0:在tomcat/lib或在工程WEB-INF/lib中加入數據庫連接驅動包

1:在tomcat/conf/context.xml下配置,在<Context>節中加入
	<Resource name="jdbc/jndiTest" auth="Container"     
              type="javax.sql.DataSource"  maxActive="100" maxIdle="30" 
              maxWait="10000"   username="sa" password="123"         
              driverClassName="com.microsoft.jdbc.sqlserver.SQLServerDriver"
              url="jdbc:sqlserver://localhost\sql2005:1433;DatabaseName=master"/>

2:在工程的web.xml下配置
  <resource-ref>
	<description>JNDI DataSource</description>
	<res-ref-name>jdbc/jndiTest</res-ref-name>
	<res-type>javax.sql.DataSource</res-type>
	<res-auth>Container</res-auth>
  </resource-ref>

3:獲取連接
import java.sql.Connection;

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

public class JDNITest {
	public static Connection getConnection(){
			try {
				Context ic = new InitialContext();
				DataSource source = (DataSource)ic.lookup("java:comp/env/jdbc/jndiTest");
				//建議把DataSource保存為全局靜態變量
				return  source.getConnection();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			return null;
	}
}