2020.11.12

一、今日学习内容：

分级自测的人口普查系统：

package Dao;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import entity.People;
import util.DBUtil;

/**
 * 课程Dao
 * Dao层操作数据
 * @author Hu
 *
 */
public class PeopleDao {

    /**
     * 添加
     * @param course
     * @return
     */
    public boolean add(People people) {
        String sql = "insert into people(hubie,leixing,area,number,name,IDcard,sex,minzu,edu) values('" + people.getHubie() + "','" + people.getLeixing() + "','" 
    + people.getArea() +"','"+ people.getNumber()+"','"+people.getName()+"','"+people.getIDcard()+"','"+people.getSex()+"','"+people.getMinzu()+"','"+ people.getEdu()+ "')";
        //创建数据库链接
        Connection conn = DBUtil.getConn();
        Statement state = null;
        boolean f = false;
        int a = 0;

        try {
            state = conn.createStatement();
            state.executeUpdate(sql);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //关闭连接
            DBUtil.close(state, conn);
        }

        if (a > 0) {
            f = true;
        }
        return f;
    }

    /**
     * 删除
     *
     * @param id
     * @return
     */
    public boolean delete (String name) {
        boolean f = false;
        String sql = "delete from people where name='" + name + "'";

        Connection conn = DBUtil.getConn();
        Statement state = null;
        int a = 0;

        try {
            state = conn.createStatement();
            a = state.executeUpdate(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(state, conn);
        }

        if (a > 0) {
            f = true;
        }
        return f;
    }

    /**
     * 修改
     * @param name
     * @param pass
     */
    public boolean update(People people) {
        String sql = "update people set hubie='" + people.getHubie() + "', leixing='" + people.getLeixing() + "', area='" + people.getArea()+"', number='" + people.getNumber()
         +"', name='" + people.getName() +"',IDcard='" + people.getIDcard() +"', sex='" + people.getSex() +"', minzu='" + people.getMinzu()+"', edu='" + people.getEdu()+ "' where id='" + people.getId() + "'";
        Connection conn = DBUtil.getConn();
        Statement state = null;
        boolean f = false;
        int a = 0;

        try {
            state = conn.createStatement();
            a = state.executeUpdate(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(state, conn);
        }

        if (a > 0) {
            f = true;
        }
        return f;
    }

    /**
     * 验证课程名称是否唯一
     * true --- 不唯一
     * @param name
     * @return
     */
    public boolean name(String name) {
        boolean flag = false;
        String sql = "select name from people where name = '" + name + "'";
        Connection conn = DBUtil.getConn();
        Statement state = null;
        ResultSet rs = null;

        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            while (rs.next()) {
                flag = true;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(rs, state, conn);
        }
        return flag;
    }

    /**
     * 通过ID得到课程信息
     * @param id
     * @return
     */
    public People getPeopleById(int id) {
        String sql = "select * from people where id ='" + id + "'";
        Connection conn = DBUtil.getConn();
        Statement state = null;
        ResultSet rs = null;
        People people = null;

        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            while (rs.next()) {
                 String hubie=rs.getString("hubie");
                 String leixing=rs.getString("leixing");
                 String area = rs.getString("area");
                 String number = rs.getString("number");
                 String name1= rs.getString("name");
                 String IDcard =rs.getString("IDcard");
                 String sex=rs.getString("sex");
                 String minzu=rs.getString("minzu");
                 String edu=rs.getString("edu");
                people = new People(id,hubie,leixing,area,number,name1,IDcard,sex,minzu,edu);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(rs, state, conn);
        }

        return people;
    }

    /**
     * 通过name得到People
     * @param name
     * @return
     */
    public People getPeopleByname(String name) {
        String sql = "select * from people where name ='" + name + "'";
        Connection conn = DBUtil.getConn();
        Statement state = null;
        ResultSet rs = null;
        People people = null;

        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            while (rs.next()) {
                
