket> TABhs=new HashSet<Socket>();
:
:
new Thread(new TABServerThread()).start(); // runs in background
:
:
:
class ServerThread implements Runnable {
private ServerSocket server;
@Override
public void run() {
try {
server = new ServerSocket(SERVER_PORT);
System.out.println("Server Start the server at port " + SERVER_PORT
+ " and waiting for clients...");
while (true) {
Socket socket = server.accept();
System.out.println("Server Accept socket connection: "
+ socket.getLocalAddress());
new Thread(new ClientHandler(socket)).start();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private static PrintWriter out;
class ClientHandler implements Runnable {
private Socket clientSocket;
private Scanner in;
public ClientHandler(Socket clietSocket) {
this.clientSocket = clietSocket;
}
@Override
public void run() {
try {
out = new PrintWriter(clientSocket.getOutputStream());
in = new Scanner(clientSocket.getInputStream());
String line;
System.out.println("ClientHandlerThread Start communication with : "+ clientSocket.getLocalAddress());
try{
while((line = in.nextLine()) != null) {
System.out.println("ClientHandlerThread Client says: " + line);
String dat[]=line.split("#");
String query="insert into table_orders (tableno,kotno, orders,status) values('"+dat[1]+"','"+dat[0]+"','"+dat[2]+"','pending')";
try {
int i= dbGetDet.insertDetails(query);
if(i>0)
{
fillTable();
filtercomboBox();
out.print("success");
out.flush();
for(Socket so:TABhs)
{
PrintWriter ot = new PrintWriter(so.getOutputStream());
ot.println("tableallocation#"+dat[1]);
ot.flush();
}
System.out.println("SENDED 'SUCCESS' TO CLIENT");
}
} catch (Exception ex) {
Logger.getLogger(MYClientclass.class.getName()).log(Level.SEVERE, null, ex);
}
// }
}
}catch(Exception r){}
} catch (IOException e) {
e.printStackTrace();
}
}
}
在服务器的按钮单击
String stat=status_combo.getSelectedItem().toString();
String tables=tableno_combo.getSelectedItem().toString();
String kotno=kotno_combo.getSelectedItem().toString();
if(stat.equals("Processing"))
{
try {
TABhs = new CopyOnWriteArraySet(TABhs);
int soint=1;
System.out.println("TABhs Processing--------------------->"+TABhs.size());
for(Iterator <Socket> it=TABhs.iterator();it.hasNext();)
{
Socket so=it.next();
System.out.println("SEEE SOCKET Processing"+soint+"----->"+so.isClosed());
PrintWriter ot = new PrintWriter(so.getOutputStream());
ot.println("tableupdate#"+tables+"#"+kotno+"#processing");
ot.flush();
JOptionPane.showMessageDialog(rootPane, "<html><body>Table Kot Status Changed to <b>Processing</b></body></html>");
soint++;
}
System.out.println("TABhs Processing--------------------->"+TABhs.size());
}
catch (Exception ex) {
Logger.getLogger(MYClientclass.class.getName()).log(Level.SEVERE, null, ex);
}
}
现在每次单击按钮时,输出如下所示
第一次点击
SEEE SOCKET Ready 1----->false
Server Accept socket connection: /192.168.1.74
SEEE SOCKET Ready 2----->false
TABhs--------------------->2
第二次点击
SEEE SOCKET Ready 1----->false
SEEE SOCKET Ready 2----->false
Server Accept socket connection: /192.168.1.74
SEEE SOCKET Ready 3----->false
TABhs--------------------->4
第四次点击
SEEE SOCKET Ready 1----->false
SEEE SOCKET Ready 2----->false
SEEE SOCKET Ready 3----->false
Server Accept socket connection: /192.168.1.74
SEEE SOCKET Ready 4----->false
TABhs--------------------->5