jsp+servlet实战项目

第一步：新建maven项目，项目中添加dao，entity，service，servlet，util包
第二步：导入依赖

第三步：数据库建表

第四步：entity实体包（疯转）

第五步：在util工具包中添加工具类

第六步：Dao包中创建Impl包，Impl包中放EmployeeDaoImpl类和UseDaoImpl类；Employee接口，UseDao接口

第七步：UseDao接口中写能实现登录和注册的方法

public Use findByUse(String username,String password)登录

public Integer register(Use use)(注册)

第八步：EmployeeDao接口写能实现增删改查的方法

public Integer addEmployee(Employee employee)

public Integer delById(Integer id)

public Integer updateEmployee(Employee employee)

public List<Employee>findall()

public Employee findbById(Integer id)

第九步：EmployeeDapImpl类（增删改查功能）

增public Integer addEmployee（Employee employee）{

return supper . executeUpdate("insert into t_emolyee(name,salary,age)value(?,?,?)",new Object[]{

employee.getName();employee.getSalary(),employee.getAge()});}

删public Integer delById(Integer　id){

return super.exectueUpdate("delete  from t_emolyee where id=?",new Objject [ ]{id});}

改public Integer updateEmployee（Employee employee）{

return super.executeUpdate("update t_emolyee set name=?,salary=?,age=? where id=? ",new Object[]{

employee.getName();employee.getSalary(),employee.getAge(),employee.getId()});}

查public List<Employee>findall(){

List<Employee>list=new ArrayList<>();

String sql="select * from t_employee"

Object [] params=null;

rs=super.ececuteQuery(sql,params)'

try catch finally

while(rs.(next)){

Employee employee=new Employee（）；

employee . setId(rs.getInt("id"))

employee . setName(rs.getString("name"))

employee.setSalary(rs.getString("salary"))

employee. setAge(rs.getInt("age"))

list.add(employee)

return list;

查对象

public Employe findById（Integer id）

Employee employee=new Employee（）；

rs=super.ExecuteQuary("select * from t_employee where id=?",new Object []{id});

try catch finally

while (rs.next()){

employee.setId(rs.getInt("id"));

employee.setName(rs.getString("name"));

employee.setSalary(rs.getString("salary"));

employee.setAge(rs.getInt("age"));}

return employee;

第十步：UseDaoImpl类（实现登录和注册）

登录（去查询数据库的数据能否和username和passworad匹配）

public Use findByUse（String username，String password）{

Use uu=null；

rs=super.executeQuary("select * from t_use where username=? and password=?",new Object[]{

username,pasword});

try catch finally

while(rs.next()){

uu=new Use()

uu.setUsername(rs.getString("username"));

uu.setRealname(rs.getString("realname"));

uu.setPaaword(rs.getString("password"));}

super.closecon

return uu;

注册（用添加方法。注册完成后，把注册的值传到数据库）

public Integer register（Use use）{

return super.executeUpdate("insert into t_use(username,realname,password)value(?,?,?)",new Object[]{

use.getUsername(),use.getRealname(),use.getPassword});}

第十一步：

service包中添加Impl包包里放EmployeeServiceImpl类和UseServiceImpl类

service包中的EmployeeServiceImpl有一个EmployeeService接口

service包中的UseServiceImpl有一个UseService接口

接口中的方法与dao接口中的方法一致

第十二步：

在servlet包中添加Servlet 类型的UseServlet类和employeeServlet类

useServlet包：

public class UseServlet extends HttpServlet {
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
UseServiceImpl usi=new UseServiceImpl();
String action=request.getParameter("action");
if (action.equals("register")){
String username = request.getParameter("username");
String realname = request.getParameter("realname");
String password = request.getParameter("password");
Use use=new Use();
use.setUsername(username);
use.setRealname(realname);
use.setPassword(password);
Integer flag = usi.register(use);
if (flag>0){
request.getRequestDispatcher("login.jsp").forward(request,response);
}
}else if (action.equals("login")){
String username=request.getParameter("username");
String password=request.getParameter("password");
Use use=usi.findByUse(username,password);
if (use!=null){
request.getRequestDispatcher("EmployeeServlet?action=employeeList").forward(request,response);
} } } }

第十二步：配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">

<servlet>
<servlet-name>EmployeeServlet</servlet-name>
<servlet-class>cn.kgc.servlet.EmployeeServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>UseServlet</servlet-name>
<servlet-class>cn.kgc.servlet.UseServlet</servlet-class>
</servlet>

因为有两个Servlet所以要写两个。上面都写各自的路径，下面都写各自的url名
<servlet-mapping>
<servlet-name>UseServlet</servlet-name>
<url-pattern>/UseServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>EmployeeServlet</servlet-name>
<url-pattern>/EmployeeServlet</url-pattern>
</servlet-mapping>

