java通过dbcp 配置连接池访问数据库

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配置文件

#连接设置driverClassName=com.mysql.jdbc.Driverurl=jdbc:mysql://localhost:3306/leitestusername=rootpassword=010910#<!-- 初始化连接 -->initialSize=10#最大连接数量maxActive=50#<!-- 最大空闲连接 -->maxIdle=20#<!-- 最小空闲连接 -->minIdle=5#<!-- 超时等待时间以毫秒为单位 6000毫秒/1000等于60秒 -->maxWait=60000#JDBC驱动建立连接时附带的连接属性属性的格式必须为这样：[属性名=property;] #注意："user" 与 "password" 两个属性会被明确地传递，因此这里不需要包含他们。connectionProperties=useUnicode=true;characterEncoding=gbk#指定由连接池所创建的连接的自动提交（auto-commit）状态。defaultAutoCommit=true#driver default 指定由连接池所创建的连接的只读（read-only）状态。#如果没有设置该值，则“setReadOnly”方法将不被调用。（某些驱动并不支持只读模式，如：Informix）defaultReadOnly=#driver default 指定由连接池所创建的连接的事务级别（TransactionIsolation）。#可用值为下列之一：（详情可见javadoc。）NONE,READ_UNCOMMITTED, READ_COMMITTED, REPEATABLE_READ, SERIALIZABLEdefaultTransactionIsolation=READ_UNCOMMITTED

数据库访问文件

package org.lei.util;import java.io.IOException;import java.io.InputStream;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.util.Properties;import javax.sql.DataSource;import org.apache.commons.dbcp.BasicDataSource;import org.apache.commons.dbcp.BasicDataSourceFactory;/** * @author renlei  * @E-mail:renlei0109@yeah.net * @version 创建时间：2014-6-17 下午3:57:54 简单说明 */public final class JDBCUtil {private JDBCUtil(){}private static DataSource myDataSource = null;static {try {Properties properties = new Properties();InputStream is = JDBCUtil.class.getClassLoader().getResourceAsStream("dbcp.properties");properties.load(is);Class.forName(properties.getProperty("driverClassName"));myDataSource = BasicDataSourceFactory.createDataSource(properties);} catch (Exception e) {throw new ExceptionInInitializerError(e);}}public static DataSource getDataSource (){return myDataSource;}public static Connection getConnection () throws SQLException{return myDataSource.getConnection();}public static void free(ResultSet rs, Statement st, Connection conn) {try {if (rs != null)rs.close();} catch (SQLException e) {e.printStackTrace();} finally {try {if (st != null)st.close();} catch (SQLException e) {e.printStackTrace();} finally {if (conn != null)try {conn.close();} catch (SQLException e) {e.printStackTrace();}}}}}

使用方法

public User findUser(int id) {Connection conn = null;PreparedStatement ps = null;ResultSet rs = null;try {conn = JDBCUtil.getDataSource().getConnection();String sql = "select * from userinfo where id = ?";ps = conn.prepareStatement(sql);ps.setInt(1, id);rs = ps.executeQuery();User user = null;while(rs.next()){user = new User();user.setId(rs.getInt("id"));user.setName(rs.getString("name"));}return user;} catch (SQLException e) {e.printStackTrace();}finally{JDBCUtil.free(rs, ps, conn);}return null;}

源代码下载地址 http://download.csdn.net/detail/renlei0109/7526823

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