databaseconnection.java

一个jsp+javabean实例的简单应用

package com.jspdev.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DataBaseConnection {
	/**
	 * 一个静态方法，返回一个数据库的连接
	 */
	public static Connection getConnection() {
		Connection con = null;
		String CLASSFORNAME = "com.mysql.jdbc.Driver";
		String SERVANDDB = "jdbc:mysql://localhost:3306/jspdev";
		String USER = "root";
		String PWD = "123";
		try {
			Class.forName(CLASSFORNAME);
			con = DriverManager.getConnection(SERVANDDB,USER,PWD);
		} catch(Exception e) {
			e.printStackTrace();
		}
		return con;
	}
	
	public static void main(String[] args) throws SQLException {
		Connection con = DataBaseConnection.getConnection();
		Statement stmt = null;
		try {
			stmt = con.createStatement();
		} catch (SQLException e) {
			e.printStackTrace();
		}	
		//stmt.execute("insert into contact values ('127',123,'123','123','2008-01-22','123')");
		ResultSet rs = stmt.executeQuery("select * from contact"); 
		while(rs.next()) {
			System.out.println(rs.getString("userName"));
		}
	}
}