[util]-[JDBC]-[JdbcUtil]

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

public class JdbcUtil {

	private static String db_driver;
	private static String db_url;
	private static String db_userName;
	private static String db_passWord;
	static{
		Properties pro = new Properties();
		try {    
                           //配置文件在项目的src目录下
			pro.load(new FileInputStream((JdbcUtil.class.getResource("/").getPath()+"/jdbc.properties")));
			
		} catch (FileNotFoundException e) {
			System.out.println("1-FileNotFoundException");
			e.printStackTrace();
		} catch (IOException e) {
			System.out.println("2-IOException");
			e.printStackTrace();
		}
		db_driver = pro.getProperty("db_driver");
		db_url = pro.getProperty("db_url");
		db_userName = pro.getProperty("db_userName");
		db_passWord = pro.getProperty("db_passWord");
	}
	//获得连接
	public static Connection getConnection(){
		Connection con=null;
		//1.加载oracle驱动
		try {
			Class.forName(db_driver);
		} catch (ClassNotFoundException e) {
			//写日志
			System.out.println("3-ClassNotFoundException");
			e.printStackTrace();
			return null;
		}
		//2.获得数据库连接
		try {
			con=DriverManager.getConnection(db_url,db_userName,db_passWord);
		} catch (SQLException e) {
			//写日志
			System.out.println("4-SQLException");
			e.printStackTrace();
			return null;
		}
			return con;
	}
	
	//关闭数据库资源
	public static void close(Connection con,Statement stmt,ResultSet rs){
		if(rs!=null){
			try {
				rs.close();
			} catch (SQLException e) {
				//写日志
				System.out.println("5--SQLException");
				e.printStackTrace();
			}
		}
		if(stmt!=null){
			try {
				stmt.close();
			} catch (SQLException e) {
				//日志
				System.out.println("6-SQLException");
				e.printStackTrace();
			}
		}
		if(con!=null){
			try {
				con.close();
			} catch (SQLException e) {
				//日志
				System.out.println("7-closeSQLException");
				e.printStackTrace();
			}
		}
	}
	
	//关闭数据库资源
	public static void close(Connection con,PreparedStatement pstmt,ResultSet rs){
		if(rs!=null){
			try {
				rs.close();
			} catch (SQLException e) {
				//写日志
				System.out.println("8-SQLException");
				e.printStackTrace();
			}
		}
		if(pstmt!=null){
			try {
				pstmt.close();
			} catch (SQLException e) {
				//日志
				System.out.println("9-SQLException");
				e.printStackTrace();
			}
		}
		if(con!=null){
			try {
				con.close();
			} catch (SQLException e) {
				//日志
				System.out.println("10-closeSQLException");
				e.printStackTrace();
			}
		}
	}
	
	//关闭数据库资源
	public static void close(Connection con){
		if(con!=null){
			try {
				con.close();
			} catch (SQLException e) {
				//日志
				System.out.println("11-closeSQLException");
				e.printStackTrace();
			}
		}
	}
}

jdbc.properties

db_driver=oracle.jdbc.driver.OracleDriver
db_url=jdbc:oracle:thin:@*.*.*.*:1521:*
db_userName=*
db_passWord=*