                String hubie=rs.getString("hubie");
                String leixing=rs.getString("leixing");
                String area = rs.getString("area");
                String number = rs.getString("number");
                String name1= rs.getString("name");
                String IDcard1 =rs.getString("IDcard");
                String sex=rs.getString("sex");
                String minzu=rs.getString("minzu");
                String edu=rs.getString("edu");
                people = new People(hubie,leixing,area,number,name1,IDcard1,sex,minzu,edu);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(rs, state, conn);
        }

        return people;
    }

    /**
     * 查找
     * @param name
     * @param teacher
     * @param classroom
     * @return
     */
    public List<People> search(String hubie,String leixing, String area, String number, String name, String IDcard, String sex,String minzu,String edu)  {
        String sql = "select * from people where ";
        if (name != "") {
            sql += "name like '%" + name + "%'";
        }
        if (IDcard != "") {
            sql += "teacher like '%" + IDcard + "%'";
        }
        if (sex!= "") {
            sql += "classroom like '%" + sex + "%'";
        }
        List<People> list = new ArrayList<>();
        Connection conn = DBUtil.getConn();
        Statement state = null;
        ResultSet rs = null;

        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            People bean = null;
            while (rs.next()) {
                int id = rs.getInt("id");
                String hubie1=rs.getString("hubie");
                String leixing1=rs.getString("leixing");
                String area1 = rs.getString("area");
                String number1 = rs.getString("number");
                String name1= rs.getString("name");
                String IDcard1 =rs.getString("IDcard");
                String sex1=rs.getString("sex");
                String minzu1=rs.getString("minzu");
                String edu1=rs.getString("edu");
                bean = new People(id, hubie1,leixing1,area1,number1,name1,IDcard1,sex1,minzu1,edu1);
                list.add(bean);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(rs, state, conn);
        }

        return list;
    }

    /**
     * 全部数据
     * @param name
     * @param teacher
     * @param classroom
     * @return
     */
    public List<People> list() {
        String sql = "select * from people";
        List<People> list = new ArrayList<>();
        Connection conn = DBUtil.getConn();
        Statement state = null;
        ResultSet rs = null;

        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            People bean = null;
            while (rs.next()) {
                int id1 = rs.getInt("id");
                String hubie1=rs.getString("hubie");
                String leixing1=rs.getString("leixing");
                String area1 = rs.getString("area");
                String number1 = rs.getString("number");
                String name1 = rs.getString("name");
                String IDcard1 =rs.getString("IDcard");
                String sex1=rs.getString("sex");
                String minzu1=rs.getString("minzu");
                String edu1=rs.getString("edu");
                bean = new People(id1, hubie1,leixing1,area1,number1,name1,IDcard1,sex1,minzu1,edu1);
                list.add(bean);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(rs, state, conn);
        }

        return list;
    }

}

package util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
* 数据库连接工具
* @author Hu
*
*/
public class DBUtil {

  public static String db_url = "jdbc:mysql://localhost:3306/test1?serverTimezone=UTC";
  public static String db_user = "root";
  public static String db_pass = "08301016";

  public static Connection getConn() {
      Connection conn = null;

      try {
          Class.forName("com.mysql.cj.jdbc.Driver");//加载驱动
          conn = DriverManager.getConnection(db_url, db_user, db_pass);
      } catch (Exception e) {
          e.printStackTrace();
      }

      return conn;
  }

  /**
   * 关闭连接
   * @param state
   * @param conn
   */
  public static void close (Statement state, Connection conn) {
      if (state != null) {
          try {
              state.close();
          } catch (SQLException e) {
              e.printStackTrace();
          }
      }

      if (conn != null) {
          try {
              conn.close();
          } catch (SQLException e) {
              e.printStackTrace();
          }
      }
  }

  public static void close (ResultSet rs, Statement state, Connection conn) {
      if (rs != null) {
          try {
              rs.close();
          } catch (SQLException e) {
              e.printStackTrace();
          }
      }

      if (state != null) {
          try {
              state.close();
          } catch (SQLException e) {
              e.printStackTrace();
          }
      }

