Public static void main (String[] args)  throws throwable{/*1, before running the program, To the CMD console to see if Netstat has a database connection c:\>netstat -np tcp | grep 1521*/ Oracle.jdbc.driver.OracleDriver.class.newInstance (); Connection con = drivermanager.getconnection (              "JDBC:ORACLE:THIN:@192.168.10.10:1521:ORCL",              "H2do",             " H2do "); System.in.read ();/*2, io blocking, to cmd console view netstatc:\>netstat -np tcp | grep 1521tcp     192.168.10.192:63198   192.168.10.10:1521      Established*/con.close ();/*3, program enter close database connection, to cmd console view Netstatc:\>netstat -np tcp | grep  1521TCP    192.168.10.192:63198   192.168.10.10:1521      time_wait when the  socket connection is closed, the active shut-off end enters the time_wait state, and the passive shutdown enters the closed state. */} 
JDBC View network status