在Tomcat上配置Proxool的DataSource(Jndi) --第2种方法

第一个方法是在容器,也就是Tomcat上做配置,但是,有时候会不适用,比如虚拟主机,它可能不允许你在机器上做配置,那样,就只能从自身的程序着手.

首先,写一个Proxool的配置文件.....放在 WEB-INF 目录下,下面是一个例子



<?
xml version="1.0" encoding="UTF-8"
?>



<!--



the proxool configuration can be embedded within your own application's. Anything outside the "proxool" tag is



ignored.



-->



<
something-else-entirely
>



<
proxool
>



<
alias
>
proxool_alias
</
alias
>



<
driver-url
>
jdbc:oracle:thin:@127.0.0.1:1521:sid
</
driver-url
>



<
driver-class
>
oracle.jdbc.driver.OracleDriver
</
driver-class
>



<
driver-properties
>



<
property
name
="user"
value
="user"

/>



<
property
name
="password"
value
="pwd"

/>



</
driver-properties
>



<
maximum-connection-count
>
10
</
maximum-connection-count
>



<
minimum-connection-count
>
5
</
minimum-connection-count
>



<
maximum-connection-lifetime
>
30
</
maximum-connection-lifetime
>



<
maximum-active-time
>
3
</
maximum-active-time
>



<
simultaneous-build-throttle
>
5
</
simultaneous-build-throttle
>



<
house-keeping-sleep-time
>
30000
</
house-keeping-sleep-time
>



<
house-keeping-test-sql
>
Select Sysdate Form dual
</
house-keeping-test-sql
>



<
prototype-count
>
0
</
prototype-count
>



</
proxool
>



</
something-else-entirely
>

然后,当然是先把这个文件先用上,看看可不可以用

在web.xml里面配置上



<
servlet
>



<
servlet-name
>
ServletConfigurator
</
servlet-name
>



<
servlet-class
>
org.logicalcobwebs.proxool.configuration.ServletConfigurator
</
servlet-class
>



<
init-param
>



<
param-name
>
xmlFile
</
param-name
>



<
param-value
>
WEB-INF/proxool.xml
</
param-value
>



</
init-param
>



<
load-on-startup
>1
</
load-on-startup
>



</
servlet
>



<
servlet
>



<
servlet-name
>
proxooladmin
</
servlet-name
>



<
servlet-class
>
org.logicalcobwebs.proxool.admin.servlet.AdminServlet
</
servlet-class
>



</
servlet
>



<
servlet-mapping
>



<
servlet-name
>
proxooladmin
</
servlet-name
>



<
url-pattern
>
/proxooladmin.servlet
</
url-pattern
>



</
servlet-mapping
>

这样在应用启动之后,就能通过以下代码来访问到数据库



Connection conn
=
DriverManager.getConnection(
"
proxool.proxool_alias

"
);



Statement stmt
=
conn.createStatement();



ResultSet rs
=
stmt.executeQuery(
"
Select * From test
"
);

/*以下是重点*/

但是我们需要的是注册一个JNDI,

有2种方法

1.配置文档里面直接注册,这样配置:



<?
xml version="1.0" encoding="UTF-8"
?>



<!--



the proxool configuration can be embedded within your own application's. Anything outside the "proxool" tag is



ignored.



-->



<
something-else-entirely
>



<
proxool
>



<
alias
>
proxool_alias
</
alias
>



<
driver-url
>
jdbc:oracle:thin:@127.0.0.1:1521:pub
</
driver-url
>



<
driver-class
>
oracle.jdbc.driver.OracleDriver
</
driver-class
>



<
driver-properties
>



<
property
name
="user"
value
="user"

/>



<
property
name
="password"
value
="pwd"

/>



</
driver-properties
>



<
jndi-name
>
jdbc-0
</
jndi-name
>



<
jndi-java
.naming.factory.initial
>
org.apache.naming.java.javaURLContextFactory
</
jndi-java.naming.factory.initial
>



<
jndi-java
.naming.factory.url.pkgs
>
org.apache.naming
</
jndi-java.naming.factory.url.pkgs
>



<
maximum-connection-count
>
10
</
maximum-connection-count
>



<
minimum-connection-count
>
5
</
minimum-connection-count
>



<
maximum-connection-lifetime
>
30
</
maximum-connection-lifetime
>



<
maximum-active-time
>
3
</
maximum-active-time
>



<
simultaneous-build-throttle
>
5
</
simultaneous-build-throttle
>



<
house-keeping-sleep-time
>
30000
</
house-keeping-sleep-time
>



<
house-keeping-test-sql
>
Select Sysdate Form dual
</
house-keeping-test-sql
>



<
prototype-count
>
0
</
prototype-count
>



</
proxool
>



</
something-else-entirely
>

2.在自己的Java类里面注册JNDI

那就需要用到Proxool提供的另一个类:ProxoolJNDIHelper:



Properties info
=

new
Properties();



info.setProperty(
"
jndi-name
"
,
"
jdbc-0
"
);



info.setProperty(
"
java.naming.factory.initial
"
, org.apache.naming.java.javaURLContextFactory.
class
.getName());



info.setProperty(
"
java.naming.factory.url.pkgs
"
,
"
org.apache.naming
"
);



//
info.setProperty("java.naming.provider.url", "localhost:8888");





try

{



ProxoolJNDIHelper.registerDatasource(
"
proxool_alias
"
, info);





}

catch
(ProxoolException e)
{



//
TODO Auto-generated catch block



e.printStackTrace();



}

上面所说的2中方法都能注册一个名为jdbc-0的JNDI,

可以通过以下代码来访问数据库..



Context ctx
=

new
InitialContext();



DataSource dataSource
=
(DataSource) ctx.lookup(
"
jdbc-0
"
);





Connection conn
=
dataSource.getConnection();

下面说明代码,

1.jndi-name好像不能用jdbc/xx这种名字,文档里面用的就是/datasources/UserDB,但是Tomcat启动就报错,可能和特殊字符有关,具体没测试

2.JNDI的几个参数(java.naming.factory.initial
,java.naming.factory.url.pkgs,还有java.naming.provider.url),这些参数和容器有关,Tomcat就是这些参数

JBOSS的话就是:

java.naming.factory.initial=
org.jnp.interfaces.NamingContextFactory

java.naming.provider.url
=
localhost:1099

java.naming.factory.url.pkgs
=
org.jboss.naming