package com.qimh.mysql.datasource;import  java.sql.*;import javax.sql.DataSource;import  org.apache.commons.dbcp.BasicDataSource;
public class ConnectionPool{private static BasicDataSource dbs = null;public static DataSource setupDataSource(){
//        bds = new BasicDataSource();
//        //设置驱动程序
//        bds.sestDriverClassName("com.mysql.jdbc.Driver");
//        //设置连接用户名
//        bds.setUsername("root");
//        //设置连接密码
//        bds.setPassword("root");
//        //设置连接地址
//        bds.setUrl("jdbc:mysql://localhost:3306/databasename");
//        //设置初始化连接总数
//        bds.setInitialSize(50);
//        //设置同时应用的连接总数
//        bds.setMaxActive(-1);
//        //设置在缓冲池的最大连接数
//        bds.setMaxIdle(-1);
//        //设置在缓冲池的最小连接数
//        bds.setMinIdle(0);
//        //设置最长的等待时间
//        bds.setMaxWait(-1);
//        return (DataSource)bds;BasicDataSource ds = new BasicDataSource();ds.setDriverClassName("com.mysql.jdbc.Driver");ds.setUrl("jdbc:mysql://localhost:3306/ktv_demo7.5");ds.setUsername("root");ds.setPassword("123456");java.sql.Connection conn = null;/*** 最大活动连接数* 同时进行的数据库连接数不超过这个数目* */ds.setMaxActive(20);/*** 最大空闲连接数* 当释放数据库连接后,空闲连接数超过这个数目时关闭一些空闲连接*/ds.setMaxIdle(7);/*** 是否预编译SQL语句* */ds.setPoolPreparedStatements(true);try {conn = ds.getConnection();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println("最大活动连接数:"+ds.getMaxActive());System.out.println("最大空闲连接数:"+ds.getMaxIdle());return ds;}
//    //显示连接池的连接个数的方法
//    public static void printDataSourceStats(DataSource ds) throws SQLException{
//        bds = (BasicDataSource)ds;
//        System.out.println();
//        System.out.println();
//    }
//     //关闭连接池的方法
//     public static void shutdownDataSource(DataSource ds) throws SQLException{
//         bds = (BasicDataSource)ds;
//         bds.close();
//     }public static void main(String[] args) {ConnectionPool.setupDataSource();}}

参考链接：http://www.2cto.com/kf/201108/100523.html
jar 包链接：https://pan.baidu.com/s/1geBLrVl

