java.sql.SQLException: Io 异常

java.sql.SQLException: Io 异常: The Network Adapter could not establish the connection
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:333)
        at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:404)
        at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:468)
        at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:314)
        at java.sql.DriverManager.getConnection(DriverManager.java:620)
        at java.sql.DriverManager.getConnection(DriverManager.java:200)
        at com.CSY.DB.DBPool.getConnectionLocal(DBPool.java:44)
        at com.CSY.XMLTools.Tools.SendSMS(Tools.java:269)
        at com.CSY.youli.datainte.server.NIOServer.process(NIOServer.java:168)
        at com.CSY.youli.datainte.server.NIOServer.run(NIOServer.java:76)这是日志 麻烦各位老大看看是什么问题 怎么解决
感觉上是没有联接上数据库