</web-app>

第十三步：

在webapp中导入css样式（样式是别人给的直接复制粘贴过来）

第十四步：建立register.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>regist</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/css/style.css" />
</head>
<body>
<div id="wrap">
<div id="top_content">
<div id="header">
<div id="rightheader">
<p>
2009/11/20
<br />
</p>
</div>
<div id="topheader">
<h1 id="title">
<a href="#">main</a>
</h1>
</div>
<div id="navigation">
</div>
</div>
<div id="content">
<p id="whereami">
</p>
<h1>
注册
</h1>
<form action="UseServlet?action=register" method="post">把在网页中获得的对象塞到servlet中的requestg中
<table cellpadding="0" cellspacing="0" border="0"
class="form_table">
<tr>
<td valign="middle" align="right">
用户名:
</td>
<td valign="middle" align="left">
<input type="text" class="inputgri" name="username" />
</td>
</tr>
<tr>
<td valign="middle" align="right">
真实姓名:
</td>
<td valign="middle" align="left">
<input type="text" class="inputgri" name="realname" />
</td>
</tr>
<tr>
<td valign="middle" align="right">
密码:
</td>
<td valign="middle" align="left">
<input type="password" class="inputgri" name="password" />
</td>
</tr>

</table>
<p>
<input type="submit" class="button" value="注册 &raquo;" />
<input type="button" class="button" value="登录 &raquo;" onclick="javascript:window.location.href='login.jsp'" />有一个跳转到登录界面的按钮
</p>
</form>
</div>
</div>
<div id="footer">
<div id="footer_bg">
ABC@126.com
</div>
</div>
</div>
</body>
</html>

第十五步 建立login . jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>login</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="<%=request.getContextPath()%>/css/style.css" />
</head>
<body>
<div id="wrap">
<div id="top_content">
<div id="header">
<div id="rightheader">
<p>
2009/11/20
<br />
</p>
</div>
<div id="topheader">
<h1 id="title">
<a href="#">main</a>
</h1>
</div>
<div id="navigation">
</div>
</div>
<div id="content">
<p id="whereami">
</p>
<h1>
登录
</h1>
<form action="UseServlet?action=login" method="post">
<table cellpadding="0" cellspacing="0" border="0"
class="form_table">
<tr>
<td valign="middle" align="right">
username:
</td>
<td valign="middle" align="left">
<input type="text" class="inputgri" name="username" />
</td>
</tr>
<tr>
<td valign="middle" align="right">
password:
</td>
<td valign="middle" align="left">
<input type="password" class="inputgri" name="password" />
</td>
</tr>
</table>
<p>
<input type="submit" class="button" value="登录 &raquo;" />
<input type="button" class="button" value="注册 &raquo;" onclick="javascript:window.location.href='register.jsp'" />
</p>
</form>
</div>
</div>
<div id="footer">
<div id="footer_bg">
ABC@126.com
</div>
</div>
</div>
</body>
</html>

第十六步：建立list.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>regist</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/css/style.css" />
</head>
<body>
<div id="wrap">
<div id="top_content">
<div id="header">
<div id="rightheader">
<p>
2009/11/20
<br />
</p>
</div>
<div id="topheader">
<h1 id="title">
<a href="#">main</a>
</h1>
</div>
<div id="navigation">
</div>
</div>
<div id="content">
<p id="whereami">
</p>
<h1>
注册
</h1>
<form action="UseServlet?action=register" method="post">
<table cellpadding="0" cellspacing="0" border="0"
class="form_table">
<tr>
<td valign="middle" align="right">
用户名:
</td>
<td valign="middle" align="left">
<input type="text" class="inputgri" name="username" />
</td>
</tr>
<tr>
<td valign="middle" align="right">
真实姓名:
</td>
<td valign="middle" align="left">
<input type="text" class="inputgri" name="realname" />
</td>
</tr>
<tr>
<td valign="middle" align="right">
密码:
</td>
<td valign="middle" align="left">
<input type="password" class="inputgri" name="password" />
</td>
</tr>

</table>
<p>
<input type="submit" class="button" value="注册 &raquo;" />
<input type="button" class="button" value="登录 &raquo;" onclick="javascript:window.location.href='login.jsp'" />
</p>
</form>
</div>
</div>
<div id="footer">
<div id="footer_bg">
ABC@126.com
</div>
</div>
</div>
</body>
</html>

第十七步.建立EmoployeeServlet类

public class EmployeeServlet extends HttpServlet {
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=utf-8");
String action=request.getParameter("action");
if (action.equals("employeeList")){
EmployeeServiceImpl esi=new EmployeeServiceImpl();
List<Employee> list = esi.findAll();
request.setAttribute("list",list);
request.getRequestDispatcher("list.jsp").forward(request,response);
}
}
}