IDEA中使用properties连接mysql8.0.13

1.IDEA下导入mysql-connector-java-8.0.13.jar,并添加到Modules中

2.在项目下新建一个目录(Directory)，一般properties文件夹命名应为resoures

3.右键新建的resources文件夹，选择Mark Dictory as >>Resources Root将文件夹定义为配置文件夹

4.右键resources类型的文件夹选择Resource Bundle，就能创建properties文件了

5.mysql8.0.13的properties文件内容为：

注意：配置文件是以键值对形式来进行存/读取的，一个对象占用一行，行末不能添加分号

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/goods?useSSL=false&serverTimezone=UTC
username=root
password=123456

6.properties使用的静态代码块有两种:

第一种：Properties

public static String driver;public static String url;public static String username;public static String password;static {Properties pt = new Properties();try{FileInputStream in = new FileInputStream("resources/db.properties");pt.load(in);driver = pt.getProperty("driver");url = pt.getProperty("url");username = pt.getProperty("username");password = pt.getProperty("password");}catch (IOException e){e.printStackTrace();}}

public static String driver;public static String url;public static String username;public static String password;static {try{ClassLoader classLoader = JDBCUtils.class.getClassLoader();InputStream is = classLoader.getResourceAsStream("db.properties");Properties pt = new Properties();pt.load(is);driver = pt.getProperty("driver");url = pt.getProperty("url");username = pt.getProperty("username");password = pt.getProperty("password");}catch (IOException e){e.printStackTrace();}}

第二种：ResourceBundle

private static String driver;private static String url;private static String username;private static String password;static{ResourceBundle bundle = ResourceBundle.getBundle("db");driver = bundle.getString("driver");url = bundle.getString("url");username = bundle.getString("username");password = bundle.getString("password");}

7.具体测试代码：

JDBCUtils.java

package pers.wpc.jdbc;import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;
import java.util.ResourceBundle;public class JDBCUtils {public static String driver;public static String url;public static String username;public static String password;static {Properties pt = new Properties();try{FileInputStream in = new FileInputStream("resources/db.properties");pt.load(in);driver = pt.getProperty("driver");url = pt.getProperty("url");username = pt.getProperty("username");password = pt.getProperty("password");}catch (IOException e){e.printStackTrace();}}/***Propertiespublic static String driver;public static String url;public static String username;public static String password;static {try{ClassLoader classLoader = JDBCUtils.class.getClassLoader();InputStream is = classLoader.getResourceAsStream("db.properties");Properties pt = new Properties();pt.load(is);driver = pt.getProperty("driver");url = pt.getProperty("url");username = pt.getProperty("username");password = pt.getProperty("password");}catch (IOException e){e.printStackTrace();}}*//***ResourceBundleprivate static String driver;private static String url;private static String username;private static String password;static{ResourceBundle bundle = ResourceBundle.getBundle("db");driver = bundle.getString("driver");url = bundle.getString("url");username = bundle.getString("username");password = bundle.getString("password");}*/public static Connection getConnection(){Connection conn = null;try {Class.forName(driver);conn= DriverManager.getConnection(url,username,password);}catch (Exception e){e.printStackTrace();}return conn;}public static void release(Connection conn, PreparedStatement pstmt, ResultSet rs){if (rs!=null){try {rs.close();}catch (SQLException e){e.printStackTrace();}}if (pstmt!=null){try {pstmt.close();}catch (SQLException e){e.printStackTrace();}}if (conn!=null){try {conn.close();}catch (SQLException e){e.printStackTrace();}}}
}

TestUtils.java

package pers.wpc.jdbc;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class TestUtils {public static void main(String[] args) {Connection conn=null;PreparedStatement pstmt=null;ResultSet rs=null;try {conn =JDBCUtils.getConnection();String sql = "select * from t_book where bid=?";pstmt = conn.prepareStatement(sql);pstmt.setInt(1,2);rs = pstmt.executeQuery();while (rs.next()){System.out.print(rs.getString(2)+"----"+rs.getString("author"));}}catch (SQLException e){e.printStackTrace();} finally {JDBCUtils.release(conn,pstmt,rs);}}
}

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IDEA中使用properties连接mysql8.0.13

IDEA中使用properties连接mysql8.0.13

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