本文实例讲述了JSP基于JDBC的数据库连接类。分享给大家供大家参考，具体如下：
/* * * TODO To change the template for this generated file go to * Window - Preferences - Java - Code Style - Code Templates */ package com.yanek.test; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.util.Enumeration; import java.util.Hashtable; import java.util.PropertyResourceBundle; import javax.naming.Context; import javax.naming.InitialContext; import javax.naming.NamingException; import javax.sql.DataSource; /** * @author Administrator * * TODO To change the template for this generated type comment go to Window - * Preferences - Java - Code Style - Code Templates */ public class Database { /** * 数据库访问URL */ private static String url; /** * 数据库驱动 */ private static String driver; /** * 数据库访问用户名 */ private static String username; /** * 数据库访问口令 */ private static String password; /** * 访问类型 */ private static String type; /** * 数据源名称 */ private static String datasource; /** * 配置文件名称 */ private final static String fileName = "database"; private static ThreadLocal connection = new ThreadLocal(); static { config(); } private static void config() { // 读取系统配置 PropertyResourceBundle resourceBundle = (PropertyResourceBundle) PropertyResourceBundle .getBundle(fileName); // 将系统设置赋值给类变量 Enumeration enu = resourceBundle.getKeys(); while (enu.hasMoreElements()) { String propertyName = enu.nextElement().toString(); if (propertyName.equals("database.url")) url = resourceBundle.getString("database.url"); if (propertyName.equals("database.driver")) driver = resourceBundle.getString("database.driver"); if (propertyName.equals("database.username")) username = resourceBundle.getString("database.username"); if (propertyName.equals("database.password")) password = resourceBundle.getString("database.password"); if (propertyName.equals("database.type")) type = resourceBundle.getString("database.type"); if (propertyName.equals("database.datasource")) datasource = resourceBundle.getString("database.datasource"); } } /** * 取得数据库连接 * * @return * @throws SQLException */ public synchronized static java.sql.Connection getConnection() throws SQLException { Connection con = (Connection) connection.get(); if (con != null && !con.isClosed()) { return con; } if ("pooled".equalsIgnoreCase(type)) { // 从JNDI中取得数据源 try { // 此处对于不同的应用服务器，对env传入不同 Hashtable env = new Hashtable(); // 此处对于不同的应用服务器，对env传入不同 Context ctx = new InitialContext(env); // 从命名系统中获取 DataSource // 工厂对象 DataSource dataSource = (DataSource) ctx.lookup(datasource); con = dataSource.getConnection(); connection.set(con); return con; } catch (NamingException e) { e.printStackTrace(); } } else { // 直接使用JDBC驱动连接 try { Class providerClass = Class.forName(driver); con = DriverManager.getConnection(url, username, password); con.setAutoCommit(false); connection.set(con); return con; } catch (ClassNotFoundException e) { e.printStackTrace(); } } return null; } public static void commit() { Connection con = (Connection) connection.get(); try { con.commit(); } catch (SQLException e) { e.printStackTrace(); } } public static void rollback() { Connection con = (Connection) connection.get(); try { con.rollback(); } catch (SQLException e) { e.printStackTrace(); } } public synchronized static void releaseConnection(Connection connection) { try { if (connection != null && !connection.isClosed()) connection.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } connection = null; } public static void main(String[] args) { try { System.out.println("conn:" + Database.getConnection()); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
database.property文件
复制代码 代码如下:database.driver=com.mysql.jdbc.Driver
database.url=jdbc:mysql://localhost/test?user=root&password=root&useUnicode=true&characterEncoding=gbk
希望本文所述对大家jsp程序设计有所帮助。
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