连接MySql

package com.mysql.test;

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

public class MyfirstMysql {
 
     public static void main(String[] args) {
       
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        String name;
        String sex;
       
        try {
            Class.forName("com.mysql.jdbc.Driver").newInstance();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        try {
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/tests?user=root&password=root&useUnicode=true&characterEncoding=utf8");
            stmt = conn.createStatement();
            rs = stmt.executeQuery("select * from b");
        
         while(rs.next()) {
                name = rs.getString("sname");
                sex = rs.getString("ssex");
                System.out.print(name + "\t");
                System.out.println(sex);
         }
       
        /* String update = "insert into a values('人')";
         stmt.executeUpdate(update);
         rs = stmt.executeQuery("select * from a");
        
         while(rs.next()) {
             name = rs.getString("sname");
            System.out.println(name);
         }*/
        } catch (SQLException ex) {
         System.out.println("SQLException: " + ex.getMessage());
         System.out.println("SQLState: " + ex.getSQLState());
         System.out.println("VendorError: " + ex.getErrorCode());
        } finally {
            try {
                if(conn!=null)
                    conn.close();
                if(rs!=null)
                    rs.close();
                if(stmt!=null)
                    stmt.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
           
        }
    }
}