      if (conn != null) {
          try {
              conn.close();
          } catch (SQLException e) {
              e.printStackTrace();
          }
      }
  }

  public static void main(String[] args) throws SQLException {
      Connection conn = getConn();
      PreparedStatement pstmt = null;
      ResultSet rs = null;
      String sql ="select * from people";
      pstmt = conn.prepareStatement(sql);
      rs = pstmt.executeQuery();
      if(rs.next()){
          System.out.println("空");
      }else{
          System.out.println("不空");
      }
  }
}

package entity;

public class People {
    private int id;
    private String hubie;//单选框
    private String leixing;  //单选框
    private String area;
    private String number;
    private String name;
    private String IDcard;
    private String sex;  //单选框
    private String minzu;
    private String edu;  //下拉框
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getHubie() {
        return hubie;
    }
    public void setHubie(String hubie) {
        this.hubie = hubie;
    }
    public String getLeixing() {
        return leixing;
    }
    public void setLeixing(String leixing) {
        this.leixing = leixing;
    }
    public String getArea() {
        return area;
    }
    public void setArea(String area) {
        this.area = area;
    }
    public String getNumber() {
        return number;
    }
    public void setNumber(String number) {
        this.number = number;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getIDcard() {
        return IDcard;
    }
    public void setIDcard(String IDcard) {
        this.IDcard = IDcard;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public String getMinzu() {
        return minzu;
    }
    public void setMinzu(String minzu) {
        this.minzu = minzu;
    }
    public String getEdu() {
        return edu;
    }
    public void setEdu(String edu) {
        this.edu = edu;
    }
    public People(int id, String hubie,String leixing, String area, String number, String name, String IDcard, String sex,String minzu,String edu) {
        super();
        this.id = id;
        this.hubie=hubie;
        this.leixing=leixing;
        this.area=area;
        this.number=number;
        this.name = name;
        this.IDcard=IDcard;
        this.sex = sex;
        this.minzu = minzu;
        this.edu=edu;
    }
    public People(String hubie,String leixing, String area, String number, String name, String IDcard, String sex,String minzu,String edu) {
        super();
        this.hubie=hubie;
        this.leixing=leixing;
        this.area=area;
        this.number=number;
        this.name = name;
        this.IDcard=IDcard;
        this.sex = sex;
        this.minzu = minzu;
        this.edu=edu;
    }
    public People() {}
}

package service;

import java.util.List;

import Dao.PeopleDao;
import entity.People;

/**
 * CourseService
 * 服务层
 * @author Hu
 *
 */
public class PeopleService {

    PeopleDao pDao = new PeopleDao();

    /**
     * 添加
     * @param course
     * @return
     */
    public boolean add(People people) {
        boolean f = false;
        if(!pDao.name(people.getName())) {
            pDao.add(people);
            f = true;
        }
        return f;
    }

    /**
     * 删除
     */
    public void del(String name) {
        pDao.delete(name);
    }

    /**
     * 修改
     * @return
     */
    public void update(People people) {
        pDao.update(people);
    }

    /**
     * 通过ID得到一个Course
     * @return
     */
    public People getPeopleById(int id) {
        return pDao.getPeopleById(id);
    }

    /**
     * 通过Name得到一个Course
     * @return
     */
    public People getPeopleByname(String name) {
        return pDao.getPeopleByname(name);
    }

    /**
     * 查找
     * @return
     */
    public List<People> search(String hubie,String leixing, String area, String number, String name, String IDcard, String sex,String minzu,String edu)  {
        return pDao.search(hubie,leixing,area,number,name,IDcard,sex,minzu,edu);
    }

    /**
     * 全部数据
     * @return
     */
    public List<People> list() {
        return pDao.list();
    }
}

package servlet;

import java.io.IOException;
import java.util.List;

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 entity.People;
import service.PeopleService;

@WebServlet("/PeopleServlet")
public class PeopleServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    PeopleService service = new PeopleService();

