Servlet 综合案例（empProject）

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🥭本文内容：Servlet 综合案例（empProject）
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图书管理系统【Servlet+HTML综合应用】

【本文目录】

- 1.1 项目说明
- 1.2 数据库环境搭建
- - 1.2.1 创建员工信息表emp并添加数据
  - 1.2.2 创建系统管理员表empManager并添加数据
- 1.3 创建Web项目
- 1.4 基础环境搭建
- 1.5 管理员登录功能
- 1.6 查询所有员工功能
- - 1.6.1 调用业务逻辑Controller
  - 1.6.2 显示页面JSP
  - 1.6.3 权限验证过滤器
  - 1.6.4 字符编码过滤器
- 1.7 删除员工功能
- - 1.7.1 删除员工Controller
- 1.8 修改员工功能
- - 1.8.1 查询单个员工Controller
  - 1.8.2 显示修改页面JSP
  - 1.8.3 修改员工信息Controller

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1.1 项目说明

使用管理员账号登录系统，实现对员工信息的增删改查

1.2 数据库环境搭建

该案例是empProject员工管理系统。使用了两张表

员工信息表emp
系统管理员表empManager

1.2.1 创建员工信息表emp并添加数据

# 创建表emp
CREATE TABLE IF NOT EXISTS `emp`(
`id` INT PRIMARY KEY AUTO_INCREMENT,
`name` VARCHAR(20) NOT NULL,
`salary` DOUBLE NOT NULL,
`age` INT NOT NULL
);

# 向emp表中添加数据
INSERT INTO `emp`(`id`,`name`,`salary`,`age`)VALUES(1001,'张三',5200,26);
INSERT INTO `emp`(`id`,`name`,`salary`,`age`)VALUES(1002,'李四',7200,28);

1.2.2 创建系统管理员表empManager并添加数据

#创建表empManager
CREATE TABLE IF NOT EXISTS `empManager`(
`username` VARCHAR(20) NOT NULL,
`password` VARCHAR(20) NOT NULL
);

# 向empManager表中添加数据
INSERT INTO `empManager`(`username`,`password`)VALUES('如花','123456');
INSERT INTO `empManager`(`username`,`password`)VALUES('似玉','654321');

1.3 创建Web项目

创建Web项目，导入相关jar包

commons-dbutils-1.7.jar
druid-1.1.5.jar
mysql-connector-java-5.1.25-bin.jar
ValidateCode.jar

1.4 基础环境搭建

在项目下创建包目录结构如下

com.cxyzxc.www.controller包：调用业务逻辑Servlet
com.cxyzxc.www.dao包：数据访问层接口
com.cxyzxc.www.dao.impl包：数据访问层接口实现类
com.cxyzxc.www.entity包：实体类
com.cxyzxc.www.filter包：过滤器
com.cxyzxc.www.jsp包：打印显示页面Servlet
com.cxyzxc.www.service包：业务逻辑层接口
com.cxyzxc.www.service.impl包：业务逻辑层接口实现类
com.cxyzxc.www.utils包：工具类
database.properties:数据库连接及连接池配置文件

1.5 管理员登录功能

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>登录页面</title>
        <link type="text/css" rel="stylesheet" href="css/login.css"/>
    </head>
    <body>
        <div>
            <form action="/empProject01_war_exploded/manager/EmpManagerLoginController" method="post">
                <p>
                    用户名：<input type="text" name="username"/>
                </p>

                <p>
                    密码：<input type="password" name="password"/>
                </p>

                <p>
                    验证码：<input type="text" name="inputVcode">
                    <img src="/empProject01_war_exploded/createCode"/>
                </p>
                <p>
                    <input type="submit" value="登录">
                </p>
            </form>
        </div>
    </body>
</html>

EmpManagerLoginController.java编写

package com.cxyzxc.www.controller;


import com.cxyzxc.www.entity.EmpManager;
import com.cxyzxc.www.service.EmpManagerService;
import com.cxyzxc.www.service.impl.EmpManagerServiceImpl;

