MySQL官方网站下载：

1、MySQL-server-5.5.28-1.rhel4.i386.rpm

2、java驱动 mysql-connector-java-5.1.5-bin.jar

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测试服务器为Dell? E5410 的Debian linux 2.6，配置为：

1、4核，2.33GHz

2、内存3G

3、SATA硬盘2T

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web服务器：tomcat5.5

打压工具：Apache Bench

监控工具：mysqladmin

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测试思路：

1、使用自定义数据库连接池，最大连接数500；

2、每个请求做1000次插入；

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自定义连接池代码：DBConnectionManager

public class DBConnectionManager {
	static private DBConnectionManager instance; // 唯一实例
	static private int clients;

	private Vector drivers = new Vector();
	private PrintWriter log;
	private Hashtable pools = new Hashtable();

	/**
	 * 返回唯一实例.如果是第一次调用此方法,则创建实例
	 * 
	 * @return DBConnectionManager 唯一实例
	 */
	static synchronized public DBConnectionManager getInstance() {
		if (instance == null) {
			instance = new DBConnectionManager();
		}
		clients++;
		return instance;
	}

	/**
	 * 建构函数私有以防止其它对象创建本类实例
	 */
	private DBConnectionManager() {
		init();
	}

	/**
	 * 将连接对象返回给由名字指定的连接池
	 * 
	 * @param name
	 *            在属性文件中定义的连接池名字
	 * @param con
	 *            连接对象
	 */
	public void freeConnection(String name, Connection con) {
		DBConnectionPool pool = (DBConnectionPool) pools.get(name);
		if (pool != null) {
			pool.freeConnection(con);
		}
	}

	/**
	 * 获得一个可用的(空闲的)连接.如果没有可用连接,且已有连接数小于最大连接数 限制,则创建并返回新连接
	 * 
	 * @param name
	 *            在属性文件中定义的连接池名字
	 * @return Connection 可用连接或null
	 */
	public Connection getConnection(String name) {
		DBConnectionPool pool = (DBConnectionPool) pools.get(name);
		if (pool != null) {
			return pool.getConnection();
		}
		return null;
	}

	/**
	 * 关闭所有连接,撤销驱动程序的注册
	 */
	public synchronized void release() {
		// 等待直到最后一个客户程序调用
		if (--clients != 0) {
			return;
		}

		Enumeration allPools = pools.elements();
		while (allPools.hasMoreElements()) {
			DBConnectionPool pool = (DBConnectionPool) allPools.nextElement();
			pool.release();
		}
		Enumeration allDrivers = drivers.elements();
		while (allDrivers.hasMoreElements()) {
			Driver driver = (Driver) allDrivers.nextElement();
			try {
				DriverManager.deregisterDriver(driver);
				log("撤销JDBC驱动程序 " + driver.getClass().getName() + "的注册");
			} catch (SQLException e) {
				log(e, "无法撤销下列JDBC驱动程序的注册: " + driver.getClass().getName());
			}
		}
	}

	/**
	 * 根据指定属性创建连接池实例.
	 * 
	 * @param props
	 *            连接池属性
	 */
	private void createPools(Properties props) {
		Enumeration propNames = props.propertyNames();
		while (propNames.hasMoreElements()) {
			String name = (String) propNames.nextElement();
			if (name.endsWith(".url")) {
				String poolName = name.substring(0, name.lastIndexOf("."));
				String url = props.getProperty(poolName + ".url");
				if (url == null) {
					log("没有为连接池" + poolName + "指定URL");
					continue;
				}
				String user = props.getProperty(poolName + ".user");
				String password = props.getProperty(poolName + ".password");
				String maxconn = props.getProperty(poolName + ".maxconn", "0");
				int max;
				try {
					max = Integer.valueOf(maxconn).intValue();
				} catch (Exception e) {
					log("错误的最大连接数限制: " + maxconn + " .连接池: " + poolName);
					max = 0;
				}
				DBConnectionPool pool = new DBConnectionPool(poolName, url,
						user, password, max);
				pools.put(poolName, pool);
				log("成功创建连接池" + poolName);
			}
		}
	}

	/**
	 * 读取属性完成初始化
	 */
	private void init() {
		InputStream is = getClass().getResourceAsStream("/db.properties");
		Properties dbProps = new Properties();
		try {
			dbProps.load(is);
		} catch (Exception e) {
			System.err.println("不能读取属性文件. "
					+ "请确保db.properties在CLASSPATH指定的路径中");
			return;
		}
		String logFile = dbProps.getProperty("logfile",
				"DBConnectionManager.log");
		try {
			log = new PrintWriter(new FileWriter(logFile, true), true);
		} catch (IOException e) {
			System.err.println("无法打开日志文件: " + logFile);
			log = new PrintWriter(System.err);
		}
		loadDrivers(dbProps);
		createPools(dbProp