怎么在catch到SocketException时把socket给close?

Question

receiveSocket=null;
或者
finally{
   receiveSocket=null;
}

Answer 1

我试过，这样不行，编译时产生variable receiveSocket错误？
这是为什么啊？

Answer 2

finally{
 try{
       if (socket != null )
           socket.close();
       socket = null ;
 }catch(Exception e){}
}或者把try代码放到你的exception里面也可

Answer 3

没有用啊，只要receiveSocket不和DatagramSocket receiveSocket = new DatagramSocket(7878)写在同一个try里面，就会产生variable receiveSocket的错误？

Answer 4

DatagramSocket receiveSocket = null;
DatagramPacket packetIn = null;
try {
    receiveSocket = new DatagramSocket(7878);
    receiveSocket.setSoTimeout(7000);
    packetIn = new DatagramPacket(byteIo,508);
    receiveSocket.receive(packetIn);
} catch(SocketTimeoutException ex) {
    System.out.println(ex);
    receiveSocket.close();
} catch(SocketException ex) {
    System.out.println(ex);
} catch(IOException ex) {
    System.out.println(ex);
}