案例-用户注册

package com.itheima.web;

import com.itheima.pojo.User;
import com.itheima.service.UserService;

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 java.io.IOException;

@WebServlet("/registerServlet")
public class RegisterServlet extends HttpServlet {
    //获取UserService对象
    private UserService service=new UserService();

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1. 获取用户名和密码
        String username = request.getParameter("username");
        String password = request.getParameter("password");

        //2. 把获取到的数据封装成一个user对象
        User user = new User();
        user.setUsername(username);
        user.setPassword(password);

        //3. 调用service注册
        boolean flag = service.register(user);

        //4. 判断注册成功与否
        if (flag){
            //注册功能，跳转登录页面，设置属性值
            request.setAttribute("register_msg","注册成功，请登录");
            //跳转登录页面
            request.getRequestDispatcher("/login.jsp").forward(request,response);

        }else {
            //注册失败，跳转到注册页面
            //注册功能，跳转登录页面，设置属性值
            request.setAttribute("register_msg","用户名已被占用，请重新注册");
            //跳转登录页面
            request.getRequestDispatcher("/register.jsp").forward(request,response);
        }
    }

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

}