    /**
     * 方法选择
     */
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        String method = req.getParameter("method");

        if ("add".equals(method)) {
            add(req, resp);
        } else if ("del".equals(method)) {
            del(req, resp);
        } else if ("update".equals(method)) {
            update(req, resp);
        } else if ("search".equals(method)) {
            search(req, resp);
        } else if ("getPeopleById".equals(method)) {
            getPeopleById(req, resp);
        } else if ("getPeopleByname".equals(method)) {
            getPeopleByname(req, resp);
        } else if ("list".equals(method)) {
            list(req, resp);
        }
    }

    /**
     * 添加
     * @param req
     * @param resp
     * @throws IOException
     * @throws ServletException
     */
    private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
        req.setCharacterEncoding("utf-8");
        //获取数据
        String hubie=req.getParameter("hubie");
        String leixing=req.getParameter("leixing");
        String area = req.getParameter("area");
        String number = req.getParameter("number");
        String name = req.getParameter("name");
        String IDcard =req.getParameter("IDcard");
        String sex=req.getParameter("sex");
        String minzu=req.getParameter("minzu");
        String edu=req.getParameter("edu");
        People people=new People(hubie,leixing,area,number,name,IDcard,sex,minzu,edu);
        //添加后消息显示
        if(service.add(people)) {
            req.setAttribute("message", "添加成功");
            req.getRequestDispatcher("add.jsp").forward(req,resp);
        } else {
            req.setAttribute("message", "名称重复，请重新录入");
            req.getRequestDispatcher("add.jsp").forward(req,resp);
        }
    }

    /**
     * 全部
     * @param req
     * @param resp
     * @throws ServletException
     */
    private void list(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");

        List<People> peoples = service.list();
        //Object peoples = null;
        req.setAttribute("peoples", peoples);
        req.getRequestDispatcher("list.jsp").forward(req,resp);
    }

    /**
     * 通过ID得到Course
     * @param req
     * @param resp
     * @throws ServletException
     */
    private void getPeopleById(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        int id = Integer.parseInt(req.getParameter("id"));
        People people = service.getPeopleById(id);
        req.setAttribute("people", people);
        req.getRequestDispatcher("detail2.jsp").forward(req,resp);
    }

    /**
     * 通过名字查找
     * 跳转至删除
     * @param req
     * @param resp
     * @throws IOException
     * @throws ServletException
     */
    private void getPeopleByname(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        String name = req.getParameter("name");
        People people = service.getPeopleByname(name);
        if(people == null) {
            req.setAttribute("message", "查无此信息！");
            req.getRequestDispatcher("del.jsp").forward(req,resp);
        } else {
            req.setAttribute("people", people);
            req.getRequestDispatcher("detail.jsp").forward(req,resp);
        }
    }

    /**
     * 删除
     * @param req
     * @param resp
     * @throws IOException
     * @throws ServletException
     */
    private void del(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        String name=req.getParameter("name");
        service.del(name);
        req.setAttribute("message", "删除成功！");
        req.getRequestDispatcher("PeopleServlet?method=list").forward(req,resp);
    }

    /**
     * 修改
     * @param req
     * @param resp
     * @throws IOException
     * @throws ServletException
     */
    private void update(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        int id = Integer.parseInt(req.getParameter("id"));
        String hubie=req.getParameter("hubie");
        String leixing=req.getParameter("leixing");
        String area = req.getParameter("area");
        String number = req.getParameter("number");
        String name = req.getParameter("name");
        String IDcard =req.getParameter("IDcard");
        String sex=req.getParameter("sex");
        String minzu=req.getParameter("minzu");
        String edu=req.getParameter("edu");
        People people = new People(id,hubie,leixing,area,number,name,IDcard,sex,minzu,edu);

        service.update(people);
        req.setAttribute("message", "修改成功");
        req.getRequestDispatcher("PeopleServlet?method=list").forward(req,resp);
    }

