jdbc连接mysql

</pre><pre name="code" class="java">* jdbc连接mysql.
 */
import java.sql.*;

public class TestJdbc {
	
	public static void main(String[] args) {
		ResultSet rs = null;
		Statement stem = null;
		Connection conn = null;
		try {
		Class.forName("com.mysql.jdbc.Driver");//注册jdbc驱动
		conn = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/dw","root","root");
		//建立jdbc的连接url，username，password，
		stem = conn.createStatement();//创建一个声明语句
		rs = stem.executeQuery("select * from code_city ");//执行一个SQL语句。
		
		//对执行的结果进行遍历
		while(rs.next())
		{
			System.out.println(rs.getString("city_name"));
		}
		}catch (ClassNotFoundException e){
			System.out.println("Driver is error");
			e.printStackTrace();
		}catch (SQLException e) {
			System.out.println("Mysql is error");
			e.printStackTrace();
				
		}finally{
			try {
				//关闭调用的方法。
				if (rs != null)
				{
				rs.close();
				rs = null;
				}
				if (stem != null)
				{
				stem.close();
				stem =null;
				}
				if (conn != null)
				{
				conn.close();
				conn = null;
				}
			}catch (SQLException e){
				System.out.println("Mysql is error while close it");
				e.printStackTrace();
			}
		}		
		
	}

}