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JSPasp实例教程:JDBC的数据库连接类实例

来源:中文源码网    浏览: 次    日期:2018年8月31日
【下载技术文档:  JSPasp实例教程:JDBC的数据库连接类实例 】


JSP基于JDBC的数据库连接类实例 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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