关于web层代码

BaseServlet
package com.cwk.web.listener.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**

• 替换HttpServlet 根据请求最后一段路径 进行分发
  */
  public class BaseServlet extends HttpServlet {
  //根据路径进行方法分发
  @Override
  protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  //1.获取请求路径
  String requestURI = req.getRequestURI();//brand-case/brand/selectAll
  //2.获取最后一段路径 方法名
  String methodName = requestURI.substring(requestURI.lastIndexOf('/') + 1);

   //2.执行方法
   //2.1获取BrandServlet/UserServlet的字节码对象 字节码对象Class
   Class<? extends BaseServlet> aClass = this.getClass();
  
   try {
       Method method = aClass.getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
       //执行方法
       method.invoke(this,req,resp);
   } catch (NoSuchMethodException e) {
       throw new RuntimeException(e);
   } catch (InvocationTargetException e) {
       throw new RuntimeException(e);
   } catch (IllegalAccessException e) {
       throw new RuntimeException(e);
   }
  

  }
  }

登录servlet

package com.cwk.web.listener.servlet;

import com.cwk.pojo.User;
import com.cwk.service.UserService;
import com.cwk.service.impl.UserServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {
UserService userService = new UserServiceImpl();

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    HttpSession session = req.getSession();

    //接收数据
    String username = req.getParameter("username");
    String password = req.getParameter("password");
    User user = userService.login(username, password);
    String contextPath = req.getContextPath();
    //存Session

    session.setAttribute("user", user);
    session.setAttribute("username", username);
    //到时候解封即可
   /* if (user != null) {
        if (user.判断职位之类的.equals("1")) {
            resp.sendRedirect(contextPath + "/generalStaff.jsp");
        } else if (user.判断职位之类的().equals("2")) {
            resp.sendRedirect(contextPath + "/DepartmentManager.jsp");
        } else if (user.判断职位之类的().equals("3")) {
            resp.sendRedirect(contextPath + "/GeneralManager.jsp");
        } else if (user.判断职位之类的().equals("4")) {
            resp.sendRedirect(contextPath + "/FinanceStaff.jsp");
        } else {
            System.out.println("数据非法！");
        }


    }
    else {
        System.out.println("nihao");
        //登陆失败
        //存储错误信息
        req.setAttribute("login_msg", "用户名或密码错误");
        //跳转
        req.getRequestDispatcher("/index.jsp").forward(req, resp);
    }

*/

}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    this.doGet(req, resp);
}

}