Tomcat具有开箱即用的数据库连接池。要配置MySQL，例如：
<Context> <!-- maxActive: Maximum number of database connections in pool. Make sure you configure your mysqld max_connections large enough to handle all of your db connections. Set to -1 for no limit. --> <!-- maxIdle: Maximum number of idle database 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 database 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 username and password for database 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 database. --> <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/javatest"/></Context>
然后，您需要按以下方式配置连接：
public static void main(String[] args) throws Exception { PoolProperties p = new PoolProperties(); p.setUrl("jdbc:mysql://localhost:3306/mysql"); p.setDriverClassName("com.mysql.jdbc.Driver"); p.setUsername("root"); p.setPassword("password"); p.setJmxEnabled(true); p.setTestWhileIdle(false); p.setTestonBorrow(true); p.setValidationQuery("SELECT 1"); p.setTestonReturn(false); p.setValidationInterval(30000); p.setTimeBetweenEvictionRunsMillis(30000); p.setMaxActive(100); p.setInitialSize(10); p.setMaxWait(10000); p.setRemoveAbandonedTimeout(60); p.setMinEvictableIdleTimeMillis(30000); p.setMinIdle(10); p.setLogAbandoned(true); p.setRemoveAbandoned(true); p.setJdbcInterceptors("org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer"); DataSource datasource = new DataSource(); datasource.setPoolProperties(p); Connection con = null; con = datasource.getConnection();现在，按照通常的方式处理JDBC代码。
