Jdbc连接mySql数据库

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

public class ConnectionUtils {
    
    private static String url = "";
    private static String username = "";
    private static String password = "";
    
    static{
        try {
            String[] str = PropertyUtils.read("dbconn.properties");
            if(str != null && str.length>0){
              url = str[0];
              username = str[1];
              password = str[2];
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    /***
     * 得到连接
     * @return
     */
    public static Connection getConnection(){
        Connection conn = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(url, username, password);
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        return conn;
    
    }
    
    public static void closeConnection(Connection conn,Statement st,ResultSet rs){
        if(rs != null){
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(st != null){
           try {
            st.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }    
        }
        if(conn != null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    
    public static void main(String[]args){
        Connection con = ConnectionUtils.getConnection();
        System.out.println(con);
    }
}

import java.io.InputStream;
import java.util.Properties;

public class PropertyUtils {
    
    public static String[] read(String path) throws Exception{
        InputStream inStream = PropertyUtils.class.getClassLoader().getResourceAsStream(path);
        String[] str = new String[3];
        Properties prop = new Properties();
        prop.load(inStream);
        String url = (String) prop.get("jdbc.url");
        String username = (String)prop.get("jdbc.username");
        String password = (String)prop.get("jdbc.password");
        str[0] = url;
        str[1] = username;
        str[2]= password;
        return str;
    }

}