src/sanrenxing/right/servlet/UserServlet.java

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package sanrenxing.right.servlet;
import com.google.gson.Gson;
import sanrenxing.right.biz.UserBiz;
import sanrenxing.right.entity.UserEntity;

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;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.List;

@WebServlet("/UserServlet")
public class UserServlet extends HttpServlet {
    UserBiz userBiz =new UserBiz();
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //接收来自客户端发送的方法名
        String method=request.getParameter("method");
        if(method.equals("insertUser")) {//增加用户
            insertUser(request,response);
        }
        else if(method.equals("updateUser")) {//修改用户
            updateUser(request,response);
        }
        if(method.equals("deleteUser")) {//删除用户
            deleteUser(request,response);
        }
        if(method.equals("selectUser")) {//查询显示用户数据
            selectUser(request,response);
        }
    }

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

    /**
     * 增加的服务类方法
     * @param request 请求对象
     * @param response 响应对象
     * @throws ServletException
     * @throws IOException
     */
    protected void insertUser(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //接收客户数据的用户编号
        String strUserId=request.getParameter("userId");
        //定义一个保存用户编号的int
        int userId=0;
        //判断用户编号是否为空
        if(strUserId!=null && !strUserId.equals("")) {
            //如果用户编号不为空则转换为int类型
            userId=Integer.parseInt(strUserId);
        }
        //接收用户账号
        String userName=request.getParameter("userName");
        //接收用户密码
        String userPwd=request.getParameter("userPwd");