员工管理系统，实现增删改查！

学完了servlet、数据库、以及之前的jsp。我们可以做一个管理系统，将知识综合起来运用！

一、创建数据库，表名 easyui。

二、实现增删改查。

1.新建web项目，导入所需要的4个包

2.包的分层工具包将之前的复制过来就好了。

dao部分创建接口和实现类。实现类在dao包下新建包impl。

package com.aaa.dao;

import com.aaa.entity.Employee;

import java.util.List;
import java.util.Map;

public interface IDengDAO {
    boolean goDeng(String username,String password);
    //查询所有员工
    List<Map<String,Object>> getAll();
    //添加员工的方法
    boolean add(Employee emp);
    //删除员工的方法
    boolean delete(int id);
    //修改员工的方法
    boolean update(Employee emp);
    //根据id 获取员工
    Map<String ,Object>getEmp(int id);

}

impl部分

package com.aaa.dao.Impl;

import com.aaa.dao.IDengDAO;
import com.aaa.entity.Employee;
import com.aaa.util.DBUtil;

import java.util.List;
import java.util.Map;

public class DengDAOImpl implements IDengDAO {
    @Override
    public boolean goDeng(String username, String password) {
        String sql="select * from login where username=? and password=?";
        List<Map<String, Object>> list = DBUtil.executeQuery(sql, username, password);
        return list.size()>0;
    }

    @Override
    public List<Map<String, Object>> getAll() {
        String sql = "select e.id,e.name,e.telephone,e.hiredate,e.state,d.name dname,r.name rname from employee e INNER JOIN department  d on e.deptID = d.id INNER JOIN role r on e.roleID = r.id";

        return DBUtil.executeQuery(sql);
    }

    @Override
    public boolean add(Employee emp) {
        String sql = "insert into employee (name,telephone,deptID,roleID,state) values (?,?,?,?,?)";
        return DBUtil.executeUpdate(sql,emp.getName(),emp.getTelephone(),emp.getDeptID(),emp.getRoleID(),emp.getState());
    }

    @Override
    public boolean delete(int id) {
        String sql = "delete from employee where id = ?";
        return DBUtil.executeUpdate(sql, id);
    }

    @Override
    public boolean update(Employee emp) {
        String sql = "update employee set name = ? , telephone = ? , deptID=?  , roleID=? ,state = ? where id = ?";
        return DBUtil.executeUpdate(sql,emp.getName(),emp.getTelephone(),emp.getDeptID(),emp.getRoleID(),emp.getState(),emp.getId());
    }

    @Override
    public Map<String, Object> getEmp(int id) {
        String sql = "select * from employee where id = ?";
        List<Map<String, Object>> list = DBUtil.executeQuery(sql, id);

        if(list.size()>0){
            return  list.get(0);
        }

        return null;
    }
}

entity实体类部分

package com.aaa.entity;

public class Employee {
    private  int id;
    private  String name;
    private  String telephone;
    private  int deptID;
    private  int roleID;
    private  int state;

    public Employee() {

    }

    public Employee(int id, String name, String telephone, int deptID, int roleID, int state) {
        this.id = id;
        this.name = name;
        this.telephone = telephone;
        this.deptID = deptID;
        this.roleID = roleID;
        this.state = state;
    }

    public Employee(String name, String telephone, int deptID, int roleID, int state) {
        this.name = name;
        this.telephone = telephone;
        this.deptID = deptID;
        this.roleID = roleID;
        this.state = state;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getTelephone() {
        return telephone;
    }

    public void setTelephone(String telephone) {
        this.telephone = telephone;
    }

    public int getDeptID() {
        return deptID;
    }

    public void setDeptID(int deptID) {
        this.deptID = deptID;
    }

    public int getRoleID() {
        return roleID;
    }

    public void setRoleID(int roleID) {
        this.roleID = roleID;
    }

    public int getState() {
        return state;
    }

    public void setState(int state) {
        this.state = state;
    }

    @Override
    public String toString() {
        return "Employee{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", telephone='" + telephone + '\'' +
                ", deptID=" + deptID +
                ", roleID=" + roleID +
                ", state=" + state +
                '}';
    }
}

3.创建登录界面index.jsp，在web目下。并创建LoginServlet 进行业务操作。

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2019/4/18
  Time: 20:06
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <%-- 此时  这里仅仅只是登录界面  不通过servlet  用户直接在浏览器中访问index.jsp --%>
    <title>用户登录界面</title>
      <style>
        fieldset{width: 300px;margin: 100px auto;}
      </style>
  </head>
  <body>
    <fieldset>
      <legend>用户登录</legend>

      <%--密码错误 通过 error 关键字  获得 错误提示信息--%>
      <div style="color: red">${error}</div>

      <%--提交的地址  是我们所写的loginServlet 注意路径格式--%>
      <form action="/zxf/deng" method="post">
        <div>
          姓名：<input type="type" name="username"/>
        </div>
        <div>
          密码：&nbsp;&nbsp;<input type="password" name="password"/>
        </div>
        <button >登录</button>
      </form>
    </fieldset>
  </body>
</html>

package com.aaa.servelt;

import com.aaa.dao.IDengDAO;
import com.aaa.dao.Impl.DengDAOImpl;