    /**
     * 查找
     * @param req
     * @param resp
     * @throws ServletException
     */
    private void search(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        String hubie=req.getParameter("hubie");
        String leixing=req.getParameter("leixing");
        String area = req.getParameter("area");
        String number = req.getParameter("number");
        String name = req.getParameter("name");
        String IDcard =req.getParameter("IDcard");
        String sex=req.getParameter("sex");
        String minzu=req.getParameter("minzu");
        String edu=req.getParameter("edu");
        List<People> peoples = service.search(hubie,leixing,area,number,name,IDcard,sex,minzu,edu);
        req.setAttribute("peoples", peoples);
        req.getRequestDispatcher("searchlist.jsp").forward(req,resp);
    }
}

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
   <%
          Object message = request.getAttribute("message");
          if(message!=null && !"".equals(message)){
      
     %>
          <script type="text/javascript">
               alert("<%=request.getAttribute("message")%>");
          </script>
     <%} %>
     <div align="center">
        <h1 style="color: black;">人口登记页面</h1>
        <a href="index.jsp">返回主页</a>

    <div class="content">
        <div class="main">
        <form name="form" action="PeopleServlet?method=add" method="post" >
            <table>
                <tr>
                  <td>户别：</td>
                    <td>
                    <input type="radio"name="hubie"value="家庭户"checked>家庭户
                    <input type="radio"name="hubie"value="集体户">集体户
                   </td>
                </tr>
                <tr>
                  <td>住房类型：</td>
                    <td>
                    <input type="radio"name="leixing"value="家庭住宅"checked>家庭住宅
                    <input type="radio"name="leixing"value="集体住所">集体住所
                    <input type="radio"name="leixing"value="工作地住所">工作地住所
                    <input type="radio"name="leixing"value="其他住宅">其他住宅
                    <input type="radio"name="leixing"value="无住宅">无住宅
                   </td>
                </tr>
                <tr>
                    <td>本户现住房面积</td>
                    <td><input type="text" id="area" name="area" placeholder="输入整数" /></td>
                </tr>
                <tr>
                    <td>本户现住房间数</td>
                    <td><input type="text" id="number" name="number" placeholder="输入整数" /></td>
                </tr>
                <tr>
                    <td>户主姓名</td>
                    <td><input type="text" id="name" name="name" /></td>
                </tr>
                <tr>
                    <td>身份证号</td>
                    <td><input type="text" id="IDcard" name="IDcard" placeholder="13位数字（最后一位可为X）" /></td>
                </tr>
                <tr>
                    <td>性别</td>
                    <td>
                        <label for="man" class="radio">
                        <span class="radio-bg"></span>
                        <input type="radio" name="sex" id="man" value="男" checked="checked" /> 男
                        <span class="radio-on"></span>
                        </label>
                        <label for="woman" class="radio">
                        <span class="radio-bg"></span>
                        <input type="radio" name="sex" id="woman" value="女" /> 女
                        <span class="radio-on"></span>
                        </label>
                    </td>
                </tr>
                <tr>
                    <td>民族</td>
                    <td><input type="text" id="minzu" name="minzu" /></td>
                </tr>
                <tr>
                    <td>受教育程度</td>
                    <td>
                        <select name="edu" class="shortselect">
                            <option>研究生</option>
                            <option>大学本科</option>
                            <option>大学专科</option>
                            <option>高中</option>
                            <option>初中</option>
                            <option>小学</option>
                            <option>未上过学</option>
                        </select>
                    </td>
                </tr>
                <tr>
                    <td><button type="submit" class="b">提      交<tton></td>
                </tr>
            </table>
        </form>
<script type="text/javascript">
function check() {
    var IDcard = document.getElementById("IDcard");;
    if(IDcard.value.length!=13){
        alert('身份证位数有误！');
        IDcard.focus();
        return false;
    }
}
</script>
        </div>
    </div>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
          Object message = request.getAttribute("message");
          if(message!=null && !"".equals(message)){
      