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 javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet(name = "EmpManagerLoginController",value = "/manager/EmpManagerLoginController")
public class EmpManagerLoginController extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.收参
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        String inputVcode = request.getParameter("inputVcode");

        //2.校验验证码
        String codes = (String)request.getSession().getAttribute("codes");
        if(!inputVcode.isEmpty() && inputVcode.equalsIgnoreCase(codes)){
            //调用业务逻辑实现登录
            EmpManagerService empManagerService = new EmpManagerServiceImpl();
            EmpManager empManager = empManagerService.login(username,password);
            if(empManager!=null){
                //登录成功
                //存储在session作用域
                HttpSession session = request.getSession();
                session.setAttribute("empManager",empManager);
                //跳转到查询所有的controller
                response.sendRedirect(request.getContextPath()+"/manager/safe/showAllEmpController");
            }else{
                response.sendRedirect(request.getContextPath()+"/login.html");
            }
        }else{
            //验证码输入错误，跳转到登录页面
            response.sendRedirect(request.getContextPath()+"/login.html");
        }
    }

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

1.6 查询所有员工功能

1.6.1 调用业务逻辑Controller

ShowAllEmpController.java编写

package com.cxyzxc.www.controller;


import com.cxyzxc.www.entity.Emp;
import com.cxyzxc.www.service.EmpService;
import com.cxyzxc.www.service.impl.EmpServiceImpl;

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;

@WebServlet(name = "ShowAllEmpController",value = "/manager/safe/showAllEmpController")
public class ShowAllEmpController extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        EmpService empService = new EmpServiceImpl();
        List<Emp> emps = empService.showAllEmp();

        request.setAttribute("emps",emps);

        request.getRequestDispatcher("/manager/safe/showAllEmpJSP").forward(request,response);
    }

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

1.6.2 显示页面JSP

package com.cxyzxc.www.jsp;

import com.cxyzxc.www.entity.Emp;

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.List;

@WebServlet(name = "ShowAllEmpJSP",value = "/manager/safe/showAllEmpJSP")
public class ShowAllEmpJSP extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.获取集合数据
        List<Emp> emps = (List<Emp>)request.getAttribute("emps");

        PrintWriter printWriter = response.getWriter();

        printWriter.println("<html>");
        printWriter.println("   <head>");
        printWriter.println("       <meta charset='UTF-8'>");
        printWriter.println("       <title>查询所有员工页面</title>");
        printWriter.println("   </head>");
        printWriter.println("   <body>");
        printWriter.println("       <table border='1'>");
        printWriter.println("           <tr>");
        printWriter.println("               <td>编号</td>");
        printWriter.println("               <td>姓名</td>");
        printWriter.println("               <td>工资</td>");
        printWriter.println("               <td>年龄</td>");
        printWriter.println("               <td colspan='2'>操作</td>");
        printWriter.println("           </tr>");
        for(Emp emp: emps){
            printWriter.println("           <tr>");
            printWriter.println("               <td>"+emp.getId()+"</td>");
            printWriter.println("               <td>"+emp.getName()+"</td>");
            printWriter.println("               <td>"+emp.getSalary()+"</td>");
            printWriter.println("               <td>"+emp.getAge()+"</td>");
            printWriter.println("               <td><a href='"+request.getContextPath()+"/manager/safe/removeEmpController?id="+emp.getId()+"'>删除<a></td>");
            printWriter.println("               <td><a href='"+request.getContextPath()+"/manager/safe/showEmpController?id="+emp.getId()+"'>修改</a></td>");
            printWriter.println("           </tr>");
        }
        printWriter.println("       </table>");
        printWriter.println("   </body>");
        printWriter.println("</html>");
    }

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

1.6.3 权限验证过滤器

验证登录的过滤器编写

package com.cxyzxc.www.filter;


import com.cxyzxc.www.entity.EmpManager;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebFilter(value = "/manager/safe/*")
public class CheckFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response = (HttpServletResponse)servletResponse;

