Io 異常: The Network Adapter could not establish the connection

　　新接觸一個項目，導入源碼，在本地啟動的時候后台報了一個錯誤：

Could not discover the dialect to use. java.sql.SQLException: Io 異常: The Network Adapter could not establish the connection
    at java.sql.SQLException: Io 異常: The Network Adapter could not establish the connection
    at     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
    at     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
    at     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:255)
    at     at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387)
    at     at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:439)
    at     at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165)
    at     at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)
    at     at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801)
    at     at java.sql.DriverManager.getConnection(DriverManager.java:582)
    at     at java.sql.DriverManager.getConnection(DriverManager.java:185)
    at     at ch.qos.logback.core.db.DriverManagerConnectionSource.getConnection(DriverManagerConnectionSource.java:54)
    at     at ch.qos.logback.core.db.ConnectionSourceBase.discoverConnnectionProperties(ConnectionSourceBase.java:47)
    at     at ch.qos.logback.core.db.DriverManagerConnectionSource.start(DriverManagerConnectionSource.java:38)
    at     at ch.qos.logback.core.joran.action.NestedComplexPropertyIA.end(NestedComplexPropertyIA.java:168)
    at     at ch.qos.logback.core.joran.spi.Interpreter.callEndAction(Interpreter.java:315)
    at     at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:194)
    at     at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:180)
    at     at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:52)
    at     at ch.qos.logback.core.joran.spi.Interpreter.play(Interpreter.java:332)
    at     at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:126)
    at     at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:93)
    at     at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:52)
    at     at ch.qos.logback.classic.util.ContextInitializer.configureByResource(ContextInitializer.java:60)
    at     at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:121)
    at     at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:85)
    at     at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:55)
    at     at org.slf4j.LoggerFactory.bind(LoggerFactory.java:121)
    at     at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:111)
    at     at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:268)
    at     at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:241)
    at     at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:156)
    at     at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:132)
    at     at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:272)
    at     at org.mule.context.DefaultMuleContextFactory.<clinit>(DefaultMuleContextFactory.java:36)

　　首先想到的是是不是數據配置有問題，找到配置數據庫的文件，先檢查服務器IP是否正確，ping一下服務器IP地址，看是否正確，在dos頁面輸入如下指令：

ping 服務器IP

　　得到的結果如下：

　　　　

　　請求超時，意識到這可能是生產環境的數據，在本地啟動沒有操作權限，需要更改為測試環境的數據庫啟動。

 

　　如若沒有找到問題所在，后續的分析方法：

　　　　1.判斷端口號是否正確，在一般不會有錯誤，但可能使用多個oracle版本，導致端口號不為1521的情況。

　　　　　進行一下操作：在DOS上鍵入sqlplus，檢查oracle是否開啟，若一切正常，問題仍沒有解決，進行下一步。

　　　　2.檢查目標機器是否裝有防火牆，可能是服務器端口號屏蔽而造成的，關閉防火牆后，嘗試重新連接。仍未解決，進行下一步。

　　　　3.檢查數據庫監聽是否啟動：下面以現在主流的數據庫ORACLE為例：

　　　　　重新手動啟動數據庫監聽： 開始 → 運行→ 輸入CMD→ 進入DOS命令提示界面 d:>lsnrctl LSNRCTL> status 或者  LSNRCTL> start 

　　　　注：可能服務器上有多個監聽，默認lsnrctl start啟動的是 LISTENER這個監聽， 查看其他監聽可以搜索listener.ora這個文件。

　　　　　看看是否有其他的監聽，如果有，使用lsnrctl start 監聽名字。

# listener.ora Network Configuration File: D:\app\Administrator\product\11.2.0\dbhome_1\network\admin\listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME=RS)
      (SID_NAME = RS)
      (ORACLE_HOME = D:\app\Administrator\product\11.2.0\dbhome_1)
      (ENVS = "EXTPROC_DLLS=ONLY:D:\app\Administrator\product\11.2.0\dbhome_1\bin\oraclr11.dll")
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.12)(PORT = 1521))
    )
  )

ADR_BASE_LISTENER = D:\app\Administrator