java配置数据库连接池以mysql和sqlserver为例

配置tomcat下面的content.xml

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<!-- The contents of this file will be loaded for each web application -->
<Context>
<Resource name="jdbc/mysql"   
       auth="Container"   
           
       type="javax.sql.DataSource"   
       driverClassName="com.mysql.jdbc.Driver"     
	   url="jdbc:mysql://localhost:3306/com?useUnicode=true&amp;characterEncoding=UTF-8"
       username="root"   
       password="root"   
       maxActive="100"   
       maxIdle="2"   
       maxWait="10000" />
      <ResourceParams name="jdbc/mysql">
         <parameter>
         <name>removeAbandoned</name>
   	 <value>true</value>
      </parameter>
      <parameter>
        <name>removeAbandonedTimeout</name>
        <value>60</value>
      </parameter>
    <parameter>
       <name>logAbandoned</name>
    <value>true</value>
    </parameter>
   </ResourceParams>
  <Resource name="jdbc/sqlserver"   
       auth="Container"
	   type="javax.sql.DataSource"   
	   driverClassName="com.microsoft.jdbc.sqlserver.SQLServerDriver"   
	   url="jdbc:microsoft:sqlserver://localhost:1433;databaseName=fashion"   
	   username="sa"   
	   password=""   
	   maxActive="100"   
	   maxIdle="30"   
	   maxWait="10000" />
      <ResourceParams name="jdbc/sqlserver">
         <parameter>
         <name>removeAbandoned</name>
   	 <value>true</value>
      </parameter>
      <parameter>
        <name>removeAbandonedTimeout</name>
        <value>60</value>
      </parameter>
    <parameter>
       <name>logAbandoned</name>
    <value>true</value>
    </parameter>
   </ResourceParams>-->
    <!-- Default set of monitored resources -->
 <!--   <WatchedResource>WEB-INF/web.xml</WatchedResource>-->
	<WatchedResource>WEB-INF/web.xml</WatchedResource>
    <!-- Uncomment this to disable session persistence across Tomcat restarts -->
    <!--
    <Manager pathname="" />
    -->

    <!-- 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>

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?设置项目目录下面的WEB-INF下面的web.xml文件?在里面加入

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	<!-- 数据源 -->
     <resource-ref>
  	    <description>DB Connection</description>   
    	<res-ref-name>jdbc/mysql</res-ref-name>   
    	<res-type>javax.sql.DataSource</res-type>   
    	<res-auth>Container</res-auth>   
 	 </resource-ref>
 	 <resource-ref>
  	    <description>DB</description>   
    	<res-ref-name>jdbc/sqlserver</res-ref-name>   
    	<res-type>javax.sql.DataSource</res-type>   
    	<res-auth>Container</res-auth>   
 	 </resource-ref>

测试文件

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<%@ page contentType="text/html;charset=UTF-8" import="com.shop.util.*"%>
<%@ page import="java.sql.*"%>    
<%@ page import="javax.sql.*"%>     
<%@ page import="javax.naming.*"%> 
<%@ taglib uri="/struts-tags" prefix="s" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<%
DataSource ds = null;
InitialContext ctx=new InitialContext();    
ds=(DataSource)ctx.lookup("java:comp/env/jdbc/sqlserver");    
Connection conn = ds.getConnection();   
%>
		  		<%
	Statement stmt=conn.createStatement();
	String sql_gun="sele