mac下用Netbean下编写一个javaservlet
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
