财务管理系统(2)项目eclips中连接数据库

jar包

连接数据库配置文件

 

创建DBUtil

package com.zyd.util;

import java.io.InputStream;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Properties;

public class DBUtil {
  /**
   * 得到数据库连接
   * @return
   */
  public static Connection getConnection(){
    Connection connection = null;

    try {
      //加载配置文件,字节输入流注入配置文件,路径在classpath下
      InputStream inputStream = DBUtil.class.getClassLoader().getResourceAsStream("db.properties");
      //得到属性文件
      Properties properties = new Properties();
      //将输入流加载到属性文件对象中,通过properties对象的load()方法
      properties.load(inputStream);
      //通过properties的getProperty()方法得到属性文件中的value
      String jdbcName = properties.getProperty("jdbcName");
      String url = properties.getProperty("url");
      String dbName = properties.getProperty("dbName");
      String dbPwd = properties.getProperty("dbPwd");
      //加载驱动
      Class.forName(jdbcName);
      //得到数据库连接
      connection = DriverManager.getConnection(url,dbName,dbPwd);
    } catch (Exception e) {
      e.printStackTrace();
    }
    return connection;
  }

  public static void close(ResultSet resultSet,PreparedStatement preparedStatement,Connection connection){
    //判断对象不为空,并关闭对象
    try {
      if (resultSet!= null) {
        resultSet.close();
      }
      if (preparedStatement !=null) {
        preparedStatement.close();
      }
      if (connection != null) {
        connection.close();
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  public static void main(String[] args) {
    Connection connection = DBUtil.getConnection();
    System.out.println(connection);
  }
}

连接成功