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("/deng")  //虚拟路径    form表单的提交地址 /zxf/deng
public class LoginServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
    {
        //1.获取  我们在登录界面  输入的密码和用户名
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        //2.调用dao方法进行验证
        IDengDAO dao=new DengDAOImpl();
        boolean goDeng = dao.goDeng(username, password);
        //3.判断密码 是否正确
        if (goDeng){
          //4.正确 重定向 到main.jsp页面
          resp.sendRedirect("/zxf/main.jsp");
        }else
            {
            //5.错误  共享数据 请求转发到 index.jsp
            req.setAttribute("error","账号密码错误，请重试！");
            req.getRequestDispatcher("/index.jsp").forward(req,resp);
        }


    }
}

登录不成功会提示错误。登陆成功，就跳转到main.jsp部分

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2019/4/18
  Time: 20:53
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>员工数据库系统</title>
    <style>
        ul,iframe{
            float: left;
        }
        ul{
            width: 15%;
        }
        iframe{
            width: 80%;
        }
    </style>
</head>
<body>
    <h1>欢迎来到员工管理系统</h1>
    <div>
        <ul>
            <li><a href="/zxf/emp" target="show">员工管理</a></li>
            <li><a href="/zxf/add.jsp" target="show">添加员工</a></li>
        </ul>
        <iframe name="show" height="800px"></iframe>
    </div>
</body>
</html>

点击员工管理，跳转到

package com.aaa.servelt;

import com.aaa.dao.IDengDAO;
import com.aaa.dao.Impl.DengDAOImpl;

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.util.List;
import java.util.Map;

@WebServlet("/emp")  //main.jsp 的员工管理  跳转到这
public class EmpServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取所有数据
        IDengDAO dao=new DengDAOImpl();
        List<Map<String, Object>> list = dao.getAll();
        //共享数据
        req.setAttribute("list",list);
        //请求转发
        req.getRequestDispatcher("/emp.jsp").forward(req,resp);
    }
}

转发到 emp.jsp

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2019/4/19
  Time: 16:37
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head>
    <title>Title</title>
</head>
<body>
<table border="1" cellspacing="0" width="95%" align="center">
    <tr>
        <th>员工编号</th>
        <th>员工姓名</th>
        <th>员工手机号</th>
        <th>入职时间</th>
        <th>员工部门</th>
        <th>员工角色</th>
        <th>员工状态</th>
        <th>员工操作</th>
    </tr>
    <c:forEach var="emp" items="${list}">
        <tr>
            <th>${emp.id}</th>
            <th>${emp.name}</th>
            <th>${emp.telephone}</th>
            <th>${emp.hiredate}</th>
            <th>${emp.dname}</th>
            <th>${emp.rname}</th>
            <th>${emp.state==1?"在职":"离职"}</th>
            <th>
                <%-- 修改和删除 有各自要跳转的servlet页面--%>
                <a href="/zxf/delete?id=${emp.id}">删除</a>
                <a href="/zxf/toUpdate?id=${emp.id}">修改</a>
            </th>
        </tr>
    </c:forEach>

</table>
</body>
</html>

点节删除跳转到DeleteEmpServlet

package com.aaa.servelt;

import com.aaa.dao.IDengDAO;
import com.aaa.dao.Impl.DengDAOImpl;

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("/delete") 
public class DeleteEmpServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       //获取请求参数
        String id = req.getParameter("id");
        //调用dao  根据id删除员工。
        IDengDAO dao=new DengDAOImpl();
        boolean delete = dao.delete(Integer.parseInt(id));
        //重定向到  emp
        resp.sendRedirect("/zxf/emp");
    }
}

点击修改员工，跳转到ToUpdateServlet

package com.aaa.servelt;

import com.aaa.dao.IDengDAO;
import com.aaa.dao.Impl.DengDAOImpl;

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.util.Map;

@WebServlet("/toUpdate")
/*
    修改 用户点击修改按钮请求到servlet
    先要获取 要修改的员工信息 共享给jsp 请求转发过去  展示给用户看

 */
public class ToUpdate extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       //获取参数
        String id = req.getParameter("id");
        //根据ID获取员工信息
        IDengDAO dao=new DengDAOImpl();
        Map<String, Object> emp= dao.getEmp(Integer.parseInt(id));
        //共享员工信息
        req.setAttribute("emp",emp);
        //请求转发
        req.getRequestDispatcher("/update.jsp").forward(req,resp);
    }
}

他会请求转发到 update.jsp

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2019/4/18
  Time: 9:14
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改</title>
    <style type="text/css">
        fieldset{width: 300px;margin: 100px auto;}
    </style>
</head>
<body>
<fieldset id="">
    <legend>修改员工</legend>
    <form action="/zxf/update" method="post">
        <input  type="hidden"   name="id" value="${emp.id}"   />
        <div>
            员工姓名： <input name="name" value="${emp.name}" />
        </div>
        <div>
            员工手机： <input name="telephone" value="${emp.telephone}" />
        </div>

