谁能帮帮我，java.sql.SQLException: Io 异常:

[zzyfoot]

java.sql.SQLException: Io 异常: The Network Adapter could not establish the connection at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:169) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:211) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:324) at oracle.jdbc.driver.OracleConnection.(OracleConnection.java:266) at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:365) at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:260) at java.sql.DriverManager.getConnection(DriverManager.java:517) at java.sql.DriverManager.getConnection(DriverManager.java:177) at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:111) at oracle.jdbc.pool.OracleConnectionPoolDataSource.getPhysicalConnection(OracleConnectionPoolDataSource.java:98) at oracle.jdbc.pool.OracleConnectionPoolDataSource.getPooledConnection(OracleConnectionPoolDataSource.java:77) at oracle.jdbc.pool.OracleConnectionPoolDataSource.getPooledConnection(OracleConnectionPoolDataSource.java:61) at oracle.jdbc.pool.OracleConnectionCacheImpl.getNewPoolConnection(OracleConnectionCacheImpl.java:274) at oracle.jdbc.pool.OracleConnectionCacheImpl.getConnection(OracleConnectionCacheImpl.java:220) at oracle.jdbc.pool.OracleConnectionCacheImpl.getConnection(OracleConnectionCacheImpl.java:163) at regie.UDB.openconnect(UDB.java:182) at regie.DBConnection.(DBConnection.java:26) at regie.User.(User.java:23) at org.apache.jsp.login$jsp._jspService(login$jsp.java:128) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:202) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:382) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:474) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:201) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2344) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566) at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:462) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:163) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1011) at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1106) at java.lang.Thread.run(Thread.java:484)

[wjmmml]

这是无法连接上你的网络数据库。

[zzyfoot]

大哥，
<jsp:useBean id='udb' scope='application' class='regie.UDB' type="regie.UDB" />


public User(UDB m_udb) throws SQLException{
super(m_udb);
}
出错，咋办

[littlecong]

regie.UDB是啥？
你的数据库起来了吗
用其他工具连的上吗

[zzyfoot]

UDB建立一个数据库联接的类，
数据库没问题，别的程序都可以