在TOMCAT5.0.27 中利用数据链接缓冲池

一、把相应的JDBC包放置到TOMCAT安装目录的COMMON/LIB目录中
二、TOMCAT的配置文件的内容（以ORACLE， THIN连接为例）
<?xml version='1.0' encoding='utf-8'?>
<Context docBase="E:/Workspace/toshiba" path="/toshiba" reloadable="true" workDir="E:\Workspace\toshiba\work">
<Resource name="jdbc/OracleDB" auth="Container" type="javax.sql.DataSource"/>

<ResourceParams name="jdbc/OracleDB">

<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>

<parameter>
<name>driverClassName</name>
<value>oracle.jdbc.driver.OracleDriver</value>
</parameter>

<parameter>
<name>url</name>
<value>jdbc:oracle:thin:@UFJ:1521:DRCH1001</value>
</parameter>

<parameter>
<name>username</name>
<value>scott</value>
</parameter>

<parameter>
<name>password</name>
<value>tiger</value>
</parameter>

<parameter>
<name>maxActive</name>
<value>20</value>
</parameter>

<parameter>
<name>maxIdle</name>
<value>10</value>
</parameter>

<parameter>
<name>maxWait</name>
<value>-1</value>
</parameter>

</ResourceParams>
</Context>

三、WEB。XML文件的内容
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<resource-ref>
<description>Oracle Datasource example</description>
<res-ref-name>jdbc/OracleDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</web-app>

四、JAVA代码的书写

package com.csk.dm;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;

public class ServiceLocator {
private InitialContext ic = null;
private Map cache;

private static ServiceLocator me = null;

static {
try {
me = new ServiceLocator();
} catch (ServiceLocatorException se) {
System.err.println(se);
se.printStackTrace(System.err);
}
}

/**
*
*/
public ServiceLocator() throws ServiceLocatorException {
try {
ic = new InitialContext();
cache = Collections.synchronizedMap(new HashMap());
} catch (NamingException ne) {
throw new ServiceLocatorException(ne);
} catch (Exception e) {
throw new ServiceLocatorException(e);
}
}

/**
* @return
*/
public static ServiceLocator getInstance() {
return me;
}

/**
* @param dataSourceName
* @return
* @throws ServiceLocatorException
*/
public DataSource getDataSource(String dataSourceName) throws ServiceLocatorException {
DataSource dataSource = null;
try {
if (cache.containsKey(dataSourceName)) {
dataSource = (DataSource) cache.get(dataSourceName);
} else {
Context ctx = (Context)ic.lookup("java:comp/env");
dataSource = (DataSource)ctx.lookup(dataSourceName);
cache.put(dataSourceName, dataSource );
}
} catch (NamingException ne) {
throw new ServiceLocatorException(ne);
} catch (Exception e) {
throw new ServiceLocatorException(e);
}
return dataSource;
}

}