Io 异常: The Network Adapter could not establish the connection

异常如下：

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:1225)
  at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
 Caused by: java.sql.SQLException: Io 异常: The Network Adapter could not establish the connection
  at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:180)
  at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:222)
  at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:335)
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主要原因：

1.可能是server.xml文件的DataSource配置出错。

(1).如果用到的是本机上的数据，本地数据源里的部分配置为： username="pcisv62" password="11" url="jdbc:oracle:thin:@localhost:1521:orcl"
(2).如果用到的是服务器上的数据，则数据源里的部分配置为： username="pcisv62" password="11" url="jdbc:oracle:thin:@dbserver:1521:corev6"51Testing软件测试网 Fro^S ~p i2eU

（dbserver为服务器的名字，corev6为服务器上Oracle的SID）51Testing软件测试网,j?.Rn z)m;{9M

2.可能是oracle的tnsnames.ora文件配置出错。51Testing软件测试网;R*Xc8c!b d

oracle的安装目录E:\oracle\ora92\network\admin下的tnsnames.ora：
本地配置：
ORCL =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 主机名)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = ORCL)
    )
  )
或服务器配置：
COREV6_DBSERVER =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = dbserver)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SID = COREV6)
      (SERVER = DEDICATED)
    )
  )