tomcat配置数据库连接池

<Resource name="jdbc/drp1"
     auth="Container" type="javax.sql.DataSource"
     driverClassName="com.mysql.jdbc.Driver"
     maxIdle="20"
     maxWait="500"
     username="root"
     password="root"
     url="jdbc:mysql://192.168.1.100/drp1"
     maxActive="1000"
     removeAbandoned="true"
     removeAbandonedTimeout="60"
     logAbandoned="true"/>

<?xml version='1.0' encoding='utf-8'?>
<!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->
<!-- The contents of this file will be loaded for each web application -->
<Context>

    <!-- Default set of monitored resources -->
    <WatchedResource>WEB-INF/web.xml</WatchedResource>

    <!-- <ResourceLink name="jdbc/drp1" global="jdbc/drp1" type="javax.sql.DataSource"/> -->
    <!-- Uncomment this to disable session persistence across Tomcat restarts -->
    <!--
    <Manager pathname="" />
    -->

    <Resource name="jdbc/drp1"
         auth="Container" type="javax.sql.DataSource"
         driverClassName="com.mysql.jdbc.Driver"
         maxIdle="20"
         maxWait="500"
         username="root"
         password="root"
         url="jdbc:mysql://192.168.1.100/drp1"
         maxActive="1000"
         removeAbandoned="true"
         removeAbandonedTimeout="60"
         logAbandoned="true"/>

    <!-- Uncomment this to enable Comet connection tacking (provides events
         on session expiration as well as webapp lifecycle) -->
    <!--
    <Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />
    -->

</Context>

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<%@page import="java.sql.Connection"%>
<%@page import="javax.naming.Context"%>
<%@page import="javax.naming.InitialContext"%>
<%@page import="javax.sql.DataSource"%>
<%@page import="java.sql.Statement"%>
<%@page import="java.sql.ResultSet"%>
<%
   //连接池的获取
    Connection conn = null;
    ResultSet rs  =null;
    Statement stmt = null;
    // 初始化查找命名空间
    Context initContext = new InitialContext();
    // 找到DataSource
    DataSource ds = (DataSource) initContext.lookup("java:comp/env/jdbc/drp1");
    if(ds!=null){
        out.println("已经获得DataSource!");
        out.println("<br>");
        conn = ds.getConnection();
       try{
        stmt = conn.createStatement();
        String sql ="select * from t_user";
        rs = stmt.executeQuery(sql);
        out.println("以下是从数据库中读取出来的数据:<br>");
            while(rs.next()){
                out.println("<br>");
                out.println(rs.getString("user_id"));
            }
       }catch(Exception ex){
         ex.printStackTrace();
       }finally{
          //conn.close();
          rs.close();
          stmt.close();
       }
   }
%>

<resource-ref>
    <description>DB Connection</description>
    <res-ref-name>jdbc/drp1</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref>