以前配置过一次，感觉不是太好用，现在又试了一次，效果还不错，记录一下，以备后用
1.WEB项目的META-INF目录(不是WEB-INF)下新建XML配置文件context.xml，内容如下：
<?xml version="1.0" encoding="UTF-8"?>
<Context path="/jrtSrv" docBase="jrtSrv" reloadable="true" crossContext="true">
<Resource name="jdbc/MSSql" auth="Container" type="javax.sql.DataSource"
maxActive="100"
maxIdle="30"
maxWait="5000"
username="sa"
validationQuery="select 1"
password="youpassword"
driverClassName="com.microsoft.jdbc.sqlserver.SQLServerDriver"
url="jdbc:microsoft:sqlserver://192.168.56.101:1433;DatabaseName=MYDB"/>
</Context>
注意validationQuery="select 1" 这句，非常重要，对于网络异常或者数据库重启，可以对connection 进行重新建立
2.在项目WEB-INF下的WEB.xml中添加如下内容:
<resource-ref>
<description>DBConnection</description>
<res-ref-name>jdbc/MSSql</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
3.OK 收工，写个t.jsp页面测试下：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@page contentType="text/html; charset=GB2312"%>
<%@page import="java.sql.*"%>
<%@page import="javax.naming.*"%>
<%@page import="javax.sql.DataSource"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'MyJsp.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%
String tablename = "t_beds";
String sqlstr;
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
Context ctx = null;
try {
ctx = new InitialContext();
DataSource ds = (DataSource) ctx
.lookup("java:comp/env/jdbc/MSSql");
con = ds.getConnection();
stmt = con.createStatement();
sqlstr = "select * from " + tablename;
rs = stmt.executeQuery(sqlstr);
ResultSetMetaData rsmd = rs.getMetaData();//获取元数据
int j = 0;
j = rsmd.getColumnCount();//获得结果集的行数
for (int k = 0; k < j; k++) {
out.print(rsmd.getColumnName(k + 1));//显示表中字段属性
out.print("\t");
}
out.print("<br>");
/*3.读取查询结果 */
while (rs.next()) {
out.print(rs.getString("id"));
out.print("\t");
out.println(rs.getString("stateId"));
out.print("\t");
out.print(rs.getString("updateTime"));
out.print("\t");
out.print("<br>");
}
}
/*4.异常处理 */
catch (NamingException e1) {
out.println(e1.toString());
out.println("驱动程序没有找到！");
} catch (SQLException e2) {
out.println(e2.toString());
out.println("数据库异常！");
}
/*5.关闭数据库 */
finally {
try {
if (rs != null)
rs.close();
if (stmt != null)
stmt.close();
if (con != null)
con.close();
} catch (Exception e) {
out.println(e.toString());
}
}
%>
</body>
</html>
----------------------------------------------------------
参考文章：
http://blog.sina.com.cn/s/blog_570f6d940100sor4.html
还有一篇百度文库上的文章，找不到出处了