oracle连接是的一个错误，帮忙看看
错误信息：Io 异常: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=153092352)(ERR=12505)(ERROR_STACK=(ERROR=(CODE=12505)(EMFI=4))))
代码：
public class ConnOracle {

  static private String strDriver = "oracle.jdbc.driver.OracleDriver";
  static private String strUrl = "jdbc:oracle:thin:@192.168.2.200:1521:GIS_HN_Layered"; 
  static private String strUser = "GIS_HN_Layered";
  static private String strPwd = "GIS_HN_Layered";

  private Connection conn = null;
  private Statement stmt = null;
  private ResultSet rs = null;

  static {
  try {
  Class.forName(strDriver);
  } catch (ClassNotFoundException ex) {
  System.out.println("Error load " + strDriver);
  }
  }

  public ConnOracle() {
  }

  public ResultSet executeQuery(String sql) {
  try {
  rs = getStatement().executeQuery(sql);
  } catch (SQLException ex) {
  System.err.println("query error:" + ex.getMessage());
  }
  return rs;
  }

  public boolean executeBatch(java.util.ArrayList sqls) {
  boolean bRet = false;
  try {
  conn = getConnection();
  conn.setAutoCommit(false);
  stmt = conn.createStatement();
  for (int i = 0; i < sqls.size(); i++) {  
  String sql = (String) sqls.get(i);
  stmt.addBatch(sql);
  }
  stmt.executeBatch();
  conn.commit();
  bRet = true;
  } catch (Exception ex) {
  try {
  conn.rollback();
  } catch (Exception ex2) {
  System.err.println("rollback failed:" + ex2.getMessage());
  }
  ex.printStackTrace();
  } finally {
 
  }
  return bRet;
  }

  public void close() {
  try {
  if (rs != null) {
  rs.close();
  rs = null;
  }
  if (stmt != null) {
  stmt.close();
  stmt = null;
  }
  if (conn != null) {
  conn.close();
  conn = null;
  }
  } catch (Exception ex) {
  System.err.println("close error:" + ex.getMessage());
  }
  }

  public Connection getConnection() {
  try {
  if (conn == null || conn.isClosed())
  conn = DriverManager.getConnection(strUrl, strUser, strPwd);
  } catch (Exception ex) {
  ex.printStackTrace();
  return null;
  }
  return conn;
  }

  private Statement getStatement() {
  try {
  if (stmt == null)
  stmt = getConnection().createStatement();
  } catch (Exception ex) {
  ex.printStackTrace();
  return null;
  }
  return stmt;
  }
   
  public sta