数据库连接池 c3p0

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package com.qrsx.util;

import java.beans.PropertyVetoException;
import java.sql.Connection;
import java.sql.SQLException;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class DBUtil {
private static final String DRIVERCLASS="com.mysql.jdbc.Driver";
private static final String JDBCURL="jdbc:mysql://localhost:3306/test";
private static final String USERNAME="root";
private static final String USERPASS="";
private static Connection connection=null;
private static ComboPooledDataSource dataSource = new ComboPooledDataSource();

static{
  try {
   dataSource.setDriverClass(DRIVERCLASS);
  } catch (PropertyVetoException e) {
   e.printStackTrace();
  }
  dataSource.setJdbcUrl(JDBCURL);
  dataSource.setUser(USERNAME);
  dataSource.setPassword(USERPASS);
  // the settings below are optional -- c3p0 can work with defaults
  // 设置初始连接池的大小！
        dataSource.setInitialPoolSize(2);
        // 设置连接池的最小值！
        dataSource.setMinPoolSize(1);
        // 设置连接池的最大值！
        dataSource.setMaxPoolSize(10);
        // 设置连接池中的最大Statements数量！
        dataSource.setMaxStatements(50);
        // 设置连接池的最大空闲时间！
        dataSource.setMaxIdleTime(60);
}
/**
* 得到一个数据库的链接
* @return
*/
public static Connection getConnection(){
  try {
   connection=dataSource.getConnection();
  } catch (SQLException e) {
   e.printStackTrace();
  }

  return connection;
}
/**
* 将数据库的连接归还连接池
*/
public static void closeConnection(){
  if(connection!=null)
  try {
   connection.close();
  } catch (SQLException e) {
   e.printStackTrace();
  }
}
}