proxool连接池的优点：
1.透明度：透明地将连接池添加到现有的JDBC驱动程序。
2.开源：我们的许可证允许您灵活地将其用于商业和其他开源产品。
3.标准：符合J2SE API，使您有信心开发标准。
4.控制：您可以监视数据库连接的性能并监听连接事件
5.易于使用：您可以轻松地使用JDBC API，XML或Java属性文件进行配置。
这里有用到两种数据库，一个是mysql，一个是hsqldb，需要用到的包一共有8个，分别是：
mysql驱动包：mysql-connector-java-5.1.43-bin.jar
hsql驱动包：hsqldb.jar
proxool连接池的包：proxool-0.9.1.jar，proxool-cglib.jar，cglib-nodep-2.1_3.jar，jarjar-0.6.jar
还有：commons-logging-1.0.4.jar，commons-logging-api-1.1.jar
用到的包有上面几个（有点多，去官网下载就好了
//类配
try {
Class.forName("org.logicalcobwebs.proxool.ProxoolDriver");
Connection conn=DriverManager.getConnection("proxool.example:com.mysql.jdbc.Driver:jdbc:mysql://localhost:3306/test","root","123456");
System.out.println(conn); } catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} //xml配置 (无需配置web.xml要注意DriverManager.getConnection("proxool.ljg-xml")里面的参数必须是proxool.别名)
try {
JAXPConfigurator.configure(new InputSource(DBConfig.class.getResourceAsStream("/db.xml")), false);
Connection conn = DriverManager.getConnection("proxool.ljg-xml");
System.out.println(conn);
} catch (ProxoolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
/*
db.xml必须在src目录下（不在任何一个包中）
代码如下：
<?xml version="1.0" encoding="ISO-8859-1"?>
<!-- the proxool configuration can be embedded within your own application's.
Anything outside the "proxool" tag is ignored. -->
<something-else-entirely>
<proxool>
<alias>ljg-xml</alias>
<driver-url>jdbc:mysql://localhost:3306/test</driver-url>
<driver-class>com.mysql.jdbc.Driver</driver-class>
<driver-properties>
<property name="user" value="root"/>
<property name="password" value="2311664"/>
</driver-properties>
<maximum-connection-count>10</maximum-connection-count>
<house-keeping-test-sql>select CURRENT_DATE</house-keeping-test-sql>
</proxool>
</something-else-entirely>
*/
//这是连接hsqldb的
//启动hsqldb需要运行hsqldb.jar包下的两个文件：
//1.运行org.hsqldb.server.Server
//2.运行org.hsqldb.util.DatabaseManagerSwing
//properties配置(无需配置web.xml要注意DriverManager.getConnection("proxool.ljg-properties")里面的参数必须是proxool.别名)
Properties pro=new Properties();
try {
pro.load(DBConfig.class.getResourceAsStream("/hsqldb.properties"));
PropertyConfigurator.configure(pro);
Connection conn=DriverManager.getConnection("proxool.hsqlljg-properties");
Statement st=conn.createStatement();
ResultSet rs=st.executeQuery("SELECT * FROM \"PUBLIC\".\"USERINFO\"");
System.out.println(conn);
while(rs.next()) {
System.out.println(rs.getString(1));
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ProxoolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
/*
同上hsqldb.properties也要在src目录下代码如下：
jdbc-0.proxool.alias=hsqlljg-properties
jdbc-0.proxool.driver-url=jdbc:hsqldb:hsql://localhost/
jdbc-0.proxool.driver-class=org.hsqldb.jdbcDriver
jdbc-0.user=SA
jdbc-0.password=
jdbc-0.proxool.maximum-connection-count=10
jdbc-0.proxool.house-keeping-test-sql=select CURRENT_DATE
url和驱动根据实际而定
*/ //这是mysql的，只需要把配置的驱动和url修改即可
Properties pro=new Properties();
try {
pro.load(DBConfig.class.getResourceAsStream("/db.properties"));
PropertyConfigurator.configure(pro);
Connection conn=DriverManager.getConnection("proxool.ljg-properties");
System.out.println(conn);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ProxoolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
/*
db.properties配置文件信息如下：
jdbc-0.proxool.alias=ljg-properties
jdbc-0.proxool.driver-url=jdbc:mysql://localhost:3306/test
jdbc-0.proxool.driver-class=com.mysql.jdbc.Driver
jdbc-0.user=root
jdbc-0.password=2311664
jdbc-0.proxool.maximum-connection-count=10
jdbc-0.proxool.house-keeping-test-sql=select CURRENT_DATE
*/
//在类里写properties文件配置
try {
Properties info = new Properties();
info.setProperty("proxool.maximum-connection-count", "10");
info.setProperty("proxool.house-keeping-test-sql", "select CURRENT_DATE");
info.setProperty("user", "root");
info.setProperty("password", "2311664");
String alias = "ljg-properties";
String driverClass = "com.mysql.jdbc.Driver";
String driverUrl = "jdbc:mysql://localhost:3306/test";
String url = "proxool." + alias + ":" + driverClass + ":" + driverUrl;
ProxoolFacade.registerConnectionPool(url, info);
Connection conn=DriverManager.getConnection("proxool.ljg-properties");
System.out.println(conn);
} catch (ProxoolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}配置成功运行会输出像这么一句代码：
如果要配置管理页面只需在web.xml中添加如下代码：
<servlet>
<servlet-name>proxool</servlet-name>
<servlet-class>org.logicalcobwebs.proxool.admin.servlet.AdminServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>proxool</servlet-name>
<url-pattern>/admin</url-pattern>
</servlet-mapping> <servlet>
<servlet-name>ServletConfigurator</servlet-name>
<servlet-class>org.logicalcobwebs.proxool.configuration.ServletConfigurator</servlet-class>
<init-param>
<param-name>xmlFile</param-name>
<param-value>WEB-INF/proxool.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
在lib下创建proxool.xml文件，代码如下：
<?xml version="1.0" encoding="ISO-8859-1"?>
<!-- the proxool configuration can be embedded within your own application's.
Anything outside the "proxool" tag is ignored. -->
<something-else-entirely>
<proxool>
<alias>ljg-xml</alias>
<driver-url>jdbc:mysql://localhost:3306/test</driver-url>
<driver-class>com.mysql.jdbc.Driver</driver-class>
<driver-properties>
<property name="user" value="root"/>
<property name="password" value="2311664"/>
</driver-properties>
<maximum-connection-count>10</maximum-connection-count>
<house-keeping-test-sql>select CURRENT_DATE</house-keeping-test-sql>
</proxool>
</something-else-entirely>
配置完后在浏览器打开localhost:8080/myapp/admin 即可访问