使用proxool连接池配置教程

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