dbcp數據庫連接池實例

import org.apache.log4j.Logger;

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;


/**
 * dbcp 數據庫連接池
 * @return
 */
public class DataSourceManage {
	 
	 private static final Logger log = Logger.getLogger(DataSourceManage.class);
	 private static final String configFile = "dbcp.properties";

	 private static DataSource dataSource;

	 static {
	  Properties dbProperties = new Properties();
	  try {
	   dbProperties.load(DataSourceManage.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("初始化連接池失敗：" + e);
	  }
	 }

	 private DataSourceManage() {
	 }

	 /**
	  * 獲取連接，用完後記得關閉
	  * 
	  * @see {@link DBManager#closeConn(Connection)}
	  * @return
	  */
	 public static final Connection getConn() {
	  Connection conn = null;
	  try {
	   conn = dataSource.getConnection();
	  } catch (SQLException e) {
	   log.error("獲取數據庫連接失敗：" + e);
	  }
	  return conn;
	 }

	 /**
	  * 關閉連接
	  * 
	  * @param conn
	  *  需要關閉的連接
	  */
	 public static void closeConn(Connection conn) {
	  try {
	   if (conn != null && !conn.isClosed()) {
	    conn.setAutoCommit(true);
	    conn.close();
	   }
	  } catch (SQLException e) {
	   log.error("關閉數據庫連接失敗：" + e);
	  }
	 }

}