JAVA EE JSP_JNDI
dsfdsa
http://lindows.iteye.com/admin/blogs/213348
public class DBAccess {
private static DataSource ds = null;
private static Connection connection = null;
public static Connection getCon() {
try {
Context ctx = new InitialContext();
String lookUpString = "java:comp/env/jdbc/myoracle";
ds = (DataSource) ctx.lookup(lookUpString);
connection = ds.getConnection();
} catch (NamingException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return connection;
}
public static void closeCon(Connection con){
if (null != con){
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
Tomcat 6 数据源与连接池配置
http://www.blogjava.net/ec2008/archive/2008/07/19/216063.html
project:test
Driver path:
D:\workspace\test\WebRoot\WEB-INF\lib\ojdbc14.10g.jar
Datasource config
D:\tomcat6.0\conf\server.xml
<GlobalNamingResources>
<!-- 其中将数据源参数配置在tomcat全局连接池中-->
<Resource
name="jdbc/oracle "
type="javax.sql.DataSource"
maxActive="4"
maxIdle="2"
username="scott"
maxWait="5000"
driverClassName="oracle.jdbc.driver.OracleDriver"
validationQuery="select 1 from dual"
password="tiger"
url="jdbc:oracle:thin:@localhost:1521:orcl"/>
</GlobalNamingResources>
JNDI config
D:\workspace\test\WebRoot\WEB-INF\web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee " xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance " xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd "> <!-- 其中加入应用JNDI配置 --> <resource-ref> <description>DB Connection </description> <!-- JNDI 命名--> <res-ref-name>jdbc/oracle </res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Application </res-auth> </resource-ref> 或 <resource-ref> <description>DB Connection </description> <res-ref-name>jdbc/oracle </res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container </res-auth> </resource-ref> </web-app>
Tomcat 6 数据源与连接池配置 方法二
project:test
Driver path:
D:\workspace\test\WebRoot\WEB-INF\lib\ojdbc14.10g.jar
Datasource config
D:\tomcat6.0\conf\Catalina\localhost\test.xml
或
D:\tomcat6.0\conf \context.xml
<?xml version="1.0" encoding="UTF-8"?>
<Context path="/test " docBase="D:\workspace\test\WebRoot " reloadable="true">
<!-- 其中将数据源参数配置在tomcat局部连接池中-->
<Resource name="jdbc/oracle"
type="javax.sql.DataSource"
username="scott"
password="tiger"
driverClassName="oracle.jdbc.OracleDriver"
validationQuery="select 1 from dual"
maxIdle="2"
maxWait="5000"
url="jdbc:oracle:thin:@localhost:1521:orcl"
maxActive="4"/>
</Context>
page test ok
D:\workspace\test\WebRoot\index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<%@ page import="java.sql.*"%>
<%@ page import="javax.naming.*"%>
<%@ page import="javax.sql.*"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>tomcat datasource test</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>
<%
Context initContext = new InitialContext();
//java:/comp/env 或 java:/comp/env/ 固定写法
Context envContext = (Context) initContext
.lookup("java:/comp/env/");
DataSource ds = (DataSource) envContext.lookup("jdbc/oracle");
//方法二
//DataSource ds = (DataSource) initContext.lookup("java:/comp/env/jdbc/oracle");
Connection conn = ds.getConnection();
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("select * from dept");
out.println("结果集是否为空:" + (rs == null) + "<p>");
while (rs.next()) {
String deptno = rs.getString(1);
String dname = rs.getString(2);
String loc = rs.getString(3);
out.println("\t部门编号:" + deptno + "\t部门名称:" + dname + " 地点:"
+ "\t" + loc + "<p>");
}
out.println("finally");
try {
if (rs != null) {
rs.close();
}
if (stmt != null) {
stmt.close();
}
if (conn != null) {
conn.close();
}
} catch (SQLException e2) {
e2.printStackTrace();
}
%>
</body>
</html>
end