一、把相應的JDBC包放置到TOMCAT安裝目錄的COMMON/LIB目錄中
二、TOMCAT的配置文件的內容（以ORACLE， THIN連接為例）
<?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文件的內容
<?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代碼的書寫

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;
????? }

}

在TOMCAT5.0.27 中利用數據鏈接緩沖池