Connection refused exception solution for socket

Practice socket programming today, in the new socket accidentally encountered the following anomalies, and the good one, the original is not open the corresponding server, write down to prepare for reference, by the way for the vast number of netizens to mention a wake up, don't go a detour ...

Log Code

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.conn ECT (Unknown source) at
Java.net.Socket.connect (Unknown source) in
java.net.Socket.connect (Unknown so Urce) at
java.net.socket.<init> (Unknown source) at
java.net.socket.<init> (Unknown source )