连接sqlserver 出现 The Network Adapter could not establish the connection

连接sqlserver 出现 The Network Adapter could not establish the connection ，请求帮助
我在Tomcat中部署里一个系统，数据库连的是sqlserver，可是当我启动Tomcat的时候总是以下错误：
Exception in thread "Timer-0" org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create Po 
olableConnectionFactory (Io 异常: The Network Adapter could not establish the connection) 
Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Io 异常: The Network Adapter could not establish the connection) 
        at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:855) 
        at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540) 
        at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:112) 
        at org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy.getConnection(TransactionAwareDataSourceProxy.java:108) 
        at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:112) 
        at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77) 
        at org.springframework.orm.ibatis.SqlMapClientTemplate.execute(SqlMapClientTemplate.java:182) 
        at org.springframework.orm.ibatis.SqlMapClientTemplate.executeWithListResult(SqlMapClientTemplate.java:219) 
        at org.springframework.orm.ibatis.SqlMapClientTemplate.queryForList(SqlMapClientTemplate.java:266) 
        at com.safetys.sqldao.ZhuaQuDao.viewZhuaQuList(ZhuaQuDao.java:40) 
        at com.safetys.service.AutoCatchTask.run(AutoCatchTask.java:33) 
        at java.util.TimerThread.mainLoop(Unknown Source) 
        at java.util.TimerThread.run(Unknown Source) 
Caused by: java.sql.SQLException: Io 异常: The Network Adapter could not establish the connection 
        at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:133) 
        at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:115) 
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:221) 
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:293) 
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:646) 
        at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:454) 
        at oracle.jdbc.driver.PhysicalConnection. <init>(PhysicalConnection.java:493) 
        at oracle.jdbc.driver.T4CConnection. <init>(T4CConnection.java:198)