src/main/java/com/hwua/erhai/controller/DoUserDeleteServlet.java

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package com.hwua.erhai.controller;

import com.alibaba.fastjson.JSONObject;
import com.hwua.erhai.dao.ICarDao;
import com.hwua.erhai.dao.IUserDao;
import com.hwua.erhai.dao.impl.CarDaoImpl;
import com.hwua.erhai.dao.impl.UserDaoImpl;
import com.hwua.erhai.entity.Car;
import com.hwua.erhai.entity.User;
import com.hwua.erhai.service.ICarService;
import com.hwua.erhai.service.IUserService;
import com.hwua.erhai.service.impl.MockCarService;
import com.hwua.erhai.service.impl.MockUserService;
import com.hwua.erhai.vo.DoCarDeleteResponse;
import com.hwua.erhai.vo.DoUserDeleteResponse;
import org.apache.commons.lang3.StringUtils;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;

@WebServlet(name = "DoUserDeleteServlet", value = "/doUserDelete")
public class DoUserDeleteServlet extends HttpServlet {
    IUserDao userDao = new UserDaoImpl();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setCharacterEncoding("UTF-8");//设置服务器端编码
        response.setContentType("text/html;charset=UTF-8");//设置浏览器端解码

        //从客户端请求里，读取出汽车删除条件相关的参数userId
        String userId = request.getParameter("userId");
        //判断userId是否为空
        if (StringUtils.isBlank(userId)) {
            response.setStatus(HttpServletResponse.SC_BAD_REQUEST);//SC_BAD_REQUEST = 400;
            response.getWriter().write("请求参数为空");
            return;
        }
        //删除用户
        long  user = userDao.deleteUser(Long.parseLong(userId));


        //响应删除汽车请求
        if (user == 0) {
            response.setStatus(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
            response.getWriter().write("删除用户失败");
            return;
        }
        //响应删除汽车请求
        response.setStatus(HttpServletResponse.SC_OK);
        DoUserDeleteResponse deleteResponse = new DoUserDeleteResponse(
                HttpServletResponse.SC_OK, "删除用户成功",Long.parseLong(userId)
        );
        response.getWriter().write(JSONObject.toJSONString(deleteResponse));
    }