问题描述

我编写了一个 servlet 程序，我希望它连接到我的 Oracle 数据库，但它给了我一个错误.我正在使用 Eclipse Helios、Tomcat 6.0.37、Oracle 11g (11.2.0.1.0)、ojdbc6.jar(在服​​务器项目的运行配置中添加).我能够通过 SQL Plus 接口连接到数据库，甚至可以从 Eclipse 的数据库开发角度启动连接.但是当我尝试通过我的 servlet 进行连接时，我收到了错误消息.对于我的 servlet，我使用的是端口号 9090，而对于数据库，我使用的是默认的 1521.

I wrote a servlet program and I want it to connect to my Oracle database but its giving me an error. I am using Eclipse Helios, Tomcat 6.0.37, Oracle 11g (11.2.0.1.0), ojdbc6.jar(added in run configuration of the Server project). I am able to connect to the database through the SQL Plus interface and even can start a connection from Eclipse's database development perspective. But when i am trying to connect through my servlet I am getting the error. For my servlet i am using the port number 9090 and for the database the default 1521.

java.sql.SQLException: The Network Adapter could not establish the connection
    at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:412)
    at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:531)
    at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:221)
    at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
    at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:503)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at com.android.collegenotificationsystem.RegistrationServlet.doGet(RegistrationServlet.java:43)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
    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:103)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    at java.lang.Thread.run(Unknown Source)
Caused by: oracle.net.ns.NetException: The Network Adapter could not establish the connection
    at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:359)
    at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:422)
    at oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:672)
    at oracle.net.ns.NSProtocol.connect(NSProtocol.java:237)
    at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1042)
    at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:301)
    ... 21 more
Caused by: java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at oracle.net.nt.TcpNTAdapter.connect(TcpNTAdapter.java:141)
    at oracle.net.nt.ConnOption.connect(ConnOption.java:123)
    at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:337)
    ... 26 more

这是我建立连接的代码:

This is my code for establishing the connection:

Class.forName("oracle.jdbc.OracleDriver");Connection con = (Connection) DriverManager.getConnection( "jdbc:oracle:thin:@localhost:1521:orcl","username","password");

我尝试执行 lsnrctl stat 命令，结果如下:

I tried executing the lsnrctl stat command and this was the result:

LSNRCTL for 32-bit Windows: Version 11.2.0.1.0 - Production on 03-AUG-2013 16:08
:46

Copyright (c) 1991, 2010, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for 32-bit Windows: Version 11.2.0.1.0 - Produ
ction
Start Date                03-AUG-2013 12:14:19
Uptime                    0 days 3 hr. 54 min. 28 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   C:appOwnerproduct11.2.0dbhome_1
etworkadminlis
tener.ora
Listener Log File         c:appownerdiag	nslsnrOwner-PClisteneralertlog.
xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\.pipeEXTPROC1521ipc)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
  Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "orcl.168.1.56" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB.168.1.56" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully

这些是我的 tnsnames.ora 文件的内容:

These are the contents of my tnsnames.ora file:

LISTENER_ORCL =
  (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))


ORACLR_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
    (CONNECT_DATA =
      (SID = CLRExtProc)
      (PRESENTATION = RO)
    )
  )

ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl.168.1.56)
    )
  )

任何帮助将不胜感激.提前致谢.

Any help would be appreciated. Thanks in advance.

推荐答案

我遇到了类似的问题.它通过一个简单的命令为我解决.

I had the similar issue. its resolved for me with a simple command.

lsnrctl start

网络适配器异常的原因是:

The Network Adapter exception is caused because:

1. 数据库主机名或端口号错误 (OR)
2. 数据库 TNSListener 尚未启动.可以使用 lsnrctl 实用程序启动 TNSListener.

1. The database host name or port number is wrong (OR)
2. The database TNSListener has not been started. The TNSListener may be started with the lsnrctl utility.

尝试使用命令提示符启动侦听器:

Try to start the listener using the command prompt:

1. 单击开始，在搜索字段中键入 cmd，当 cmd 出现在选项列表中时，右键单击它并选择以管理员身份运行".
2. 在命令提示符窗口中，键入不带引号的 lsnrctl start 并按 Enter.
3. 输入 Exit 并按 Enter.

1. Click Start, type cmd in the search field, and when cmd shows up in the list of options, right click it and select ‘Run as Administrator’.
2. At the Command Prompt window, type lsnrctl start without the quotes and press Enter.
3. Type Exit and press Enter.

希望有帮助.

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