a) SqlSession对象要使用同一个factory对象创建 b) 一次请求内共享同一个SqlSession对象 c) 需要注意：用到ThreadLocal对象来存储SqlSession对象 i. ThreadLocal对象中存储的数据只能在同一个线程中获取 ii. 在某个线程中存储的，必须在该线程中获取，就算另一个线程中获取到了同一个ThreadLocal对象，也无法获取到其中存储的其他线程的数据 d) private static ThreadLocal threadLocal = new ThreadLocal<>();
public class BaseServlet extends HttpServlet { @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //设置编码格式 req.setCharacterEncoding("utf-8"); resp.setCharacterEncoding("utf-8"); //获取请求中的方法 String methodName = req.getParameter("methodName"); Class clazz = this.getClass(); //判断 try { Method method = clazz.getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class); method.invoke(this,req,resp); } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) { e.printStackTrace(); } } }