1.新建一个java web project
注：netbean 安装时会询问是否安装tomcat，如果此处没有tomcat，就是安装时未选tomcat。
完成后
2.编写index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Murach‘s Java Servlets and JSP</title>
<link rel="stylesheet" href="main.css" type="text/css"/>//main.css是配置文件，注意路径
</head>
<body>
<h1>Join our email list</h1>
<p>To join our email list, enter your name and
email address below.</p>
<form action="EmailListServlet" method="post">
<input type="hidden" name="action" value="add">
<label>Email:</label>
<input type="email" name="email" required><br>
<label>First Name:</label>
<input type="text" name="firstName" required><br>
<label>Last Name:</label>
<input type="text" name="lastName" required><br>
<label> </label>
<input type="submit" value="Join Now" id="submit">
</form>
</body>
</html>
3.编写main.css
body {
font-family: Arial, Helvetica, sans-serif;
font-size: 11pt;
margin-left: 2em;
margin-right: 2em;
}
h1 {
color: teal;
}
label {
float: left;
width: 6em;
margin-bottom: 0.5em;
}
input[type="text"], input[type="email"] {
width: 15em;
margin-left: 0.5em;
margin-bottom: 0.5em;
}
br {
clear: both;
}
#submit {
margin-left: 0.5em; }
3.两个java文件
EmailListServlet.java 和User.java
package murach.email;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import murach.business.User;
//import murach.data.UserDB;
public class EmailListServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
String url = "/index.html";
// get current action
String action = request.getParameter("action");
if (action == null) {
action = "join"; // default action
}
// perform action and set URL to appropriate page
if (action.equals("join")) {
url = "/index.html"; // the "join" page
}
else if (action.equals("add")) {
// get parameters from the request
String firstName = request.getParameter("firstName");
String lastName = request.getParameter("lastName");
String email = request.getParameter("email");
// store data in User object and save User object in db
User user = new User(firstName, lastName, email);
// UserDB.insert(user);
// set User object in request object and set URL
request.setAttribute("user", user);
url = "/thanks.jsp"; // the "thanks" page
}
// forward request and response objects to specified URL
getServletContext()
.getRequestDispatcher(url)
.forward(request, response);
}
@Override
protected void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
}
package murach.business;
import java.io.Serializable;
public class User implements Serializable {
private String firstName;
private String lastName;
private String email;
public User() {
firstName = "";
lastName = "";
email = "";
}
public User(String firstName, String lastName, String email) {
this.firstName = firstName;
this.lastName = lastName;
this.email = email;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}
4.web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1"
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">
<servlet>
<servlet-name>EmailListServlet</servlet-name>
<servlet-class>murach.email.EmailListServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>EmailListServlet</servlet-name>//要到EmailListServlet这个java文件中去寻找
<url-pattern>/EmailListServlet</url-pattern>//需要找到EmailListServlet这个方法
</servlet-mapping>
<session-config>
<session-timeout>30</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
5.thanks.jsp
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Murach‘s Java Servlets and JSP</title>
<link rel="stylesheet" href="main.css" type="text/css"/>
</head>
<body>
<h1>Thanks for joining our email list</h1>
<p>Here is the information that you entered:</p>
<label>Email:</label>
<span>${user.email}</span><br>
<label>First Name:</label>
<span>${user.firstName}</span><br>
<label>Last Name:</label>
<span>${user.lastName}</span><br>
<p>To enter another email address, click on the Back
button in your browser or the Return button shown
below.</p>
<form action="" method="get">
<input type="hidden" name="action" value="join">
<input type="submit" value="Return">
</form>
</body>
</html>
6.文件分布如图
注：web.xml文件必须在WEB-INF这个文件夹下，不然点击submit后会报错。
7.运行结果
时间： 2024-10-25 06:16:44