其他参考代码：

package mysqlJDBC;import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;import org.apache.commons.dbcp.BasicDataSource;import com.housekeeper.myListener.services.Const;import shopping.ConnectionEcStore.WebUtils;
import shopping.util.MyProperties;public class MysqlJDBC {private static String dbip   = MyProperties.getPropertyValue(Const.UPLOAD_CONFIG, "ecstore.dbip"); private static String dbname = MyProperties.getPropertyValue(Const.UPLOAD_CONFIG, "ecstore.dbname"); private static Connection con = null; // 定义一个MYSQL链接对象private static BasicDataSource bds = null;public static void getMysqlConnection(){try {if(bds == null){String uname =  MyProperties.getPropertyValue(Const.UPLOAD_CONFIG, "ecstore.username"); String upass =  MyProperties.getPropertyValue(Const.UPLOAD_CONFIG, "ecstore.password"); bds = new BasicDataSource();bds.setUsername(uname);bds.setPassword(upass);bds.setDriverClassName("com.mysql.jdbc.Driver");bds.setUrl("jdbc:mysql://"+dbip+"/"+dbname+"?autoReconnect=true;characterEncoding=UTF-8");bds.setInitialSize(4);// 初始化连接数bds.setMinIdle(5);// 最小空闲数，防止当洪峰到来时，再次申请连接引起的 性能开销；bds.setMaxIdle(7);// 最大空闲数，放洪峰过后，连接池中的连接过多，bds.setMaxActive(10);// 最大连接数bds.setMaxWait(5000);// 最大等待时间5秒 ,设为-1表示无限期；}con = bds.getConnection(); // 获取连接System.out.println("yes");} catch (Exception e) {System.out.print("MYSQL ERROR:" + e.getMessage());}}public static List<Map<String, Object>> findDataList(String sql) {Statement stmt = null;ResultSet rs   = null;List<Map<String, Object>> datalist = new ArrayList<Map<String, Object>>();List<String> selectFieldList       = new ArrayList<String>();try {getMysqlConnection();stmt = con.createStatement();rs = stmt.executeQuery(sql);ResultSetMetaData rsmt = rs.getMetaData();for (int i = 1; i <= rsmt.getColumnCount(); i++) {selectFieldList.add(rsmt.getColumnLabel(i));}while (rs.next()) {Map<String, Object> valueMap = new HashMap<String, Object>();for (String columnLabel : selectFieldList) {valueMap.put(columnLabel, rs.getObject(columnLabel));}datalist.add(valueMap);}} catch (Exception ex) {ex.printStackTrace();} finally {try {if (rs != null) rs.close();if (stmt != null) stmt.close();if (con != null) con.close();} catch (SQLException e) {e.printStackTrace();}}return datalist;}public static Map<String, Object> findDataObject (String sql) {List<Map<String, Object>> rs = findDataList(sql);if (rs.size() > 0) {return rs.get(0);}return new HashMap<String, Object>();}/*** 查询方法* @param sql       查询语句* @param itemlist  列名list对象* @return*/public static List<Map<String,Object>> selectDataList(String sql,List<String> itemlist){Statement stmt = null; //创建声明List<Map<String,Object>> datalist = new ArrayList<Map<String,Object>>();try{getMysqlConnection();stmt = con.createStatement();ResultSet res = stmt.executeQuery(sql);while (res.next()) {Map<String,Object> map = new HashMap<String,Object>();for(int i=0;i<itemlist.size();i++){String item = itemlist.get(i);Object value = res.getObject(item);map.put(item, value);}datalist.add(map);}res.close();}catch(Exception ex){ex.printStackTrace();}finally{try{if(stmt != null)stmt.close();if(con != null)con.close();}catch(Exception ex){ex.printStackTrace();}}return datalist;}/*** 数据修改* @param sql* @return*/public static boolean insertUpdateDelData(String sql){Statement stmt = null; //创建声明boolean b = false;try{getMysqlConnection();stmt = con.createStatement();//新增一条数据int size = stmt.executeUpdate(sql);if(size > 0)b = true;}catch(Exception ex){ex.printStackTrace();}finally{try{if(stmt != null)stmt.cancel();if(con != null)con.close();}catch(Exception ex){ex.printStackTrace();}}return b;}/*** 添加数据* @param sql* @return*/public static boolean insertData(String tableName,Map<String,Object> map){boolean b = false;try{String sql = "INSERT INTO "+tableName+" ";String itemstr = "";String valuestr = "";int index = 0;for(Entry<String, Object> entry: map.entrySet()) {String key = entry.getKey();Object value = entry.getValue();if(value instanceof String){if(index == 0){itemstr = key;valuestr = "'"+value+"'";}else{itemstr = itemstr + "," +key;valuestr = valuestr + ",'"+value+"'";}}else if(value instanceof Integer || value instanceof Float || value instanceof Double || value instanceof Long){if(index == 0){itemstr = key;valuestr = ""+value+"";}else{itemstr = itemstr + "," +key;valuestr = valuestr + ",'"+value+"'";}}else if(value instanceof Boolean){if(index == 0){itemstr = key;valuestr = "'"+value+"'";}else{itemstr = itemstr + "," +key;valuestr = valuestr + ",'"+value+"'";}} else {if(index == 0) {itemstr = key;valuestr = "'"+value+"'";} else {itemstr = itemstr + "," +key;valuestr = valuestr + ",'"+value+"'";}}index++;}sql = sql + "("+itemstr+") VALUES ("+valuestr+")";b = insertUpdateDelData(sql);}catch(Exception ex){ex.printStackTrace();}return b;}/*** 更新数据* @param tableName 要更新的表名* @param map       需要更新的字段值* @param wheremap  更新需要的条件* @return*/public static boolean updateData(String tableName,Map<String,Object> map,Map<String,Object> wheremap){boolean b = false;try{String sql = "UPDATE "+tableName+" SET ";String itemstr = "";String