1, download JDBC driver
SQLJDBC - Microsoft official website download link

spare:Baidu network disk link：
Extraction code: 2INU
(Version 8.4, support JDK8, JDK11, JDK14)

2, open the downloaded driver file
Figure:

According to your ownJDK versionDifferent.jarFile, because my JDK version is 14, so choosemssql-jdbc-8.4.1-jre14.jarTo copy it into the Java project, it is best to put it in a folder.

3, configure the JDBC driver
(IneclipseTake an example)

Select the JDBC driver file in the Java project.Right keyChoice–Build Path --Add to Build Path, ThenReferenced LibrariesYou can see the driver, indicating that the configuration is successful:

4, Java connection SQL Server databaseCode

import java.sql.*;

public class Linkdb {
	
	private String dbUrl="JDBC: SQLServer: // localhost: 1433; DatabaseName = Your database name";// Database connection address
	private String dbUserName="sa"; //username
	private String dbPassword="123456"; //password
	private String jdbcName="com.microsoft.sqlserver.jdbc.SQLServerDriver"; // Drive name
	
	/**
	  * Get database connections
	 * @return
	 */
	public Connection getCon() throws Exception{
		Class.forName(jdbcName);
		Connection con=DriverManager.getConnection(dbUrl, dbUserName, dbPassword);
		return con;
	}
	
	/**
	  * Turn off the database connection
	 * @param con
	 * @throws Exception
	 */
	public void closeCon(Connection con)throws Exception{
		if(con!=null) {
			con.close();
		}
	}
	
	public static void main(String[] args) {
		Linkdb dbUtil=new Linkdb();
		try {
			Connection con = dbUtil.getCon();
			System.out.println("Database connection success");
			Statement stmt = con.createStatement();
			stmt.close();
			dbUtil.closeCon(con);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			System.out.println("Database connection failed");
		}
		
	}

	public static ResultSet Query(String sql) throws SQLException {
		Linkdb dbUtil=new Linkdb();
		// TODO Auto-generated method stub
		Connection con;
		ResultSet rs = null;
		try {
			con = dbUtil.getCon();
			Statement stmt = con.createStatement();
			//Inquire
			rs = stmt.executeQuery(sql);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			System.out.println("Database query failed");
		}
		return rs;
	}

	public static void Update(String sql) {
		// TODO Auto-generated method stub
		Linkdb dbUtil=new Linkdb();
		// TODO Auto-generated method stub
		Connection con;
		ResultSet rs = null;
		try {
			con = dbUtil.getCon();
			Statement stmt = con.createStatement();
			//insert
			stmt.executeUpdate(sql);
			
			stmt.close();
			dbUtil.closeCon(con);
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			System.out.println("Database update failed");
		}
	}
}

Note: DatabaseName fills in your own database name.
The QUERY method performs a method for SQL query statements, as long as the SQL statement of the String type is passed.
The UPDATE method performs methods for SQL update statements, including Update, Insert, Delete.