1, first of all, although very simple, but for beginners this JSP and servlet link I've been tinkering with a half a day to figure out
The JSP submits the request to a URL, and the servlet gets the requested data from the URL, and the link is at that URL
Code in a JSP
File name: login.jsp
<%@ page language= "java" contenttype= "text/html; Charset=utf-8 "
pageencoding= "Utf-8"%>
<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<meta http-equiv= "Content-type" content= "text/html; charset=gb2312 "/>
<title> Login </title>
<body>
<form action= "http://localhost:80/loginServlet/LoginServlet" method= "POST" >
User: <input type= "text" name= "username" value= "wangmin"/><br/>
Password: <input type= "password" name= "password" value= "Wangmin"/><br/>
<input type= "Submit" value= "Login"/>
</form> AAAA
</body>
Code in a servlet
File name: Loginservlet.java
Package my.experience.login;
Import java.io.IOException;
Import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;
Import Javax.servlet.http.HttpServletResponse;
public class Loginservlet extends httpservlet{
Overriding the Doget method
public void doget (HttpServletRequest request,
HttpServletResponse response)
Throws Servletexception,
IOException {
String username = request.getparameter ("username");
String Password = request.getparameter ("password");
Server-side printing information
System.out.println ("username=" + username);
System.out.println ("password=" + password);
Set the encoding format
Response.setcontenttype ("text/html;charset=gb18030");
Return to HTML page
Response.getwriter (). println ("
Response.getwriter (). println ("
Response.getwriter (). println ("<title> login Information </title>");
Response.getwriter (). println ("
Response.getwriter (). println ("<body>");
Response.getwriter (). println ("Welcome" "+ Username +" "User Login successful!!!" ");
Response.getwriter (). println ("</body>");
Response.getwriter (). println ("
}
Overriding the Dopost method
public void DoPost (HttpServletRequest request,
HttpServletResponse response)
Throws Servletexception,
IOException {
Doget (request, response);
}
}
Be sure to write the URL in Web. XML, otherwise you won't find
<?xml version= "1.0" encoding= "UTF-8"?>
<web-app xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance" xmlns= "Http://java.sun.com/xml/ns/javaee" xmlns : web= "http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemalocation= "Http://java.sun.com/xml/ns/javaee Http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd "id=" webapp_id "version=" 2.5 ">
<display-name>MyExperience</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>my.experience.login.loginservlet</servlet-class>//Package name + class name
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/loginServlet/LoginServlet</url-pattern> action in the corresponding JSP
</servlet-mapping>
</web-app>
Then Kai Tomacat, enter http://localhost:80/login.jsp in the browser OK
This article is from the "AutoComplete" blog, make sure to keep this source http://7129486.blog.51cto.com/7119486/1595806
JSP and servlet Simple login interface (no database attached)
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