JavaJNDI
一直都JNDI这个名字，可是一直都没有去研究过，因为工作中一直都没用到。。。
这次面试的时候用到了。。。 于是乎，找来例子练练手。。
<
Context
path
="/connjndi"
docBase
="D:\workspace\TestJndi\WebRoot"
reloadable
="true"
>
<
Resource
name
="jdbc/SampleData"
auth
="Container"
type
="javax.sql.DataSource"
maxActive
="100"
maxIdle
="30"
maxWait
="10000"
username
="sampledata"
password
="password"
driverClassName
="oracle.jdbc.OracleDriver"
url
="jdbc:oracle:thin:@//localhost:1521/mondrian"
/>
</
Context
>
Tomcat标准数据源资源工厂配置项如下：
* driverClassName - 所使用的JDBC驱动类全称。
* maxActive - 同一时刻可以自数据库连接池中被分配的最大活动实例数。
* maxIdle - 同一时刻数据库连接池中处于非活动状态的最大连接数。
* maxWait - 当连接池中没有可用连接时，连接池在抛出异常前将等待的最大时间，单位毫秒。
*password - 传给JDBC驱动的数据库密码。
* url - 传给JDBC驱动的连接URL。
* user - 传给JDBC驱动的数据库用户名。
* validationQuery - 一个SQL查询语句，用于在连接被返回给应用前的连接池验证。
* 如果指定了该属性，则必为至少返回一行记录的SQL SELECT语句。
在web.xml中添加：
<
description
>
Oracle Test App
</
description
>
<
resource-ref
>
<
description
>
DB Connection
</
description
>
<
res-ref-name
>
jdbc/SampleData
</
res-ref-name
>
<
res-type
>
javax.sql.DataSource
</
res-type
>
<
res-auth
>
Container
</
res-auth
>
</
resource-ref
>
写一个简单的jsp测试了一下：
1
<%
@ page
import
=
"
java.sql.*,javax.sql.*,javax.naming.*
"
%>
2
3
<%
4 Connection conn
=
null
;
5
try
6
{
7
Context ctx = new InitialContext();
8 DataSource ds = (DataSource)ctx.lookup( " java:comp/env/jdbc/SampleData " );
9 conn = ds.getConnection();
10 System.out.println( " connection pool connected !! " );
11 }
catch
(NamingException e)
{
12 System.out.println(e.getMessage());
13 }
catch
(SQLException e)
{
14 System.out.println(e.getMessage());
15 e.printStackTrace();
16
}
finally
17
{
18 conn.close();
19 }
20
%>
<%
@ page
import
=
"
java.sql.*,javax.sql.*,javax.naming.*
"
%>
2
3
<%
4
Connection conn
=
null
;5
try
6
{
7
Context ctx = new InitialContext(); 8
DataSource ds = (DataSource)ctx.lookup( " java:comp/env/jdbc/SampleData " );9
conn = ds.getConnection();10
System.out.println( " connection pool connected !! " ); 11
}
catch
(NamingException e)
{12
System.out.println(e.getMessage());13
}
catch
(SQLException e)
{14
System.out.println(e.getMessage());15
e.printStackTrace();16
}
finally
17
{18
conn.close();19
}
20
%>
我就是这样连接成功了。
写的时候还是看了下々上善若水々 的博客，总感觉他的写得比较全，而我总感觉写不出比他好的，又不能写出和他不同的地方。。就这样子啦。。
PS：在查资料的时候，看到在CSDN中有位朋友谈到了JNDI的用处：
JNDI不止用于数据源，其可以用于存储和获得任何类型的已命名的java对象等等.
如果使用JDBC有thin和oci两种连接方式:
[先说thin]
打开数据库连接方式:DriverManager.getConnection
1
DriverManager.registerDriver(
new
oracle.jdbc.OracleDriver());
2
3 Connection myConnection
=
DriverManager.getConnection(
4
"
jdbc:oracle:thin:@test2000:1521:orac
"
,
//
orac为oracle的SID
5
"
user
"
,
6
"
password
"
7 );
DriverManager.registerDriver(
new
oracle.jdbc.OracleDriver()); 2
3
Connection myConnection
=
DriverManager.getConnection( 4
"
jdbc:oracle:thin:@test2000:1521:orac
"
,
//
orac为oracle的SID
5
"
user
"
, 6
"
password
"
7
);
或者用前面给出的那个
OracleDataSource myODS = new OracleDataSource(); //其属性简单明了,不难掌握
Connection myConnection = myODSgetConnection("user","password");
[再说OCI](可以使连接池中有多个缓冲的连接)
1
OracleOCIConnectionPool myOOCP
=
new
OracleOCIConnectionPool();
2
3
//
set the attributes for the physical database connections
4
myOOCP.setServerName(
"
test2000
"
);
5 myOOCP.setDatabaseName(
"
ORCL
"
);
6 myOOCP.setDriverType(
"
oci
"
);
7 myOOCP.setPortNumber(
1521
);
8 myOOCP.setUser(
"
store_user
"
);
9 myOOCP.setPassword(
"
store_password
"
);
10
11
//
set the values for the dynamic attributes of myOOCP
12
Properties myProperties
=
new
Properties();
13 myProperties.put(OracleOCIConnectionPool.CONNPOOL_MIN_LIMIT,
"
5
"
);
14 myProperties.put(OracleOCIConnectionPool.CONNPOOL_MAX_LIMIT,
"
10
"
);
15 myProperties.put(OracleOCIConnectionPool.CONNPOOL_INCREMENT,
"
2
"
);
16 myProperties.put(OracleOCIConnectionPool.CONNPOOL_TIMEOUT,
"
30
"
);
17 myProperties.put(OracleOCIConnectionPool.CONNPOOL_NOWAIT,
"
true
"
);
18 myOOCP.setPoolConfig(myProperties);
19
20
//
request a connection instance from myOOCP and store
21
//
the connection instance in myConnection
22
OracleOCIConnection myConnection
=
(OracleOCIConnection) myOOCP.getConnection();
23
OracleOCIConnectionPool myOOCP
=
new
OracleOCIConnectionPool(); 2
3
//
set the attributes for the physical database connections
4
myOOCP.setServerName(
"
test2000
"
); 5
myOOCP.setDatabaseName(
"
ORCL
"
); 6
myOOCP.setDriverType(
"
oci
"
); 7
myOOCP.setPortNumber(
1521
); 8
myOOCP.setUser(
"
store_user
"
); 9
myOOCP.setPassword(
"
store_password
"
); 10
11
//
set the values for the dynamic attributes of myOOCP
12
Properties myProperties
=
new
Properties(); 13
myProperties.put(OracleOCIConnectionPool.CONNPOOL_MIN_LIMIT,
"
5
"
); 14
myProperties.put(OracleOCIConnectionPool.CONNPOOL_MAX_LIMIT,
"
10
"
); 15
myProperties.put(OracleOCIConnectionPool.CONNPOOL_INCREMENT,
"
2
"
); 16
myProperties.put(OracleOCIConnectionPool.CONNPOOL_TIMEOUT,
"
30
"
); 17
myProperties.put(OracleOCIConnectionPool.CONNPOOL_NOWAIT,
"
true
"
); 18
myOOCP.setPoolConfig(myProperties); 19
20
//
request a connection instance from myOOCP and store 21
//
the connection instance in myConnection
22
OracleOCIConnection myConnection
=
(OracleOCIConnection) myOOCP.getConnection(); 23
这个就当是个引子，之后对JNDI有个深入的了解和认识。。。。