Java JDBC连接mysql数据库

 1 import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.mysql.jdbc.PreparedStatement;

public class DBTool {

    public static final  String DRIVER ="com.mysql.jdbc.Driver" ;    
    public static final  String URL = "jdbc:mysql://localhost:3306/数据库名";    
    public static final  String USERNAME = "用户名" ;    
    public static final  String PSW = "密码" ;    
    
    public static Connection getConn(){
        Connection conn = null;
        try {
            Class.forName(DRIVER);
            conn = DriverManager.getConnection(URL,USERNAME,PSW);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return conn;
    }
    //关闭资源
    public static void closeAll(ResultSet rs, PreparedStatement ps,Connection conn){
        if(rs!=null){
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(ps!=null){
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

}