     %>
          <script type="text/javascript">
               alert("<%=request.getAttribute("message")%>");
          </script>
     <%} %>
<script type="text/javascript">
function check(form)
{
    var name=form.name.value;
    if(name=="")
    {
        alert("名称不能为空");
        form.name.focus();
        return false;
    }
}
</script>
<div align="center">删除信息</h>
<div class="content">
    <div class="main">
    <a href="index.jsp">返回主页</a>
    <br><br>
        <form name="form" action="PeopleServlet?method=getPeopleByname" method="post" onsubmit="return check(form)">
                <a>户主姓名:</a>&nbsp;&nbsp;<input type="text" id="name" name="name" />
                <br><br>
                <input type="submit" value="删除" />
        </form>
        </div>
    </div>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
    .a{
        margin-top: 20px;
    }
    .b{
        font-size: 20px;
         160px;
        color: white;
        background-color: greenyellow;
    }
    .tb, td {
        border: 1px solid black;
        font-size: 22px;
    }
</style>
</head>
<body>
    <div align="center">
        <h1 style="color: black;">用户信息删除</h1>
        <a href="index.jsp">返回主页</a>
        <table class="tb">
            <tr>
                <td>用户姓名</td>
                <td>${people.name}</td>
            </tr>
            <tr>
                <td>身份证号</td>
                <td>${people.IDcard}</td>
            </tr>
            <tr>
                <td>性别</td>
                <td>${people.sex}</td>
            </tr>
            <tr>
                <td>户别</td>
                <td>${people.hubie}</td>
            </tr>
            <tr>
                <td>住房类型</td>
                <td>${people.leixing}</td>
            </tr>
            <tr>
                <td>本户现住房面积</td>
                <td>${people.area}</td>
            </tr>
            <tr>
                <td>本户现住房间数</td>
                <td>${people.number}</td>
            </tr>
            <tr>
                <td>受教育程度</td>
                <td>${people.edu}</td>
            </tr>
        </table>
        <form action="PeopleServlet?method=del" method="post" onsubmit="return check();">
        <input type="hidden" id="name" name="name" value="${people.name}"> 
           <input type="submit" name="action1" value="确定删除">
        </form>
    </div>
    <script type="text/javascript">
        function check() {
            if (confirm("真的要删除吗？")){
                return true;
            }else{
                return false;
            }
        }
    </script>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>首页</title>

</head>
<body>
<p>人口普查系统</p>
    <div align="center">

        <div class="a">
            <a href="add.jsp">信息登记</a>
        </div>
        <div class="a">
            <a href="xiugai">信息修改</a>
        </div>
        <div class="a">
            <a href="del.jsp">信息删除</a>
        </div>
        <div class="a">
            <a href="search.jsp">查询信息</a>
        </div>
        <div class="a">
            <a href="PeopleServlet?method=list">人口信息浏览</a>
        </div>
    </div>
</body>
</html>

//list.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>

</head>
<body>
    <%
         Object message = request.getAttribute("message");
         if(message!=null && !"".equals(message)){

    %>
         <script type="text/javascript">
              alert("<%=request.getAttribute("message")%>");
         </script>
    <%} %>
    <div align="center">
        <h1 style="color: black;">人口信息列表</h1>
        <a href="index.jsp">返回主页</a>
        <table class="tb">
            <tr>
                <td>id</td>
                <td>户别</td>
                <td>住房类型</td>
                <td>住房间数</td>
                <td>户主姓名</td>
                <td>身份证号码</td>
                <td>性别</td>
                <td>民族</td>
                <td>受教育程度</td>
                <td align="center" colspan="2">操作</td>
            </tr>
            <c:forEach items="${peoples}" var="item">
                <tr>
                    <td>${item.id }</td>
                    <td>${item.hubie}</td>
                    <td>${item.leixing}</td>
                    <td>${item.number}</td>
                    <td>${item.name}</td>
                    <td>${item.IDcard}</td>
                    <td>${item.sex}</td>
                    <td>${item.minzu}</td>
                    <td>${item.edu}</td>
                    <td><a href="PeopleServlet?method=getcoursebyIDcard&IDcard=${item.IDcard}">修改</a></td>
                </tr>
            </c:forEach>
        </table>
    </div>
</body>
</html>