public class JDBC{
public static void main(String[] args)
{
//查询数据
selectData();
}

//查询数据的方法
private static selectData()
{
try{
//连接
Connection conn = null;
//statement 
Statement stmt = null;
//Result结果集
ResultSet rs = null;

//1.创建并注册驱动
Class.forName("com.mysql.jdbc.Driver");

//2.创建连接
DriverManager.getConnection("jdbc:mysql://localhost:3306/game","root","root");

//3.定义sql
String sql = "select * from tb_user";

//4.statement对象
stmt = conn.createStatement();

//5.执行sql
rs=stmt.executeQuery(sql);

//6.遍历结果集
while(rs.next()){
int id = rs.getInt("id");
String loginName = rs.getString("login_name");
String password = rs.getString("password");
System.out.println("id:"+id+" loginName:"+loginName+" password:"+password);

}
} catch (Exception e){
}finally{
//关闭记录集
if(rs !=null)
{
try{
rs.close();
} catch (SQLException e){
e.printStackTrace();
}
}

//statement对象
if(stmt !=null)
{
try{
stmt.close();
} catch (SQLException e){
e.printStackTrace();
}
}

//关闭连接
if(conn !=null)
{
try{
conn.close();
} catch (SQLException e){
e.printStackTrace();
}
}
}
}
}

Java JDBC使用方法