软工实习日记1

今天是软工实习的第一天, 主要的任务有进行JDBC的相关测试, 并且开始学习Spring框架的相关内容. 由于我有一段时间没有接触Java相关内容了, 所以先大致过了一遍关键点, 找了下感觉, 然后将JDBC连接测试完成, 下面会给出部分关键步骤

JDBC连接相关

版本:
jdk1.8.0_251
MySql 5.7.29
MySql Connector/ODBC 5.1.30

只给出部分关键代码

jdbc.properties

url=jdbc:mysql://localhost:3306/sqltest?useUnicode=true&characterEncoding=utf-8
user=root
password=123456
drive=com.mysql.jdbc.Driver

jdbc_test

import java.sql.*;
import java.util.Scanner;

/**
 * @Auther Jack
 * @Date 2020/7/20
 */
public class jdbc_test {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
     /*   Class.forName("com.mysql.jdbc.Driver");
        //获取数据库连接对象
        Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/sqltest?useUnicode=true&characterEncoding=utf-8","root","654321");
        String sql = "update jdbctable set name ='中文' where id = 2";
        Statement statement = connection.createStatement();
        int cout = statement.executeUpdate(sql);
        System.out.println(cout);
        statement.close();
        connection.close();*/
        Scanner sc =new Scanner(System.in);
        System.out.println("请输入用户名:");
        String username=sc.nextLine();
        System.out.println("请输入密码:");
        String password=sc.nextLine();
        boolean loginFlag = new jdbc_test().login(username,password);
        if(loginFlag){
            System.out.println("登录成功");
        }
        else {
            System.out.println("登录失败");
        }
    }
    public boolean login(String username ,String password){
        if(username==null||password==null){return false;}
        Connection connection=null;
        Statement statement=null;
        ResultSet resultSet =null;
        try {
            connection=JDBCUtils.getconnection();
            String sql = " select * from jdbctable where name='"+username+"' and password = '"+password+"'";
            statement=connection.createStatement();
            resultSet=statement.executeQuery(sql);
            return resultSet.next();

        } catch (SQLException e) {
           e.printStackTrace();
        }
        finally {JDBCUtils.close(resultSet,statement,connection);
    }
        return false;
    }
}

JDBCUtils

import com.sun.xml.internal.ws.addressing.WsaActionUtil;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.net.URL;
import java.sql.*;
import java.util.Properties;

/**
 * @Auther Jack
 * @Date 2020/7/20
 */
public class JDBCUtils {
    private static String url;
    private static String user;
    private static String password;
    private static String drive;
    static{
        try {
            Properties properties = new Properties();
            ClassLoader classLoader = JDBCUtils.class.getClassLoader();
            URL res = classLoader.getResource("jdbc.properties");
            String path = res.getPath();
            System.out.println(path);
            //加载文件
            properties.load(new FileReader(path));
            url = properties.getProperty("url");
            user = properties.getProperty("user");
            password = properties.getProperty("password");
            drive = properties.getProperty("drive");
            Class.forName(drive);
        }  catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }

    }
    public static Connection getconnection() throws SQLException {
        return DriverManager.getConnection(url,user,password);
    }
    public static void close(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();
            }
        }
    }

}

数据库内容

运行结果