servlet的簡單創建
一、手動創建
比較麻煩不介紹
二、通過Myeclipse創建
（1）創建項目TestServlet
（2）web.xml會自動被系統配置
<web-app version="3.0"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<!-- 通過<servlet>聲明一個servlet對象 -->
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<!-- 指定servlet的名稱爲“ServletTest” -->
<servlet-name>ServletTest</servlet-name>
<!-- “ServletTest”在哪個包中 -->
<servlet-class>servlet.ServletTest</servlet-class>
</servlet>
<!-- “mapping爲映射”映射訪問servlet的URL -->
<servlet-mapping>
<!-- 指定servlet的名稱爲“ServletTest” -->
<servlet-name>ServletTest</servlet-name>
<!-- 指定訪問URL的路徑 -->
<url-pattern>/servlet/ServletTest</url-pattern>
</servlet-mapping>
</web-app>三、一個簡單註冊程序
創建一個項目Servlet
1、創建reg.jsp提交頁面
<body>
<h1>用戶註冊</h1>
<hr>
<form name="regForm" action="servlet/RegServlet" method="post" >
<table border="0" width="800" cellspacing="0" cellpadding="0">
<tr>
<td class="lalel">用戶名：</td>
<td class="controler"><input type="text" name="username" /></td>
</tr>
<tr>
<td class="label">密碼：</td>
<td class="controler"><input type="password" name="mypassword" ></td>
</tr>
<tr>
<td class="label">確認密碼：</td>
<td class="controler"><input type="password" name="confirmpass" ></td>
</tr>
<tr>
<td class="label">電子郵箱：</td>
<td class="controler"><input type="text" name="email" ></td>
</tr>
<tr>
<td class="label">性別：</td>
<td class="controler"><input type="radio" name="gender" checked="checked" value="Male">男<input type="radio" name="gender" value="Female">女</td>
</tr>
<tr>
<td class="label">出生日期：</td>
<td class="controler">
<input name="birthday" type="text" id="control_date" size="10"
maxlength="10" onclick="new Calendar().show(this);" readonly="readonly" />
</td>
</tr>
<tr>
<td class="label">愛好：</td>
<td class="controler">
<input type="checkbox" name="favorite" value="nba"> NBA
<input type="checkbox" name="favorite" value="music"> 音樂
<input type="checkbox" name="favorite" value="movie"> 電影
<input type="checkbox" name="favorite" value="internet"> 上網
</td>
</tr>
<tr>
<td class="label">自我介紹：</td>
<td class="controler">
<textarea name="introduce" rows="10" cols="40"></textarea>
</td>
</tr>
<tr>
<td class="label">接受協議：</td>
<td class="controler">
<input type="checkbox" name="isAccept" value="true">是否接受霸王條款
</td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="submit" value="註冊"/>
<input type="reset" value="取消"/>
</td>
</tr>
</table>
</form>
</body>2、在src中創建entity包，同時創建Users類，用戶實體類
package entity;
import java.util.Date;
public class Users {
public Users(){
}
private String username;
private String mypassword;
private String email;
private String gender;
private String introduce;
private boolean flag;
private String[]favorites;
private Date birthday;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getMypassword() {
return mypassword;
}
public void setMypassword(String mypassword) {
this.mypassword = mypassword;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public String getIntroduce() {
return introduce;
}
public void setIntroduce(String introduce) {
this.introduce = introduce;
}
public boolean isFlag() {
return flag;
}
public void setFlag(boolean flag) {
this.flag = flag;
}
public String[] getFavorites() {
return favorites;
}
public void setFavorites(String[] favorites) {
this.favorites = favorites;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
}
3、在src中創建servlet包，同時創建RegServlet來處理業務邏輯
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import entity.Users;
public class RegServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public RegServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
Users users=new Users();
String username,mypassword,email,gender,introduce,flag;
String []favorites;
Date birthday;
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
try {
username=request.getParameter("username");
mypassword=request.getParameter("mypassword");
email=request.getParameter("email");
gender=request.getParameter("gender");
introduce=request.getParameter("introduce");
//判斷獲取過來的flag是否爲空
if(request.getParameterValues("flag")!=null){
flag=request.getParameter("flag");
}else {
flag="false";
}
favorites=request.getParameterValues("favorite");
birthday=sdf.parse(request.getParameter("birthday"));
users.setBirthday(birthday);
users.setEmail(email);
users.setGender(gender);
users.setFavorites(favorites);
users.setIntroduce(introduce);
users.setMypassword(mypassword);
users.setUsername(username);
//判斷flag提交的是true或者false
if(flag.equals("true")){
users.setFlag(true);
}
else {
users.setFlag(false);
}
//將users內容保存在session中
request.getSession().setAttribute("regUser", users);
//跳轉到userinfo.jsp中
request.getRequestDispatcher("../userinfo.jsp").forward(request, response);
} catch (Exception e) {
// TODO: handle exception
}
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
4、創建userinfo.jsp接收信息
<%@ page language="java" import="java.util.*,java.text.*" contentType="text/html; charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'userinfo.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<style type="text/css">
.title{
width: 30%;
background-color: #CCC;
font-weight: bold;
}
.content{
width:70%;
background-color: #CBCFE5;
}
</style>
</head>
<body>
<h1>用戶信息</h1>
<hr>
<center>
<jsp:useBean id="regUser" class="entity.Users" scope="session"/>
<table width="600" cellpadding="0" cellspacing="0" border="1">
<tr>
<td class="title">用戶名：</td>
<td class="content"> <jsp:getProperty name="regUser" property="username"/></td>
</tr>
<tr>
<td class="title">密碼：</td>
<td class="content"> <jsp:getProperty name="regUser" property="mypassword"/></td>
</tr>
<tr>
<td class="title">性別：</td>
<td class="content"> <jsp:getProperty name="regUser" property="gender"/></td>
</tr>
<tr>
<td class="title">E-mail：</td>
<td class="content"> <jsp:getProperty name="regUser" property="email"/></td>
</tr>
<tr>
<td class="title">出生日期：</td>
<td class="content">
<%
SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日");
String date = sdf.format(regUser.getBirthday());
%>
<%=date%>
</td>
</tr>
<tr>
<td class="title">愛好：</td>
<td class="content">
<%
String[] favorites = regUser.getFavorites();
for(String f:favorites)
{
%>
<%=f%>
<%
}
%>
</td>
</tr>
<tr>
<td class="title">自我介紹：</td>
<td class="content"> <jsp:getProperty name="regUser" property="introduce"/></td>
</tr>
<tr>
<td class="title">是否介紹協議：</td>
<td class="content"> <jsp:getProperty name="regUser" property="flag"/></td>
</tr>
</table>
</center>
</body>
</html>
5、web.xml配置文件
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>RegServlet</servlet-name>
<servlet-class>servlet.RegServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>RegServlet</servlet-name>
<url-pattern>/servlet/RegServlet</url-pattern>
</servlet-mapping>