dbcp mysql关闭连接

import org.apache.commons.dbcp2.BasicDataSource;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBCPExample {
    private static BasicDataSource dataSource;

    static {
        dataSource = new BasicDataSource();
        dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/mydatabase");
        dataSource.setUsername("username");
        dataSource.setPassword("password");
        dataSource.setInitialSize(5);
        dataSource.setMaxTotal(20);
    }

    public static Connection getConnection() throws SQLException {
        return dataSource.getConnection();
    }

    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        try {
            conn = getConnection();
            stmt = conn.createStatement();
            rs = stmt.executeQuery("SELECT * FROM mytable");
            while (rs.next()) {
                // 处理结果集
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (rs != null) rs.close();
                if (stmt != null) stmt.close();
                if (conn != null) conn.close(); // 归还连接到连接池
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}