java jdbc_connection连接数据库代码

package org.marker.test;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class JdbcConnection {

/**
* @param args
*/
public static void main(String[] args) {
try
{
String url="jdbc:mysql://localhost:3306/iotp";
String user="root";
String pwd="1q2w";

//加载驱动，这一句也可写为：Class.forName("com.mysql.jdbc.Driver");
Class.forName("com.mysql.jdbc.Driver").newInstance();
//建立到MySQL的连接
Connection conn = DriverManager.getConnection(url,user, pwd);

//执行SQL语句
Statement stmt = conn.createStatement();//创建语句对象，用以执行sql语言
ResultSet rs = stmt.executeQuery("select * from t_comm_user");

//处理结果集
while (rs.next())
{
String name = rs.getString("USER_NAME_CN");
System.out.println(name);
}
rs.close();//关闭数据库
conn.close();
}
catch (Exception ex)
{
System.out.println("Error : " + ex.toString());
}

}

}