// Tomcat4 + Mysql 4ӳ䷨
޸server.xml 
<!-- Tomcat Root Context --> 
<Context path="" docBase="ROOT" debug="0"> 
<Logger className="org.apache.catalina.logger.FileLogger" 
prefix="localhost_DBTest_log." suffix=".txt" 
timestamp="true"/> 
<Resource name="jdbc/MysqlDB" 
auth="Container" 
type="javax.sql.DataSource"/> 
<ResourceParams name="jdbc/MysqlDB"> 
<parameter> 
<name>factory</name> 
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value> 
</parameter> 
<!-- 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. 
--> 
<parameter> 
<name>maxActive</name> 
<value>100</value> 
</parameter> 
<!-- Maximum number of idle dB connections to retain in pool. 
Set to 0 for no limit. 
--> 
<parameter> 
<name>maxIdle</name> 
<value>30</value> 
</parameter> 
<!-- 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. 
--> 
<parameter> 
<name>maxWait</name> 
<value>10000</value> 
</parameter> 
<!-- MySQL dB username and password for dB connections --> 
<parameter> 
<name>username</name> 
<value>sa</value> 
</parameter> 
<parameter> 
<name>password</name> 
<value>111111</value> 
</parameter> 
<!-- Class name for mm.mysql JDBC driver --> 
<parameter> 
<name>driverClassName</name> 
<value>org.gjt.mm.mysql.Driver</value> 
</parameter> 
<!-- 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. 
--> 
<parameter> 
<name>url</name> 
<value>jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEnco ding=GBK</value> 
<!--must use &amp; not use  & -->
</parameter> 
</ResourceParams> 
</Context> 

// ޸webapps/ROOT/INF-WEB/web.xml 
<?xml version="1.0" encoding="ISO-8859-1"?> 
<!DOCTYPE web-app PUBLIC 
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" 
"http://java.sun.com/dtd/web-app_2_3.dtd"> 
<web-app> 
<description>MySQL Test App</description> 
<resource-ref> 
<description>DB Connection</description> 
<res-ref-name>jdbc/MysqlDB</res-ref-name> 
<res-type>javax.sql.DataSource</res-type> 
<res-auth>Container</res-auth> 
</resource-ref> 
</web-app> 

//Testdb.jspʾ
<%@ page contentType="text/html;charset=GBK"%> 
<%@ page import= "java.sql.* " %> 
<%@ page import= "javax.naming.* "%> 
<% 
try{ 
Context initCtx = new InitialContext(); 
Context ctx = (Context) initCtx.lookup("java:comp/env"); 
//ȡӳض 
Object obj = (Object) ctx.lookup("jdbc/MysqlDB"); 
//ת 
javax.sql.DataSource ds = (javax.sql.DataSource)obj; 
Connection conn = ds.getConnection(); 
Statement stmt = conn.createStatement(); 
String strSql = " insert into test(id,name) values('007','hello,й!') "; 
stmt.executeUpdate(strSql); 
strSql = " select id,name from test "; 
ResultSet rs = stmt.executeQuery(strSql); 
while(rs.next()){ 
out.println(rs.getString(1)); 
out.println(rs.getString(2)+"<BR>"); 
} 
conn.close(); 
}catch(Exception ex){ 
ex.printStackTrace(); 
throw new SQLException("cannot get Connection pool."); 
} 
%> 
<hr> 
