顶会热词统计3

Dbutil.java

package com.DBUtil;

import java.sql.*;

public class Dbutil {

    private static String url = "jdbc:mysql://localhost:3306/cloud?serverTimezone=UTC";
    private static String user = "root";
    private static String password = "liutianwen0613";
    private static String jdbcName="com.mysql.cj.jdbc.Driver";
    private Connection con=null;
    public static  Connection getConnection() {
        Connection con=null;
        try {
            Class.forName(jdbcName);
            con=DriverManager.getConnection(url, user, password);
            System.out.println("数据库连接成功");
        } catch (Exception e) {
            // TODO Auto-generated catch block
            System.out.println("数据库连接失败");
            e.printStackTrace();
        }
        try {
            con = DriverManager.getConnection(url,user,password);
            System.out.println("连接成功");


        } catch (SQLException e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        return con;
    }
    public static void close(Connection con) {
        if(con!=null)
            try {
                con.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

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

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