java基于jdbc实现简单学生管理系统

package Student;


import java.io.IOException;
import java.sql.*;
import java.util.Properties;
 

//数据库的工具类
public class JDBCuntils {
 
    private static String driver = "";
    private static String url = "";
    private static String user = "";
    private static String password = "";

    static {
        Properties p = new Properties();
        try {
            p.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("db.properties"));
        } catch (IOException e) {
            e.printStackTrace();
        }
        driver = p.getProperty("driver");
        url = p.getProperty("url");
        user = p.getProperty("user");
        password = p.getProperty("password");
        /*try {
            Class.forName(driver);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }*/
    }
 
    public static Connection getConnection() {
        try {
            return DriverManager.getConnection(url, user, password);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
    //释放的时候要从小到大释放
    //Connection -> Statement --> Resultset
 
 
    public static void release(ResultSet rs, Statement stmt, Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (stmt != null) {
            try {
                stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
 
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
      <mark style="color:transparent">本文来源gaodaimacom搞#^代%!码&网*</mark>      }
        }
    }
}

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/db3
user=root
password=1767737316.
#<!-- \u914D\u7F6E\u521D\u59CB\u5316\u5927\u5C0F -->
initialSize=6
#<!-- \u914D\u7F6E\u521D\u59CB\u5316\u6700\u5927\u8FDE\u63A5\u6570 -->
maxActive=20
#<!-- \u914D\u7F6E\u521D\u59CB\u5316\u6700\u5C0F\u8FDE\u63A5\u6570 -->
minIdle=3
#<!-- \u914D\u7F6E\u83B7\u53D6\u8FDE\u63A5\u7B49\u5F85\u8D85\u65F6\u7684\u65F6\u95F4,1\u5206\u949F\u5355\u4F4D\u6BEB\u79D2 -->
maxWait=60000

package Student;

import java.util.Date;
public class Student {
       private int id;
       private String name;
       private int score;
       public Student(int id, String name,int score) {

            this.id = id;
            this.name = name;
            this.score = score;
        }

        public Student() {

        }
        public String toString() {
            return "Student{" +
                    "name='" + id + '\'' +
                    ", age=" + name +
                    ", sex='" + score + '\'' +
                    '}';
        }
    public int getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getScore() {
        return score;
    }
    public void setScore(Integer score) {
        this.score = score;
    }  
}