连接池 dpcp c3p0

package com.cn.utils;

import java.io.InputStream;
import java.lang.reflect.Field;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

import javax.sql.DataSource;

import org.apache.commons.dbcp.BasicDataSourceFactory;

//dbcp连接池
public class JdbcUtils_dpcp {
	private static DataSource ds = null;

	static {
		try {
			// 读取配置文件
			InputStream is = JdbcUtils_dpcp.class.getClassLoader()
					.getResourceAsStream("dbcpconfig.properties");
			Properties prop = new Properties();
			prop.load(is);
			// 创建数据源
			BasicDataSourceFactory factory = new BasicDataSourceFactory();
			ds = factory.createDataSource(prop);
		} catch (Exception e) {
			throw new ExceptionInInitializerError(e);
		}
	}

	public static Connection getConnection() throws SQLException {
		return ds.getConnection();

	}

	public static void release(Connection conn, ResultSet rs, Statement st) {
		if (rs != null) {
			try {
				rs.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
			rs = null;
		}
		if (st != null) {
			try {
				st.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
			st = null;
		}
		if (conn != null) {
			try {
				conn.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}