        <div>
            员工部门：
            <select name="deptID" id="deptID" >
                <option value="1"   ${emp.deptID==1?"selected":""}     >总经办</option>
                <option value="2"   ${emp.deptID==2?"selected":""}     >人事部</option>
                <option value="3"   ${emp.deptID==3?"selected":""}     >业务部</option>
            </select>
        </div>
        <div>
            员工角色：
            <select name="roleID" id="roleID" >
                <option value="1" id="r1">超级管理员</option>
                <option value="2" id="r2">员工管理员</option>
                <option value="3" id="r3">业务管理员</option>
            </select>


        </div>
        <div>
            员工状态：
            <select name="state" >
                <option value="0" id="s0">离职</option>
                <option value="1" id="s1">在职</option>
            </select>
        </div>

        <button>修改</button>
    </form>

</fieldset>
<script>
    // 当前表单的表单元素 够不够
    // 让 角色下拉框中的   1 2 3
    document.getElementById("r"+${emp.roleID}).selected = "selected";
    document.getElementById("s"+${emp.state}).selected = "selected";
</script>

</body>
</html>

这里的jsp页面会跳转到UpdateServlet

package com.aaa.servelt;

import com.aaa.dao.IDengDAO;
import com.aaa.dao.Impl.DengDAOImpl;
import com.aaa.entity.Employee;

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("/update")
public class UpdateEmpServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取请求参数  处理请求乱码
        req.setCharacterEncoding("UTF-8");
        req.setCharacterEncoding("UTF-8");
        // 1 获取请求参数
        String name = req.getParameter("name");
        String telephone = req.getParameter("telephone");
        String deptID = req.getParameter("deptID");
        String roleID = req.getParameter("roleID");
        String state = req.getParameter("state");
        String id = req.getParameter("id");

        Employee employee = new Employee(Integer.parseInt(id), name, telephone, Integer.parseInt(deptID), Integer.parseInt(roleID), Integer.parseInt(state));
        //2 通过dao将数据添加到数据库中
        IDengDAO dao=new DengDAOImpl();
        boolean update = dao.update(employee);
        //3 重定向到/emp
        resp.sendRedirect("/zxf/emp");
    }
}

他又回到了emp 就是EmpServlet。

到此删除和修改的功能完成。

回到 man.jsp 点击添加员工。他会跳转到 add.jsp 页面

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2019/4/17
  Time: 11:48
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
    <style type="text/css">
        fieldset{width: 300px;margin: 100px auto;}
    </style>
</head>
<body>

<fieldset id="">
    <legend>添加员工</legend>
    <%-- 跳转到 /zxf/addEmp 这个servlet--%>
    <form action="/zxf/addEmp" method="post">
        <div>
            员工姓名： <input name="name" />
        </div>
        <div>
            员工手机： <input name="telephone" />
        </div>
        <div>
            员工部门：
            <select name="deptID">
                <option value="1">总经办</option>
                <option value="2">人事部</option>
                <option value="3">业务部</option>
            </select>
        </div>
        <div>
            员工角色：
            <select name="roleID">
                <option value="1">超级管理员</option>
                <option value="2">员工管理员</option>
                <option value="3">业务管理员</option>
            </select>
        </div>
        <div>
            员工状态：
            <select name="state">
                <option value="0">离职</option>
                <option value="1">在职</option>
            </select>
        </div>

        <button>添加</button>
    </form>

</fieldset>



</body>
</html>

这里的jsp 会跳转到AddServlet

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/addEmp")
public class AddEmpServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //处理1.请求乱码---->浏览器发给 servlet  乱码
        //    2.响应乱码----->servlet 回传给浏览器之后乱码  不用处理 为啥？ 因为我们将其交给了 jsp  来解决！
        req.setCharacterEncoding("utf-8");
        // 1 获取请求参数
        String name = req.getParameter("name");
        String telephone = req.getParameter("telephone");
        String deptID = req.getParameter("deptID");
        String roleID = req.getParameter("roleID");
        String state = req.getParameter("state");

        Employee employee = new Employee(name,telephone,Integer.parseInt(deptID),Integer.parseInt(roleID),Integer.parseInt(state));
        // 2 调用dao 将数据添加到数据库中
        IDengDAO dao=new DengDAOImpl();
        dao.add(employee);
        // 3 回传信息 成功/失败
        req.setAttribute("msg","添加成功");
        // 4 请求转发到 add.jsp
        req.getRequestDispatcher("/add.jsp").forward(req,resp);

    }
}

这里会将数据传送给add.jsp。

好了，添加员工完成! 增删改查实现，舒服。

三、总结。

　　1.jsp是用来展示数据的

　　2.servlet 是用来进行业务操作的请求转发和重定向。

　　3.bug虽然痛苦，但自己解决的时候，也很开心。-------菜鸟的心得！

四，展示所有的文件目录

员工管理系统 ，实现增删改查！

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