dbconnect.java

来自「一个由jsp+servlet+MySQL简单的新闻发布系统」· Java 代码 · 共 85 行

package com.news.util;

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

public class DBconnect {

	private static String driver = "com.mysql.jdbc.Driver";
	private static String url = "jdbc:mysql://localhost:3306/news?characterEncoding=utf8";
	private static String username = "root";
	private static String pasword = "admin";
	private static Connection conn = null;
	private static Statement stmt = null;
	private static PreparedStatement pstmt = null;

	public static void init() {
		try {
			Class.forName(driver);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		
	}

	public static Connection getConnection() throws ClassNotFoundException {
		init();
		try {
			conn = DriverManager.getConnection(url, username, pasword);
		} catch (SQLException e) {
			throw new RuntimeException(
					"Connect DataBase Failed,Please contact Administrator!");
		}
		return conn;
	}

	public static Statement getStatement() {
		try {
			stmt = getConnection().createStatement();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return stmt;
	}

	public static PreparedStatement getPreparedStatement(String sql) {
		try {
			pstmt = getConnection().prepareStatement(sql);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return pstmt;
	}

	public static void close() {
		if (stmt != null) {
			try {
				stmt.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		if (pstmt != null) {
			try {
				pstmt.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		if (conn != null) {
			try {
				conn.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

}