【MySQL】JavaWeb项目中配置数据库的连接池

在META-INF目录下新建context.xml

<?xml version="1.0" encoding="UTF-8"?>
<Context><Resource name="jdbc/TestDB" auth="Container" type="javax.sql.DataSource"maxActive="10" maxIdle="4"username="root" password="" driverClassName="com.mysql.jdbc.Driver"url="jdbc:mysql://localhost:3306/库名" />
</Context>

在DAO中获取连接实例

    public static Connection getConnect(){Context initContext;Context envContext;Connection con = null;try {initContext = new InitialContext();envContext = (Context) initContext.lookup("java:/comp/env");DataSource ds = (DataSource) envContext.lookup("jdbc/PriceDB");con = ds.getConnection();System.out.println("数据库连接成功");} catch (NamingException e) {// TODO Auto-generated catch block
            e.printStackTrace();} catch (SQLException e) {// TODO Auto-generated catch block
            e.printStackTrace();}return con;}