dbcp连接池实现

DBCP是Apache的一个开源项目：
commons.dbcp.jar
http://jakarta.apache.org/commons/dbcp/index.html

DBCP依赖Apache的另外2个开源项目
commons.collections.jar和commons.pool.jar

下载这些包并将这些包的路径添加到classpath中就可以使用dbcp做为项目中的数据库连接池使用了。

以下是我的连接池

java 代码
package selfservice;   
  
import java.io.FileNotFoundException;   
import java.io.IOException;   
import java.sql.Connection;   
import java.sql.DriverManager;   
import java.sql.ResultSet;   
import java.sql.SQLException;   
import java.sql.Statement;   
  
import org.apache.commons.dbcp.ConnectionFactory;   
import org.apache.commons.dbcp.DriverManagerConnectionFactory;   
import org.apache.commons.dbcp.PoolableConnectionFactory;   
import org.apache.commons.dbcp.PoolingDriver;   
import org.apache.commons.pool.ObjectPool;   
import org.apache.commons.pool.impl.GenericObjectPool;   
  
  
public class PoolManager {     
    private static String    
            driver="oracle.jdbc.driver.OracleDriver",//驱动   
            url = "jdbc:oracle:thin:@192.168.0.40:1521:drcom",//URL   
            Name="drcom",//用户名   
            Password="drcom";//密码   
       
    private static Class driverClass = null;   
    private static ObjectPool connectionPool = null;   
  
    public PoolManager(){          
    }      
       
    /**  
     * 装配配置文件  
     * initProperties      
     */  
    private static void loadProperties(){   
        try {   
            java.io.InputStream stream = new java.io.FileInputStream("config.properties");   
            java.util.Properties props = new java.util.Properties();   
            props.load(stream);   
               
            driver = props.getProperty("ORACLE_DRIVER");   
            url = props.getProperty("ORACLE_URL");   
            Name = props.getProperty("ORACLE_LOGIN_NAME");   
            Password = props.getProperty("ORACLE_LOGIN_PASSWORD");   
               
        } catch (FileNotFoundException e) {   
            System.out.println("读取配置文件异常");            
        } catch(IOException ie){   
            System.out.println("读取配置文件时IO异常");   
        }   
    }   
       
    /**   
     * 初始化数据源   
     */    
    private static synchronized void initDataSource() {            
        if (driverClass == null) {    
            try {    
                driverClass = Class.forName(driver);    
            } catch (ClassNotFoundException e) {    
                e.printStackTrace();   
            }    
        }    
    }    
    
    /**   
     * 连接池启动   
     * @throws Exception   
     */    
    public static void StartPool() {   
        loadProperties();   
        initDataSource();    
        if (connectionPool != null) {    
            ShutdownPool();    
        }     
        try {    
            connectionPool = new GenericObjectPool(null);    
            ConnectionFactory connectionFactory = new DriverManagerConnectionFactory(url, Name, Password);    
            PoolableConnectionFactory poolableConnectionFactory = new PoolableConnectionFactory(connectionFactory, connectionPool, null, null, false, true);    
            Class.forName("org.apache.commons.dbcp.PoolingDriver");    
            PoolingDriver driver = (PoolingDriver) DriverManager.getDriver("jdbc:apache:commons:dbcp:");    
            driver.registerPool("dbpool", connectionPool);                 
            System.out.println("装配连接池OK");    
        } catch (Exception e) {    
            e.printStackTrace();   
        }    
    }    
    
    /**   
     * 释放连接池   
     */    
    public static void ShutdownPool() {    
        try {    
            PoolingDriver driver = (PoolingDriver) DriverManager.getDriver("jdbc:apache:commons:dbcp:");    
            driver.closePool("dbpool");   
        } catch (SQLException e) {    
            e.printStackTrace();   
        }    
    }        
    
    /**   
     * 取得连接池中的连接   
     * @return   
     */    
    public static Connection getConnection() {    
        Connection conn = null;    
        if(connectionPool == null)    
            StartPool();    
        try {    
            conn = DriverManager.getConnection("jdbc:apache:commons:dbcp:dbpool");    
        } catch (SQLException e) {    
            e.printStackTrace();   
        }    
        return conn;    
    }    
       
    /**  
     * 获取连接  
     * getConnection  
     * @param name  
     * @return  
     */  
    public static Connection getConnection(String name){   
        return getConnection();   
    }   
    /**  
     * 释放连接  
     * freeConnection  
     * @param conn  
     */  
    public static void freeConnection(Connection conn){   
        if(conn != null){   
            try {   
                conn.close();   
            } catch (SQLException e) {                 
                e.printStackTrace();   
            }   
        }   
    }   
    /**  
     * 释放连接  
     * freeConnection  
     * @param name  
     * @param con  
     */  
    public static void freeConnection (String name,Connection con){   
        freeConnection(con);   
    }   
       
    /**  
     * 例子  
     * main  
     * @param args  
     */  
    public static void main(String[] args) {           
        try {   
            Connection conn = PoolManager.getConnection();   
            if(conn != null){   
                Statement statement = conn.createStatement();   
                ResultSet rs = statement.executeQuery("select * from tblgxinterface");   
                int c = rs.getMetaData().getColumnCount();   
                while(rs.next()){                      
                    System.out.println();   
                    for(int i=1;i<=c;i++){   
                        System.out.print(rs.getObject(i));   
                    }   
                }   
                rs.close();   
            }   
            PoolManager.freeConnection(conn);   
        } catch (SQLException e) {             
            e.printStackTrace();   
        }   
  
    }   
  
}   

以上创建一个连接池，并从连接池中得到连接，连接池会管理每个连接，以上测试通过。


转自：http://tvjody.iteye.com/blog/117225