1)下载mm.mysql-2.0.14-bin.jar包，放在tomcat目录下的common/lib文件夹中 2)在tomcat目录下的conf/server.xml中的</Host>前加入(注意:全部大写的地方要替换成你自己的东西) <!--for mysql database connection pool-->
<Context path="/APPLICATION_NAME" docBase="APPLICATIOIN_NAME" debug="5" reloadable="true" crossContext="true">
<Logger className="org.apache.catalina.logger.FileLogger" prefix="localhost_DBTest_log." suffix=".txt" timestamp="true"/>
<Resource name="jdbc/DATABASE_NAME" auth="Container" type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/DATABASE_NAME">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</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/DATABASE_NAME?autoReconnect=true</value>
</parameter>
<!-- MySQL dB username and password for dB connections -->
<parameter>
<name>username</name>
<value>DB_USERNAME</value>
</parameter>
<parameter>
<name>password</name>
<value>DB_PASSWORD</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>
</ResourceParams>
</Context>
这样就算连接完了 3)测试: DATABASE_NAME:testdb APPLICATION_NAME:mysqlTest 在testdb数据库里新建表userinfo id | username
1 aaa
2 bbb 4)web.xml <web-app>
<resource-ref>
<description>MySQL Datasource example</description>
<res-ref-name>jdbc/testdb</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</web-app>
5)index.jsp <%@ page contentType="text/html;charset=gb2312" language="java" import="java.sql.*,javax.naming.*"%> <% Context initCtx = new InitialContext();
Context ctx = (Context) initCtx.lookup("java:comp/env");
Object obj = (Object) ctx.lookup("jdbc/testdb");
javax.sql.DataSource ds = (javax.sql.DataSource)obj;
Connection conn = ds.getConnection();
Statement stmt = conn.createStatement();
String strSql = "select * from userinfo";
ResultSet rs = stmt.executeQuery(strSql);%> <body>
<%while(rs.next()){%>
<p>
<%=rs.getString("username")%>
</p>
<%}%>
<body> 可以看到输出结果为: aaa
bbb 
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