java 数据库连接池

 1. About

    java利用jdbc直接连接数据库，经常取得连接，用完释放，很浪费系统资源

2. Code

   Java代码

package com.cdv.mam.db;import java.sql.Connection;import java.sql.DatabaseMetaData;import java.sql.SQLException;import java.util.Properties;import javax.sql.DataSource;import org.apache.commons.dbcp.BasicDataSourceFactory;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;//import org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory;/** * tomcat数据库连接池管理类<br> * 使用为tomcat部署环境<br> * 需要在类路径下准备数据库连接配置文件dbcp.properties * */public class DBManager {  private static final Log log = LogFactory.getLog(DBManager.class);  private static final String configFile = "dbcp.properties";  private static DataSource dataSource;  static {    Properties dbProperties = new Properties();    try {      dbProperties.load(DBManager.class.getClassLoader()          .getResourceAsStream(configFile));      dataSource = BasicDataSourceFactory.createDataSource(dbProperties);      Connection conn = getConn();      DatabaseMetaData mdm = conn.getMetaData();      log.info("Connected to " + mdm.getDatabaseProductName() + " "          + mdm.getDatabaseProductVersion());      if (conn != null) {        conn.close();      }    } catch (Exception e) {      log.error("初始化连接池失败：" + e);    }  }  private DBManager() {  }  /**   * 获取链接，用完后记得关闭   *   * @see {@link DBManager#closeConn(Connection)}   * @return   */  public static final Connection getConn() {    Connection conn = null;    try {      conn = dataSource.getConnection();    } catch (SQLException e) {      log.error("获取数据库连接失败：" + e);    }    return conn;  }  /**   * 关闭连接   *   * @param conn   *      需要关闭的连接   */  public static void closeConn(Connection conn) {    try {      if (conn != null && !conn.isClosed()) {        conn.setAutoCommit(true);        conn.close();      }    } catch (SQLException e) {      log.error("关闭数据库连接失败：" + e);    }  }}

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原标题：java 数据库连接池

关键词：JAVA