UserServlet页面抽取

package cn.itcast.travel.web.servlet;

import cn.itcast.travel.domain.ResultInfo;
import cn.itcast.travel.domain.User;
import cn.itcast.travel.service.UserServlce;
import cn.itcast.travel.service.impl.UserServlceImpl;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.commons.beanutils.BeanUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;

@WebServlet("/user/*")
public class UserServlet extends BaseServlet{
//   声明一个业务对象
    private UserServlce servlce = new UserServlceImpl();
    /**
     * 注册功能
     */
    public void regist(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException, InvocationTargetException, IllegalAccessException {
//        验证码校验
        String check = request.getParameter("check");
//        从sesion中获取验证吗
        HttpSession session = request.getSession();
        String server = (String) session.getAttribute("CHECKCODE_SERVER");
        session.removeAttribute("CHECKCODE_SERVER");//为了验证码只能使用一次
//        比较
        if (server==null||!server.equalsIgnoreCase(check)){
//          验证码错误
            ResultInfo info = new ResultInfo();
            //注册失败
            info.setFlag(false);
            info.setErrorMsg("验证码错误");
            //将info对象序列化为json
            ObjectMapper mapper = new ObjectMapper();
            String json = mapper.writeValueAsString(info);
            //将json数据写回客户端
            response.setContentType("application/json;charset=utf-8");
            response.getWriter().write(json);
            return;
        }

        //获取数据
        Map<String, String[]> map = request.getParameterMap();
        //封装对象
        User user = new User();
        BeanUtils.populate(user,map);
//        调用service完成注册
//        UserServlceImpl userService = new UserServlceImpl();
        boolean flag = servlce.regist(user);
        ResultInfo info = new ResultInfo();
        //响应结果
        if (flag) {
            //注册成功
            info.setFlag(true);

        } else {
            //注册失败
            info.setFlag(false);
            info.setErrorMsg("注册失败");
        }

        //将info对象序列化为json
        ObjectMapper mapper = new ObjectMapper();

        String json = mapper.writeValueAsString(info);

        //将json数据写回客户端
        response.setContentType("application/json;charset=utf-8");
        response.getWriter().write(json);
    }
    /**
     * 登录功能
     */
    public void login(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //        获取用户名称和密码
        Map<String, String[]> map = req.getParameterMap();
//        封装User对象
        User user = new User();
        try {
            BeanUtils.populate(user,map);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        } catch (InvocationTargetException e) {
            throw new RuntimeException(e);
        }
//       调用Service查询
//        UserServlce servlce = new UserServlceImpl();
        User u= servlce.login(user);
        ResultInfo info = new ResultInfo();
//       判断用户对象是后为null
        if (u==null){
            System.out.println("密码错误");
//       用户名和密码错误
            info.setFlag(false);
            info.setErrorMsg("用户密码错误");
        }
//       判断用户是否激活
        if (u!=null&&!"Y".equals(u.getStatus())){
//       用户尚未激活
            info.setFlag(false);
            info.setErrorMsg("您尚未激活，请激活..");
        }
//       判断登录成功
        if(u!=null&&"Y".equals(u.getStatus())){
            req.getSession().setAttribute("user",u);
            info.setFlag(true);
        }
//       响应数据
        ObjectMapper mapper = new ObjectMapper();

        resp.setContentType("application/json;charset=utf-8");
        mapper.writeValue(resp.getOutputStream(),info);

    }
    /**
     *查单个对象
     */
    public void findOne(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//      从session中获取登录用户
        Object user = req.getSession().getAttribute("user");
//      将user写回客户端
        ObjectMapper mapper = new ObjectMapper();
        resp.setContentType("application/json;charset=utf-8");
        mapper.writeValue(resp.getOutputStream(),user);
    }
    /**
     *退出
     */
    public void exit(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//      销毁session
        req.getSession().invalidate();
//      跳转页面
        resp.sendRedirect(req.getContextPath()+"login.html");
    }
    /**
     *激活功能
     */
    public void activea(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //        获取激活码
        String code = req.getParameter("code");
        if (code!=null){
//        调用servlet完成激活
//            UserServlce servlce = new UserServlceImpl();
            boolean b = servlce.active(code);

//         判断标记
            String msg = null;
            if (b){
                msg="激活成功,请<a href='login.html'>登录</a>";
            }else{
                msg="激活失败，请联系管理员";
            }
            resp.setContentType("text/html;charset=utf-8");
            resp.getWriter().write(msg);
        }
    }
}

分类数据展示功能_分析

　　图解：