wherestr = "";int index = 0;for(Entry<String, Object> entry: map.entrySet()) {String key = entry.getKey();Object value = entry.getValue();if(value instanceof String){if(index == 0){itemstr = key + " = '"+value+"'";}else{itemstr = itemstr + "," +key  + " = '"+value+"'";}}else if(value instanceof Integer || value instanceof Float || value instanceof Double){if(index == 0){itemstr = key + " = "+value+"";}else{itemstr = itemstr + "," +key  + " = "+value+"";}}else if(value instanceof Boolean){if(index == 0){itemstr = key + " = '"+value+"'";}else{itemstr = itemstr + "," +key  + " = '"+value+"'";}}index++;}index = 0;for(Entry<String, Object> entry: wheremap.entrySet()) {String key = entry.getKey();Object value = entry.getValue();if(value instanceof String){if(index == 0){wherestr = key + " = '"+value+"'";}else{wherestr = wherestr + " and " +key  + " = '"+value+"'";}}else if(value instanceof Integer || value instanceof Float || value instanceof Double){if(index == 0){wherestr = key + " = "+value+"";}else{wherestr = wherestr + " and " +key  + " = "+value+"";}}else if(value instanceof Boolean){if(index == 0){wherestr = key + " = '"+value+"'";}else{wherestr = wherestr + " and " +key  + " = '"+value+"'";}}index++;}sql = sql + itemstr + " where " + wherestr;b = insertUpdateDelData(sql);}catch(Exception ex){ex.printStackTrace();}return b;}/*** 删除数据* @param tableName  要删除的表名* @param wheremap   需要删除的条件* @return*/public static boolean deleteData(String tableName,Map<String,Object> wheremap){boolean b = false;try{String sql = "DELETE FROM "+tableName+" ";String wherestr = "";int index = 0;for(Entry<String, Object> entry: wheremap.entrySet()) {String key = entry.getKey();Object value = entry.getValue();if(value instanceof String){if(index == 0){wherestr = key + " = '"+value+"'";}else{wherestr = wherestr + " and " +key  + " = '"+value+"'";}}else if(value instanceof Integer || value instanceof Float || value instanceof Double){if(index == 0){wherestr = key + " = "+value+"";}else{wherestr = wherestr + " and " +key  + " = "+value+"";}}else if(value instanceof Boolean){if(index == 0){wherestr = key + " = '"+value+"'";}else{wherestr = wherestr + " and " +key  + " = '"+value+"'";}}index++;}sql = sql + " where " + wherestr;b = insertUpdateDelData(sql);}catch(Exception ex){ex.printStackTrace();}return b;}public static void main(String arg[]) {String sql = "select max(member_id) as mid from sdb_pam_members";List<String> itemlist = new ArrayList<String>();itemlist.add("mid");
//      itemlist.add("shipping");
//      itemlist.add("ship_name");
//      itemlist.add("ship_time");
//      itemlist.add("total_amount");List<Map<String,Object>> dlist = selectDataList(sql,itemlist);
//      for(int i=0;i<dlist.size();i++)
//      {Map<String,Object> map3 = dlist.get(0);System.out.println(map3.toString());long mid = ((Long)map3.get("mid")+1);//      }Date date = new Date();String time = String.valueOf(date.getTime());time = time.substring(0,time.length()-3);Map<String,Object> map = new HashMap<String,Object>();map.put("member_id", mid);map.put("member_lv_id", 1);map.put("sex", "2");map.put("email", "yinliang@htomail.com");map.put("reg_ip", "15.12.11.1");map.put("regtime", time);map.put("cur", "CNY");map.put("member_refer", "local");map.put("source", "api");boolean b = insertData("sdb_b2c_members",map);System.out.println(b);String s = WebUtils.extends_md5("222222","yinl88",time);Map<String,Object> map2 = new HashMap<String,Object>();map2.put("member_id", mid);map2.put("login_password", s);map2.put("login_account", "yinl88");map2.put("login_type", "local");map2.put("password_account", "yinl88");map2.put("disabled", "false");map2.put("createtime", time);boolean b2 = insertData("sdb_pam_members",map2);System.out.println(b2);//     Map<String,Object> map2 = new HashMap<String,Object>();
//      map2.put("shipping", "test1111");
//      map2.put("ship_name", "test21111");
//      map2.put("ship_time", "test211111");
//      map2.put("total_amount", 60.00);
//
//      Map<String,Object> wheremap = new HashMap<String,Object>();
//      wheremap.put("order_id", "1200333");
//
//      boolean b2 = updateData("sdb_b2c_orders",map2,wheremap);
//      System.out.println(b2);//       Map<String,Object> wheremap = new HashMap<String,Object>();
//      wheremap.put("order_id", "1200303222");
//
//      boolean b2 = deleteData("sdb_b2c_orders",wheremap);
//      System.out.println(b2);}
}

读取properties 属性文件的工具类

package shopping.util;import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;public class MyProperties {public static String getPropertyValue (String path, String key) {Properties props = new Properties();try {InputStream in = new FileInputStream(new File(path).getCanonicalPath());try {props.load(in);} catch (IOException e) {e.printStackTrace();}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return props.getProperty(key);}public static void main(String[] args) {String val = getPropertyValue("hot-deploy/ktv_demo/webapp/config/customize.properties", "mail.server.host");System.out.println(val);}
}