在web.xml添加
<resource-ref id="datasource">
<description>Database connection</description>
<res-ref-name>jdbc/test</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
ROOT.xml
<Context path="/test"
reloadable="false" crossContext="true" privileged="true" antiResourceLocking="false"
antiJARLocking="false" debug="0">
<Resource name="jdbc/test" auth="Container" type="javax.sql.DataSource" username="root" password="123456"
driverClassName="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost/test?characterEncoding=utf8" maxActive="100"
maxIdle="100" />
</Context>
需要的库类：
commons-dbcp.jar commons-pool.jar mysql-connector-java-3.1.11-bin.jar
程序编写：
InitialContext ctx=new InitialContext();
DataSource ds=(DataSource)ctx.lookup("java:comp/env/jdbc/test");
conn=ds.getConnection();