public class ConnectionManager {

    public static ComboPooledDataSource dataSource;
    static {
        try {
            dataSource = new ComboPooledDataSource();
            dataSource.setUser("freeswitch");
            dataSource.setPassword("freeswitch");
            dataSource.setJdbcUrl("jdbc:postgresql://数据库地址:数据库端口/freeswitch");
            dataSource.setDriverClass("org.postgresql.Driver");
            dataSource.setInitialPoolSize(10);
            dataSource.setMinPoolSize(5);
            dataSource.setMaxPoolSize(50);
            dataSource.setMaxStatements(100);
            dataSource.setMaxIdleTime(60);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static Connection getConnection3() {
        Connection conn = null;
        if (null != dataSource) {
            try {
                conn = dataSource.getConnection();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        return conn;
    }
}

public class DataBaseHelper {

    // 保证一个线程一个Connection，线程安全
    private static final ThreadLocal<Connection> connHolder;
    // 线程池
    private static final BasicDataSource dataSource;
    static {
        connHolder = new ThreadLocal<Connection>();
        dataSource = new BasicDataSource();
        dataSource.setDriverClassName("org.postgresql.Driver");
        dataSource.setUrl("jdbc:postgresql://数据库地址:数据库端口/freeswitch");
        dataSource.setUsername("freeswitch");
        dataSource.setPassword("freeswitch");
        /// 设置空闲和借用的连接的最大总数量，同时可以激活。
        dataSource.setMaxTotal(60);
        // 设置初始大小
        dataSource.setInitialSize(5);
        // 最小空闲连接
        dataSource.setMinIdle(8);
        // 最大空闲连接
        dataSource.setMaxIdle(16);
        // 超时等待时间毫秒
        dataSource.setMaxWaitMillis(2 * 10000);
        // 只会发现当前连接失效，再创建一个连接供当前查询使用
        dataSource.setTestOnBorrow(true);
        // removeAbandonedTimeout ：超过时间限制，回收没有用(废弃)的连接（默认为 300秒，调整为180）
        dataSource.setRemoveAbandonedTimeout(180);
        // removeAbandoned ：超过removeAbandonedTimeout时间后，是否进
        // 行没用连接（废弃）的回收（默认为false，调整为true)
        // DATA_SOURCE.setRemoveAbandonedOnMaintenance(removeAbandonedOnMaintenance);
        dataSource.setRemoveAbandonedOnBorrow(true);
        // testWhileIdle
        dataSource.setTestOnReturn(true);
        // testOnReturn
        dataSource.setTestOnReturn(true);
        // setRemoveAbandonedOnMaintenance
        dataSource.setRemoveAbandonedOnMaintenance(true);
        // 记录日志
        dataSource.setLogAbandoned(true);
        // 设置自动提交
        dataSource.setDefaultAutoCommit(true);

    }

    /**
     * 获取数据库连接
     */
    public static Connection getConnection() {
        Connection conn = connHolder.get();
        if (conn == null) {
            try {
                conn = dataSource.getConnection();
                System.out.println("get connection success");
            } catch (SQLException e) {
                System.out.println("get connection failure:" + e);
            } finally {
                connHolder.set(conn);
            }
        }
        return conn;
    }

    /**
     * 关闭数据库连接
     */
    public static void closeConnection() {
        Connection conn = connHolder.get();
        if (conn != null) {
            try {
                conn.close();
                System.out.println("close connection success");
            } catch (SQLException e) {
                System.out.println("close connection failure:" + e);
                throw new RuntimeException(e);
            } finally {
                connHolder.remove();
            }
        }
    }

}