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Most people do not understand the knowledge points of this article "how to achieve the Servlet registration page of JavaWeb", so the editor summarizes the following contents, detailed contents, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this "how to achieve the Servlet registration page of JavaWeb" article.

Servlet- Registration Page

Environmental preparation:

The environment used in this paper is as follows:

Software: Eclipse (2018)

Server: Tomcat 9

Add relevant code to index.jsp

Insert title here user registration login name: (may include amurz, 0-9 and underscore) password: (contains at least 6 characters) enter password again: email: (must contain @ character) gender: male and female avatar: hobby:

Sports, chat, play games.

Favorite city: [please choose] Beihai, Hainan, Chongqing, Hangzhou, Shenzhen, Chengdu

The effect is:

Login_Servlet.java code

Package onlyxiu_ceshi.com;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;/** * Servlet implementation class Login_Servlet * / @ WebServlet ("/ Login_Servlet") public class Login_Servlet extends HttpServlet {private static final long serialVersionUID = 1L / * * @ see HttpServlet#HttpServlet () * / public Login_Servlet () {super () / / TODO Auto-generated constructor stub} / * @ see HttpServlet#doGet (HttpServletRequest request, HttpServletResponse response) * / protected void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {/ / TODO Auto-generated method stub// response.getWriter () .append ("Served at:") .append (request.getContextPath ()) Request.setCharacterEncoding ("UTF-8"); / deal with garbled response.setCharacterEncoding ("UTF-8"); / / deal with garbled / / get the data submitted by the user in the register interface String username = request.getParameter ("username") String password = request.getParameter ("password"); String confirmPassword = request.getParameter ("confirmPassword"); String gender = request.getParameter ("gender"); String youxaing = request.getParameter ("youxaing"); String bfile = request.getParameter ("bfile"); String hobby = request.getParameter ("hobby") String selectList = request.getParameter ("selectList"); / / determine whether the password is correct if (password.equals (confirmPassword)) {/ / if the password is the same, redirect to the successful interface HttpSession session = request.getSession (); / / get session session.setAttribute ("session_username", username) Session.setAttribute ("session_password", password); session.setAttribute ("session_gender", gender); session.setAttribute ("session_youxaing", youxaing); session.setAttribute ("session_bfile", bfile); session.setAttribute ("session_hobby", hobby) Session.setAttribute ("session_selectList", selectList); request.getRequestDispatcher ("SuccessServlet") .forward (request, response); / / response.sendRedirect ("register_login.jsp") / / Redirect to the success page} else {/ / if the password is different, notify the user that the password input is different request.getSession () .setAttribute ("passwordError", "yes"); request.getRequestDispatcher ("ErrorServlet") .forward (request, response); / / response.sendRedirect ("register.jsp") / / Redirect to login interface}} / * * @ see HttpServlet#doPost (HttpServletRequest request, HttpServletResponse response) * / protected void doPost (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {/ / TODO Auto-generated method stub doGet (request, response);}}

Configure web.xml

Onlyxiu_ceshi index.html index.htm index.jsp default.html default.htm default.jsp Login_Servlet onlyxiu_ceshi.com Login_Servlet / onlyxiu_ceshi/Login_Servlet

The code for ErrorServlet.java

Package onlyxiu_ceshi.com;import java.io.IOException;import java.io.PrintWriter;import java.util.Arrays;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;/** * Servlet implementation class ErrorServlet * / @ WebServlet ("/ ErrorServlet") public class ErrorServlet extends HttpServlet {private static final long serialVersionUID = 1L / * * @ see HttpServlet#HttpServlet () * / public ErrorServlet () {super () / / TODO Auto-generated constructor stub} / * @ see HttpServlet#doGet (HttpServletRequest request, HttpServletResponse response) * / protected void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {/ / TODO Auto-generated method stub// response.getWriter () .append ("Served at:") .append (request.getContextPath ()) Response.setHeader ("Content-type", "text/html; charset=UTF-8"); String username = request.getParameter ("username"); String password = request.getParameter ("password"); String gender = request.getParameter ("gender"); String youxaing = request.getParameter ("youxaing") String bfile = request.getParameter ("bfile"); String hobby = request.getParameter ("hobby"); String selectList = request.getParameter ("selectList"); PrintWriter out = response.getWriter (); out.print ("user Registration Information"); out.print ("user name:\ n" + username+ "

); out.print ("password:" + password+ "

"); out.print (" email: "+ youxaing+"

"); out.print (" gender: "+ gender+"

); out.print ("profile picture:" + bfile+ "

Out.print ("hobbies:" + hobby+ "

); out.print ("favorite city:" + selectList+ "

"); / / out.print (" login failed "); out.close ();} / * * @ see HttpServlet#doPost (HttpServletRequest request, HttpServletResponse response) * / protected void doPost (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {/ / TODO Auto-generated method stub// doGet (request, response) }}

SuccessServlet.java

Package onlyxiu_ceshi.com;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;/** * Servlet implementation class SuccessServlet * / @ WebServlet ("/ SuccessServlet") public class SuccessServlet extends HttpServlet {private static final long serialVersionUID = 1L / * * @ see HttpServlet#HttpServlet () * / public SuccessServlet () {super () / / TODO Auto-generated constructor stub} / * @ see HttpServlet#doGet (HttpServletRequest request, HttpServletResponse response) * / protected void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {/ / TODO Auto-generated method stub// response.getWriter () .append ("Served at:") .append (request.getContextPath ()) Response.setHeader ("Content-type", "text/html; charset=UTF-8"); String username = request.getParameter ("username"); String password = request.getParameter ("password"); String gender = request.getParameter ("gender"); String youxaing = request.getParameter ("youxaing"); String bfile = request.getParameter ("bfile") String hobby = request.getParameter ("hobby"); String selectList = request.getParameter ("selectList"); PrintWriter out = response.getWriter (); out.print ("user Registration Information"); out.print ("user name:\ n" + username+ "

); out.print ("password:" + password+ "

"); out.print (" email: "+ youxaing+"

"); out.print (" gender: "+ gender+"

); out.print ("profile picture:" + bfile+ "

Out.print ("hobbies:" + hobby+ "

); out.print ("favorite city:" + selectList+ "

"); / / out.println (" login succeeded "); out.close ();} / * * @ see HttpServlet#doPost (HttpServletRequest request, HttpServletResponse response) * / protected void doPost (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {/ / TODO Auto-generated method stub// doGet (request, response) }}

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