        HttpSession session = request.getSession();
        EmpManager empManager = (EmpManager)session.getAttribute("empManager");
        if(empManager!=null){//登录过
            filterChain.doFilter(request,response);
        }else{
            response.sendRedirect(request.getContextPath()+"/login.html");
        }
    }

    @Override
    public void destroy() {

    }
}

1.6.4 字符编码过滤器

package com.cxyzxc.www.filter;


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

@WebFilter(value = "/manager/*")
public class EncodingFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        servletRequest.setCharacterEncoding("UTF-8");
        servletResponse.setContentType("text/html;charset=UTF-8");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {

    }
}

1.7 删除员工功能

1.7.1 删除员工Controller

package com.cxyzxc.www.controller;


import com.cxyzxc.www.service.EmpService;
import com.cxyzxc.www.service.impl.EmpServiceImpl;

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(name = "RemoveEmpController",value = "/manager/safe/removeEmpController")
public class RemoveEmpController extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Integer id = Integer.valueOf(request.getParameter("id"));

        EmpService empService = new EmpServiceImpl();

        empService.removeEmp(id);

        response.sendRedirect(request.getContextPath()+"/manager/safe/showAllEmpController");
    }

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

1.8 修改员工功能

1.8.1 查询单个员工Controller

package com.cxyzxc.www.controller;


import com.cxyzxc.www.entity.Emp;
import com.cxyzxc.www.service.EmpService;
import com.cxyzxc.www.service.impl.EmpServiceImpl;

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(name = "ShowEmpController",value = "/manager/safe/showEmpController")
public class ShowEmpController extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Integer id = Integer.valueOf(request.getParameter("id"));

        EmpService empService = new EmpServiceImpl();
        Emp emp = empService.showEmp(id);

        request.setAttribute("emp",emp);

        request.getRequestDispatcher("/manager/safe/showUpdateEmpInfoJSP").forward(request,response);
    }

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

1.8.2 显示修改页面JSP

package com.cxyzxc.www.jsp;

import com.cxyzxc.www.entity.Emp;

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;

@WebServlet(name = "ShowUpdateEmpInfoController",value = "/manager/safe/showUpdateEmpInfoJSP")
public class ShowUpdateEmpInfoController extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Emp emp = (Emp)request.getAttribute("emp");

        PrintWriter printWriter = response.getWriter();

        printWriter.println("<html>");
        printWriter.println("   <head>");
        printWriter.println("       <meta charset='UTF-8'>");
        printWriter.println("       <title>修改员工信息页面</title>");
        printWriter.println("   </head>");
        printWriter.println("   <body>");
        printWriter.println("       <form action='/empProject01_war_exploded/manager/safe/updateEmpController' method='post'>");
        printWriter.println("       编号：<input type='text' name='id' value='"+emp.getId()+"' readonly/><br/>");
        printWriter.println("       姓名：<input type='text' name='name' value='"+emp.getName()+"'/><br/>");
        printWriter.println("       工资：<input type='text' name='salary' value='"+emp.getSalary()+"'/><br/>");
        printWriter.println("       年龄：<input type='text' name='age' value='"+emp.getAge()+"'/><br/>");
        printWriter.println("       <input type='submit'  value='修改'/><br/>");
        printWriter.println("       </form>");
        printWriter.println("   </body>");
        printWriter.println("</html>");
    }

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

1.8.3 修改员工信息Controller

package com.cxyzxc.www.controller;


import com.cxyzxc.www.entity.Emp;
import com.cxyzxc.www.service.EmpService;
import com.cxyzxc.www.service.impl.EmpServiceImpl;

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(name = "UpdateEmpController",value = "/manager/safe/updateEmpController")
public class UpdateEmpController extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.收参
        Integer id = Integer.valueOf(request.getParameter("id"));
        String name = request.getParameter("name");
        Double salary = Double.valueOf(request.getParameter("salary"));
        Integer age = Integer.valueOf(request.getParameter("age"));

        Emp emp = new Emp(id,name,salary,age);

        EmpService empService = new EmpServiceImpl();
        empService.modify(emp);

        response.sendRedirect(request.getContextPath()+"/manager/safe/showAllEmpController");


    }

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