最简单的JNDI对数据库操作
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<jsp:directive.page import="javax.sql.DataSource"/>
<jsp:directive.page import="java.sql.Connection"/>
<jsp:directive.page import="java.sql.ResultSet"/>
<jsp:directive.page import="javax.naming.InitialContext"/>
<jsp:directive.page import="java.sql.SQLException"/>
<%
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 'index.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>
<%
DataSource ds = null;
Connection conn = null;
ResultSet rs = null;
try{
InitialContext ctx=new InitialContext();
ds=(DataSource)ctx.lookup("java:comp/env/jdbc/e3java");
conn= ds.getConnection();
java.sql.Statement stmt = conn.createStatement();
//提示：users必须是数据库已有的表，
//这里的数据库前文提及的Data Source URL配置里包含的数据库。
String strSql = "select * from product";
rs= stmt.executeQuery(strSql);
while(rs.next()){
System.out.println(rs.getString(1));
}
}catch(Exception ex){
ex.printStackTrace();
}finally{
try {
rs.close();
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
%>
<body>
This is my JSP page. <br>
</body>
</html>
Tomcat中配置数据源
<!--
Context configuration file for the Tomcat Administration Web App
$Id: e3.xml,v 1.1 2006/10/02 02:32:16 zyz Exp $
-->
<Context path="/" docBase="项目目录路径"
debug="0" privileged="true" reloadable="true" >
<!-- Uncomment this Valve to limit access to the Admin app to localhost
for obvious security reasons. Allow may be a comma-separated list of
hosts (or even regular expressions).
<Valve className="org.apache.catalina.valves.RemoteAddrValve"
allow="127.0.0.1"/>
-->
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="localhost_e3_log." suffix=".txt"
timestamp="true"/>
<Resource name="jdbc/e3java" auth="Container" type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/e3java">
<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>maxActive</name>
<value>100</value>
</parameter>
<parameter>
<name>maxIdle</name>
<value>30</value>
</parameter>
<parameter>
<name>maxWait</name>
<value>10000</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:oracle:thin:@127.0.0.1:1521:orcl</value>
</parameter>
<parameter>
<name>username</name>
<value>zqtxw</value>
</parameter>
<parameter>
<name>password</name>
<value>111111</value>
</parameter>
<parameter>
<name>removeAbandoned</name>
<!-- Abandoned DB connections are removed and recycled -->
<value>true</value>
</parameter>
<parameter>
<name>removeAbandonedTimeout</name>
<!-- Use the removeAbandonedTimeout parameter to set the number of seconds a DB connection has been idle before it is considered abandoned. -->
<value>180</value>
</parameter>
<parameter>
<name>logAbandoned</name>
<!-- Log a stack trace of the code which abandoned -->
<value>true</value>
</parameter>
</ResourceParams>
</Context>