Question

java.sql.SQLException: Io 异常: The Network Adapter could not establish the connection at oracle.jdb

java.sql.SQLException: Io 异常: The Network Adapter could not establish the connection
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:255) at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387) at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:414) at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165) at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35) at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801) at java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at com.dms.jdbc.workspace.JDBCForOra.getConnection(JDBCForOra.java:79) at com.dms.util.Login.regLogin1(Login.java:456) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.directwebremoting.impl.DefaultRemoter$1.doFilter(DefaultRemoter.java:740) at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:744) at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:593) at org.directwebremoting.dwrp.BaseCallHandler.handle(BaseCallHandler.java:90) at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:120) at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:141) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:864) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579) at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1665) at java.lang.Thread.run(Unknown Source) 求助问题所在

Answer 1

2.数据库没有启动；
看一下数据库服务有没有启动

1.网络不通，先试下PL/SQL直联数据库；
边一下数据，看一下你的帐号什么的是否正确

4.你的项目的连接参数是不是都有配置对
检查你的配置参数。最好能DEBUG到那一行，看一下是不是对的
3.JDBC有问题，换个包试试。

Answer 2

1.网络不通，先试下PL/SQL直联数据库；
2.数据库没有启动；
3.JDBC有问题，换个包试试。

Answer 3

网络有问题，没有连接到数据库，一般是连服务器上的数据库会有这样的问题，有可能是硬件防火墙的问题，检查一下网络

Answer 4

没连到数据库，远程的话可能网络有问题，本地的话可能数据库【服务】没启动。

Answer 5

jdbc连接数据库的url中的数据库名是否正确？