一下午的错误结果 求改正

java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at blw.app.socket.main(socket.java:18)
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
Socket socket=new Socket("192.168.7.9",12345);
InputStream input=new FileInputStream("E:/my.txt") ;
OutputStream out= socket.getOutputStream();
byte b[]=new byte[1024];
int temp=0;
while((temp=input.read(b))!=-1){
out.write( b,0,temp);
}
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}