封裝DBUtils

package cn.gzsxt.util;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

public class DBUtil {

	private static String DRIVER = "";
	private static String URL = "";
	private static String USER = "";
	private static String PASSWORD = "";
	static {
		try {
			//以流的形式获取db.properties文件
			InputStream in = Thread.currentThread().getContextClassLoader().getResourceAsStream("db.properties");
			//创建Properties类，通过load将流读取到该对象中
			Properties prop = new Properties();
			prop.load(in);
			DRIVER = prop.getProperty("driver");
			URL = prop.getProperty("url");
			USER = prop.getProperty("user");
			PASSWORD = prop.getProperty("password");
			Class.forName(DRIVER);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
			System.out.println("配置文件读取失败");
		}
	}

	// 获取数据库连接
	public static Connection getConnection() {
		Connection conn = null;
		try {
			conn = DriverManager.getConnection(URL, USER, PASSWORD);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return conn;
	}

	public static void close(Connection conn, Statement ps) {
		if (ps != null) {
			try {
				ps.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		if (conn != null) {
			try {
				conn.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}

	public static void close(Connection conn, Statement ps, ResultSet rs) {
		if (rs != null) {
			try {
				rs.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		if (ps != null) {
			try {
				ps.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		if (conn != null) {
			try {
				conn.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}
}