1 下载Tomcat最新版本
下载地址：http://tomcat.apache.org/
2 下载mysql最新版本以及最近版本的驱动程序
下载地址：http://dev.mysql.com/downloads
http://dev.mysql.com/downloads/connector
并将下载的mysql-connector-java-5.1.0-bin.jar a连接文件放到$CATALINA_HOME/lib/下。
3 安装mysql数据库
4 创建一个tomcat应用程序，工程的名字为DBTest
5 修改$CATALINA_HOME/conf/ context.xml为以下内容
<Context path="/DBTest" docBase="DBTest"
debug="5" reloadable="true" crossContext="true">
<!-- maxActive: Maximum number of dB connections in pool. Make sure you configure your mysqld max_connections large enough to handle
all of your db connections. Set to 0 for no limit.
-->
<!-- maxIdle: Maximum number of idle dB connections to retain in pool.
Set to -1 for no limit. See also the DBCP documentation on this
and the minEvictableIdleTimeMillis configuration parameter.
-->
<!-- maxWait: Maximum time to wait for a dB connection to become available
in ms, in this example 10 seconds. An Exception is thrown if
this timeout is exceeded. Set to -1 to wait indefinitely.
-->
<!-- username and password: MySQL dB username and password for dB connections -->
<!-- driverClassName: Class name for the old mm.mysql JDBC driver is
org.gjt.mm.mysql.Driver - we recommend using Connector/J though.
Class name for the official MySQL Connector/J driver is com.mysql.jdbc.Driver.
-->
<!-- url: The JDBC connection url for connecting to your MySQL dB.
The autoReconnect=true argument to the url makes sure that the
mm.mysql JDBC Driver will automatically reconnect if mysqld closed the
connection. mysqld by default closes idle connections after 8 hours.
-->
<Resource name="jdbc/TestDB" auth="Container" type="javax.sql.DataSource"
maxActive="100" maxIdle="30" maxWait="10000"
username="javauser" password="javadude" driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/ jtest?autoReconnect=true"/></Context>
此时要注意修改自己的数据库的用户名和密码
我建立的
数据库：jtest
用户名：javauser
密码：javadude
6 修改工程目录下的web.xml文件添加如下
<description>MySQL Test App</description>
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/TestDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>7 创建一个java类
package com.test;
/*
* DBTest.java
*
* Created on 2007/06/07, 10:33:02
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/
/**
*
* @author wangzicai
*/
import javax.naming.*;
import javax.sql.*;
import java.sql.*;
public class DBTest {
String foo = "Not Connected";
int bar = -1;
public void init() {
try{
Context ctx = new InitialContext();
if(ctx == null )
throw new Exception("Boom - No Context");
DataSource ds =
(DataSource)ctx.lookup(
"java:comp/env/jdbc/TestDB");
if (ds != null) {
Connection conn = ds.getConnection();
if(conn != null) {
foo = "Got Connection "+conn.toString();
Statement stmt = conn.createStatement();
ResultSet rst =
stmt.executeQuery(
" select * from test ");
if(rst.next()) {
foo=rst.getString(1);
bar=208;
}
conn.close();
}
} }catch(Exception e) {
e.printStackTrace();
}
}
public String getFoo() { return foo; }
public int getBar() { return bar;}
}
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