java连接MySQL数据库

import java.sql.*;
public class Demo {
public static void main(String[] args){
Connection conn = null;
Statement statement = null;
ResultSet resultSet = null;

final String PASSWORD = "6855639";
final String USER = "root";
final String PROTOCOL = "jdbc:mysql://localhost:3306/qsuron";
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(PROTOCOL,USER,PASSWORD);
statement = conn.createStatement();
resultSet = statement.executeQuery("select * from account");
while(resultSet.next()){
System.out.println(resultSet.getString("id"));
}
} catch (ClassNotFoundException e) {
System.out.println("找不到相应的类!");
} catch (SQLException e) {
System.out.println("连接数据库出错!");
} finally{
try{
if(resultSet != null){
resultSet.close();
resultSet = null;
}
if(statement != null){
statement.close();
statement = null;
}
if(conn != null){
conn.close();
conn = null;
}
} catch(SQLException e){
e.printStackTrace();
}
}
}
}